DIT407  NETWORK SYSTEMS DESIGN AND MANAGEMENT.

UNIVERSITY EXAMINATIONS: 2018/2019
EXAMINATION FOR THE DIPLOMA IN INFORMATION
TECHNOLOGY
DIT407 NETWORK SYSTEMS DESIGN AND MANAGEMENT
FULLTIME/PARTIME
DATE: NOVEMBER, 2018 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE AND any other TWO questions.

QUESTION ONE
a) Using a diagram, describe the function of the layers in the OSI model. [10 Marks]
b) Explain any FOUR factors you would consider when selecting networking devices.
[8 Marks]
c) Explain functions of a network operating system. [4 Marks]
c) Each media type has its advantages and disadvantages. State the factors to be considered when
choosing a network media.
[4 Marks]
d) Differentiate between half duplex and full duplex communication. [4 Marks]
QUESTION TWO
a) Using a diagram, explain the fields of a frame. [10 Marks]
b) The information below shows as screenshot output with the host’s IP Address information.
Explain the meaning of the four addresses. [6 Marks]
Ethernet Adapter Local Area Connection:
Connection-specific DNS Suffix:
IP Address…..: 192.168.1.2
Subnet Mask…..: 255.255.255.0
Default Gateway…..: 192.168.1.254
c) Network administrators should plan and document the allocation of these addresses inside the
networks. Explain why this is important. [4 Marks]
QUESTION THREE
a) Describe the following Data link layer sublayers [6 Marks]
i Logical Link Control
ii Media Access Control

b) Distinguish between Cut-through and Store-and-forward switching techniques.
[4 Marks]
c) Explain how the following ports of a communication device are used:
i. Console port
ii. LAN port [2 Marks]
d) Discuss the following techniques of network design:
i. Scalability
ii. Partitioning
iii. Replication [3 Marks]
e) Outline the three levels of an enterprise network. [5 Marks].
QUESTION FOUR
a) You have been provided with the following Network Address: 192.168.100.66/27
i. What is the Subnet Mask? [2 Marks]
ii. What is the Broadcast? [2 Marks]
iii. How many subnets are available? [2 Marks]
iv. What are the Valid Hosts for the Subnet that the Network Address belongs to? [2 Marks]
b) Explain how a DHCP Server assigns IP Addresses while avoiding conflicts. [6 Marks]
c) Explain why it is important to backup a network and highlight three basic methods of Network
Backup. [6 Marks]
QUESTION FIVE
a) List FOUR examples of network operating systems. [2 Marks]
b) Explain functions of a network operating system. [4 Marks]
c) To provide security, a network manager must address two areas. State the two areas.
[4 Marks]
d) Explain TWO ways to prevent Denial of Service Attacks. [4 Marks]
e) Give THREE reasons why you would choose a Linux platform for Network Administration
over a Microsoft Windows Server platform. [6 Marks]

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