Why does it say, that a Switch can segregate the collision domain?

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In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode.



So, why is there a saying:




Switch can segregate the collision domain




I thought the Switch Store and Forward mode and RF-45's full duplex mode eliminates collisions.






switch







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    up vote
    2
    down vote

    favorite












    In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode.



    So, why is there a saying:




    Switch can segregate the collision domain




    I thought the Switch Store and Forward mode and RF-45's full duplex mode eliminates collisions.






    switch







    share|improve this question

























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode.



      So, why is there a saying:




      Switch can segregate the collision domain




      I thought the Switch Store and Forward mode and RF-45's full duplex mode eliminates collisions.






      switch







      share|improve this question















      In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode.



      So, why is there a saying:




      Switch can segregate the collision domain




      I thought the Switch Store and Forward mode and RF-45's full duplex mode eliminates collisions.






      switch




      switch






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      share|improve this question













      share|improve this question




      share|improve this question








      edited 6 hours ago









      Cown

      4,5463830




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      asked 7 hours ago









      qg_java_17137

      1674




      1674




















          2 Answers
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          A collision domain is a network segment connected by a shared medium or through repeaters/switches where data packets may collide with one another while being sent. The collision domain applies particularly in wireless networks, but also affected early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.



          Since every port in a switch is its own collision domain, a host will never collide unless it's medium is running half duplex.



          That is why a switch segregates collision domains, because every port is an individual collision domain.






          share|improve this answer





























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            The main point with switches is that they buffer network frames. This enables a switch to receive a frame and then forward it later when the egress link is idle. This decoupling of receive and transmit operations enables a network that works with flows that are largely independent from each other and only compete for link bandwidth.



            This is in stark contrast to repeater hubs that repeat incoming bits while they are received. A hub can't buffer anything, so a collision on an egress interface needs to disrupt reception on the ingress interface - the hub needs to propagate an upstream collision back to the source. This way, all nodes connected to a hub (or potentially chained hubs) form a single, common collision domain. Only one node at a time can transmit.



            A switch connected to a hub (or another non full-duplex capable device) can still use half-duplex mode on one of its ports but due to the buffering between the ports, any collision will not propagate across the switch. Therefore, a switch segregates collision domains or removes them completely.



            Note that half-duplex Ethernet and hubs are very much a thing of the past and only interesting for historical reasons or under very specific circumstances. Practically all Gigabit and (by standard) faster Ethernet links have dropped support for half-duplex communication and you need to use switched or point-to-point connections exclusively.






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              up vote
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              accepted










              A collision domain is a network segment connected by a shared medium or through repeaters/switches where data packets may collide with one another while being sent. The collision domain applies particularly in wireless networks, but also affected early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.



              Since every port in a switch is its own collision domain, a host will never collide unless it's medium is running half duplex.



              That is why a switch segregates collision domains, because every port is an individual collision domain.






              share|improve this answer


























                up vote
                4
                down vote



                accepted










                A collision domain is a network segment connected by a shared medium or through repeaters/switches where data packets may collide with one another while being sent. The collision domain applies particularly in wireless networks, but also affected early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.



                Since every port in a switch is its own collision domain, a host will never collide unless it's medium is running half duplex.



                That is why a switch segregates collision domains, because every port is an individual collision domain.






                share|improve this answer
























                  up vote
                  4
                  down vote



                  accepted







                  up vote
                  4
                  down vote



                  accepted






                  A collision domain is a network segment connected by a shared medium or through repeaters/switches where data packets may collide with one another while being sent. The collision domain applies particularly in wireless networks, but also affected early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.



                  Since every port in a switch is its own collision domain, a host will never collide unless it's medium is running half duplex.



                  That is why a switch segregates collision domains, because every port is an individual collision domain.






                  share|improve this answer














                  A collision domain is a network segment connected by a shared medium or through repeaters/switches where data packets may collide with one another while being sent. The collision domain applies particularly in wireless networks, but also affected early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.



                  Since every port in a switch is its own collision domain, a host will never collide unless it's medium is running half duplex.



                  That is why a switch segregates collision domains, because every port is an individual collision domain.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited 18 mins ago









                  jonathanjo

                  5,715323




                  5,715323










                  answered 6 hours ago









                  Cown

                  4,5463830




                  4,5463830




















                      up vote
                      3
                      down vote













                      The main point with switches is that they buffer network frames. This enables a switch to receive a frame and then forward it later when the egress link is idle. This decoupling of receive and transmit operations enables a network that works with flows that are largely independent from each other and only compete for link bandwidth.



                      This is in stark contrast to repeater hubs that repeat incoming bits while they are received. A hub can't buffer anything, so a collision on an egress interface needs to disrupt reception on the ingress interface - the hub needs to propagate an upstream collision back to the source. This way, all nodes connected to a hub (or potentially chained hubs) form a single, common collision domain. Only one node at a time can transmit.



                      A switch connected to a hub (or another non full-duplex capable device) can still use half-duplex mode on one of its ports but due to the buffering between the ports, any collision will not propagate across the switch. Therefore, a switch segregates collision domains or removes them completely.



                      Note that half-duplex Ethernet and hubs are very much a thing of the past and only interesting for historical reasons or under very specific circumstances. Practically all Gigabit and (by standard) faster Ethernet links have dropped support for half-duplex communication and you need to use switched or point-to-point connections exclusively.






                      share|improve this answer
























                        up vote
                        3
                        down vote













                        The main point with switches is that they buffer network frames. This enables a switch to receive a frame and then forward it later when the egress link is idle. This decoupling of receive and transmit operations enables a network that works with flows that are largely independent from each other and only compete for link bandwidth.



                        This is in stark contrast to repeater hubs that repeat incoming bits while they are received. A hub can't buffer anything, so a collision on an egress interface needs to disrupt reception on the ingress interface - the hub needs to propagate an upstream collision back to the source. This way, all nodes connected to a hub (or potentially chained hubs) form a single, common collision domain. Only one node at a time can transmit.



                        A switch connected to a hub (or another non full-duplex capable device) can still use half-duplex mode on one of its ports but due to the buffering between the ports, any collision will not propagate across the switch. Therefore, a switch segregates collision domains or removes them completely.



                        Note that half-duplex Ethernet and hubs are very much a thing of the past and only interesting for historical reasons or under very specific circumstances. Practically all Gigabit and (by standard) faster Ethernet links have dropped support for half-duplex communication and you need to use switched or point-to-point connections exclusively.






                        share|improve this answer






















                          up vote
                          3
                          down vote










                          up vote
                          3
                          down vote









                          The main point with switches is that they buffer network frames. This enables a switch to receive a frame and then forward it later when the egress link is idle. This decoupling of receive and transmit operations enables a network that works with flows that are largely independent from each other and only compete for link bandwidth.



                          This is in stark contrast to repeater hubs that repeat incoming bits while they are received. A hub can't buffer anything, so a collision on an egress interface needs to disrupt reception on the ingress interface - the hub needs to propagate an upstream collision back to the source. This way, all nodes connected to a hub (or potentially chained hubs) form a single, common collision domain. Only one node at a time can transmit.



                          A switch connected to a hub (or another non full-duplex capable device) can still use half-duplex mode on one of its ports but due to the buffering between the ports, any collision will not propagate across the switch. Therefore, a switch segregates collision domains or removes them completely.



                          Note that half-duplex Ethernet and hubs are very much a thing of the past and only interesting for historical reasons or under very specific circumstances. Practically all Gigabit and (by standard) faster Ethernet links have dropped support for half-duplex communication and you need to use switched or point-to-point connections exclusively.






                          share|improve this answer












                          The main point with switches is that they buffer network frames. This enables a switch to receive a frame and then forward it later when the egress link is idle. This decoupling of receive and transmit operations enables a network that works with flows that are largely independent from each other and only compete for link bandwidth.



                          This is in stark contrast to repeater hubs that repeat incoming bits while they are received. A hub can't buffer anything, so a collision on an egress interface needs to disrupt reception on the ingress interface - the hub needs to propagate an upstream collision back to the source. This way, all nodes connected to a hub (or potentially chained hubs) form a single, common collision domain. Only one node at a time can transmit.



                          A switch connected to a hub (or another non full-duplex capable device) can still use half-duplex mode on one of its ports but due to the buffering between the ports, any collision will not propagate across the switch. Therefore, a switch segregates collision domains or removes them completely.



                          Note that half-duplex Ethernet and hubs are very much a thing of the past and only interesting for historical reasons or under very specific circumstances. Practically all Gigabit and (by standard) faster Ethernet links have dropped support for half-duplex communication and you need to use switched or point-to-point connections exclusively.







                          share|improve this answer












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                          answered 34 mins ago









                          Zac67

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