Jan 9, 2017 · Yesterday an interviewer asked me what the port number for ping is and which protocol ping uses: TCP or UDP. After the interview, I searched on the Internet and found …

Sep 25, 2017 · But can someon explain why specifically TCP/UDP port 7. What exactly is the firewall rule? ICMP has no ports and is neither TCP nor UDP. ICMP is IP protocol 1 (see …

Nov 2, 2018 · Port numbers are transport-layer addresses used by some transport protocols. The purpose of the transport addresses (ports) is to allow multiple processes to simultaneously use …

As ICMP works directly over IP layer, it does not carry any TCP/UDP ports, however, we can still issue ping and traceroute commands using different port numbers. I can understand that the …

Mar 7, 2018 · I'm just wondering, is there a port number used for the ping command. I have dissected the ping packet on Wireshark, but I haven't seen any destination or source ports. …

Apr 17, 2021 · Are there any other causes, apart from the specific port to be reached being closed, that can lead to an ICMP Destination unreachable - Port unreachable message? What …

Oct 11, 2019 · From ICMP RFC 792: If, in the destination host, the IP module cannot deliver the datagram because the indicated protocol module or process port is not active, the destination …

ICMP echo reply Port? Hi everyone, There is a lot of debate on the Internet regarding ICMP being layer 3 or layer 4, as supposedly it uses port 7 for the latter as an echo reply (I did see …

Jan 21, 2022 · Understanding ICMP Protocol with Wireshark in Real Time • Questions: • What is the MTU size of the ICMP packet at the Network Layer? • What is the MTU size of the ICMP …

Aug 25, 2005 · ICMP (ping, trace)is a layer 3 protocol suite within the TCP/IP suite, doesnt test any layer 4 or above functions, therefore, it has no TCP/UDP layer 4 port number. The sub …