200-301 · Question #171
Which statement about Cisco Discovery Protocol is true?
The correct answer is A. It is a Cisco-proprietary protocol.. Cisco Discovery Protocol (CDP) is a proprietary Layer 2 protocol designed by Cisco to gather information about directly connected Cisco devices.
Question
Which statement about Cisco Discovery Protocol is true?
Options
- AIt is a Cisco-proprietary protocol.
- BIt runs on the network layer.
- CIt can discover information from routers, firewalls, and switches.
- DIt runs on the physical layer and the data link layer.
How the community answered
(22 responses)- A91% (20)
- B5% (1)
- C5% (1)
Why each option
Cisco Discovery Protocol (CDP) is a proprietary Layer 2 protocol designed by Cisco to gather information about directly connected Cisco devices.
CDP is a Cisco-proprietary protocol, meaning it only operates between Cisco devices and is not an open standard.
CDP operates at Layer 2 (Data Link Layer) of the OSI model, not the network layer (Layer 3).
CDP primarily discovers information from Cisco routers and switches, and some access points, but typically not firewalls from other vendors.
CDP runs on the data link layer (Layer 2) and gathers information about directly connected devices; it does not operate on the physical layer.
Concept tested: Cisco Discovery Protocol (CDP) characteristics
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/xe-3s/cdp-xe-3s-book/nm-cdp-cfg-xe.html
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