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Both IP versions however use the CIDR concept and notation. In this, the IP address is followed by a slash and the number (in decimal) of bits used for the network part, also called the routing prefix. For example, an IPv4 address and its subnet mask may be 192.0.2.1 and 255.255.255.0, respectively.
CIDR notation is a compact representation of an IP address and its associated network mask. The notation was invented by Phil Karn in the 1980s. [9] [10] CIDR notation specifies an IP address, a slash ('/') character, and a decimal number. The decimal number is the count of consecutive leading 1-bits (from left to right) in the network mask ...
To indicate what IP addresses should be permitted or denied in access control lists (ACLs). A wildcard mask can be thought of as an inverted subnet mask . For example, a subnet mask of 255.255.255.0 ( 11111111.11111111.11111111.00000000 2 ) inverts to a wildcard mask of 0.0.0.255 ( 00000000.00000000.00000000.11111111 2 ).
The modern standard form of specification of the network prefix is CIDR notation, used for both IPv4 and IPv6. It counts the number of bits in the prefix and appends that number to the address after a slash (/) character separator. This notation was introduced with Classless Inter-Domain Routing (CIDR). [2]
224.0.1.40 The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates. Yes 224.0.1.41 H.323 Gatekeeper discovery address Yes 224.0.1.129–132 Precision Time Protocol (PTP) version 1 messages (Sync, Announce, etc.) except peer delay measurement Yes 224.0.1.129
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The default route in Internet Protocol Version 4 (IPv4) is designated as the zero address, 0.0.0.0 / 0 in CIDR notation. [2] Similarly, in IPv6, the default route is specified by :: / 0. The subnet mask is specified as / 0, which effectively specifies all networks and is the shortest match possible. A route lookup that does not match any other ...
ANSI/TIA/EIA-568-B.1-2001: CCITT (obs.) Standards organization that has been replaced by ITU-T Organization ITU-T: CHAP: Challenge-Handshake Authentication Protocol (PPP) Security, telecom RFC 1994 CIDR: Classless Inter-Domain Routing Architecture RFC 1518 RFC 1519 CIR: Committed Information Rate (Frame Relay) Telecom RFC 1490 RFC 1973 RFC 2427 CLI