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Is ICMP L3 or l4?
ICMP is L3, transported inside a L3 packet.
What does ICMP run on?
ICMP gives TCP/IP a way to handle errors. Any network device that is using TCP/IP has the capability to send, receive, or process ICMP messages. For ICMP to work efficiently in a networked environment, there has to be some basic ground rules as to how ICMP messages should be handled.
Is OSPF layer 2?
While OSPF was natively built to route IP and is itself a Layer 3 protocol that runs on top of IP, IS-IS is an OSI Layer 2 protocol.
Is ICMP a Layer 2?
I found that these books have stated ARP and ICMP as a layer 2 protocol for OSI model (i.e. data link layer) and a layer 2 for TCP/IP model too (i.e. Internet layer).
Why is ICMP categorized as a layer 3 protocol?
Therefore, in the topic on TCP/IP-based layered network, ICMP is shown as a layer 3 protocol. Which layer ICMP belongs to is a subject of fierce debate. The ICMP header is at layer 4, just like TCP and UDP so people argue that it belongs in layer 4.
How is ICMP classified in the OSI model?
The ICMP header is at layer 4, just like TCP and UDP so people argue that it belongs in layer 4. Others however argue that ICMP is a layer 3 protocol, since it assists IP and has no concept of ports. For me, classification of a protocol as belonging to a certain layer in the OSI model depends on how protocol works.
Is the Ping Protocol Layer 3 or layer 4?
It simply packs all ICMP information in ICMP header and packs that ICMP as data in Layer 3 IP Protocol and further in Layer 2 Ethernet and transmits. So finally Ping (ICMP) is a Layer 3 Protocol. Advertisements
What do you need to know about ICMP and ports?
Without ports, there could be only a single TCP connection between any two hosts, or a single TCP service running on a server. (Likewise with UDP or any other transport protocol.) ICMP is not a transport protocol but a part of the IP protocol. It is used for signaling between hosts.