Course module

Computer Networks — SSC JE 2026 – IMD Scientific Assistant – Computer Science (Paper 1 + Paper 2)

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Lessons: 251
Duration: 20 hr 7 min
PYQs: 112
Practice: 1140

6% of this course's PYQ weight is covered in this module.

Syllabus index

Lessons in this module

251 linked lessons

Previous-year questions

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Lessons in this module

Introduction to CN

Basics & Criteria

Modes & Connections

Network Topologies

Types of Networks

Switching Techniques

Transmission Media

OSI Model & Layers

DLL: Access Control

DLL Overview & MAC

ALOHA Protocols

CSMA Variants

CSMA/CD

CSMA/CA (Wireless)

Controlled Access

Channelization

DLL: Flow Control

Basics & Delay Analysis

Stop-and-Wait ARQ

Go-Back-N Protocol

Selective Repeat ARQ

DLL: Error Control

Basics & Hamming Dist

Linear Block Codes

Checksum & CRC

DLL: Framing

Intro & Byte Stuffing

Bit Stuffing Algo

Data Link Layer - Ethernet

Overview and Evolution of Ethernet – IEEE 802.3

Ethernet Frame Format – Preamble, SFD

Manchester Encoding – G.E. Thomas, IEEE, and Differential Manchester Schemes

Net Layer: IPv4 & Proto

Net Layer & IPv4 Basics

Fragmentation & MTU

TTL, Protocol & Checksum

IP Options & Padding

Net Layer Protocols

Net Layer: IP Addressing

Classful Addr & Casting

Subnetting & FLSM Design

CIDR & VLSM

Supernetting & Spl IPs

Net Layer:Routing Protocol

Routing Basics & Flooding

DVR, RIP & Split Horizon

LSR, OSPF & Comparison

Transport Layer Services

Services, Ports & UDP/TCP

TCP Header & Fields

Conn. Mgmt & Reliability

TCP State Transition Diag

TL: Congestion & UDP

Congestion Control Policy

Timers, RTT & SWS

UNIX Socket Programming

UDP Protocol & Header

Application Layer

Email: SMTP, POP & IMAP

HTTP Protocol

FTP, DNS & Telnet

Hardware Basics

Repeater, Hub, Bridge & Switch

Router & Gateway

Previous-year questions

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