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Computer Networks Study Guide

This document outlines the topics covered in a course on computer networks. It discusses the ISO/OSI reference model, circuit switching and datagram switching, cable networks, transmission media, frame formats, Ethernet, CSMA/CD, noiseless and noisy channels, the Internet Protocol, routing, IGMP, TCP, congestion control, quality of service techniques, UDP, process to process delivery, digital signatures, symmetric key algorithms, HTTP, FTP, and SMTP. It provides details on the key aspects and concepts within each of these topics.

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81 views7 pages

Computer Networks Study Guide

This document outlines the topics covered in a course on computer networks. It discusses the ISO/OSI reference model, circuit switching and datagram switching, cable networks, transmission media, frame formats, Ethernet, CSMA/CD, noiseless and noisy channels, the Internet Protocol, routing, IGMP, TCP, congestion control, quality of service techniques, UDP, process to process delivery, digital signatures, symmetric key algorithms, HTTP, FTP, and SMTP. It provides details on the key aspects and concepts within each of these topics.

Uploaded by

Mangalam
Copyright
© © All Rights Reserved
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com

DHANALAKSHMI SRINIVASAN INSTITUTE OF RESEARCH


AND TECHNOLOGY-SIRUVACHUR
CS6551-COMPUTER NETWORKS
PART-B
UNIT –I
1. Discuss about ISO/OSI reference model with neat sketch
 Physical
 Datalink layer
 Network layer
 Transport layer
 Application layer
 Presentation layer
 Session layer
2. Explain in detail about circuit switching and datagram switching
with diagram
 Three phases
 Efficiency
 Delay
 Routing Table
 Efficiency-RT
 Delay-RT

3. Explain about Cable Networks


 Traditional Cable networks
 Hybrid fibre-coaxial network
 Bandwidth
 Sharing

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 CM and CMTS
 DOCSIS

4. Explain Transmission media.


 Guided media
 Twisted pair cable
 Coaxial cable
 Fibre-optical cable
 Unguided media:wireless
 Radio waves
 Micro waves
 Infra red

UNIT-II
1. Explain and detail about frame format for and Control field of
HDLC
 Configuration and transfer modes
 Frames
 Control field
2. Discuss and detail about Standard Ethernet and Fast Ethernet
Standard Ethernet
 MAC sublayer
 Physical layer
IEEE standards
 Data link layer
 Physical layer

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Fast Ethernet
 MAC sublayer
 Physical layer

3. What is CSMA/CD? How does it work? Distinguish between 1-


Persistent and non-Persistent CSMA
ALOHA
 CSMA
 CSMA/CD
 CSMA/CA
Controlled Access
 Reservation
 Polling
 Token Passing

4.Explain in detail about Noisy and Noiseless channel.


Noiseless channel
 Simplest protocol
 Stop and wait protocol
Noisy channel
 Stop and wait Automatic repeat request
 Go back N repeat request
 Selective repeat Automatic Repeat request
 Piggy backing

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UNIT III

1. Briefly explain the following mechanism


i)Internet Protocol-IPV4,IPV6

IPV4
 Address space
o Notations
o Classful Addressing
o Classeless Addressing
o NAT
IPV6
 Structure
 Address space

2 .Briefly explain the following mechanism


1)Routing-Unicast, Multicast Routing Protocols

UNICAST PROTOCOLS
 Optimization
 Intra and interdomain routing
 Distance vector routing
 Link state routing
 Path vector routing

MULTICAST ROUTING
 Unicast,Multicast and broadcast
 Applications
 Multicast routing
 Routing protocols

3. Breifly explain IGMP message format and Operation.

 Group management

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 IGMP message
 Message Format
 IGMP operation
 Encapsulation
 Natstst utility

UNIT IV
1. Draw the structure of TCP segment. Explain the feature of TCP
 TCP Service
 TCp feature
 Segment
 A TCP connection Flow control
 Error control
 Congestion control

2. Explain in detail about Congestion control techniques in transport


layer
 Open loop congestion control
 Closed loop congestion control
Examples
 Congestion control in TCP
 Congestion control in Frame Relay

3. Explain the techniques to improve QoS.


Qos:
 Flow characteristics
 Flow classes
Techniques to improve Qos:
 Scheduling
 Traffic Shaping
 Resource Reservation
 Admission Control

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4. Explain UDP in detail.

 Well known ports for UDP


 User datagram
 Check sum
 UDP operation
 Use of UDP

5. Explain Procss to process delivery.


 Client/server paradigm
 Multiplexing and Demultiplexing
 Connectionless vs Connection
 Reliable vs unreliable
 Three protocols

UNIT V
1. Explain about Digital Signature
 Comparison
 Need for keys
 Process
 Services
 Signature schemes

2. Explain in detail about symmetric key algorithms with neat sketch


 Traditional ciphers
 Simple modern ciphers
 Modern round ciphers
 Mode of operation

3. Describe in detail about HTTP


 HTTP transaction
 Persistent vs Non persistent connection
 Proxy server

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4. Illustrate the operation of FTP with a neat sketch


 File transfer protocol
 Anonymous FTP

5. Describe how SMTP protocol is used in E-mail applications


 Architecture
 User agent
 Message transfer agent:SMTP
 Message access agent:POP and IMAP
 Web based mail

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