NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
SEPTEMBER/OCTOBER 2015 EXAMINATION

COURSE CODE:                                                                              CIT 305                                                                               

COURSE TITLE:                                                                             Networking and Communication Technology

DURATION:                                                                                     3 Hours

INSTRUCTIONS:                                                                            Answer any five questions.

Q1a.     Write down four reasons why computers are networked.

Q1b.    Briefly explain what a Virtual Private Network is.

Q2a.     Write short notes on the following types of physical media:

i.          Twisted pair cable    ii.         Coaxial cable              iii.        Fibre-optic cable

Q2b.    Distinguish between Ether net and Gigabit Ethernet.

Q3a.     Describe the Data Link layer of the OSI Reference model.

Q3b.    Write a brief note on the IEEE802.11 standard popularly known as Wi-Fi, listing the two challenges it must overcome in comparison with the wired networks.

Q4a.     Briefly describe what TCP is, explaining why it is considered a reliable protocol.

Q4b.    Explain the addressing and other functions of the Internet Protocol (IP) in the IPv4 Internet suite.

Q5a.     Briefly describe four threats facing an enterprise network connected to the Internet.

Q5b.    Distinguish between a LAN and a WAN.

Q6a.     Briefly describe the following as applied to network planning and design:

i.          Business requirements        ii.         Proof of concept

Q6b.    Give a brief description of the following:

i.          Modem           ii.         Multiplexer

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.