DNF401  VOICE CONVERGENCE NETWORKS.

UNIVERSITY EXAMINATIONS: 2016/2017
EXAMINATION FOR THE DIPLOMA IN NETWORK FORENSICS
AND COMPUTER SECURITY
DNF401 VOICE CONVERGENCE NETWORKS
DATE: AUGUST, 2017 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions.

QUESTION ONE (30 MARKS) – COMPULSORY
a) Outline GPRS goals (6 Marks)
b) Briefly explain the four H.323 components (4 Marks)
c) Explain the key voice-over-IP requirements. (10 Marks)
d) Explain what you understand by the term convergence and the advantages that come
with it. (5 Marks)
e) Outline FIVE activities performed by SIP protocol. (5 Marks)
QUESTION TWO (20 MARKS)
a) Compare and contrast H.323 and SIP protocols (10 Marks)
b) “Quality of Service” is a means to prioritize network traffic, to help ensure that the
most important data gets through the network as quickly as possible. Identify the
major quality issues with converged networks.
(5 Marks)
c) Outline QOS benefits. (5 Marks)
QUESTION THREE (20 MARKS)
a) Explain four ways in which delays can be reduced. (8 Marks)
b) Define the following terms (4 Marks)
i. SIP
ii. SAP
c) Explain four advantages and four disadvantages of convergence. (8 Marks)
QUESTION FOUR (20 MARKS)
a) AAAS WIN is a design to provide ubiquitous wireless network access, in your own
words explain its objectives (8 Marks)
b) Network elements handle an overflow of arriving traffic by use of a queuing algorithm to
sort the traffic and then determine some method of prioritizing it onto an output link.
Explain the following queuing tools: (5 Marks)

i. First-in, first-out (FIFO) queuing
ii. Priority queuing (PQ)
iii. Custom queuing (CQ)
iv. Flow-based weighted fair queuing (FBWFQ)
v. Class-based weighted fair queuing (CBWFQ)
c) Explain the steps taken in implementing QOS (3 Marks)
d) Discuss the advantages that come with convergence. (4 Marks)
QUESTION FIVE (20 MARKS)
a) The company where you work intends to deploy voice-over-IP in the offices. You have
been asked to help decide how each employee will be connected to the voice-over-IP
provider. Explain any four choices on the market today. (8 Marks)
b) Explain the power backup technologies available today. (4 Marks)
c) There are several voice digitization standards and some proprietary techniques in use for
VoIP transmission. Explain any three ITU standards (3 Marks)
d) List down any H.323 and SIP support protocols (3 Marks)
e) Define the term convergence (2 Marks)

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