Which Layer of Protocol is ICMP?

Which layer of protocol is ICMP? Before understanding which layer of the ICMP protocol is, SPOTO will talk to you about the ICMP protocol –  check spoto now

What is the ICMP protocol? The full name of ICMP is Internet Control Message Protocol, which translates to Internet Control Message Protocol. It is a sub-protocol of the TCP/IP protocol suite, used to transfer control messages between IP hosts and routers. It is a connection-oriented protocol, and the control messages passed refer to the elimination of the network itself, such as the failure of the network, whether the host is reachable, whether the route is available, etc., including reporting errors, exchanging restricted control and status information. In other words, when the IP data cannot access the target, the IP router cannot forward the data packet at the current transmission rate, etc., it will automatically send an ICMP message. Although these control messages do not transmit user data, they play an important role in the transmission of user data and are of great significance to network security.

Which layer of protocol is ICMP? After understanding what the ICMP protocol is, we believe everyone knows which layer of the ICMP protocol is.In the TCP/IP model, the ICMP protocol belongs to the network layer protocol and is an important role of the network layer. It forms the network layer in the TCP/IP model together with the IP protocol, the ARP protocol, the RARP protocol and the IGMP protocol. Ping and tracert are two commonly used network management commands. Ping is used to test network reachability, and tracert is used to display the path to the destination host. Both ping and tracert use the ICMP protocol to implement network functions. They are typical examples of applying network protocols to daily network management.

ICMP uses the basic support of IP as if it is a higher-level protocol, but ICMP is actually an integral part of IP and must be implemented by each IP module.

The role of the ICMP protocol: A newly built network often requires a simple test to verify whether the network is unblocked.However, the IP protocol does not provide reliable transmission. If the packet is lost, the IP protocol cannot inform the transport layer whether the packet is lost and the reason for the packet loss. So we need a protocol to complete this function, and the protocol to complete this function is ICMP.

From a technical point of view, ICMP is an “error detection and reporting mechanism”, its purpose is to allow us to detect the network connection status, but also to ensure the accuracy of the connection. When an accident occurs while the router is processing a data packet, it can report the event to the source of the data packet through ICMP.

From this point of view, the functions of the ICMP protocol mainly include: detecting the existence of remote hosts, establishing and maintaining routing data, re-directing the data transmission path (ICMP redirection), and data flow control. In the communication of ICMP, it mainly uses different types (Type) and codes (Code) to allow the machine to identify different connection conditions

The message format of the ICMP protocol: The ICMP message is contained in the IP datagram and belongs to a user of IP. The IP header is just before the ICMP message, so an ICMP message includes IP header, ICMP header and ICMP message , The Protocol value of the IP header is 1, indicating that this is an ICMP message. The Type field in the ICMP header is used to describe the function and format of the ICMP message, and there is also a Code field for Specify the type of a certain ICMP message, all data is behind the ICMP header.

After reading this article, we believe everyone has a certain understanding of which layer of ICMP protocol and ICMP protocol. If you have any questions, please consult SPOTO! if you like it, check for more

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