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TOPIC: Network 127.0.0.0

Network 127.0.0.0 13 years 8 months ago #7589

The CCNA books from Cisco Press say 127.0.0.0 is a class A network but is only for diagnostics. The Test Out course says 127.0.0.0 is not included in any class of addresses. What would be the correct answer on the 640-801?

127 13 years 8 months ago #7597

The network 127.0.0.0 is indeed reserved for test purposes. Perhaps the most famous address within it is the universal loopback address, 127.0.0.1. This is a standard feature of every TCP/IP implementation so you can't use it elsewhere for 'real' communications. It is usually set up so that if you ping 127.0.0.anything on your machine then 127.0.0.1 will reply. Hence the whole 127 network is reserved for test

Re: Network 127.0.0.0 13 years 8 months ago #7604

So.....for the CCNA, is it a class A network or not.

Re: Network 127.0.0.0 13 years 8 months ago #7606

Its technically a Class A reserved address for loopback.
Sahir Hidayatullah.
Firewall.cx Staff - Associate Editor & Security Advisor
tftfotw.blogspot.com

127.0.0.1 13 years 8 months ago #7657

I agree
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