What Does Mac Stand For In Mac Address
What Does Mac Stand For In Mac Address https://blltly.com/2tottO
Computer A wants to send an IP packet to computer B. But it does not know the MAC address of computer B. Computer A will then broadcast an ARP request received by all computers on the local network segment.
A Domain Name System (DNS) and IP addresses go hand in hand. The primary purpose of DNS is to resolve human-readable domain names to machine-readable IP addresses. And Dynamic Host Configuration Protocol (DHCP) is the standard mechanism to dynamically assign addresses within a network.
MA-S (MAC address block small) registry activity includes both a 36-bit unique number used in some standards and the assignment of a block of EUI-48 and EUI-64 identifiers (while owner of IAB cannot assign EUI-64) by the IEEE Registration Authority. MA-S does not include assignment of an OUI.
There is also another registry which is called MA-M (MAC address block medium). The MA-M assignment block provides both 220 EUI-48 identifiers and 236 EUI-64 identifiers (that means first 28 bits are IEEE assigned bits). The first 24 bits of the assigned MA-M block are an OUI assigned to IEEE that will not be reassigned, so the MA-M does not include assignment of an OUI.
The least significant bit of an address's first octet is referred to as the I/G, or Individual/Group, bit.[self-published source] When this bit is 0 (zero), the frame is meant to reach only one receiving NIC. This type of transmission is called unicast. A unicast frame is transmitted to all nodes within the collision domain. In a modern wired setting the collision domain usually is the length of the Ethernet cable between two network cards. In a wireless setting, the collision domain is all receivers that can detect a given wireless signal. If a switch does not know which port leads to a given MAC address, the switch will forward a unicast frame to all of its ports (except the originating port), an action known as unicast flood.[self-published source] Only the node with the matching hardware MAC address will accept the frame; network frames with non-matching MAC-addresses are ignored, unless the device is in promiscuous mode.
The standard (IEEE 802) format for printing EUI-48 addresses in human-friendly form is six groups of two hexadecimal digits, separated by hyphens (-) in transmission order (e.g. 01-23-45-67-89-AB). This form is also commonly used for EUI-64 (e.g. 01-23-45-67-89-AB-CD-EF). Other conventions include six groups of two hexadecimal digits separated by colons (:) (e.g. 01:23:45:67:89:AB), and three groups of four hexadecimal digits separated by dots (.) (e.g. 0123.4567.89AB); again in transmission order.
The standard notation, also called canonical format, for MAC addresses is written in transmission order with the least significant bit of each byte transmitted first, and is used in the output of the ifconfig, ip address, and ipconfig commands, for example.
However, since IEEE 802.3 (Ethernet) and IEEE 802.4 (Token Bus) send the bytes (octets) over the wire, left-to-right, with the least significant bit in each byte first, while IEEE 802.5 (Token Ring) and IEEE 802.6 (FDDI) send the bytes over the wire with the most significant bit first, confusion may arise when an address in the latter scenario is represented with bits reversed from the canonical representation. For example, an address in canonical form 12-34-56-78-9A-BC would be transmitted over the wire as bits 01001000 00101100 01101010 00011110 01011001 00111101 in the standard transmission order (least significant bit first). But for Token Ring networks, it would be transmitted as bits 00010010 00110100 01010110 01111000 10011010 10111100 in most-significant-bit first order. The latter might be incorrectly displayed as 48-2C-6A-1E-59-3D. This is referred to as bit-reversed order, non-canonical form, MSB format, IBM format, or Token Ring format, as explained in .mw-parser-output cite.citationfont-style:inherit;word-wrap:break-word.mw-parser-output .citation qquotes:"\"""\"""'""'".mw-parse