Question 1

What is Cisco CDP used for?

Accepted Answer

We use CDP protocol in Cisco environments to discover and collect device information. It actually sends periodic broadcasts. Thus, it shares details such as ports and device type. In addition, we obtain information such as operating system version and IP address. Thanks to the discovery protocol, we can troubleshoot network problems more efficiently. Because of that, we test active devices during inventory management. We can learn not only the active environment but also the information of a new device we add. Plus, it also benefits us in terms of VoIP and video conferencing equipment. Moreover, we can increase performance by making optimum configurations for voice and video traffic.

Question 2

Is CDP Layer 2 or Layer 3?

Accepted Answer

This protocol works at Layer 2 of the OSI model, that is, the data link layer. That is, through this layer, we provide our devices with direct communication over LANs. We can also transmit and receive data frames without using Layer 3 protocols. The simplicity of the operation of Layer 2 is one of the most essential advantages of CDP. Therefore, it works on different subnets without depending on IP addressing. Moreover, we provide a wide range of device discovery without any configuration changes or additional routing. In short, it is indispensable for network administrators in large and dynamic networks.

Question 3

Why do we need CDP?

Accepted Answer

Cisco networks first provide us with hardware information. First, we can learn the status and operational information of network devices. In this way, we can have up-to-date information about the equipment. Secondly, with this protocol, we can troubleshoot network problems more efficiently. In fact, when problems occur, we can quickly identify surrounding devices. Moreover, by monitoring connections, we can soon identify misconfigurations.

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