“In the above diagram, PC1 pings PC2. An IP header with the source and destination IP
address as 192.168.1.2 and 192.168.1.3 is created. PC1 sends an ARP request frame to

find the mac-address of PC2. This is required to construct the ethernet frame to

encapsulate the IP packet. After the mac-address of PC2 is received, the frame is

constructed and the IP packet encapsulated. The frame is sent to the switch and is received

on port on E0. The switch looks into the destination mac-address in the frame, which is

PC2’s mac-address and checks if the entry is available in it’s mac-address table. If yes, the

frame is forwarded to the port on which PC2 is connected. If unavailable, the switch

floods the frame to all ports. After PC2, receives the frame, it looks into the destination

mac-address to check if the frame is intended for itself. Once verified, the destination IP

address is verified with it’s own IP address. As it is a match, the ping packet is processed

and the response to the ping packet created. The response packet would contain the source

IP address as 192.168.1.3 and the destination IP address as 192.168.1.2, and a new frame

would be created with the source and destination mac-address as PC2 and PC1

respectively.”