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Cisy 333:Wireless Communications Question Paper

Cisy 333:Wireless Communications

Course:Computer Information Systems

Institution: Kenya Methodist University question papers

Exam Year:2012

KENYA METHODIST UNIVERSITY

END OF 2ND TRIMESTER 2012 (EVENING) EXAMINATIONS
FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE & BUSINESS INFORMATION
UNIT CODE : CISY 333/BBIT 444
UNIT TITLE : WIRELESS COMMUNICATIONS
TIME : 2 HOURS

Instructions: Answer Question One (Compulsory) and any other Two Questions.

Question One

List and explain the limitations of infrared as a means of wireless data transmission.

(4 Marks)

With the aid of a diagram illustrate the i.E.E.E 802.11 wireless architecture and indicate its major components.

(4 Marks)

Describe briefly what the following terms in wireless communications mean.

(4 Marks)

Signal
Wave Length
Noise
Channel

Briefly explain how wireless networks can be used in the health industry.

(3 Marks)

Explain the concept behind I.M.S.I (International Mobile Subscriber Identity)in mobile cellular networks.

(2 Marks)

Differentiate between proactive sensor networks and reactive sensor networks.

(3 Marks)

In wireless communications, the association and interaction between an access point and a host is of great importance. Explain how this association occurs.

(2 Marks)

List and explain any TWO advantages of radio waves as a means of data transmission.

(4 Marks)

List any THREE security issues that are associated with MOBILE IP.

(3 Marks)

List any TWO application of mobile adhoc networks.

(2 Marks)

Question Two

Explain the table driven routing protol in mobile adhoc networks and give TWO examples of this protocol.

(5 Marks)

Explain what is meant by the Acronym R.F.I.D following which briefly describe any THREE of its applications in the world today.

(5 Marks)

Explain briefly the concept of fading, following which compare and contrast slow fading and fast fading based on the knowledge of propagation of signals.

(5 Marks)

Question Three

Discuss 3G cellular telephony and describe any two 3G technologies used in Kenya today.

(5 Marks)

Using illustrations differentiate between sky wave propagation and ground wave propagation.

(5 Marks)

Using an illustration differentiate between frequency hopping spread spectrum and direct sequence spread spectrum.

(5 Marks)

Question Four

Explain what the term antenna means, following which illustrate and explain the THREE types of antennas that are in use today.

(5 Marks)

Mobile IP was developed to enable computers maintain internet computers maintain internet connectivity while moving from one internet attachment point to another. Using a diagram explain the following processes of mobile IP. Agent Discovery, Registration and Return to home.

(10 Marks)

Question Five

Explain how the following security techniques are implemented in wireless networks.

IP Sec.

(3 Marks)

Transport layer security

(3 Marks)

Explain how CSMQA/CD is applied in the media access control layer of the data link layer in the I.E.E.E.802.11 standard.

(5 Marks)

Briefly explain what rate control in T.C.P of wireless networks is all about, listing TWO problems that it solves.

(4 Marks)

Cisy 333:Wireless Communications Question Paper

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