Which layer is icmp
Network layer. icmp belongs to the network layer protocol. icmp is an acronym for “InternetControlMessageProtocol”. it is a sub-protocol of the TCP/IP family of protocols used to pass control messages between IP hosts and routers. It is a sub-protocol of the TCP/IP family of protocols and is used to pass control messages between IP hosts and routers. Control messages are messages about the network itself such as whether the network is passable or not, whether hosts are reachable or not, whether routes are available or not.
Network layer: ICMP is a network layer protocol, which stands for “Internet Control Message Protocol”. It is a sub-protocol of the TCP/IP family of protocols and is used to pass control messages between IP hosts and routers. Control messages are messages about the network itself, such as whether the network is passable or not, whether hosts are reachable or not, whether routes are available or not. These control messages do not transmit user data, but they play an important role in the transmission of user data.
What is icmp protocol
ICMP (InternetControlMessageProtocol) Internet Control Message Protocol. It is a sub-protocol of the TCP/IP protocol cluster and is used to transfer control messages between IP hosts and routers, including reporting errors, exchanging restricted control and status information, etc. It belongs to the network layer protocol. ICMP messages are automatically sent when a situation is encountered such as IP data cannot access the target, IP router cannot forward packets at the current transmission rate, and so on. We can use the Ping command to send ICMP response request messages and record the receipt of ICMP response reply messages, through which we can provide a reference basis for network or host failure.