COMPUTER NETWORKING & MANAGement
Task 1 – 15 Marks
Table 1 below, gives the round-trip time (RTT) for 30 individual segments sent over a TCP
Segment 1 2 3 4 5 6 7 8 9 10
RTT (ms) 130 138 122 124 131 139 139 121 134 127
Segment 11 12 13 14 15 16 17 18 19 20
RTT (ms) 267 139 126 134 141 137 291 123 134 139
Segment 21 22 23 24 25 26 27 28 29 30
RTT (ms) 141 142 139 122 123 143 215 134 122 134
For each segment, making any necessary assumptions, calculate the following and plot the data
on a graph:
The exponentially weighted moving average (EWMA) of RTT (sometimes referred to as
The variability of RTT (sometimes referred to as DevRTT).
An appropriate timeout internal for use when transmitting the next TCP segment.
For the connection data given in Table 1, using your assumptions, determine if premature
timeout will occur for any of the segments. If so, which?
Task 2 – 5 Marks
A small office / home office (SOHO) LAN has six workstations, connected together via Ethernet.
This small network is connected to the Internet via a network address translation (NAT) enabled
Explain the operation of the NAT enabled router and critically appraise this arrangement.
Explain how the workstations may obtain their IP addresses.
Explain how the router may obtain the IP address for its Internet interface.
Computer Networking & Management September 2009 Final
©NCC Education 2009
Task 3 – 10 Marks
Discuss the following terms as applied to the HTTP and explain how each can provide
performance improvements to HTTP applications:
Conditional GET / client caching
Outline THREE different Internet protocols commonly used to retrieve mail from mail servers
by e-mail user agents. Compare and contrast these.
Task 4 – 10 Marks
Explain how the Integrated Services (Intserv) architecture allows an Internet connection to have
a guaranteed Quality of Services (QoS).
Explain how the Differentiated Services (Diffserv) architecture allows an Internet connection to
have a differentiated QoS.
Explain why it is likely to be difficult to implement Intserv in the core of the Internet.
Task 5 – 60 Marks
Using available Internet and library resources, research the provisions of the ISO standard 17799:
2005 – code of Practice for Information Security Management.
Outline the eleven Security CLAUSES and CONTROL OBJECTIVES of the standard in an
appropriate format. (Approximately 1000 and 1500 words respectively - overall total 2500
For each of the clauses, critically appraise how the main control objectives relate to an
organisation with which you are familiar. Also, briefly outline what would be required to enable
the organisation to meet the objectives. (Approximately 2000 words).
NOTE: Just copying information from websites without individual interpretation or comments
is discouraged and will not gain marks. Also, see notes on plagiarism on the front cover of this
A single word processed document containing all reports and other documentation i.e. explanations,
output reports and page images of graphic tools etc. pertaining to all tasks.
Maximum word limit is 7000 words (+/- 10%) not including the appendices.
The document should be properly structured with a table of contents, bibliography (online and
literature sources) and appendices (where necessary). Refer to the Assignment Presentation
Requirements on Campus for more information. (See front cover).
Produce clear and specific reasoning and argument to justify answers.
Include screen dumps for all your practical work.
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