COS Assignment 4 (Distinction Guaranteed)

Computer Networks I
COS2626


2022
Assignment 4
Unique Number: 879271


School of Computing

, Question 1 [7]

The following questions are based on the OSI (Open Systems Interconnection) Model.

1.1 List TWO protocols that function at the Transport layer of the OSI model. What kind [3]
of information do these protocols add to their headers to create a message ready to
be handed down to the network layer?
1.2 At the Network layer, how are the sending and receiving hosts identified? [1]
1.3 Which Application layer protocol can be used to monitor and gather information [1]
about network traffic and alert network administrators about adverse conditions that
need attention?
1.4 A computer is unable to access the network. When you check the LED (Light Emitting [1]
Diode) lights near the computer’s network port, you discover the lights are not lit.
Which layer of the OSI model will you use to troubleshoot this problem?
1.5 The PDU (Protocol Data Unit) for the Data link layer of the OSI model is a . [1]


1.1 TCP (segment) and UDP (datagram)

1.2 IP addresses

1.3 SNMP (Simple Network Management Protocol)

1.4 Physical layer

1.5 Frame