What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?

What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?

  • It checks the value of the TTL field and if it is 0, it discards the packet and sends a Destination Unreachable message to the source host.
  • It checks the value of the TTL field and if it is 100, it discards the packet and sends a Destination Unreachable message to the source host.
  • It decrements the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host.
  • It increments the value of the TTL field by 1 and if the result is 100, it discards the packet and sends a Parameter Problem message to the source host.
    Answers Explanation & Hints:

    To prevent an IPv4 packet to travel in the network endlessly, TCP/IP protocols use ICMPv4 protocol to provide feedback about issues. When a router receives a packet and decrements the TTL field in the IPv4 packet by 1 and if the result is zero, it discards the packet and sends a Time Exceeded message to the source host.

Leave a comment