(b) In the context of an Ethernet Local Area Network, describe the role of the MAC Address
Table in a switch. Explain how it is dynamically updated.
(c) Consider the OSI 7 layer model.
(i) Name layers 1, 2, 3 and 4 of the OSI model.
[10 marks]
(ii) Name the Protocol Data Units used in layers 1, 2, 3 and 4 of the OSI model.
(iii) Describe the mapping between the layers of the OSI model and the TCP/IP model.
(d) Briefly explain the purpose of the DHCP protocol.
[10 marks]
(i) Give three configuration parameters that a host can obtain using this protocol.
(ii) What IP address does a client use when locating available DHCP servers?
(iii) A client initiates a DHCPDiscover to locate a DHCP server. One DHCP server's
configuration is selected, a second DHCP server's configuration is not selected.
Fill-in the blank DHCP Message Sequence Chart in Fig. 1 in your exam script
to illustrate how the client acquires all IP configuration parameters through the
exchange with the DHCP servers. Illustrate all four DHCP messages used to
complete this process.
Server
not selected
Client
Server
selected
Begin initialization
Initialization complete
Figure 1: DHCP Message Sequence Chart
