DeVoe, Charles (PKI) wrote: > > I have been looking at the transcender exams to get a final > brush up for the > CCNA exam. In those exams there are questions about the > routers response to > things like trace and ping. I believe they are referring to > ICMP messages.
Yes, they are referring to ICMP messages. The ICMP RFC is 792. > The response types they mention are things like the responses > they use are > !H, N, P, and U. Cisco's traceroute gives more precise results than ping, including: H - host unreachable N - network unreachable P - protocol unreachable U - port unreachable Those are all subcategories of the generic ICMP destination unreachable message. Cisco's ping just gives back without the detailed reason: U - destination unreachable Both of them have a few other possible results. ! means success, of course, for both of them. > I've never seen these before and was > wondering where I > could find the list of responses in this format. Search on ICMP, ping, and traceroute on Cisco's site. Cisco has an excellent paper called "Understanding the Ping and Traceroute Commands." Be sure to spell out traceroute in your search string. This is also covered in "Troubleshooting Campus Networks. :-) It should be in most CCNA books too!? _______________________________ Priscilla Oppenheimer www.troubleshootingnetworks.com www.priscilla.com > Thanks > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65218&t=65169 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
