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Notable Replies

  1. Great insight on IPs, still struggling with the subject but this is well helpfull moving forward. Thank you, great we'll.

  2. Hi i am Ali. I read this article . it is very helpful for beginners in Cisco IP Routing.

    Thanks Again

  3. Hi Hussein,

    Back in the 80s we only used class A,B and C ranges so that's probably why they reserved an entire class A range for the loopback. We didn't have VLSM back then and the idea of running out of IP addresses probably never occured to anyone.

    Rene

  4. Hi Rene,

    What do the address 127.0.0.0 and 127.255.255.255 mean?
    I thought all the IPs that start with 127 can be used to refer our PC. When I ping them, I get the below messages.

    C:\Users\VijayKumar>ping 127.0.0.0

    Pinging 127.0.0.0 with 32 bytes of data:
    General failure.
    General failure.
    General failure.
    General failure.

    Ping statistics for 127.0.0.0:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

    C:\Users\VijayKumar>
    C:\Users\VijayKumar>
    C:\Users\VijayKumar>ping 127.255.255.255

    Pinging 127.255.255.255 with 32 bytes of data:
    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.

    Ping statistics for 127.255.255.255:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

    C:\Users\VijayKumar>

    Are they reserved for network and broadcast addresses even though we won't be using them anywhere?

    Cheers,
    Vj

  5. Hi VJ,

    The 127.0.0.0/8 range is used for loopback addresses.

    127.0.0.0 is the network address and 127.255.255.255 is the broadcast address.

    You can ping any address in the 127.0.0.0/8 range except those two.

    Rene

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