Computer Communication Networks

Teacher : Suneel Kumar Kothari

Teachers Time Table: Link Sheet: Link

Beej Guide

Lecture 1 & 2

• My Introduction and policies

• What is Networks

• What is internet

• Wired and wireless technologies for communication

• Component of networks

  • End devices, communication links and packet switches

• Data and packets

• What is protocols

• An Analogy for networks using factory

• internet standards

• Services provided by networks (specifically TCP/UDP Reliable/Unreliable)

• Network API

• Client server and Peer to peer model

• Network Structure

  • Edge and Core

  • Access Network

• What is bandwidth? Lecture 1 & 2

Lecture 3

• 5 Layers of Network

• Protocol at each level

• Network Architecture (P2P, Client and Server)

• Encapsulation

• Introduction to Sockets Lecture 3

Lecture 4

• More Detail about socket (Well known and dynamic ports)

• Purpose of port#

• Access Network

  1. Home Access Network

  2. DSL,FTTH, Cable network, Enterprise level

  3. What is Multiplexing (TDM,FDM, random access)

  4. Wireless access Network

• Physical Medium

  1. Guided and Unguided Lecture 4

Lecture 5

Circuit Switching

• • TDM and FDM

  • Pros and Cons

Packet Switching

• • Packet loss

  • delay

TDM related problems

• • Frame rate

  • Data rate of TDM line and single slo

  • Frame and slot

Lecture5

Lecture 6

Continuation of Lecture 5

• • Statically multiplexing

  • Comparison of Statically and Time division multiplexing

Types of delays

• Trace route command

• Bottleneck link

• Throughput

Delay Problems

Lecture6

Assignment 1

Lecture 7- 8

• Introduction to Http

• Persistent and non persistent connections and their difference

• Request and response message formats and discussion

• Cookies

• Web cache (Proxy Server) - conditional gate

• Activities on Http Lecture 7-8

Quiz 1 with solution

Lecture 9

• DNS

• Services provided by DNS

• DNS hirerical Structure

• Resource Record types

• Activities for practice

• CP2 activity on DNS

Assignment 2

Lecture 9

Lecture 10

• Socket programming

• TCP Iterative and concurrent

• Discussion of basic commands Lecture 10

Quiz 2 with solution

Lecture 11

• DNS activity in detail discussion

• Introduction to Transport Layer

  • Service provided by transport layer

  • connection less and connection oriented demultiplexing

  • TCP and UDP Lecture 11

Lecture 12

• UDP Packet structure

• Checksum Calculations

• Principle of reliability

  • ACk/NACK packets

  • Sequence #, Ack and Timer(stop and wait protocol)

  • Channel Utilization calculation Lecture 12

Quiz 3 with solution

Lecture 13

• Quiz 4

• Revision class

Quiz 4 with solution

Lecture 14

• GO back N

• Selective repeat

• Difference between selective repeat and Go back N

CP 4: How Window size<=2^k/2 resolve problem given in scenario (in slides) resolve by this formula?

Same slide of lecture 12

Lecture 15

• TCP segment structure and CP5

CP5:

Q1: What is difference between GO back N and selective repeat. write at least 3 points.

Q2: if we send packet 1,2,3,4 and 5 and packet 3 get dropped. What will effect in Go back N and selective repeat Lecture 15

Lecture 16

• Why TCP has length filed of 4 bits? Answer: click here

• Connection management in TCP

  • How TCP establishes connection - 3 way?

  • Closing down of TCP connection

  • Sequence number and ack number

• How to set timout for timer? Lecture 16

Lecture 17

• Retransmission scenario in TCP.

• Double timeout interval in TCP

• TCP ack events and receiver action

• TCP fast retransmission

  • 3 duplicate ack and timeout

  • Which one is more dangerous

• TCP Flow control Lecture 17

Assignment 3

Lecture 18

• Congestion Control (CC)

  • Types of CC

  • Mechanism of congestion control (Slow Start, Congestion avoidance)

  • Fast recovery (TCP Reno and TCP Tahoe) Lecture 18

Lecture 19 & 20

• Introduction to Network Layer

  • Forwarding and Routing

  • Connection oriented and connection less

    • Datagram and Virtual Circuit

• Datagram Network

• Longest Prefix Matching

• Inside Router

• IPv4 datagram format

• IP fragmentation Lecture 19-20

Lecture 21-22

• Subnetting

  • What is IP Address

  • How to find number of sub networks

  • Host and network portion meaning in IP

  • Classfull IP address

  • Classless IP address

    • two examples

• Subnet mask Purpose

• DHCP

• NAT Lecture 21-22

Lecture 23

• Routing Algorithm

  • Dijestra

  • Belmen fold equation Lecture 25-26 Assignment 4