Which two pairs of LAN Ethernet devices use an RJ-45 straight-through cable? (Choose two.)
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A. B. C. D. E.BE.
An RJ-45 straight-through cable is a type of Ethernet cable where the wiring arrangement of the eight wires in the cable is the same at both ends of the cable. This type of cable is used to connect devices that have different functions or roles in a network, such as devices that transmit and receive data (like a switch and a router) or devices that only receive data (like a switch and a server).
Out of the options given, the two pairs of LAN Ethernet devices that use an RJ-45 straight-through cable are:
A. switch-to-switch: When connecting two switches together, an RJ-45 straight-through cable is used. This is because both switches are transmitting and receiving data, so the wiring arrangement needs to be the same at both ends of the cable to ensure proper data transmission.
E. switch-to-server: When connecting a switch to a server, an RJ-45 straight-through cable is used. This is because the switch is transmitting data to the server, and the server is receiving data, so the wiring arrangement needs to be the same at both ends of the cable.
The other options given do not use an RJ-45 straight-through cable:
B. switch-to-router: When connecting a switch to a router, an RJ-45 crossover cable is used. This is because the switch is transmitting data to the router, which is also transmitting data back to the switch. The wiring arrangement needs to be reversed at one end of the cable to ensure proper data transmission.
C. switch-to-hub: When connecting a switch to a hub, an RJ-45 crossover cable is used. This is because the switch is transmitting data to the hub, which is also transmitting data back to the switch. The wiring arrangement needs to be reversed at one end of the cable to ensure proper data transmission.
D. router-to-router: When connecting two routers together, an RJ-45 crossover cable is used. This is because both routers are transmitting and receiving data, so the wiring arrangement needs to be reversed at one end of the cable to ensure proper data transmission.
In summary, an RJ-45 straight-through cable is used when connecting devices that have different functions or roles in a network, such as a switch to another switch or a switch to a server. An RJ-45 crossover cable is used when connecting devices that have the same function or role in a network, such as a switch to a router or a router to another router.