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Networking 2 Question Paper

Networking 2

Course:Bachelor Of Business Information Technology

Institution: Strathmore University question papers

Exam Year:2010

FACULTY OF INFORMATION TECHNOLOGY
BBT 3204 – NETWORKING 2 (EC)

April, 2010 Time: 2 hours
Instructions: Answer question 1 and any other two questions. All questions carry equal marks (20

Question One
a) Consider the network 203.187.152.0 255.255.248.0 . If the network runs a link-state routing protocol, what update will A
create and send? To whom? Which nodes in the network will receive this update?
(4 marks)
b) If the same network runs a distance vector protocol, what is the first update that A will send? To
whom? What will the final update contain?
(4 marks)
c) Consider a router in an IP network with the following table:
SubnetNumber SubnetMask NextHop
203.187.152.0 255.255.248.0 Intface 0
203.187.128.0 255.255.252.0 R2
203.96.0.0 255.255.192.0 R3
203.187.130.0 255.255.254.0 R5
Default R4
2
Find the next hops for the following IP addresses:
I. 203.187.131.25
II. 203.96.130.186
III. 203.187.155.138
IV. 203.96.16.234
V. 203.187.129.146
(5 marks)
d) Discuss the workings of pure ALOHA and slotted ALOHA and identify the advantage if any, of
pure ALOHA over slotted ALOHA
(4 marks)
e) BGP is a path vector protocol. How is this different from the distance vector protocol? What are the
disadvantages of this protocol? Why is it chosen for BGP despite this?
(3 marks)

Question Two
a) Availability and cost effectiveness are two of several technical goals to consider when designing a
computer network. Based on these two goals the network design must be a trade-off. Comment.
(3 marks)
b) Define network management and identify five functions that can be performed by a network
management system.
(7 marks)
c) Shah's manufacturing is a medium-sized manufacturing company that has a network of 8 LANs
connected via a 100Base T Hub. The hubs are connected to a core optical fiber switch to form a
collapsed backbone network. The core switch is then connected to the local ISP using a 1 Mb/s
leased line (also called a fractional E1 line). Most of the computers are used for order processing
and standard office applications, but some control the manufacturing equipment in the plant. Some
of the devices on the network are not SNMP-capable. The network is working well and there has
been no major problem but Shah is wondering whether he needs to invest in network management
software as his IT consultant advised him. It will cost about $5000 to replace the current hardware
with SNMP- capable hardware. Shah could also purchase SNMP device management software for
$2000 or spend $7000 to buy SNMP system management software.
i. Draw a diagram of Shah's manufacturing network showing all the devices required in the
network and that might need to be managed
(5 marks)
ii. Should Shah install SNMP software and if so, which software should he buy? Explain
(5 marks)

Question Three
a) Briefly describe three advantages and three disadvantages of network address translation.
(6 marks)
b) Interior Gateway Routing Protocol (IGRP) is said to be an Interior Gateway Protocol.
3
i. State four differences between a distance vector routing protocol, such as IGRP, and a link state
routing protocol.
(4 marks)
ii. State two ways in which link state routing attempts to reduce network load.
(2 marks)
iii. Define a link state packet
(1 mark)
iv. Discuss how SIP is used in the transmission of multimedia
(7 marks)

Question Four
a) In the diagram below, Router C is running OSPF as the routing protocol. Determine the following
based on the information provided in the diagram.
i. The link state (or topology) database of router C
(5 marks)
ii. With C as the root node, determine Dijkstra's computation for Router C
(5 marks)
iii. What is the major difference between Integrated Services (IntServ) and Differentiated Services
(DiffServ)?
(2 marks)
iv. An output interface in a switch is designed using the leaky bucket algorithm to send 8000
bytes/tick. If the following frames are received in sequence, show the frames that are sent
during each second
Frames 1, 2, 3, 4: 4000 bytes each
Frames 5, 6, 7: 3200 bytes each
Frames 8, 9: 400 bytes each
Frames 10, 11, 12: 2000 bytes each
(8 marks)

Question Five
Implementing a large collapsed backbone network design local area network requires the use of active
devices such as hubs, switches, and routers in addition to structured cabling
i. Draw a diagram showing how each of the active network devices is used in a typical LAN
(4 marks)
ii. Distinguish the 2 active devices in part a (switch and router) in terms of the protocol layers that
4
they implement in a TCP/IP network.
(2 marks)
iii. Suppose the local network sketched in Part I only contains three networks – Net 1, Net 2 and
Net 3 WAN connecting an ISP using a PPP dial up link. Net 1 uses 100BaseT Ethernet, Net 2 is a Wi-Fi
network and Net 3 is the WAN. Suppose the network manager has assigned the networks the following
IP address prefixes 192.170.240.0/24 (Net 1), 203.240.140.0/28, 197.100.160.0/28, all using the CIDR
notation. Assign possible IP addresses to the two routers used to connect the Intenret.
(4 marks)
iv. Discuss the difference between iterative and recursive resolution in DNS. Include the diagrams.
(10 marks)

Networking 2 Question Paper

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