Network segment

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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]


According to the defining IEEE standards for Ethernet, a network segment is an electrical connection between networked devices.[2]

In the original 10BASE5 and 10BASE2 Ethernet varieties, a segment would therefore correspond to a single coax cable and any 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) to form a larger collision domain.

According to the IEEE definition for modern twisted-pair Ethernet, a network segment refers to an individual connection between an end station and a network device (such as a repeater, hub or switch) or to a connection between two network devices.

Although the above definition indicates that it is possible to have multiple network segments within a collision domain by using repeaters or hubs, the term "network segment" is sometimes used as a synonym for collision domain.[3][4]

Token ring[edit]

All end stations connected to the same Media Access Unit for token ring are part of the same network segment.[citation needed]

Token bus[edit]

All end stations connected to the same token bus are part of the same network segment.[citation needed]

Other uses[edit]


  1. ^ "Network Segment Definition". 2 October 2005. Retrieved 2010-09-03. 
  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 2010-09-03. 
  4. ^ "Segment". Retrieved 2010-09-03. 
  5. ^ "What is a Network Segment?". Retrieved 2010-09-03.