Exercise 1
List here the IP and MAC addresses for the 3 PCs:
Host IP Address
PC 1 192.168.1.1
MAC address
PC 2 192.168.1.2
PC 3 192.168.1.3
On one of the PCs, identify a captured message that illustrates the “shared medium” operation of the Hub. Justify the choice, identify the PC on which you are making this observation, and list the source & destination addresses in the message.
Observe the packet header details window. Report the number of bytes in the frame (“bytes on wire”) and find the number of Header bytes added by each layer. Show the breakdown of the number of bytes in the frame, by listing the payload and all headers and their length in bytes.
Number of bytes in frame
MAC Header fields SA, DA, L/T (bytes)
IP Header Length in bytes
ICMP Header length in bytes
ICMP Payload

Exercise 2
Explain the difference between the observed messages in this test and in exercise 1.
Effect of payload size
Calculate the size of the total payload that must be carried by the Ethernet LAN in each case, taking into account the IP and ICMP headers.
Size of payload for 1472 bytes ping
Size of payload for 1473 bytes ping
Observe the messages captured by Wireshark for each of the 2 requests (ping 1472 and ping
1473), and explain how many frames are used in each case. Give the size of the frames.
1472 bytes ping:
frame of size
1473 bytes ping:
frame of size
frame of size
Find an example of such padded frame in the captured results. Explain how much padding has been added to this frame.
Exercise 3 :
Explain how the switch uses the Source Address and the Destination Address contained in an
Ethernet frame.