Do the source and destination MAC/IP addresses change when a packet traverses a bridge? Provide an explanation and include an example from the captured data. Suppose that PC2 was configured as an IP router, which differences would you observe in the Ethernet and IP headers?

What will be an ideal response?

No. From the above captured data we note that the source & destination MAC/IP do not change when a packet traverses a bridge. The bridge, PC2, just forwards the ping request that it receives from PC1 on its other port. Similarly the ping response received from PC3 is forwarded to PC1. If PC2 is configured as a router, for the above scenario, assuming that it has been configured to forward
packets received from the subnet SN1 on which PC1 is a host to subnet SN2 with PC3 as host. When PC2 received the ARP request from PC1 it would determine that the packet has to be forwarded to SN2. Hence it creates an ARP request packet with source MAC address as the MAC address of its interface connected to SN2 and sends the request. It handles the ARP response similarly. Thus the Ethernet addresses of the packets would be modified but IP addresses remain unchanged.