Standard cable

 Standard and crossover cables are two types of Ethernet cables used for different purposes in networking:

1. **Standard Cable (Straight-Through Cable)**: This type of Ethernet cable is used to connect different types of devices, such as a computer to a switch, hub, or router. It has the same wiring on both ends, following either the T568A or T568B standard. The most common configuration is T568B on both ends.

A rollowar cable, more commonly referred to as a roll-over cable, is a type of cable used primarily in networking to connect a computer terminal to a router or switch's console port. It is called a "roll-over" cable because the pinout on one end of the cable is a mirror image of the pinout on the other end, effectively flipping the wire connections. This type of cable is often used for configuration and management purposes in network devices.

2. **Crossover Cable**: This Ethernet cable is used to connect similar devices directly, such as connecting two computers or two switches without using a hub or router. In a crossover cable, certain pairs of wires are swapped (usually the transmit and receive pairs) to allow the devices to communicate directly. One end of the cable follows the T568A standard, and the other end follows the T568B standard.

**Key Differences**:

- **Wiring Configuration**: Standard cables have the same wiring pattern on both ends, while crossover cables have different wiring patterns on each end.

- **Use Cases**: Standard cables are used to connect different types of devices, whereas crossover cables connect similar devices.

With advancements in networking technology, many modern devices support Auto MDI-X, which automatically adjusts for either type of cable, making crossover cables less commonly needed.