If the sending host does not do MTU discovery,the largest packet it can send is ________.
A)1,280 octets
B)65,536 octets
C)65,536 octets minus the 40 octets of the main headers
D)None of the above. The sending host must do MTU discovery.

Question

Quizplus · Accepted Answer

If the sending host does not do MTU discovery, it cannot determine the maximum transmission unit (MTU) size of the path. As a result, it will default to using the Ethernet MTU of 1500 bytes. However, this includes 20 bytes for the IP header and 8 bytes for the ICMP header, leaving a maximum payload size of 1472 bytes. To calculate the total packet size, we add the 18 bytes of Ethernet header and trailer, giving us a maximum packet size of 1490 bytes. Using this calculation, we arrive at option A as the correct answer.

If the Sending Host Does Not Do MTU Discovery,the Largest