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What are the two types of ICMP message?
Ping: Echo Request and Reply—Types 8 and 0 We discuss the ICMP Echo Request Type 8 and Echo Reply Type 0 because ICMP uses these messages in tandem. Remote hosts use these two message types to test connectivity. Assume the end host works through the Network layer.
How many categories are there in ICMP messages?
ICMP (Internet Control Message Protocol) Message Format So far you learned about 2 types of messages sent by ICMP.
Is ICMP a UDP?
Unlike the Internet Protocol (IP), ICMP is not associated with a transport layer protocol such as TCP or UDP. This makes ICMP a connectionless protocol: one device does not need to open a connection with another device before sending an ICMP message.
What is difference between ICMP and IGMP?
ICMP and IGMP are both protocols that operate within the sphere of IP; they are part of IP. ICMP is used for control messages (hence the name, “Internet Control Message Protocol”), while IGMP is used to facilitate management of multicast groups between cooperating routers and switches.
Is ICMP a transport layer protocol?
ICMP can “never” be considered a Network Layer protocol. If it were to be considered so, then, it will have to rely on another transport layer protocol to carry its data i.e. Its data will become the payload for a transport layer protocol, as in the case of IP. ICMP is a Transport layer protocol just like TCP and UDP.
Is ICMP a TCP or UDP?
ICMP is a network layer protocol. There is no TCP or UDP port number associated with ICMP packets as these numbers are associated with the transport layer above.
What does ICMP mean?
Short for Internet Control Message Protocol, ICMP is an extension to the Internet Protocol defined by RFC 792 and an error reporting protocol for TCP/IP messages. Most users are familiar with ICMP from using the ping command. Note.