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Internet Technology Question Paper
Internet Technology
Course:Bachelor Of Science In Information Technology
Institution: Kca University question papers
Exam Year:2009
UNIVERSITY EXAMINATIONS: 2009/2010
FIRST YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 1107: INTERNET TECHNOLOGY
DATE: DECEMBER 2009 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions
QUESTION ONE: [30 MARKS]
(a) Define the following:
(i) Throughput. [2 Marks]
(ii) Information Highway. [2 Marks]
(iii) The Internet. [2 Marks]
(iv) Internet Protocol. [2 Marks]
(b) (i) What functions does a modem provide? [2 Marks]
(ii) What is a communications medium? Give two examples of a physical communications medium
that Ethernet can run over. [4 Marks]
(iii) Which Standards Organization developed the OSI (Open Systems Interconnections) Model?
[2 Marks]
(iv) What are the responsibilities outlined in the Physical Layer of the OSI model? [2 Marks]
(v) What is the significance of the Data Link Layer of the OSI model? [2 Marks]
(c) (i) What is the difference between persistent HTTP with pipelining and persistent HTTP without
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pipelining? Which of the two is used by HTTP/1.1? [4 Marks]
(ii) Why is it said that FTP sends control information "out of band"? [2 Marks]
(iii) Suppose that you send an e-mail message whose only data is a Microsoft Excel attachment.
What might the header lines (including MIME lines) look like? [2 Marks]
(iv) From a user''s perspective, what is the difference between the download-and-delete mode
and the download-and-keep mode in POP3? [2 Marks]
QUESTION TWO: [20 MARKS]
a) It has been said that flow control and congestion control are equivalent. Is this true for the
Internet''s connection-oriented service? Are the objectives of flow control and congestion control
the same? Explain. [6 Marks]
b) (i) It is said that UDP is a connectionless protocol. Explain. [4 Marks]
(ii) List two applications that make use TCP and two that make use of UDP. [4 Marks]
(iii) Explain the meaning of a Handshaking protocol. Give an example of two such protocols.
[6 Marks]
QUESTION THREE: [20 MARKS]
a) (i) Dial-up modems, ISDN, HFC and ADSL are all used for residential access. For each of these
access technologies, provide a range of transmission rates and comment on whether the
bandwidth is shared or dedicated. [4 Marks]
(ii) Consider sending a series of packets from a sending host to a receiving host over a fixed route.
List the delay components in the end-to-end delay for a single packet. Which of these delays
are variable and which are fixed? [6 Marks]
b) Discuss IPv6 in detail, under the following fields:
(i) Version [2 Marks]
(ii) Priority [2 Marks]
(iii) Flow Label [2 Marks]
(iv) Payload Length [2 Marks]
(v) Data [2 Marks]\
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QUESTION FOUR: [20 MARKS]
(a) (i) It has been said that IPv6 tunnels through IPv4 routers; IPV6 treats the IPv4 tunnels as link
layer protocols. Do you agree with this statement? Why or why not? [4 Marks]
(ii) There are some of possible services that a link-layer protocol can offer to the network layer.
Explain any four of them. Which of these link-layer services have corresponding services in IP?
In TCP? [6 Marks]
(b) (i) If all the links in the Internet were to provide the reliable-delivery service, would the TCP
reliable delivery service be completely redundant? Why or why not? [5 Marks]
(ii) What is the difference between end-to-end delay and delay jitter? What are the causes of delay
jitter? [5 Marks]
QUESTION FIVE: [20 MARKS]
a) Why is a packet that is received after its scheduled playout time considered lost? [2 Marks]
b) The following are some of the common attacks on the Internet infrastructure. Describe each one of
them.
(i) Spyware: [2 Marks]
(ii) Virus [2 Marks]
(iii) Worm: [2 Marks]
c) (i) Differentiate between Circuit switching and Packet Switching, giving pros and cons of each.
[4 Marks]
(ii) Suppose you are an application developer, explain why you may choose to run your
application over UDP rather than TCP. [4 Marks]
(iii) Explain the term Web cache (proxy server) [4 Marks]
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