When an IPv4 packet has a TTL of 1, what will happen to it?

When an IPv4 packet has a Time to Live (TTL) value of 1, it signifies that the packet is allowed to traverse only one more hop in the network before it is dropped. TTL is a counter that is decremented by each router as the packet passes through. When the TTL reaches zero, the packet is no longer forwarded, and it is discarded. This mechanism is important for preventing infinite loops in the network, as it ensures that packets cannot circulate indefinitely.

By design, when a packet with a TTL of 1 arrives at a router, the router will decrement the TTL to zero and drop the packet. Additionally, the router typically sends an Internet Control Message Protocol (ICMP) time exceeded message back to the source to inform it that the packet could not be delivered.

The other options relate to actions that assume the packet will still be processed or forwarded in some way, which is incorrect given that a TTL of 1 will lead directly to the packet being dropped.