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NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2016 EXAMINATION
COURSE CODE: CIT 305
COURSE TITLE: Networking and Communication Technology
DURATION: 3 Hours
INSTRUCTIONS: Answer any five questions.
Q1a. Briefly explain what a Virtual Private Network is.
Q1b. Write down four reasons why computers are networked.
Q2a. Briefly explain the difference between Ethernet and Gigabit Ethernet.
Q2b. Write short notes on the following types of physical media:
i. Unshielded Twisted pair (UTP) cable ii. Fibre-optic cable
iii. Coaxial cable
Q3a. Describe the Network layer of the OSI Reference model.
Q3b. Write a brief note on the IEEE802.11b Wi-Fi standard listing the Internet Protocol (IP) in the IPv4 internet suit.
Q4a. Briefly explain why TCP is considered a reliable protocol.
Q4b. Explain the addressing and other functions of the Internet Protocol (IP) in the IPv4 Internet suite.
Q5a. Explain briefly four threats that may face an enterprise network that is connected to the
internet.
Q5b. Distinguish between a MAN and a WAN
Q6a. Give a brief description of the following:
- Multiplexer ii. Modem
Q6b. Briefly describe the following as applied to network planning and design:
i. Business requirements ii. Proof of concept
Q7a. Describe four types of noise, indicating which type is particularly harmful to digital data.
Q7b. Give a brief description of the ISDN technique highlighting its main advantage over other communication techniques.
