Refer to the exhibit.
What will Router1 do when it receives the data frame shown? (Choose three.)
A.
Router1 will strip off the source MAC address and replace it with the MAC address
0000.0c36.6965.
B.
Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1.
C.
Router1 will strip off the destination MAC address and replace it with the MAC address
0000.0c07.4320.
D.
Router1 will strip off the destination IP address and replace it with the IP address of
192.168.40.1.
E.
Router1 will forward the data packet out interface FastEthernet0/1.
F.
Router1 will forward the data packet out interface FastEthernet0/2.
Explanation:
Remember, the source and destination MAC changes as each router hop along with
the TTL being decremented but the source and destination IP address remain the same from
source to destination.
Answer: A C F
Explanation
The “Age” field in the “show ip arp” command is the age in minutes of the cache entry. A hyphen (-) means the address is local so in this case 192.168.20.1, 192.168.40.1 & 192.168.60.1 are local to this router.
From the “Data Frame”, we learn that a packet is sent to Router1 and Router1 needs to forward it to the Destination IP 192.168.40.5. Therefore this router will:
+ Strip off the source MAC address and replace it with the MAC address 0000.0c36.6965 (because the IP address of this interface – 192.168.40.1 is in the same subnet with the Destination IP 192.138.40.5).
+ Strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320, which is the MAC of Destination host.
+ Forward the data packet out interface FastEthemet0/2 because this interface has the IP address of 192.168.40.1.
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thanks for your explanation, i got the point from your answer
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correct….thanks buddy.
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