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Cork Institute of Technology
Bachelor of Science (Honours) in Software Development and Computer Networking - Stage 1
(Bachelor of Science in Software Development and Computer Networking – Stage 1)
(NFQ – Level 8)
Summer 2005
Computer Networks I
(Time: 3 Hours)
Answer Question 1 and Examiners: Dr. D. Chambers any other TWO questions Mr. E. A. Parslow Mr. P. O Connor Question 1 – 40 marks; all other questions – 30 marks Mr. J. Sherwin
Question 1:
a) What are the differences between the TCP/IP model and the OSI reference model?
(3 marks)
b) What is encapsulation? Where is it used? (2 marks)
c) Briefly describe UTP (Unshielded Twisted Pair) cable. (4 marks)
d) Give a short account of a Network Interface Card (NIC). (3 marks)
e) List 4 different types of interfaces that could be used for WAN connectivity on a router.
(4 marks)
f) Why is Ethernet described as a connectionless network architecture or a best-effort delivery system? (4 marks)
g) How is the Ethernet ‘Type’ field used? (2 marks)
h) What three actions together make up an Automatic Repeat Request (ARQ) mechanism?
(3 marks)
i) Which IP addresses cannot be assigned to hosts on any IP network that has been subnetted?
(4 marks)
j) What steps will a router take to decide what to do with a packet it has just received?
(3 marks)
k) How do routing and switching differ? (4 marks)
l) Outline any two problems that should be detected by use of a cable tester. (4 marks)
Question 2:
a) List the typical attributes of a LAN. List the typical attributes of a WAN. (5 marks)
b) Describe the functions of the Internet, Transport and Application layers of the TCP/IP reference model. (6 marks)
c) The EIA/TIA-568B structured cabling standard addresses elements of the LAN cabling process. Show with the aid of a diagram how a network installation using UTP cable would have to be laid out in order to meet the horizontal cabling component of the standard. You do not need to include any details about voice cables. (13 marks)
d) Explain the concept of microsegmentation. (6 marks)
Question 3:
a) Two communicating PCs are using CRCs to detect transmission errors. One PC has just received the bit sequence 111001101111 from the other PC. Given that the polynomial X4 + X
- 1 is being used, work out whether or not the received bit sequence contains errors. ( marks)
b) List the areas of similarity and difference between the various Ethernet technologies. (6 marks)
c) Explain the term ‘Line Encoding’ and describe the line encoding used in Standard Ethernet with the aid of a diagram. (5 marks)
d) Outline the various modes a switch can use to forward data. (9 marks)
Question 4:
a) Describe DHCP (Dynamic Host Configuration Protocol). (5 marks)
b) Describe the structure of an IP address. (5 marks)
c) Given the network address ‘172.65.0.0’, and assuming the network must be divided into 33 subnets, answer these questions: i. What class of address is this? ii. How many bits must be borrowed? iii. What is the subnet mask for this network? iv. What is the broadcast address of the first useable subnet? v. How many host addresses are available on each useable subnet? (18 marks)
d) Describe the purpose of the Protocol field of an IP datagram. ( 2marks)
