DNF401  VOICE CONVERGENCE NETWORKS .

UNIVERSITY EXAMINATIONS: 2015/2016
EXAMINATION FOR THE DIPLOMA IN BUSINESS/ INFORMATION
TECHNOLOGY/NETWORK FORENSIC
DNF401 VOICE CONVERGENCE NETWORKS
DATE: AUGUST 2016 TIME: 1½HOURS
INSTRUCTIONS: Answer Any THREE Questions.

QUESTION ONE
a) Now more than ever, an organization’s ability to enable effective, real-time communication
and collaboration between employees, customers and business partners cannot be over
emphasised. Many products and services have taken advantage of technological
convergence to remain competitive in this fierce market place. Explain five such products
and services. (10 Marks)
b) Outline GPRS goals (6 Marks)
c) briefly explain the four H.323 components (4 Marks)
QUESTION TWO
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
a) There are different types of delay from source to destination. Explain the four types of delay
that make up end-to end delay (8 Marks)
b) Explain 4 ways in which the delays above can be reduced (8 Marks)
c) Define the following terms (4 Marks)
i. SIP
ii. SAP
QUESTION FOUR
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. FIFO
ii. PQ
iii. CQ
iv. WFQ
v. CBWFQ
c) Explain the steps taken in implementing QOS (3 Marks)
d) Discuss the key voice-over-IP requirements (4 Marks)
QUESTION FIVE
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 following power backup technologies (4 Marks)
i. Power over Ethernet (PoE)
ii. Uninterruptible Power Supply (UPS)
3
c) There are several voice digitization standards and some proprietary techniques in use for
VoIP transmission. Explain any Five ITU standards (5 Marks)
d) List down any H.323 and SIP support protocols (3 Marks)

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