Cisco Discovery Protocol (CDP)

Cisco Discovery Protocol (CDP) is a Layer 2, media-independent, and network-independent protocol that runs on Cisco devices to learn about directly connected devices.

This protocol facilitates the management of Cisco devices by discovering the directly connected devices, determining how they are configured and allowing systems, using different network-layer protocols, to learn about each other.

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Minimum Default Configuration on Cisco Switch/Router

  • Hostname

Hostnames must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphens. Names must be 63 characters or fewer. If you establish sessions to multiple devices, the hostname helps you keep track of where you enter commands. Creating an all numeric hostname is not recommended but the name will be accepted after an error is returned.

  • Enable secret

To provide an additional layer of security, particularly for passwords that cross the network, this allow you to establish an encrypted password that users must enter to access enable mode (the default), or any privilege level you specify.Read More »

Collision Domain

A collision is the result of two devices or hosts on the Ethernet network attempting to transmit data at exactly the same time.

A collision domain is an area of a network where collisions can happen.

If more number of devices are in a single collision domain then the chances of collision also increases. As the devices in a single collision domain share the available bandwidth, the increased collisions will result in a low quality network.

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