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Comp 461: Internet Working And Tcp/Ip Question Paper

Comp 461: Internet Working And Tcp/Ip

Course:Bachelor Of Computer Science

Institution: Kabarak University question papers

Exam Year:2009

COURSE CODE: COMP 461
COURSE TITLE: INTERNET WORKING AND TCP/IP
STREAM: Y4S2

INSTRUCTIONS:
SECTION A ANSWER ALL QUESTIONS IN THIS SECTION
SECTION B ANSWER ANY TWO QUESTIONS IN THIS SECTION

QUESTION ONE (30 MARKS)
a)
i). What is internetworking? [2 marks]
ii). Internetworking evolved as a solution to three key problems explain these
problems [6 marks]
b) With aid of a diagram illustrate how the internet protocols span over the complete range
of OSI model [10 marks]
c)
i). Distinguish between connectionless and connection oriented transport protocols
giving an example of a protocol in each case [4 marks]
ii). Explain the role of internetwork addresses [2 marks]
iii). Identify THREE commonly used internetwork addresses and explain the role of
each in an internetwork [6 marks]

SECTION B ANSWER ANY TWO QUESTIONS IN THIS SECTION
QUESTION TWO (20 MARKS)
a)
i). Explain how the router uses the subnet mask to determine the network number
[4 marks]
ii). Given the subnet mask 255.255.248.0 compute the following Cleary showing
your working
I. Sub network numbers for computers with the destination IP address
172.32.24.16 and 172.32.36.12 [4 marks]
II. Number of bits for subletting [2 marks]
III. Number of subnets [2 marks]
IV. Number of hosts [2 marks]

b) For two computers in a network to communicate they must know each other machines
physical address explain how this is done [3marks]
c) State any THREE benefits of sub netting [3 marks]

QUESTION THREE (20 MARKS)
a) Explain the meaning of the following statement
i). IP routing is dynamic [3 marks]
ii). IP datagram travel through the internetworks one hop at a time [4 marks]
b)
i). How does dynamic routing contrast with static routing [4 marks]
ii). Explain how hosts in an internetwork discovers the addresses of routers on
directly attached subnets [4 marks]
c) A host named dina wishes to communicate to neon both hosts are on different subnets
directly attached to router R1. Dina uses router R2 which is neither directly attached to it
nor to neon to pass a message to neon. Explain how R2 will react and why. [5 marks]

QUESTION FOUR (20 MARKS)
a)
i). Explain the purpose of the Time-to-live (TTL) field in a data packet [3 marks]
ii). How does the internet control message protocol (ICMP) make use of TTL?
[2 marks]
b)
i). Describe TWO methods used by TCP to implement reliability and flow control
technique [8 marks]
ii). Contrast the two methods described above [2 marks]

c) Software application in System A has information to transmit to a software application in
System B. Explain how this information will pass through the OSI layers of the two
systems to the user of system B. [5 marks]

QUESTION FIVE (20 MARKS)
a) Using an appropriate example explain how you can determine whether two computers are
local or remote to each other in a network [3 marks]

b) Discuss 4 challenges to Internetworking [7 marks]

c) Explain how you can test whether a computer is communicating with other computers on the
network [2 marks]

d) Your computer is not communicating with other computers on the network and you need to
view the IP address information outline two methods that you can use to view this
information and for each method, you can do [3 marks ]

e) Identify THREE elements that make up a socket and explain the use of a socket to TCP/IP
[5 marks]

Comp 461: Internet Working And Tcp/Ip Question Paper

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