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Posted By: jegadesh Member Level: Gold Posted Date: 09 Dec 2007
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2006 Anna University B.E Computer Science CS1302 – COMPUTER NETWORKS Question paper
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B.E/B.TECG.DEGREE EXAMINATION, NOV/DEC 2006.
Fifth semester
Computer Science and Engineering
CS1302 – COMPUTER NETWORKS
(Common to Information Technology and B.E., (part tine) R 2006 Fourth Semester)
(Regulation 2004)
Time: Three hours Maximum: 100 marks
Answer ALL questions
PART A –(10 ´ 2 = 20 marks)
1. State the major functions performed by the presentation layer of the ISO OSI
model.
2. A sine wave has a frequency of 6 Hz. What is its period?
3. Briefly discuss stop – and – wait method of flow control.
4. List the two types of data frames in FDDL.
5. List the two forms in which virtual circuit packet switching is implemented.
6. Which class does the following IP address belong to?
(a) 157.143.252.207
(b) 93.31.1.245
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 suite that provides
access to a networked file server.
PART B – (5 ´ 16 = 80 marks)
11. (a) (i) What is a Protocol? List the three key elements of a protocol. (4)
(ii) With relevant examples differentiate between simplex, half duplex and
full duplex communication. (4)
(iii) A sine wave completes one cycle in 25us. What is its frequency?
Express the frequency in kHz. (4)
_
(iv) A digital signal has a bit interval of 40 microseconds. What is the bit
rate? Express the bit rate in Kbps. (4)
Or
(b) (i) An analog signal carries four bits in each signal element. If 1000 signal
elements are sent per second, find the baud rate and the bit rate. (4)
(ii) Discuss the role played by repeaters in Terrestrial Microwave
communication? Is the distance between repeaters fixed? Discuss. (4)
(iii) A network has n devices. Determine the number of cable link required for
a mesh, ring, bus and star topology. (8)
12. (a) (i) A block of 32 bits has to be transmitted. Discuss how the thirty two bit
block is transmitted to the receiver using Longitudinal Redundancy Check.
(6)
(ii) Consider a 32 bit block of data 11100111 11011101 00111001 10101001
that as to be transmitted. If Longitudinal Redundancy Check is used what
is the transmitted bit stream? (4)
(iii) In the Hamming code, for a data unit of m bits how you do compute the
number of redundant bits ‘r’ needed? (3)
(iv) What kinds of errors can Vertical Redundancy check determine? What
kinds of errors it cannot determing? (3)
(b) (i) List the three main functions performed by the data link layer of the ISO
OSI model. (3)
(ii) Explain the working of Carrier Sense Multiple Access protocol. (3)
(iii) How does a Token Ring LAN operate? Discuss (6)
(iv) List and briefly discuss the two different basic transmission
technologies that can be used to set up wireless LAN’s. (4)
13. (a) (i) State which layers of the ISO OSI model does the following
interconnecting devices operate. (4)
1. Repeaters
2. Bridges
3. Routers
4. gateways.
(ii) State the major difference between Distances. Vector Routing and Link
State Routing. Discuss how these routing techniques work. (12)
Or
(b) (i) What is sub netting? Discuss. Also state which classes of IP address
can be sub netted. (5)
(ii) What is subnet masking? Discuss.
(iii) How can we prove that we have 2, 147, 48, 648 address in class A?
(3)
(iv) What is the sub network address if the destination address is
200.45.34.56 and the subnet mask is 255.255.240.0? (5)
14. (a) (i) List and discuss the various primitives for a simple transport service. (6)
(ii) “DNS can use the services of UDP or TCP using port 53”. Discuss when
UDP is used and when TCP is used. (4)
(iii) Highlight the features of UDP and briefly discuss the same. (6)
Or
(b) (i) Discuss connection establishment and connection release in TCP (6)
(ii) Discuss how TCP provides reliability using error control. (6)
(iii) Discuss the strategies TCP uses to avoid congestion. (4)
15. (a) (i) With a relevant example discuss how the domain space in divided. (6)
(ii) Distinguish between a fully qualified domain name and a partially
qualified domain name. Give relevant example (6)
(iii) List the various risks faced by messages that are transmitted over the
internet. (4)
Or
(b) (i) Discuss how simple Mail Transfer Protocol (SMTP) works? Can
multimedia messages be transmitted using SMPT? Discuss. (10)
(ii) Is Common Gateway Interface a language? Discuss. (6)
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