Test Papers / Previous Question Papers of IGNOU CS69 TCP/IP Programming June 2007

BACHELOR IN COMPUTER APPLICATIONS

Term-End Examination

CS69 (S) : TCP/IP PROGRAMMING

Time: 3 hours
Maximum Marks: 75

Note : Question number 1 is compulsory. Answer any three questions from the rest.

June 2007

1. (a) Why has TCP /IP become a standard protocol for the Internet?

(b) How will you decide which class of IP address to use for a particular nelwork? Use suitable example. Does the maximum number of hosts in a network, restrict the class of IP address that can be used for the network? (6)

(i) 0.0.0.0

(ii) 127.0.0.1

(iii) 172.17.X.X

(iv) 255.255.255.255

(d) Why does lost acknowledgement not necessarily force the retransmission of TCP segment? (4)

(e) Instead of using L6 bits for the network part of a class B address originally, suppose 20 bits had been used. How many class B networks would there have been? (3)

(f) In electronic mail, what is MIME? Explain its functionality. (4)

(g) What is the purpose of FTP and Telnet? Explain their functionality. (6)

2. (a) Compare the TCP header and the UDP header. List the fields in the TCP header that are missing from UDP header, Give reasons for their absence. (9)

(b) Briefly describe the mechanisms used by TCP for flow control and congestion control. (6)

3. (a) What are the limitations of IPv4 address classes? How are a large number of IP addresses wasted using IPv4 address classes? What are the possible solutions to the limitations of IP addressing? (5)

(b) Answer the following questions : 2x5=10

(i) What is the minimum and maximum size of an IP datagram?

(ii) What is the minimum and maximum size of an IP datagram header?

(iii) What are the different types of criteria that can be specified using the Type of service field?

(iv) What is the use of the Time-to-Live (TTL) field in the IP header?

(v) which part of the IP datagram is used For calculating the checksum?

4. (a) What is an IP sub-network? What is the use of sub-networks? Is it necessary for hosts in a network 'M' to know about the subnetworks in another network 'N' to communicate with hosts in network 'N'. (5)

(b) ARP and RARP both map addresses from one space to another. In this respect, they are similar. In what way do they differ? (3)

(c) Why do we need a DNS system when we can directly use an IP address? What are the three domains of the domain name space? What is the purpose of the inverse domain?

5. Differentiate between the following : (3x5=15)

(a) TCP Model and OSI Model

(b) IPv4 and IPv6

(d) 2-way and 3-way handshake

(e) Error-control at lower layers and Error-control at TCP layer

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