Thapar University 2006 M.C.A Computer Networks - Question Paper
Thapar Institute of Engineering and Technology, Patiala
MCA (End Semester Examination)
Computer Networks
M.M. 36
3
School of Mathematics & Computer Applications CA-015(Computer Networks)
End Semester Exam. (12/12/2006)
Time: 3 Hr M.M.
Note: Question No. 1 is compulsory. Attempt only five questions Attempt all parts of a question in sequence.
Ql.a How a network software is designed? Explain your answer in detail.
b What is the difference between fully qualified domain name and flat 3 names? Is it possible to use the flat name on the Internet? Explain the service which uses FQDN and which uses flat names.
c Explain any four services for which UDP protocol is preferred? Give 2 reason.
Q2.a If the data link can detect errors between hops, do you think why we need 2 another checking mechanism at the transport layer? Explain your answer.
b Explain the functionalities of the presentation layer in OSI reference 3
model?
c Calculate the bit rate for a telephone having bandwidth of 3000 Hz and 2 signal to noise ratio 4095. How we can increase the bit rate from the. calculated value?
Q3.a What is multiplexing? Explain FDM. 2
b Compare and contrast the Go Back N ARQ protocol with Selective 2 Repeat ARQ?
c Construct the Hamming code for the bit sequence 1001001100, by using 3 even parity. Explain your answer.
Q4.a When bit stuffing is used, is it possible for the loss, insertion, or 3 modification of a single bit to cause error not detected by the checksum?
If not, why not? If so, how? Does the checksum length play a role here?
b Find the maximum throughput for the pure ALOHA and slotted ALOHA. 2
c What is multiple access? Which sub layer controls the multiple access in a 2 standard Ethernet?
Q5.a Is Internet connection oriented or connectionless architecture? Explain 3 your answer?
b An Ipv4 packet arrived with the first few hexadecimal digits as shown 2 0x45000028000202...
How many hops this packet can travel before being dropped? Write the upper layer protocol number to which the packet belongs?
c What is address aggregation? Why it is used? 2
Q6.a Explain the ARP packet format? 3
b Explain the addresses, which are used in the networking? 2
c Explain the use of XOR and AND operation in the networking. Explain 2 with examples.
Q7.a Explain the TCP header, in detail? 3
b Explain the following services 2
(i) Ping
(ii) Telnet
c Which one is faster FTP or TFTP? Give reasons for your answer 2
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