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Comp 312: Computer Networks Question Paper

Comp 312: Computer Networks

Course:Bachelor Of Education Science

Institution: Kabarak University question papers

Exam Year:2008

COURSE CODE: COMP 312
COURSE TITLE: COMPUTER NETWORKS
STREAM: SESSION VI & VII
DAY: TUESDAY
TIME: 9.00-11.00 A.M.
DATE: 25/11/2008
INSTRUCTIONS:
1. This question paper has FIVE questions
2. Answer question ONE and any other TWO questions
QUESTION ONE (30 MARKS) COMPULSORY
(a) Explain the meaning of following terms
i. Extranet
ii. Runts
iii. Boot ROM
iv. Encryption (8mks)
(b) Distinguish between
i. LaserJet and infrared transmission waves
ii. Network protocol and the OSI reference model (4mks)
(c) Convert the following
i. Decimal number 191 to octet binary number (2mks)
ii. 00010001 binary number to a decimal number (2mks)
(d) Explain three advantages and three disadvantages of twisted cables (6mks)
(e) Use Nyquist theorem to determine the maximum capacity a channel can carry if it
allows a low-pass signal of 90mHz bandwidth (3mks)
(f) For the following IP addresses, identify the class, network id, host id and correct
sub netting.
i. 192.16.4.26
ii. 26.0.10.17 (5mks)
QUESTION TWO (20 MARKS) ELECTIVE
(a) Distinguish between
i. intelligent and passive hubs (2mks)
ii. ISA and PCI (2mks)
iii. Firewall and antivirus (3mks)
(b) Differentiate between cut-through and store-and-forward switching modes as in
switches (5mks)
(c) Describe three categories of routers (9mks)
QUESTION THREE (20 MARKS) ELECTIVE
(a) What is the difference between data and signal? (2mks)
(b) Give three reasons why hubs are needed in wireless transmissions (3mks)
(c) Describe the difference between Non-return zero and Non-return zero-inverted
encoding schemes wave formats (4mks)
(d) Plot a Non-return to zero-inverted graph for the input value 00101110 (5mks)Fpag
(e) Describe how token ring access method works (6mks)
QUESTION FOUR (20 MARKS) ELECTIVE
(a) i. What is Ethernet technology? (2mks)
ii. Differentiate between 10Base2 and 100Base5 Ethernet (5mks)
iii. Describe an Ethernet frame structure (10mks)
(b) Determine the maximum channel capacity of an 8 kHz channel that has a thermal
noise of 80dB (3mks)
QUESTION FIVE (20 MARKS) ELECTIVE
(a) What is a network protocol? (2mks)
(b) Describe Physical layer, data link layer and network layer of the OSI reference
model (9mks)
(c) For each of the following protocols, write their names in full, outline their
functions and state the OSI reference model layer they operate
iv. UDP
v. FTP
vi. IP (9mks)

Comp 312: Computer Networks Question Paper

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