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Posted By: neyha Member Level: Diamond Posted Date: 07 May 2008
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2006 Anna University Electronics and Communication B.E./B.TECH.DEGREE EXAMINATION, NOV /DEC 2006:COMPUTER NETWORKS Question paper
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B.E./B.TECH.DEGREE EXAMINATION, NOV /DEC 2006
V -SEMESTER
COMPUTER NETWORKS
TIME : 3 HRS
MAX MARKS : 100
PART - A (10 X 2 = 20 MARKS)
1. State the major function performed by the presentation layer of the ISO OSI model
2. A sine wave has a frequency of 6 Hz. What is it's period?
3. Briefly discuss stop- and - wait method of flow control.
4. List the two types of data frames in FDDI.
5. List the tw forms in which virtual circuit packet switching is implememyed
6. Which class does the following IP address belong to?
7. What is a datagram socket?
8. "TCP software is implemented as a finite state machine ". Discuss
9. What is a domain name service?
10 State the application layer protocol in the TCP/IP protocol suit that provides acess to a networked file server.
PART - B (5 X 16 = 80 )
11 (a) (i) What is protocol? List the three key elements of a protocol.
(ii) With relevent examples differentate between simplex , half dupex and full duplex communication
(iii) A sine wave completes one cycle in 25 10 ^ 6 seconds.What is it's frequency? Express the frequency in KHz.
(iv) A digital signal has bit interval of 40 micro second. What is it's bit rate? Express the bit rate in Kbps.
OR
(b) (i) An analogue signal carries four bits in each signal element . If 1000 signal elements are sent per second ,find the baud rate and the bit rate.
(ii) Discuss the role played by repeaters in terestrial microwave communication ? I s the distance between the repeaters fixed? Discuss
(iii) A network has n device .Dtermine the number of cablelinks required for a cable mesh,ring,bus and star topology
12 (a) (i) A block 32 bits has to be transmitted.Discuss how the 32 bit block is transmitted to the receiver using longitudinal redundancy check.
(ii) Consider a 32 bit block data 11100111 110111101 00111001 10101001 that has t be transmitted.f longitudinal redundancy check is used what is the transmitted bit stream?
(iii) In the hamming code , for a data unit of m bits how do you compute the number of redundant bits 'r' needed?
(iv) What kind of errors can vertical redundancy check determine?What kinds of errors it cannot determine?
OR
(b) (i) List the three main functions performed by the data link layer of the ISO OSI model.
(ii) Explain the working of carrier sense multiple acess protocol.
(iii) How does token ring LAN operate ? Discuss.
(iv) List the briefly discuss the two different basic transmission technologies that can be used to set up wireless LAN's
13 (a) Stae which layers of the ISO OSI model does the following interconnecting devices operate.
(ii) State the major difference between distance vector routing and link state routing . Discuss how theie routing techniques work.
OR
(b) (i) What is subnetting?.Discuss. Also state which classes of IP address can be subnetted
(ii) What is subnet masking? Discuss.
(iii) How can we prove that we have 2,147,483,648 addresses in class A ?
(iv) What is the subnetwork address if the destination address 200.45.34.56 and the subnet mask is 255.255.240.0?
14 (a) List and discuss the various primitives for a simple transport system.
(ii) "DNS can use the service of UDP or TCP using port 53 ". Discuss when UDP is used and when TCP is used.
(iiii) Highligth the features of UDP briefly discuss the same.
OR
(b) (i) Discuss connection establihment and connection release in TCP.
(ii) Discuss how TCP provides reliability using error control.
(iii) Discuss the strategies TCP uses to avoid congestion.
15 (a) (i) With a releveant example discuss how the domain space is divided.
(ii) Distinguish between a fully qualified domain name and a partially qualified domain name. Give relevent example
(iii) List the various risks faced by messages that are transmitted over the internet.
OR
(b) (i) Discuss how simple mail transfer protocol (SMPT) works?Can multimedia messages be transmitted using SMTP? Discuss
(ii) Is common gateway interface a language? Discuss
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