Computer Networks Answers

The Open Systems Interconnection model is a conceptual model that characterises and standardises the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. 2.1 Describe the five principles that were followed/applied to arrive at the seven layers. (10) 2.2 Discuss the functions of each layer of the OSI model and protocols used. (15) 2.3 Describe the design issues associated with the Network layer of the OSI model

“Network topology can simply be defined as the arrangement of the elements (links, nodes, etc.) of a communication network”. With reference to the foregoing statement, use a well labelled diagram, describing any three types of Network topologies and highlighting their advantages and disadvantage

Discuss the IPv4 Datagram with the help of suitable examples.

An organization is granted a block of addresses with the beginning address

150.25.0.0/24. The organization needs to have 3 subblocks of addresses to use in its three

subnets: one subblock of 11 addresses, one subblock of 40 addresses, and one subblock of

125 addresses. Design the network and plot it completely with respective subnets, IP range,

Network IDs. In detail with diagram

Cite a situation in which you can apply the knowledge of creating straight u through cable.

In the IPv4 Header format following information is given in decimal number system, with respect to the given information calculate the header checksum value. (10)

VER=4

HLEN =6

Service type=9

Total length=26

Identification=2

Flag=3

Fragmentation offset=0

Time to live=5

Protocol=12

Source IP Address=11.13.12.6

Destination IP Address=10.6.8.11

Discuss one Input-Output communication technique that is used

in a computer system; and outline the steps involved

Mention and explain each field of IPv4 header in detail, by taking suitable examples.

Find the first address, last address and the number of addresses of a network whose one

of the IP addresses is 50.28.22.75 / 25.

In the IPv4 Header format following information is given in decimal number system, with

respect to the given information calculate the header checksum value. (10)

VER=4

HLEN =6

Service type=9

Total length=26

Identification=2

Flag=3

Fragmentation offset=0

Time to live=5

Protocol=12

Source IP Address=11.13.12.6

Destination IP Address=10.6.8.11