Computer Network

(a) Write a short note on guided media.

Answer the following:

(e) Write a short note on DNS.

(b) What are the functions of session and presentation layer?. 

b) What is ATM. Give its architecture?

(b) What is automatic repeat request (ARQ)? Explain sliding window ARQ.

(a) What is checksum? Write methods for checksum generation and checksum checking. Find the checksum for the following bit sequence, assuming a 16 bit segment size- 1001001110010011

1001100001001101

b) What is Shannon capacity of a channel? Consider an extremely noisy channel is which the noise is so strong that the signal is faint. Compute the capacity of the channel

 Write various services of a broadband ISDN. Further, explain its physical specification as well.

(b) What is the role of IP address? Explain its different classes.

(a) Explain the TCP/IP network model. How is it different from OSI network model? 

In case where reliability is not of primary importance, UDP would make a good transport protocol. Give examples of specific cases.

Attempt the following questions:-

(a) What are two reasons for using layered protocols? What is one possible disadvantage of using layered protocols?

Discuss the header format of TCP

Discuss the header Panel of UDP.

What are the different elements of transport layer protocols?

Compare and contrast IPv4 and IPv6.

An organization is granted the block 211.17.180.0/24. The administrator wants to create 32 subnets. 

(i) Find the subnet mask 

(ii) Find the number of addresses in each subnet.

(ii) Find the first and last addresses in subnet 1. 

(iv) Find the first and last addresses in subnct 32. 

 (b) What is the difference between half duplex and full duplex transmission mode? 

(j) What is DNS and how is it useful?

(i) Write the difference between adaptive and non adaptive routing.

(h) What are the advantages and disadvantages of frame relay over X.25 network? 

(g) What are different access methods in broadband ISDN?

(f) What is FDDI? Give the frame format of it.

(e) Explain the difference between bridge, router and gateway.

(d) What does the term error control mean in data link layer?

c) Write any two advantages of fiber optic cable over twisted pair and coaxial cable. 

(a) Discuss the design issues in data link layer.

(a) Write any two differences between star and mess network topology.

b) What is internetworking and how is it achieved?

(a) Explain distance vector routing protocol with suitable example.

(a) What is network congestion? Explain leaky bucket algorithm for congestion control.

(b) Discuss the roles played by amplifiers repeaters and hubs.

(a) Discuss the working of high speed LANS.

What is IEEE.802.3 standard Ethernet? Explain CSMA/CD protocol used in it. Further, explain the addressing and frame of Ethernet.

b) Explain the working of sliding window protocol.

(a) Explain static and dynamic routing.

Answer the following:

d) What is Flooding?

Answer the following:

(c) Discuss different types of transmission impairments.

Answer the following:

(b) What are different components of data communication?

Answer the following:

a) Explain Shannon Capacity Theorem.

(a) Explain three-way handshaking connection management in TCP.

(b) What is forwarding function? Explain link state routing algorithm with an example.

Answer the following:

(f) Define network. Discuss various network criteria.

(a) What is routing? Explain distance vector routing algorithm with an example. 

(b) Differentiate between circuit, packet and message switching.

(a) Define Flow Control. Explain any one flow control algorithm.

(b) What is multiplexing? Explain various types of multiplexing.

(a) Define ISDN. What are its various services and layers?

(b) Differentiate between simplex, half duplex and full duplex.

(a) Draw a neat diagram of OSI model and explain the functioning of each layer. 

(b) Define throughput, bandwidth, response time, and frequency.

(b) Write a short note on following networking devices

(iv)routers

What is quality of service and what are general techniques to improve quality of service? 

Explain the similarities and differences between bridge and router in detail.

Explain why collision is an issue in a random access protocol but not in controlled access or channelizing protocols.

Compare and contrast the Go-Back-N ARQ Protocol with Selective-Repeat ARQ. 

Compare and contrast HDLC with PPP. Which one is byte-oriented; which one is bit-oriented? 

What are the disadvantages of using small, fixed length cells in ATM?

What is the remainder obtained by dividing x⁷ + x⁵ + 1 by the generator polynomial x³ +1?

What are the advantages of fiber optics over copper as a transmission medium? Is there any downside of using fiber optics over copper? 

Explain distance vector and link state routing protocols. What are the merits and demerits of the both protocols? 

(b) Write a short note on following networking devices

(iii) gateways

(b) Write a short note on following networking devices

(ii) bridges

(b) Write a short note on following networking devices:

(1) repeaters

Answer the following:

(j) Write a short note on cable modems.

Answer the following:

(i) Discuss Broadband-ISDN.

Answer the following:

(h) What is a datagram?

Answer the following:

(g) Explain Piggybacking and its benefits.