| Exam 200-301 | Question id=5298 | Network Fundamentals |
When a packet is forwarded through a network from one host to another host, which of the following fields in the Ethernet frame will change at every hop?
| A. |
Source IP address | |
| B. |
Destination MAC address | |
| C. |
Source port number | |
| D. |
Destination IP address |
When an Ethernet frame is forwarded through the network, both the source and destination MAC addresses will change at every hop.
The source and destination IP addresses and source and destination port numbers MUST remain the same for proper routing to occur, for the proper delivery to the destination service, and for the proper reception of responses to the sending device. By contrast, the MAC addresses used at each hop must be those of the physical interfaces involved in the Layer 2 forwarding at each hop.