100-150 Question 158
Single answerYou are reviewing a network diagram provided by an engineer. The diagram shows a connection between a switch and a router using a FastEthernet port on both devices. Which cable should you use to establish this connection?
- A
Straight-through cable
- B
Crossover cable
- C
Fiber optic cable
- D
Console cable
Show answer and explanation
Correct answer: B
Explanation
In a network diagram showing a connection between a switch and a router using FastEthernet ports, a crossover cable is required because these are similar devices in terms of how they communicate on the same type of interface. Unlike straight-through cables, which are used for dissimilar device connections (e.g., PC to switch), the crossover cable properly aligns the transmit and receive pins for communication between the switch and router.
- A. Incorrect.
Straight-through cables are typically used to connect dissimilar devices, such as a PC to a switch or router to a PC. However, for connecting similar devices like two FastEthernet ports, a crossover cable is required.
- B. Correct.
Crossover cables are used to connect similar devices, such as router-to-router, switch-to-switch, or router-to-switch when using FastEthernet ports. This is the correct choice for this scenario.
- C. Incorrect.
Fiber optic cables are used for long-distance or high-speed connections, typically between core network devices, and would not be applicable for a standard FastEthernet connection.
- D. Incorrect.
Console cables are used for device configuration via a console port, not for making standard network connections between devices.