Quick note on the ping command.....
Disclaimer: This isn't part of the course that I'm taking. I took the time to go outside of the course to learn this because of the tricky wording that is used in the CCNA test. It was confusing me and I needed to be clear on what they were asking.
The ping command can get down in the weeds if you want to go there, but here's what you really need to know for the CCNA test.
* Ping falls under the ICMP Protocol
** ICMP is defined in RFC (Request For Comments) RFC792. Looking at its position in the OSI model we can see that it's sitting in the Network layer (layer 3) alongside IP. There are no ports used with ICMP, this is because of where the protocol sits in the OSI model. Ports are only used for protocols which work at the Session layer and above:
*** Ping is also known as "echo request" and is identified by the number 8 if you're capturing a ping packet on Wire Shark. If you're capturing a echo (ping) reply on Wire Shark, it will be identified by the number 0.
Ping Request: Identifier number = 8
Ping Reply: Identifier number = 0
There's a lot more to it but I don't necessarily know that we need to know all of the information. Again, I'm doing this outside of the framework of the CCNA course.
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