Broadcast domain - Citizendia

A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A computer network is a group of interconnected Computers. Networks may be classified according to a wide variety of characteristics A node ( Latin nodus, ‘knot’ is a critical element of any Computer network. In Computer networking, broadcasting refers to transmitting a packet that will be received (conceptually by every device on the network The Data Link Layer is Layer 2 of the seven-layer OSI model. It responds to service requests from the Network Layer and issues service requests to the

In terms of current popular technologies: Any computer connected to the same Ethernet repeater or switch is a member of the same broadcast domain. Ethernet is a family of frame -based Computer networking technologies for Local area networks (LANs A repeater is an electronic device that receives a signal and Retransmits it at a higher level and/or higher power or onto the other side of an obstruction A Further, any computer connected to the same set of inter-connected switches/repeaters is a member of the same broadcast domain. Routers and other higher-layer devices form boundaries between broadcast domains. A router ('rautər in the USA 'rutər in the UK and Ireland, or either pronunciation in Australia and Canada is a Computer whose software and hardware are usually The Network Layer is Layer 3 (of seven in the OSI model of networking

This is as compared to a collision domain, which would be all nodes on the same set of inter-connected repeaters, divided by switches and learning bridges. A collision domain is a physical Network segment where Data packets can "collide" with one another for being sent on a shared medium in particular Collisions domains are generally smaller than, and contained within, broadcast domains.

Further explanation

The distinction between broadcast and collision domain comes about because simple Ethernet and similar systems use a shared transmission system. Ethernet is a family of frame -based Computer networking technologies for Local area networks (LANs See Transmission (mechanics for a car's transmission system In Telecommunications a transmission system is a system that transmits a In simple Ethernet (without switches or bridges), data frames are transmitted to all other nodes on a network. A network bridge connects multiple Network segments at the Data link layer (layer 2 of the OSI model, and the term layer 2 switch is often In Computer networking, a frame is a Data packet of fixed or variable length which has been encoded by a Data link layer communications protocol for digital Each receiving node checks the destination address of each frame, and simply ignores any frame not addressed to its own MAC address, or to the broadcast address. In Computer networking a Media Access Control address ( MAC address) or Ethernet Hardware Address ( EHA) hardware address In Computer networking, a broadcast address is an IP address that allows information to be sent to all machines on a given subnet rather than a specific If two nodes transmit at the same time, a collision results. In Telecommunication, the term collision has the following meanings In a Data Transmission system, the situation that occurs when two or Repeaters propagate all frames between network segments, and do not prevent collisions, and thus also propagate collisions between segments. A network segment is a portion of a Computer network wherein every device communicates using the same Physical layer. In such a configuration, the broadcast domain is also the collision domain; they are mutually inclusive.

Switches (and their predecessor technology, learning bridges) act as buffers, receiving and analyzing the frames from each connected network segment. Frames destined for nodes connected to the originating segment are not forwarded by the switch. Frames destined for a specific node on a different segment are sent only to that segment. Only broadcast frames are forwarded to all other segments. This reduces unnecessary traffic and collisions.

In such a switched network, transmitted frames may not be received by all other reachable nodes. Nominally, only broadcast frames will be received by all other nodes. Collisions are localized to the network segment they occur on. Thus, the broadcast domain is the entire inter-connected layer two network, and the segments connected to each switch/bridge port are each a collision domain. The Network Layer is Layer 3 (of seven in the OSI model of networking

Not all network systems or media feature broadcast/collision domains. For example, PPP links have neither. In networking, the Point-to-Point Protocol, or PPP, is a data link protocol commonly used to establish a direct connection between two nodes

Further explanation

See also