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Computer Networks Question Paper
Computer Networks
Course:Bachelor Of Computer Science (It Telecommunication)
Institution: Kabarak University question papers
Exam Year:2010
Page 1 of 3
KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2010/2011 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER SCIENCE
COURSE CODE: COMP 312
COURSE TITLE: COMPUTER NETWORKS
STREAM: Y3S1
DAY: TUESDAY
TIME: 2.00 – 4.00 P.M
DATE: 14/12/2010
INSTRUCTIONS:
1. This question paper has FIVE questions
2. Answer question ONE and any other TWO questions
PLEASE TURNOVER
Page 2 of 3
QUESTION ONE (30 MARKS) COMPULSORY
(a) Explain the meaning of following term
i. BootROM
ii. Block Checksum
iii. Encryption (6mks)
(b) Distinguish between
i. Physical and logical network topology
ii. ISO reference model and network protocols
iii. GSM and CDMA (6mks)
(c) For an administrative password to be strong and secure it should be of certain
characteristics. State and explain five characteristics of a good password (5mks)
(d) An Ethernet network is used to transmit a 7.2KB document. Determine the maximum
and minimum possible number of frames that can be transmitted. (5mks)
(e) For each of the these four network issues; ISA, FTP, MAC and ICMP
i. Give their names in full (2mks)
ii. Explain their functionality in networking (4mks)
iii. State the OSI reference model they operate at (2mks)
QUESTION TWO (20 MARKS) ELECTIVE
(a) Explain the meaning of the terms
i. Thin Client
ii. Domain controllers (4mks)
(b) Describe peer-to-peer and client-server networks (6mks)
(c) Suppose you are invited as a network expert to talk to new students about networks. In
your speech, outline five advantages and five disadvantages of computer networks
(10mks)
QUESTION THREE (20 MARKS) ELECTIVE
A computer network student set up a network of three computers and assigned the following IP
addresses:
Computer 1: 01111111.00000000.00000000.00000001
Computer 2: 11000000.01000000.11000000.11111111
Computer 3: 11000000.01000000.11000000.01000000
i. Convert the above binary numbers 000000012, 010000002, 011111112, 110000002 and
111111112 to decimal numbers (10mks)
ii. Write down the computers’ IP addresses in decimal numbers (2mks)
iii. Identify the class, Network Id, Host Id and subnet for each of the IP addresses. (4mks)
iv. The student tested and found that the computers could not communicate. Give four IP
address considerations that the student must have not considered when assigning the IP
addresses (4mks)
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QUESTION FOUR (20 MARKS) ELECTIVE
(a) Explain the meaning of the following terms
i. Forwarding table
ii. Transceiver (4mks)
(b) Compare and contrast between repeaters and bridges (5mks)
(c) Twisted pair cables are the mostly widely used cables in LANs.
i. Describe how twisted pair cables are designed to reduce EMIs, crosstalk
and attenuation. (2mks)
ii. List four benefits and four drawbacks of using twisted pair cable
(4mks)
iii. The table below shows the different categories of TPs and corresponding
applications. Fill in the blank spaces (5mks)
Categories (CAT) Capacity (mbps) Application
CAT 1 20kbps Telephone for voice only
CAT 2
CAT 3
CAT 4
CAT 5
CAT 5e
CAT 6 >100 LAN for ATM
QUESTION FIVE (20 MARKS) ELECTIVE
(a) What is meant by the following terms
i. CSMA/CD
ii. IP Spoofing (4mks)
(b) Network security threats calls for appropriate measures. Give at least two examples of
threats for the following measures
i. Firewalls
ii. Proxy Server
iii. Log on restrictions
iv. Passwords
v. Encryption (5mks)
(c) Differentiate between 10Base2 and 100Base5 Ethernet standards (5mks)
(d) Discuss star and bus topologies giving at least one advantage and one disadvantage of
each. (6mks)
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