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What precisely is a link?


What is the relationship between the bandwith on a wire and the frequency?Data link layer protocols that are not part of NICHow can a telecommunications carrier convert his layer 3 transmission network to layer 2 at client site?What practices/ mechanisms/ protocols can be used to secure communication on physically exposed Ethernet links?What decides the Bit Rate on a channel/link?How does connection-oriented service at data link layer ensure each frame is sent and recieved 'once'?Etherchannel BasicsWhat is the difference between data link layer and sub data link layerData link Layer HeaderCan two packets propagate on the same communication link?













2















When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link?



So in the image below, how many links are in this network and what makes that the case? Is it the physical cable between two devices, or can a link span multiple devices, or something else?



enter image description here










share|improve this question




























    2















    When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link?



    So in the image below, how many links are in this network and what makes that the case? Is it the physical cable between two devices, or can a link span multiple devices, or something else?



    enter image description here










    share|improve this question


























      2












      2








      2








      When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link?



      So in the image below, how many links are in this network and what makes that the case? Is it the physical cable between two devices, or can a link span multiple devices, or something else?



      enter image description here










      share|improve this question
















      When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link?



      So in the image below, how many links are in this network and what makes that the case? Is it the physical cable between two devices, or can a link span multiple devices, or something else?



      enter image description here







      lan layer2 networking






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 1 hour ago







      Sam P

















      asked 2 hours ago









      Sam PSam P

      1445




      1445




















          2 Answers
          2






          active

          oldest

          votes


















          2














          There is no single precise definition for a "link".



          A link can be a physical layer connection, two ports connected by a cable.



          A link can also be understood as a general connection by data link layer, ie. point-to-multipoint (as in "does the VLAN link over that trunk?" or with an aggregated link).



          The TCP/IP model defines the link layer as the one below the network layer (=OSI layers 1 and 2). It doesn't care what goes on in there.






          share|improve this answer






























            0














            Link is physical or Logical(Virtual) Connection which use to interconnect host/nodes(Devices). Link always refer connectivity. Link can span over multiple device. If you want to connection between America and Australia, You need to have Link. It will not be direct connection between two device. It is required to go through multiple devices.



            Link Protocol is collection of standards that operate in LAN or WAN.(Between Adjacent Network nodes )






            share|improve this answer























            • So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

              – Sam P
              1 hour ago












            • Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

              – serverAdmin123
              1 hour ago












            • You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

              – serverAdmin123
              1 hour ago












            Your Answer








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            2 Answers
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            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            There is no single precise definition for a "link".



            A link can be a physical layer connection, two ports connected by a cable.



            A link can also be understood as a general connection by data link layer, ie. point-to-multipoint (as in "does the VLAN link over that trunk?" or with an aggregated link).



            The TCP/IP model defines the link layer as the one below the network layer (=OSI layers 1 and 2). It doesn't care what goes on in there.






            share|improve this answer



























              2














              There is no single precise definition for a "link".



              A link can be a physical layer connection, two ports connected by a cable.



              A link can also be understood as a general connection by data link layer, ie. point-to-multipoint (as in "does the VLAN link over that trunk?" or with an aggregated link).



              The TCP/IP model defines the link layer as the one below the network layer (=OSI layers 1 and 2). It doesn't care what goes on in there.






              share|improve this answer

























                2












                2








                2







                There is no single precise definition for a "link".



                A link can be a physical layer connection, two ports connected by a cable.



                A link can also be understood as a general connection by data link layer, ie. point-to-multipoint (as in "does the VLAN link over that trunk?" or with an aggregated link).



                The TCP/IP model defines the link layer as the one below the network layer (=OSI layers 1 and 2). It doesn't care what goes on in there.






                share|improve this answer













                There is no single precise definition for a "link".



                A link can be a physical layer connection, two ports connected by a cable.



                A link can also be understood as a general connection by data link layer, ie. point-to-multipoint (as in "does the VLAN link over that trunk?" or with an aggregated link).



                The TCP/IP model defines the link layer as the one below the network layer (=OSI layers 1 and 2). It doesn't care what goes on in there.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 1 hour ago









                Zac67Zac67

                33.8k22167




                33.8k22167





















                    0














                    Link is physical or Logical(Virtual) Connection which use to interconnect host/nodes(Devices). Link always refer connectivity. Link can span over multiple device. If you want to connection between America and Australia, You need to have Link. It will not be direct connection between two device. It is required to go through multiple devices.



                    Link Protocol is collection of standards that operate in LAN or WAN.(Between Adjacent Network nodes )






                    share|improve this answer























                    • So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                      – Sam P
                      1 hour ago












                    • Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                      – serverAdmin123
                      1 hour ago












                    • You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                      – serverAdmin123
                      1 hour ago
















                    0














                    Link is physical or Logical(Virtual) Connection which use to interconnect host/nodes(Devices). Link always refer connectivity. Link can span over multiple device. If you want to connection between America and Australia, You need to have Link. It will not be direct connection between two device. It is required to go through multiple devices.



                    Link Protocol is collection of standards that operate in LAN or WAN.(Between Adjacent Network nodes )






                    share|improve this answer























                    • So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                      – Sam P
                      1 hour ago












                    • Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                      – serverAdmin123
                      1 hour ago












                    • You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                      – serverAdmin123
                      1 hour ago














                    0












                    0








                    0







                    Link is physical or Logical(Virtual) Connection which use to interconnect host/nodes(Devices). Link always refer connectivity. Link can span over multiple device. If you want to connection between America and Australia, You need to have Link. It will not be direct connection between two device. It is required to go through multiple devices.



                    Link Protocol is collection of standards that operate in LAN or WAN.(Between Adjacent Network nodes )






                    share|improve this answer













                    Link is physical or Logical(Virtual) Connection which use to interconnect host/nodes(Devices). Link always refer connectivity. Link can span over multiple device. If you want to connection between America and Australia, You need to have Link. It will not be direct connection between two device. It is required to go through multiple devices.



                    Link Protocol is collection of standards that operate in LAN or WAN.(Between Adjacent Network nodes )







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 2 hours ago









                    serverAdmin123serverAdmin123

                    54817




                    54817












                    • So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                      – Sam P
                      1 hour ago












                    • Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                      – serverAdmin123
                      1 hour ago












                    • You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                      – serverAdmin123
                      1 hour ago


















                    • So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                      – Sam P
                      1 hour ago












                    • Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                      – serverAdmin123
                      1 hour ago












                    • You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                      – serverAdmin123
                      1 hour ago

















                    So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                    – Sam P
                    1 hour ago






                    So would it be correct to say my laptop has a link with every accessible device in the internet as well as in my LAN? And following on from that, does my laptop have a link with transparent devices like switches that sit between it and other devices, even if it's not aware of it?

                    – Sam P
                    1 hour ago














                    Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                    – serverAdmin123
                    1 hour ago






                    Just think you are flying from America to Australia,Your plane may go through Europe,Asia and many countries. Sometimes plane may land in few countries. You are not allow to visit those countries. But you can fly through those countries. You are flying to Australia not to Europe or other country. Same for Links as well. Hope you understand???

                    – serverAdmin123
                    1 hour ago














                    You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                    – serverAdmin123
                    1 hour ago






                    You have mixed link and connection, As nouns the difference between connection and link. is that connection is (uncountable) the act of connecting while link is a connection between places, persons, events, or things or link can be (obsolete) a torch, used to light dark streets. wikidiff.com/connection/link

                    – serverAdmin123
                    1 hour ago


















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