In Cisco routers, the codes for a traceroute command reply are: ! - success * - time out N - network unreachable H - host unreachable P - protocol unreachable A - admin denied Q - source quench received (congestion) ? - unknown (any other ICMP message)In Cisco routers, the codes for a traceroute command reply are: ! - success * - time out N - network unreachable H - host unreachable P - protocol unreachable A - admin denied Q - source quench received (congestion) ? - unknown (any other ICMP message)