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  2. Wildcard mask - Wikipedia

    en.wikipedia.org/wiki/Wildcard_mask

    A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example:

  3. Classless Inter-Domain Routing - Wikipedia

    en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

    A subnet mask is a bitmask that encodes the prefix length associated with an IPv4 address or network in quad-dotted notation: 32 bits, starting with a number of 1-bits equal to the prefix length, ending with 0-bits, and encoded in four-part dotted-decimal format: 255.255.255.0. A subnet mask encodes the same information as a prefix length but ...

  4. Broadcast address - Wikipedia

    en.wikipedia.org/wiki/Broadcast_address

    3. Bit complement (bitwise NOT) of the subnet mask 00000000.00001111.11111111.11111111: 0.15.255.255 4. Broadcast address (bitwise OR of 1. Network IP address and 3. Bit complement of the subnet mask. This makes the broadcast address the largest possible IP address (and host address, since the host address portion is all 1s) for any given ...

  5. Subnet - Wikipedia

    en.wikipedia.org/wiki/Subnet

    This allows for 62 host combinations (2 6 −2). In general, the number of available hosts on a subnet is 2 h −2, where h is the number of bits used for the host portion of the address. The number of available subnets is 2 n, where n is the number of bits used for the network portion of the address.

  6. Classful network - Wikipedia

    en.wikipedia.org/wiki/Classful_network

    The number of addresses usable for addressing specific hosts in each network is always 2 N - 2, where N is the number of rest field bits, and the subtraction of 2 adjusts for the use of the all-bits-zero host value to represent the network address and the all-bits-one host value for use as a broadcast address. Thus, for a Class C address with 8 ...

  7. Private network - Wikipedia

    en.wikipedia.org/wiki/Private_network

    With space for about one trillion (10 12) prefixes, it is unlikely that two network prefixes in use by different organizations would be the same, provided each of them was selected randomly, as specified in the standard. When two such private IPv6 networks are connected or merged, the risk of an address conflict is therefore virtually absent.

  8. Multicast address - Wikipedia

    en.wikipedia.org/wiki/Multicast_address

    Internet Group Management Protocol (IGMP) version 3 [22]: §4.2.14 No 224.0.0.102 Hot Standby Router Protocol version 2 (HSRPv2) / Gateway Load Balancing Protocol (GLBP) No 224.0.0.107 Precision Time Protocol (PTP) version 2 peer delay measurement messaging No 224.0.0.251 Multicast DNS (mDNS) address No 224.0.0.252

  9. IP routing - Wikipedia

    en.wikipedia.org/wiki/IP_routing

    A default route is recognized by the destination 0.0.0.0 and the flag G. A network router is identified by the network mask 255.255.255.255 and the flag H . Common routing flags

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