CN (B-TECH Electronics and Communication Engineering 7-8th)

UNIT 1. Introduction to Computer Networks:

Data Communication System and its components, Data Flow, Computer network and its

goals, Types of computer networks: LAN, MAN, WAN, Wireless and wired networks,

broadcast and point to point networks, Network topologies, Network software: concept of

layers, protocols, interfaces and services, ISO-OSI reference model, TCP/IP reference

model.

Unit 2. Physical Layer:

Concept of Analog & Digital Signal, Bandwidth, Transmission Impairments: Attenuation,

Distortion, Noise, Data rate limits : Nyquist formula, Shannon Formula, Multiplexing :

Frequency Division, Time Division, Wavelength Division, Introduction to Transmission

Media : Twisted pair, Coaxial cable, Fiber optics, Wireless transmission (radio, microwave,

infrared), Switching: Circuit Switching, Message Switching ,Packet Switching & their

comparisons.

Unit 3. Data Link Layer:

Design issues, Framing, Error detection and correction codes: checksum, CRC, hamming

code, Data link protocols for noisy and noiseless channels, Sliding Window Protocols: Stop

& Wait ARQ, Go-back-N ARQ, Selective repeat ARQ, Data link protocols: HDLC and

PPP.

Unit 4. Medium Access Sub-Layer:

Static and dynamic channel allocation, Random Access: ALOHA, CSMA protocols,

Controlled Access: Polling, Token Passing, IEEE 802.3 frame format, Ethernet cabling,

Manchester encoding, collision detection in 802.3, Binary exponential back off algorithm.

Unit 5. Network Layer:

Design issues, IPv4 classful and classless addressing, subnetting, Routing algorithms:

distance vector and link state routing, Congestion control: Principles of Congestion Control,

Congestion prevention policies, Leaky bucket and token bucket algorithms.

Unit6. Transport Layer:

Elements of transport protocols: addressing, connection establishment and release, flow control and

buffering, multiplexing and de-multiplexing, crash recovery, introduction to TCP/UDP protocols and

their comparison.

Unit 7. Application Layer:

World Wide Web (WWW), Domain Name System (DNS), E-mail, File Transfer Protocol (FTP),

Introduction to Network security