COS2626 SCHOOL OF COMPUTING SUMMARY NOTES

COS2626
COMPUTER NETWORKS
STUDY NOTES,
ASSIGNMENTS 1,1,2,3
SEMESTER 1&2
EXAM PACK
2022

,8.4 Assignments
8.4.1 Assignment 01: Semester 1

Assignment 01 Semester 1
Due Date 12th March 2013
Unique Assignment number 392756
Study Material Chapters 2 - 7
Submission Procedure Mark-reading sheet or electronically via myUNISA
Number of Questions 55
Assignment Weight 40%
WARNING: IF YOU DO NOT SUBMIT THIS ASSIGNMENT YOU WILL NOT BE
ALLOWED EXAMINATION ADMISSION!

Question 1

Which one of the following statements regarding standards is INCORRECT?
1. Standards assist in network design.
2. Standards define the maximum acceptable performance of a product or service – not the
ideal.
3. Many different industries use standards to ensure that products, processes and services
suit their purposes.
4. Standards define the minimum acceptable performance of a product or service – not the
ideal.

Question 2

Study the following list of characteristics:

 Trade organization composed of representatives from United States electronics
manufacturing firms
 Sets standards for its members
 Helps write ANSI (American National Standards Institute) standards
 Lobbies for favorable computer and electronics industries legislation

These characteristics describe the organization’s standards.
1. EIA (Electronic Industries Alliance)
2. IEEE (Institute of Electrical and Electronics Engineers)
3. ITU (International Telecommunication Union)
4. ISO (International Organization for Standardization)




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, COS2626/101

Question 3

The following diagram illustrates layer functions.




1. Presentation
2. Application
3. Transport
4. Session

Question 4

The following statements describe a network address including its addressing scheme, formats
and alternate names. Which statement (s) regarding the network address is (are) INCORRECT?

a. Network addresses follow a hierarchical addressing scheme and can be assigned through
operating system software.
b. Network layer address formats differ depending on which Network layer protocol the
network uses.
c. Network addresses are also called Network layer addresses, logical addresses, or virtual
addresses.

1. only a and b
2. only b and c
3. only c
4. neither a, b nor c




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, Question 5

Suppose that, at the receiving node, a frame’s FCS (frame check sequence) doesn’t match the
FCS it was issued at the transmitting node. What happens as a result?
1. The receiving node’s Transport layer assesses the error and corrects it.
2. The transmitting node’s Data Link layer assesses the error and corrects it.
3. The receiving node’s Data Link layer requests a retransmission.
4. The transmitting node’s Transport layer immediately issues a replacement frame.

Question 6

Complete the following table by identifying the correct IEEE (Institute of Electrical and
Electronics Engineers) 802 standard.

STANDARD NAME TOPIC

A Mobile broadband Packet handling and other specifications for
wireless network multivendor, mobile high-speed wireless
transmission, nicknamed "mobile WiMAX".

B Broadband wireless The atmospheric interface and related functions
metropolitan area associated with broadband wireless connectivity;
networks also known as WiMAX.


1. 802.20; 802.16
2. 802.11; 802.22
3. 802.15; 802.12
4. 802.17; 802.22

Question 7

Given the following definitions, identify the correct property of analog signals.

a. Measure of strength at given point in time
b. Number of times amplitude cycles over fixed time
c. Distance between one peak and the next
d. Progress of wave over time compared to a fixed point

1. amplitude; frequency; wavelength; phase
2. frequency; wavelength; phase; amplitude
3. wavelength; phase; amplitude frequency
4. phase; amplitude; frequency; wavelength




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