Name of the College : SREE CHAITANYA COLLEGE OF ENGINEERING
University : JNTUH
Department : Electronics And Communication Engineering
Subject Code/Name : 07A70407/COMPUTER NETWORKS
Year/Sem : IV/I
Website : scce.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/scce.ac.in/4933-07A70407-COMPUTERNETWORKS.pdf
Computer Networks Question Paper :
Code No: 07A70407
R07 Set No. 2
IV B.Tech I Semester Examinations,December 2011
Related : Sree Chaitanya College Of Engineering 07A70408 Operating Systems B.Tech Question Paper : www.pdfquestion.in/4932.html
Common to Bio-Medical Engineering, Electronics And Telematics, Electronics And Instrumentation Engineering, Electronics And Communication Engineering
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions :
All Questions carry equal marks :
1. Explain in detail IDEA. [16]
2. (a) How congestion is controlled in V.C. subnets?
(b) What is Choke packet? How does the choke packets helps in congestion control? [8+8]
3. (a) Discuss circuit switching and packet switching methods. Also discuss their merits and demerits.
(b) Differentiate between the following:
i. bit rate and baud rate
ii. single mode fiber and multi mode fiber. [12+4]
4. (a) How will you determine the performance of stop & wait protocol?
(b) What is piggybacking? What are its advantages?
(c) A upper layer message is split into 10 frames, each of which has a 80 percent chance of arriving undamaged. If no error control is done by the data link protocol, how many times must the message be sent on the average to get the entire thing through? [5+5+6]
5. (a) Explain the protocol designed for wireless LANs.
(b) Imagine two LAN bridges, both connecting pair of 802.4 networks. The first bridge is faced with 1000 512-byte frames per second that must be forwarded. The second is faced with 200 4096-byte frames per second. Which bridge do you think will need the faster CPU. Discuss. [8+8]
6. (a) How the complexity at Network layer & Transport layer varies with connection oriented and connectionless service?
(b) Suppose Network layer provides connection less service, Transport layer connection oriented service, then how reliability is achieved?
(c) How Virtual circuit is different from Physical connection? [8+4+4]
7. (a) With a neat diagram explain the relation between layers at an interface.
(b) Define OSI reference model. Suppose in an arbitrary network as shown in Figure 7b the Host1 communicates with Host2. During the process of communication which layers as per OSI reference model will remain transparent to the nodes A to D and why? [8+8]
8. (a) Explain the transport service primitives.
(b) Imagine that a two-way handshake rather than a three-way handshake were used to set up connections. In other words, the third message was not required. Are deadlocks now possible? Give an example or show that none exit. [8+8]
Code No: 07A70407
R07 Set No. 4
1. (a) Explain in detail binary count down collision free protocol.
(b) Give the detailed description of 802.3 frame format. [8+8]
2. Give the format of TCP segment Header and explain its dierent elds. [16]
3. (a) Explain about ISDN architecture.
(b) Dierentiate between optical ber and coax. [10+6]
4. (a) Compare Circuit switching with Packet switching.
(b) Consider any two networks of your choice which support Circuit switching or Packet switching and explain them in detail.
(c) Explain the strategy that can be used at the receiver to achieve reordering of the packets. [6+6+4]
5. (a) Explain with an example how data can be transmitted using the OSI model.
(b) Explain the format of a Novell Netware IPX packet. [8+8]
6. (a) What is Logical address and Physical address in computer networks? Why a mapping from logical address to physical address and vice versa is required?
Explain the protocols which perform it.
(b) Explain Special IP address. [10+6]
7. (a) Discuss the error control technique which is commonly used in data network. What value of N is used in go-back-N ARQ technique used in ARPANET and why?
(b) Imagine that you are writing the data link software for a line used to send data to you, but not from you. The other end uses HDLC, with a 3-bit sequence number and a window size of seven frames.
You would like to buffer as many out of sequence frames as possible to enhance eciency, but you are not allowed to modify the software on the sending side.
Is it possible to have a receiver window greater than one, and still guarantee that the protocol willnever fail? If so, what is the largest window that can be safely used? [8+8]
8. DNS uses databases. Database can be centralized or distributed. What are the pros and cons of centralized and distributed data base approaches. What type of database DNS actually uses? [16]