Consider the following network: A ------- R1 -------- R2 ------ B. Host A IP Add

Question

Consider the following network: A ------- R1 -------- R2 ------ B. Host A IP Address: 192.168.1.10 Host A MAC Address of its interface: 00-11-22-33-44-55 Router R1 IP address of left interface: 192.168.1.1 Router R1 MAC Address of left interface: aa-bb-cc-dd-ee-ff Host B IP address: 10.1.1.1 Host B MAC Address of its interface: 22-33-44-55-66-77 Host A sends an IP datagram to Host B. The datagram is encapsulated inside an Ethernet frame and sent to router R1. What source MAC address and destination MAC address will A put in the header of the Ethernet frame? What source IP address and destination IP address will A put in the header of the IP datagram?

Explanation / Answer

Source MAC address: 00-11-22-33-44-55 and

Destination MAC address: aa-bb-cc-dd-ee-ff will be kept by A.

And in the case of IP Addresses...

Source IP address: 192.168.1.10

Destination IP address: 10.1.1.1     

are as above.

This is because of ARP request sent by A to R1 and the response would be the MAC of R1 by which the load is added to the packet by A. After the packet reaches R1 the ARP load is striped off and Routing takes place.

Hope this helps.

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