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Network segment

From Wikipedia, the free encyclopedia

A network segment is a portion of a computer network. The nature and extent of a segment depends on the nature of the network and the device or devices used to interconnect end stations.[1]

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Transcription

Ethernet

According to the defining IEEE 802.3 standards for Ethernet, a network segment is an electrical connection between networked devices using a shared medium.[2] In the original 10BASE5 and 10BASE2 Ethernet varieties, a segment would therefore correspond to a single coax cable and all devices tapped into it. At this point in the evolution of Ethernet, multiple network segments could be connected with repeaters (in accordance with the 5-4-3 rule for 10 Mbit Ethernet) to form a larger collision domain.

With twisted-pair Ethernet, electrical segments can be joined together using repeaters or repeater hubs as can other varieties of Ethernet. This corresponds to the extent of an OSI layer 1 network and is equivalent to the collision domain.[3][4] The 5-4-3 rule applies to this collision domain.

Using switches or bridges, multiple layer-1 segments can be combined to a common layer-2 segment, i.e. all nodes can communicate with each other through MAC addressing or broadcasts. A layer-2 segment is equivalent to a broadcast domain.

Traffic within a layer-2 segment can be separated into virtually distinct partitions by using virtual LANs (VLANs). Each VLAN forms its own logical layer-2 segment.

IP

A layer-3 segment in an IP network is usually called a subnetwork, formed by all nodes sharing the same network prefix as defined by their IP addresses and the network mask.[5] Communication between layer-3 subnets requires a router. Hosts on a subnet communicate directly using the layer-2 segment that connects them. Most often a subnetwork corresponds exactly with the underlying layer-2 segment but it is also possible to run multiple subnets on a single layer-2 segment.

References

  1. ^ "Network Segment Definition". 2 October 2005. Retrieved 3 September 2010.
  2. ^ "1.4.318", 802.3-2008 Part 3: Carrier sense multiple access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications, IEEE, 26 December 2008, segment: The medium connection, including connectors, between Medium Dependent Interfaces (MDIs) in a CSMA/CD local area network.
  3. ^ "Segment (Network)". Retrieved 3 September 2010.
  4. ^ "Segment". Retrieved 3 September 2010.
  5. ^ "What is a Network Segment?". Retrieved 3 September 2010.
This page was last edited on 31 January 2021, at 16:07
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