SSC Computer Complete Batch Networking PPT Slides (LEC #6)

In this article we will share SSC Computer Complete Batch Networking PPT Slides (LEC #6) So, in today’s digital world, computer networking is no longer a specialist subject. It is everyday knowledge. When you connect to Wi-Fi, send a WhatsApp message, access a government portal, or use internet banking, you are using computer networking concepts in real life. This is exactly why the SSC Commission has made networking a core component of Computer Awareness across all its major exams.

Lecture 6 (LEC 6) of the Complete Foundation Batch for All SSC Exams PPT Series is dedicated entirely to Networking (नेटवर्किंग). With 177 comprehensive PPT slides covering all 10 classes on computer networking, this module is one of the most practically relevant and exam-rich chapters in the entire series.

Whether you are searching for computer networking notes for (Staff Selection Commission) SSC, types of computer networks, network topology in computer networks, OSI model layers, network devices list, IP address and DNS explanation, or a free networking notes PDF for competitive exams, this article and the downloadable PPT cover every single concept you need. Let us start from the foundation.

Detail	Information
Subject	Networking (नेटवर्किंग)
Lecture Number	LEC 6
Total Slides	177 PPT Slides
File Size	80 MB
Series Name	Complete Foundation Batch for All SSC Exams (PPT Series)
Serial Number	#06
Best For	SSC CGL, CHSL, MTS, GD, CPO, JE and all competitive exams
Language	English + Hindi (Bilingual)
Format	PPT / PDF
Website	https://slideshareppt.net/

SSC Computer Complete Batch Networking PPT Slides (LEC #6)

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Computer Network Kya Hai? Definition and Basic Concept

A computer network is a system in which two or more computers (or other digital devices) are connected together to share data, resources, and information. The connection can be through physical cables, wireless signals, or a combination of both.

The primary purpose of a computer network is resource sharing. Instead of each computer having its own printer, internet connection, or file storage, networked computers can share these resources efficiently. This reduces cost, increases collaboration, and enables communication on a massive scale.

In Hindi, computer network is called Sanganak Jaal (संगणक जाल) or simply Computer Network (कंप्यूटर नेटवर्क). The bilingual SSC papers use both terms.

Aspect	Detail
Definition	Two or more computers connected to share data and resources
Hindi Name	कंप्यूटर नेटवर्क / संगणक जाल (Networking = नेटवर्किंग)
Key Purpose	Data sharing, resource sharing, communication, centralized management
Minimum Requirement	At least 2 computers and a communication medium (cable or wireless)
Communication Medium	Wired (Ethernet, Fiber Optic, Coaxial Cable) or Wireless (Wi-Fi, Bluetooth, Satellite)
Managed By	Network Administrator using specialized network hardware and software
Examples	Internet, Intranet, office LAN, mobile data network, ATM banking network

Types of Computer Networks: LAN, WAN, MAN, PAN, and More

The classification of computer networks based on their geographic coverage is one of the most frequently tested topics in SSC Computer Awareness. Every SSC exam has at least one question from this section. You must know all network types, their full forms, coverage ranges, and examples.

Network Type	Full Form	Geographic Coverage	Speed	Examples
PAN	Personal Area Network	Very short range; within a few meters around a person	High (within range)	Bluetooth between phone and earbuds, USB connection between PC and phone
LAN	Local Area Network	Limited area: single building, floor, office, or campus	Very High (100 Mbps to 10 Gbps)	Office network, school computer lab, home Wi-Fi network
MAN	Metropolitan Area Network	City or town level; spans several kilometers	High (up to Gbps)	City-wide cable TV network, municipal Wi-Fi, university across multiple campuses
WAN	Wide Area Network	Country, continent, or global level	Variable (slower than LAN due to distance)	The Internet itself; bank ATM networks across India; SWIFT financial network
CAN	Campus Area Network	A university or large corporate campus	High	IIT campus network, corporate headquarters network
SAN	Storage Area Network	Specialized network for storage devices in data centers	Very High	Enterprise data centers connecting servers to storage arrays
VPN	Virtual Private Network	Extends a private network over a public network (Internet)	Depends on internet speed	Remote employee access to company servers; secure browsing tools
Internet	Interconnected Networks	Global – the entire world	Variable	WWW (World Wide Web), email, cloud services, streaming

LAN vs MAN vs WAN: Key Differences (Most Tested SSC Table)

Feature	LAN	MAN	WAN
Full Form	Local Area Network	Metropolitan Area Network	Wide Area Network
Coverage	Single building or campus	City or town (few to 50 km)	Country, continent, or global
Speed	Very High (up to 10 Gbps)	High (up to 1 Gbps)	Slower (variable, depends on link)
Ownership	Usually privately owned	May be public or private	Often owned by telecom providers
Setup Cost	Low	Medium	High
Maintenance	Easy	Moderate	Complex
Example	Office LAN, school lab	City broadband network	The Internet, satellite WAN
Technology Used	Ethernet, Wi-Fi	Fiber optic, WiMAX	MPLS, fiber, satellite, DSL

Network Topology: Types and Diagrams Explained

Network topology refers to the physical or logical arrangement of computers and other devices in a network. It describes how nodes (computers, printers, servers) are connected to each other and the communication medium. Topology is a consistently tested concept in SSC Computer Awareness papers.

Topology	Shape / Layout	Advantages	Disadvantages	Best Used In
Bus Topology	All devices connected to a single central cable (backbone)	Simple, cheap, easy to set up; requires less cable	Single point of failure (if backbone fails, entire network fails); slow with many devices	Small, temporary, or low-cost networks
Star Topology	All devices connected to a central hub or switch	Easy to add/remove devices; failure of one device does not affect others; easy to troubleshoot	Central hub is a single point of failure; more cable required than bus	Most modern office and home networks
Ring Topology	Each device connected to exactly two others, forming a closed ring loop	Data travels in one direction (orderly); no data collisions	Single break in ring disrupts entire network; difficult to add/remove devices	Token Ring networks, some LAN setups
Mesh Topology	Every device connected to every other device	Highly reliable; multiple paths for data; no single point of failure	Very expensive; complex wiring; difficult to manage	Military networks, critical infrastructure, internet backbone
Tree Topology	Hierarchical; combines star and bus topology; parent-child node structure	Easy to manage hierarchically; scalable	Depends on root node; complex wiring	Large organizations, campus networks
Hybrid Topology	Combination of two or more different topologies	Flexible; scalable; can take best features of each topology	Complex design; expensive to implement	Large enterprise networks, modern internet architecture

Network Devices: Complete List with Functions

Network devices (also called networking hardware) are the physical components that connect computers and other devices in a network and manage data transmission between them. Knowing each device’s name, function, and how it differs from similar devices is a very common SSC exam question pattern.

Network Device	Function	OSI Layer	Key Point for SSC
Hub	Broadcasts data to all connected devices; does not filter or direct	Physical Layer (Layer 1)	Dumb device; sends data to everyone; creates collisions; now largely replaced by switches
Switch	Forwards data only to the specific destination device using MAC addresses	Data Link Layer (Layer 2)	Smarter than hub; reduces collisions; most common LAN device in offices
Router	Connects different networks; routes data packets between networks using IP addresses	Network Layer (Layer 3)	Connects LAN to the Internet; uses IP routing tables; most important network device for homes/offices
Modem	Converts digital computer signals to analog for transmission over telephone lines and vice versa	Physical Layer (Layer 1)	MOdulator-DEModulator; needed for DSL and cable internet connections
Bridge	Connects two similar network segments; filters traffic by MAC address	Data Link Layer (Layer 2)	Smarter than hub; divides network into segments to reduce collision domain
Repeater	Amplifies and regenerates network signals over long distances to prevent signal loss	Physical Layer (Layer 1)	Boosts weak signals; used in long cable runs; no intelligence, just signal amplification
Gateway	Connects networks with different protocols; translates between them	All Layers (Application to Physical)	Translates protocols; acts as entry/exit point between completely different networks
Network Interface Card (NIC)	Connects a computer to a network; provides a hardware address (MAC address)	Data Link Layer (Layer 2)	Every networked device has a NIC; MAC address is burned into NIC at manufacturing
Access Point (AP)	Provides wireless network access; connects wireless devices to a wired LAN	Data Link Layer (Layer 2)	Creates a Wi-Fi hotspot; extends wireless coverage; often built into routers
Firewall	Monitors and controls network traffic based on security rules	Network/Transport Layer	Blocks unauthorized access; first line of defense in network security; can be hardware or software

OSI Model: 7 Layers of Networking – Critical for SSC CGL

The OSI (Open Systems Interconnection) model is the most important theoretical framework in computer networking and one of the most tested topics in SSC CGL and SSC JE Computer Science papers. The OSI model describes how data communication happens between computers across a network by dividing the process into 7 distinct layers, each with a specific role.

Understanding the OSI model not only helps you answer direct questions about its layers but also gives you a framework for understanding every other networking concept, from protocols to devices to troubleshooting.

Layer No.	Layer Name	Mnemonic Word	Primary Function	Protocols / Examples
Layer 7	Application Layer	Away	Provides network services directly to user applications; handles user interface for network communication	HTTP, HTTPS, FTP, SMTP, POP3, IMAP, DNS, Telnet, SSH
Layer 6	Presentation Layer	Pizza	Translates data format; handles data encoding, encryption, compression, and conversion	SSL/TLS (encryption), JPEG, MPEG, ASCII, Unicode, GIF
Layer 5	Session Layer	Sausage	Establishes, manages, and terminates communication sessions between applications	NetBIOS, RPC (Remote Procedure Call), PPTP
Layer 4	Transport Layer	Throw	Ensures reliable or fast data delivery; handles segmentation, reassembly, flow control, and error control	TCP (reliable), UDP (fast but unreliable)
Layer 3	Network Layer	Not	Routes data packets between different networks; handles logical addressing (IP addresses)	IP (IPv4, IPv6), ICMP, ARP, OSPF, BGP
Layer 2	Data Link Layer	Do	Handles node-to-node data transfer within the same network; manages MAC addresses and framing	Ethernet, Wi-Fi (IEEE 802.11), PPP, MAC addressing
Layer 1	Physical Layer	Please	Transmits raw bits (0s and 1s) over the physical medium; defines cables, signals, and connectors	Ethernet cables, fiber optic, USB, Bluetooth signals, Wi-Fi radio waves

Memory Trick for OSI Layers (from Layer 7 to Layer 1): ‘All People Seem To Need Data Processing’ – Application, Presentation, Session, Transport, Network, Data Link, Physical.

Memory Trick from Layer 1 to Layer 7: ‘Please Do Not Throw Sausage Pizza Away’ – Physical, Data Link, Network, Transport, Session, Presentation, Application.

TCP/IP Model: The Practical Internet Model

While the OSI model is the theoretical reference model for networking, the TCP/IP model is the actual model used in the internet and all real-world networks. The TCP/IP model has 4 layers that correspond to the 7 layers of the OSI model. SSC exams ask about both models and their comparison.

TCP/IP Layer	Corresponding OSI Layers	Function	Protocols
Application Layer	OSI Layers 5, 6, 7 (Session + Presentation + Application)	Handles all application-level communication and user services	HTTP, HTTPS, FTP, SMTP, POP3, IMAP, DNS, Telnet, SSH, SNMP
Transport Layer	OSI Layer 4 (Transport)	Provides end-to-end data delivery; manages reliability and flow control	TCP (Transmission Control Protocol), UDP (User Datagram Protocol)
Internet Layer	OSI Layer 3 (Network)	Handles logical IP addressing and routing of packets across networks	IP (IPv4/IPv6), ICMP, ARP, RARP, OSPF, BGP
Network Access Layer	OSI Layers 1 and 2 (Physical + Data Link)	Manages physical transmission of data over the network medium	Ethernet, Wi-Fi, PPP, Frame Relay, MAC addressing

Important Network Protocols: Full Forms and Functions for SSC

Network protocols are the set of rules and conventions that govern how data is transmitted and received across a network. Knowing protocol full forms and their functions is extremely important for SSC Computer Awareness. Questions like ‘HTTP full form’, ‘FTP kya hai’, ‘DNS kya hota hai’ appear regularly.

Protocol	Full Form	Function / Use	Port Number
HTTP	HyperText Transfer Protocol	Used for transferring web pages from web servers to browsers; basis of the World Wide Web	Port 80
HTTPS	HyperText Transfer Protocol Secure	Encrypted version of HTTP; uses SSL/TLS; secure web browsing; used for banking and login pages	Port 443
FTP	File Transfer Protocol	Used for transferring files between computers over a network	Port 21 (control), Port 20 (data)
SFTP	Secure File Transfer Protocol	Encrypted version of FTP; secure file transfer	Port 22
SMTP	Simple Mail Transfer Protocol	Used for sending email messages from a client to a server or between servers	Port 25 / 587
POP3	Post Office Protocol Version 3	Used for receiving email; downloads emails to client device; emails removed from server	Port 110
IMAP	Internet Message Access Protocol	Used for receiving email; emails stay on server; accessible from multiple devices	Port 143
DNS	Domain Name System	Translates domain names (google.com) into IP addresses (142.250.195.46)	Port 53
DHCP	Dynamic Host Configuration Protocol	Automatically assigns IP addresses to devices on a network	Port 67/68
TCP	Transmission Control Protocol	Reliable, connection-oriented data transmission; ensures all packets arrive correctly	–
UDP	User Datagram Protocol	Fast, connectionless data transmission; no delivery guarantee; used for streaming, gaming	–
IP	Internet Protocol	Routes data packets between networks using logical IP addresses	–
ARP	Address Resolution Protocol	Resolves IP addresses to MAC addresses within a local network	–
ICMP	Internet Control Message Protocol	Used for error reporting and network diagnostics; used by the ‘ping’ command	–
SSH	Secure Shell	Encrypted remote login and command execution on servers	Port 22
Telnet	Teletype Network	Remote login protocol; unencrypted; older and insecure (replaced by SSH)	Port 23
SNMP	Simple Network Management Protocol	Used for monitoring and managing network devices remotely	Port 161/162
NTP	Network Time Protocol	Synchronizes clocks of computers across a network	Port 123

IP Address: IPv4 vs IPv6, Classes, and Subnetting Basics

An IP address (Internet Protocol address) is a unique numerical label assigned to every device connected to a network that uses the Internet Protocol for communication. It serves two main functions: identifying the device (host) and providing the location of the device in the network so data can be routed to it correctly.

IPv4 vs IPv6: Key Differences

Feature	IPv4	IPv6
Full Form	Internet Protocol Version 4	Internet Protocol Version 6
Address Format	32-bit address in dotted decimal: 192.168.1.1	128-bit address in hexadecimal: 2001:0db8:85a3::8a2e:0370:7334
Total Addresses	Approximately 4.3 billion (2^32)	Approximately 340 undecillion (2^128) – virtually unlimited
Address Exhaustion	Nearly exhausted globally	Designed to solve IPv4 address shortage
Example Address	192.168.0.1, 10.0.0.1	2001:db8::1, fe80::1
Header Complexity	Simpler (20 bytes)	More complex (40 bytes fixed header)
Security	Optional (IPSec optional)	IPSec mandatory (built-in security)
Current Status	Still widely used	Gradual global adoption ongoing

IPv4 Address Classes: Important for SSC Exams

Class	Range (First Octet)	Default Subnet Mask	Used For	Example
Class A	1 to 126	255.0.0.0	Very large networks (millions of hosts per network)	10.0.0.1 (private), 65.0.0.1 (public)
Class B	128 to 191	255.255.0.0	Medium-sized networks (up to 65,534 hosts)	172.16.0.1 (private), 130.5.0.1 (public)
Class C	192 to 223	255.255.255.0	Small networks (up to 254 hosts per network)	192.168.1.1 (most common home/office IP)
Class D	224 to 239	N/A (no subnet mask)	Multicasting (sending to multiple specific devices)	224.0.0.1 (All Hosts multicast)
Class E	240 to 255	N/A	Reserved for experimental and research purposes	Not used in public networks

DNS: Domain Name System – How the Internet Finds Websites

DNS stands for Domain Name System. It is often called the phone book of the internet. Every website on the internet has an IP address (like 142.250.195.46), but humans cannot easily remember numerical IP addresses. Instead, we remember domain names like google.com or sbi.co.in.

DNS is the system that automatically translates these human-friendly domain names into their corresponding IP addresses so that browsers and applications can find and connect to the correct server on the internet.

DNS Component	Function
DNS Resolver	Your computer or router’s first step; asks DNS servers for the IP of a domain
Root Name Server	The top level of DNS hierarchy; knows which servers manage top-level domains (.com, .in, .org)
TLD (Top Level Domain) Server	Manages domains like .com, .net, .org, .in, .gov
Authoritative Name Server	Has the final answer; holds the actual IP address for a specific domain
DNS Cache	Temporarily stores recent DNS lookups to speed up repeated visits to the same site
Hosts File	A local file on your computer that can manually map domain names to IP addresses (overrides DNS)

Internet Concepts: WWW, URL, Domain, Browser, and More

The internet chapter within networking is extremely rich with exam questions. Every term from URL to ISP to bandwidth has appeared in SSC papers. Here is a comprehensive reference:

Term	Full Form	Definition / Explanation
Internet	Interconnected Networks	Global network of billions of computers and devices connected via standardized protocols (TCP/IP)
Intranet	Internal Network	A private network within an organization accessible only to its employees
Extranet	Extended Intranet	A controlled private network that allows external partners (vendors, clients) limited access to an organization’s intranet
WWW	World Wide Web	A system of interlinked hypertext documents accessed over the internet; one application of the internet
URL	Uniform Resource Locator	The complete address of a resource on the internet; e.g., https://www.google.com/search
URI	Uniform Resource Identifier	Broader identifier for any resource; URL is a type of URI
Domain Name	–	Human-readable address of a website; e.g., google.com, indianrailways.gov.in
IP Address	Internet Protocol Address	Unique numerical address identifying every device on a network
ISP	Internet Service Provider	Company that provides internet access to homes and businesses; e.g., Jio, Airtel, BSNL
Browser	Web Browser	Software used to access and display web pages; e.g., Chrome, Firefox, Safari, Edge
HTML	HyperText Markup Language	Language used to create and structure web pages
HTTP	HyperText Transfer Protocol	Protocol used to transfer web pages from server to browser
HTTPS	HyperText Transfer Protocol Secure	Encrypted (secure) version of HTTP; uses SSL/TLS encryption
Bandwidth	–	Maximum data transfer rate of a network; measured in Mbps or Gbps
Latency	–	Time delay between sending and receiving data; lower latency = faster network response
Broadband	–	High-speed internet connection; always-on; faster than traditional dial-up
Wi-Fi	Wireless Fidelity	Wireless networking technology using radio waves for internet connectivity
Search Engine	–	Web tool for finding information on the internet; e.g., Google, Bing, DuckDuckGo, Yahoo
Web Server	–	Computer that stores and serves web pages to browsers upon request
Cloud Computing	–	Delivering computing services over the internet; storage, servers, databases, software on demand

Wireless Networking Technologies: Wi-Fi, Bluetooth, and More

Wireless networking is one of the most relevant modern topics in computer networking for SSC exams. Every government office, public space, and household now uses wireless technology, making these concepts part of general digital literacy:

Technology	Full Form	Range	Speed	Use Case
Wi-Fi	Wireless Fidelity (IEEE 802.11)	Up to 100 meters (indoors)	Up to several Gbps (Wi-Fi 6)	Home and office internet; wireless LAN
Bluetooth	–	Up to 10 meters (Class 2)	Up to 3 Mbps (Classic), 24 Mbps (BT 4.0)	Connecting phones to earbuds, keyboards, mice, speakers
3G	Third Generation Mobile Network	Wide (cellular coverage)	Up to 7.2 Mbps	Mobile internet on older smartphones
4G / LTE	Fourth Generation / Long-Term Evolution	Wide (cellular coverage)	Up to 150 Mbps (typical: 10-50 Mbps)	Mobile internet, video calls, streaming on smartphones
5G	Fifth Generation Mobile Network	Shorter range; more towers needed	Up to 10 Gbps	Ultra-fast mobile internet, IoT, autonomous vehicles
NFC	Near Field Communication	Very short: up to 4 cm	424 Kbps	Contactless payments (Google Pay, PhonePe), access cards
Infrared (IR)	Infrared Communication	Very short: up to 1 meter (line of sight)	Up to 4 Mbps	TV remotes, old phone data transfer
Satellite Internet	–	Global coverage	Variable (high latency)	Remote areas without cable; aviation internet; GPS
WiMAX	Worldwide Interoperability for Microwave Access	Up to 50 km	Up to 75 Mbps	Last-mile broadband in rural areas; MAN-level wireless

Network Security: Firewall, VPN, Encryption, and Cyber Threats

Network security is a growing section within SSC Computer Awareness, especially as cybersecurity awareness becomes a national priority. Here are the key concepts:

Security Concept	Definition	How It Protects
Firewall	Hardware or software that monitors and filters network traffic based on predefined security rules	Blocks unauthorized access; prevents hackers from entering a private network; can be hardware or software
VPN	Virtual Private Network; creates an encrypted tunnel over the public internet for secure communication	Protects data privacy; allows remote workers to securely access company networks; hides IP address
Encryption	Process of converting readable data (plaintext) into unreadable code (ciphertext) using an algorithm	Protects data in transit and at rest; only authorized parties with the key can decrypt and read the data
SSL/TLS	Secure Sockets Layer / Transport Layer Security; cryptographic protocol for secure internet communication	Secures HTTPS websites, email, and VPNs; SSL is older, TLS is the modern version
DDoS Attack	Distributed Denial of Service; floods a server with requests from many compromised computers simultaneously	Attack type that overwhelms servers making them unavailable to legitimate users
Phishing	Fraudulent attempt to steal sensitive data by impersonating a legitimate entity in email or web pages	Defense: two-factor authentication, checking URLs, security awareness training
Proxy Server	Intermediary server that sits between a user’s device and the internet; forwards requests on behalf of users	Provides anonymity, content filtering, caching for faster access, security layer
IDS/IPS	Intrusion Detection System / Intrusion Prevention System; monitors network for suspicious activity	IDS detects and alerts; IPS detects and actively blocks intrusions in real time

Transmission Media: Guided and Unguided Media

Transmission media is the physical or wireless medium through which data signals travel from one device to another in a network. SSC exams ask about types of cables and their characteristics:

Media Type	Category	Medium	Speed	Advantages	Disadvantages
Twisted Pair Cable	Guided (Wired)	Two insulated copper wires twisted together; UTP and STP types	Up to 10 Gbps (Cat6A+)	Cheap, flexible, easy to install; most common in LANs	Susceptible to electromagnetic interference; limited distance
Coaxial Cable	Guided (Wired)	Central copper conductor with insulation and outer braid shield	Up to 10 Gbps	Better interference resistance than twisted pair; used in older LANs and cable TV	Thicker, less flexible; more expensive than twisted pair
Fiber Optic Cable	Guided (Wired)	Glass or plastic fibers; transmits data as light pulses	Up to 100 Tbps (theoretical)	Extremely fast; immune to electromagnetic interference; long distances; secure	Expensive; fragile; complex installation and splicing
Radio Waves	Unguided (Wireless)	Radio frequency electromagnetic waves; omnidirectional	Varies by frequency	Passes through walls; no line of sight needed; Wi-Fi, mobile networks	Interference; security concerns; speed limited by spectrum
Microwaves	Unguided (Wireless)	High-frequency electromagnetic waves; line of sight required	Up to several Gbps	Long-distance communication; used by telecom towers	Requires line of sight; affected by weather; towers needed every 40-50 km
Infrared	Unguided (Wireless)	Infrared light waves; very short range	Up to 4 Mbps	Low cost; secure (cannot penetrate walls)	Very short range; requires direct line of sight; affected by sunlight
Satellite	Unguided (Wireless)	Microwave signals bounced off satellites in orbit	Up to 1 Gbps (LEO)	Global coverage including remote areas	High latency; expensive; affected by weather conditions

Networking Abbreviations: Complete Reference for SSC Exams

Abbreviation	Full Form	Context
LAN	Local Area Network	Small area network (building/campus)
WAN	Wide Area Network	Large area network (country/global)
MAN	Metropolitan Area Network	City-level network
PAN	Personal Area Network	Personal device range network
VPN	Virtual Private Network	Secure tunnel over public internet
TCP	Transmission Control Protocol	Reliable connection-oriented protocol
UDP	User Datagram Protocol	Fast connectionless protocol
IP	Internet Protocol	Routing packets using logical addresses
HTTP	HyperText Transfer Protocol	Web page transfer protocol (Port 80)
HTTPS	HyperText Transfer Protocol Secure	Encrypted web protocol (Port 443)
FTP	File Transfer Protocol	File transfer over network (Port 21)
SMTP	Simple Mail Transfer Protocol	Sending emails (Port 25/587)
POP3	Post Office Protocol Version 3	Downloading emails (Port 110)
IMAP	Internet Message Access Protocol	Email on server access (Port 143)
DNS	Domain Name System	Domain to IP translation (Port 53)
DHCP	Dynamic Host Configuration Protocol	Automatic IP assignment (Port 67/68)
ARP	Address Resolution Protocol	IP to MAC address resolution
ICMP	Internet Control Message Protocol	Network diagnostics; used by ping
SSH	Secure Shell	Encrypted remote access (Port 22)
MAC	Media Access Control	Unique hardware address of NIC
NIC	Network Interface Card	Hardware connecting device to network
OSI	Open Systems Interconnection	7-layer theoretical networking model
ISP	Internet Service Provider	Company providing internet access
WWW	World Wide Web	Web pages system over the internet
URL	Uniform Resource Locator	Complete web address of a resource
ISP	Internet Service Provider	Jio, Airtel, BSNL in India
SSL	Secure Sockets Layer	Encryption protocol (older; replaced by TLS)
TLS	Transport Layer Security	Modern encryption protocol for HTTPS
NFC	Near Field Communication	Short-range wireless; contactless payments
WiMAX	Worldwide Interoperability for Microwave Access	Long-range wireless broadband

Networking Topics: Exam Frequency and Priority for SSC

Networking Topic	Exam Frequency	Difficulty	Priority
Types of Networks (LAN, WAN, MAN, PAN)	Very High	Easy	Must Study First
Network Devices (Hub, Switch, Router, Modem)	Very High	Easy-Medium	Must Study First
Protocol Full Forms (HTTP, FTP, SMTP, DNS)	Very High	Easy	Must Study First
IP Address Definition and Types (IPv4/IPv6)	Very High	Medium	Must Study First
DNS Full Form and Function	Very High	Easy	Must Study First
Network Topologies (Bus, Star, Ring, Mesh)	High	Medium	Must Study First
OSI Model – 7 Layers and Functions	High	Medium-Hard	Important
TCP vs UDP Difference	High	Medium	Important
Internet vs Intranet vs Extranet	High	Easy	Important
WWW, URL, Browser, ISP Concepts	High	Easy	Important
Wi-Fi, Bluetooth, NFC Wireless Technologies	High	Easy	Important
Firewall and VPN Concepts	Medium-High	Easy-Medium	Important
Transmission Media (Twisted Pair, Fiber Optic)	Medium-High	Medium	Important
TCP/IP Model vs OSI Model	Medium	Hard	Good to Know (CGL, JE)
IPv4 Address Classes (A, B, C, D, E)	Medium	Medium-Hard	Good to Know
Network Security (DDoS, Phishing, SSL/TLS)	Medium	Medium	Good to Know
5G and WiMAX Concepts	Low-Medium	Easy	Revision Only

Top 35 Networking Facts to Memorize for SSC Computer Awareness

• A computer network is two or more computers connected to share data and resources
• LAN (Local Area Network) covers a small area like a building or campus
• WAN (Wide Area Network) covers a large area; the Internet itself is the largest WAN
• MAN (Metropolitan Area Network) covers a city or town
• PAN (Personal Area Network) covers a very short personal range; Bluetooth is a PAN technology
• A Hub broadcasts data to all connected devices; a Switch sends data only to the destination device
• A Router connects different networks and routes data between them using IP addresses
• A Modem converts digital signals to analog and back; MOdulator-DEModulator
• A Repeater amplifies and regenerates weak network signals over long distances
• A Gateway connects networks with completely different protocols
• NIC stands for Network Interface Card; every networked device has one; NIC has a unique MAC address
• OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, Application
• Memory trick (bottom to top): Please Do Not Throw Sausage Pizza Away
• TCP/IP model has 4 layers: Network Access, Internet, Transport, Application
• TCP is reliable and connection-oriented; UDP is fast and connectionless
• HTTP works on Port 80; HTTPS works on Port 443; FTP works on Port 21
• SMTP (Port 25) is for sending email; POP3 (Port 110) downloads email; IMAP (Port 143) keeps email on server
• DNS translates domain names (google.com) into IP addresses
• DHCP automatically assigns IP addresses to devices on a network
• IPv4 uses 32-bit addresses (about 4.3 billion total); IPv6 uses 128-bit addresses (virtually unlimited)
• The most common Class C IP address range starts with 192.168.x.x (used in home networks)
• Bus topology has a single backbone cable; if it fails, the whole network fails
• Star topology uses a central hub/switch; most common in modern offices
• Mesh topology connects every device to every other; most reliable but most expensive
• Wi-Fi uses the IEEE 802.11 standard for wireless LAN communication
• NFC (Near Field Communication) range is up to 4 cm; used for contactless payments
• 5G offers speeds up to 10 Gbps; successor to 4G/LTE mobile network technology
• Fiber optic cable transmits data as light pulses; fastest and most immune to interference
• Twisted pair cable is the most common LAN cable type; UTP and STP variants
• A Firewall monitors and filters network traffic based on security rules
• VPN creates an encrypted tunnel over the public internet for secure communication
• SSL stands for Secure Sockets Layer; TLS is its modern replacement; both encrypt web traffic
• A DDoS attack floods a server with requests from many compromised computers simultaneously
• The Internet is a global network; the WWW (World Wide Web) is a service that runs on the Internet
• An ISP (Internet Service Provider) gives you access to the internet; examples in India: Jio, Airtel, BSNL

5-Day Study Plan to Master Networking for SSC Exams

Day 1: Network Basics and Types

• Learn the definition of computer network and its purpose
• Study all network types: PAN, LAN, MAN, WAN, CAN, VPN with their coverage and examples
• Memorize the LAN vs MAN vs WAN comparison table

Day 2: Network Devices and Topology

• Study all 10 network devices: Hub, Switch, Router, Modem, Bridge, Repeater, Gateway, NIC, AP, Firewall
• Learn the key difference between Hub vs Switch, and Router vs Modem
• Study all network topologies: Bus, Star, Ring, Mesh, Tree, Hybrid with their pros and cons

Day 3: OSI Model, TCP/IP, and Protocols

• Master all 7 OSI layers with names, functions, and the memory tricks
• Compare OSI model with TCP/IP model
• Study all important protocols with full forms, functions, and port numbers

Day 4: Internet Concepts and Wireless Networking

• Study Internet, Intranet, Extranet, WWW, URL, DNS, ISP, and browser concepts
• Learn IPv4 vs IPv6 differences and IP address classes
• Study Wi-Fi, Bluetooth, NFC, 4G, 5G, and WiMAX wireless technologies

Day 5: Security, Revision, and Practice

• Study network security: Firewall, VPN, SSL/TLS, DDoS, Phishing
• Revise all networking abbreviations from the table
• Solve 40 to 50 networking questions from SSC previous year papers

READ ALSO: SSC Computer Complete Batch Software PPT Slides (LEC #5)

(FAQs)

Q1. What are the types of computer networks?

Computer networks are classified by geographic coverage into: PAN (Personal Area Network – for personal devices in a small range), LAN (Local Area Network – for a building or campus), MAN (Metropolitan Area Network – for a city), and WAN (Wide Area Network – for countries or global coverage). The Internet is the world’s largest WAN.

Q2. What is the difference between Hub, Switch, and Router?

A Hub broadcasts data to all connected devices without filtering. A Switch sends data only to the specific destination device using MAC addresses. A Router connects different networks and routes data between them using IP addresses. In modern networks, switches have replaced hubs, and routers connect networks to the internet.

Q3. What are the 7 layers of the OSI model?

The 7 OSI layers from bottom to top are: Layer 1 Physical, Layer 2 Data Link, Layer 3 Network, Layer 4 Transport, Layer 5 Session, Layer 6 Presentation, and Layer 7 Application. The memory trick from Layer 1 to 7 is: Please Do Not Throw Sausage Pizza Away.

Q4. What is the difference between TCP and UDP?

TCP (Transmission Control Protocol) is reliable and connection-oriented; it guarantees that all data packets arrive correctly and in order, making it ideal for web browsing, email, and file transfers. UDP (User Datagram Protocol) is fast but connectionless; it sends data without waiting for acknowledgment, making it suitable for video streaming, online gaming, and voice calls where speed matters more than perfect delivery.

Q5. What is DNS in networking?

DNS stands for Domain Name System. It translates human-readable domain names (like google.com or sbi.co.in) into their corresponding numerical IP addresses that computers use to locate and connect to websites. DNS is often called the phone book of the internet and operates on Port 53.

Q6. What is the difference between IPv4 and IPv6?

IPv4 uses 32-bit addresses in dotted decimal format (like 192.168.1.1) and supports about 4.3 billion unique addresses. IPv6 uses 128-bit addresses in hexadecimal format and supports a virtually unlimited number of addresses (2^128). IPv6 was introduced to solve the problem of IPv4 address exhaustion as the internet grew beyond 4.3 billion devices.

Q7. How many slides are in the Networking PPT (LEC 6)?

The Networking Complete Batch PPT (LEC 6) contains 177 slides covering all 10 classes on computer networking. It is Serial Number 06 of the Complete Foundation Batch for All SSC Exams PPT Series. The file size is 80 MB.

Q8. What is the difference between Internet, Intranet, and Extranet?

The Internet is the global public network open to everyone. An Intranet is a private network accessible only to authorized members of an organization (like a company’s internal website). An Extranet is an extension of an intranet that allows specific external parties (vendors, partners, clients) limited controlled access to some parts of the organization’s internal network.

Conclusion: Networking Is the Bridge Between Computers and the Modern World

Computer Networking is the chapter that connects everything you have learned in the previous LEC modules to the real world. The CPU processes data (LEC 3), the software tells it what to do (LEC 5), and networking connects the entire system to billions of other computers and users around the globe. Without networking, there is no internet, no cloud, no digital India.

The 177-slide Networking Complete Batch PPT (LEC 6) covers every dimension of this topic that SSC exams test, from basic network types and topology to the detailed OSI model, protocol port numbers, IP addressing, wireless technologies, and network security. The visual, bilingual format of the PPT ensures that even complex concepts like the OSI model and TCP/IP stack become visually clear and memorizable.

Study the network types and devices thoroughly since they generate the most questions. Master the protocol full forms and port numbers. Learn the OSI model layers with the memory trick. Understand IPv4 vs IPv6, DNS, and the internet vs intranet distinction. Together these form the core of every networking question you will ever face in an SSC exam.

Download the free PDF from https://slideshareppt.net/, follow the 5-day study plan, revise the abbreviation table and all comparison tables, and practice previous year networking questions consistently. Networking will quickly become one of your highest-scoring Computer Awareness topics in any SSC exam.

Keep going through the series: LEC 1 (Architecture), LEC 2 (Hardware), LEC 3 (CPU), LEC 4 (Output Devices), LEC 5 (Software), and now LEC 6 (Networking). You are building a complete, exam-ready foundation for SSC Computer Awareness.