CCNA 200 301 Questions // Question 024 // #ccna200301 #ccna #ccnaexam #ccna_questions

The correct answer is
1. cdp run
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The correct command to globally re-enable Cisco Discovery Protocol (CDP) on a Cisco device after it has been turned off is: “cdp run”

CDP is a Layer 2 Cisco proprietary protocol that enables network devices to share information about directly connected devices. When CDP is disabled globally using the no cdp run command, it completely turns off the protocol on the device, preventing any interfaces from sending or receiving CDP advertisements. To restore CDP functionality across all interfaces, the correct command is cdp run, which enables CDP at the global configuration level.
Once cdp run is applied, CDP starts operating on all interfaces by default unless it has been specifically disabled on an interface using no cdp enable.
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Why the Other Answers Are Incorrect:
1. enable cdp - Incorrect
This is not a valid IOS command. In Cisco IOS, global settings are typically configured in global configuration mode, and the correct syntax follows the format of -feature - action, such as cdp run. The command enable cdp does not exist in Cisco IOS and would result in an error.
2. cdp service - Incorrect
This is an incorrect and non-existent command. Cisco IOS does not use the keyword "service" to control CDP settings. While some Cisco services (like service timestamps or service password-encryption) use the service keyword, CDP is managed using cdp run at the global level and cdp enable at the interface level.
3. cdp enable - Incorrect
While this is a valid command, it does not enable CDP globally. The cdp enable command is used in interface configuration mode to enable CDP on a specific interface. If CDP is disabled globally (no cdp run), using cdp enable on an interface has no effect until cdp run is first executed at the global level. Therefore, this command alone cannot re-enable CDP across the entire device.

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Domain
Network Access

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