• a. Identify which of the following statements are correct and which are not correct. Write a correct alternative statement for those which are not correct.

  • I. it is more expensive to install fibre-optic cable because specialist training is necessary
  • ii. routers are used to connect subnets on a LAN
  • iii. all traffic in a subnet passes through the default gateway
  • iv. a layer 3 switch provides routing using MAC addresses
  • v. computers and/or other devices that are networked in a single physical location are said to form a wide area network.

  (8 marks)

• b. With the aid of a table similar to Table 1, indicate at which layer number and layer name of the OSI model the protocols ATM, DNS, IP and UDP would be found.

  (4 marks)

Table 1

Layer number	Layer name	Protocol

• c. What is the network ID of the host with an IPv4 address 192.88.77.150 with a subnet mask of 255.255.255.224?