Answer ALL questions. Clearly cross out surplus answers.
Time: 2 hours
Any reference material brought into the examination room must be handed to the invigilator before the start of the examination.
ANSWER ALL QUESTIONS
Marks QUESTION 1
a) State FOUR (4) principles underpinning the Open Systems Interconnection (OSI) Reference Model. b) Describe the purpose of the physical layer of the OSI Reference Model. c) State THREE (3) elements of network design that relate to the physical layer of the OSI Reference Model. d) Describe the purpose of the data link layer.
4 1 3
2 Total 10 Marks
QUESTION 2 a) b) c) d)
Define the term a packet as used in computer networks. Briefly describe the THREE (3) key components of a packet. Explain the difference between a LAN, MAN and WAN. Describe how signal reflection could be a problem in an Ethernet LAN and explain how this is prevented.
1 3 3 3
Total 10 Marks QUESTION 3 a) b) c) d)
Explain why wireless technology was not initially widely adopted. State THREE (3) advantages to using wireless peripheral devices. Describe what a wireless adapter is. Describe what an access point is.
3 3 2 2 Total 10 Marks
QUESTION 4 a) b) c) d)
Explain what physical topology is. Explain what logical topology is. Describe how physical topology and logical topology relate to each other. Describe how point to point networks operate.
2 2 2 4 Total 10 Marks
QUESTION 5 a) b) c)
State FIVE (5) factors to consider when choosing physical media for a computer network. State FOUR (4) advantages to using fibre-optic cable as a network medium. State the main disadvantage to using fibre-optic cable as a network medium.
5 4 1 Total 10 Marks
QUESTIONS CONTINUE ON NEXT PAGE Page 2 of 3
Computer Networks March 2012 Formatted/HW © NCC Education Ltd 2012
Marks QUESTION 6 a) b)
Explain what a repeater is and briefly describe how it works. Explain what a...