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Thread: Cidr

  1. #1

    Cidr

    Hi Guys, wat is meant by CIDR......then its use............


  2. #2
    Junior Member
    Join Date
    Apr 2007
    Answers
    2

    Re: Cidr

    CIDR stands for classless inter-domain routing.
    Previously IP addresses were managed by organisations on the basis of classes.
    There are mainly four classes of IP addresses (Class A-D)
    Each class specifies number of hosts that can be present on the network. Class B was the most used one. e.g.
    Class # Network Bits # Hosts Bits Subnet mask
    Class B 16 bits 16 bits 255.255.0.0

    A class B address means maximum number of 2^16=655535 host addresses for each N/w address. But the Classes used meant wastage of IP addresses.

    Therefore CIDR was introduced in which network bits can be assigned values according to usage e.g. 172.21.160.0/24 means that network address is 172.21.160.0 and hosts range from 172.21.160.1-172.21.160.255. BGP/OSPF/ISIS supports CIDR.

    Last edited by pisces_sangha; 05-26-2007 at 10:29 AM. Reason: addtional information added

  3. #3
    Junior Member
    Join Date
    Jan 2008
    Answers
    2

    Re: Cidr

    CIDR means classless Inter Domain Routing


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