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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Once received by R2, the TTL value is 1, it then subtracts and hit zero. Because of this it will not forward the packet and therefore R2 will send the response saying time exceeded
C and E are correct. Each router reduces TTL and forwards the packet, R3 receives a TTL 0 and responds.
TTL is decremented by 1 at each L3-forwarding host until 0