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200-301 · Question #187

What are two reasons a network administrator would use CDP? (Choose two.)

The correct answer is D. to verify Layer 2 connectivity between two devices when Layer 3 fails E. to obtain the IP address of a connected device in order to telnet to the device. Network administrators use CDP to discover information about directly connected Cisco devices, facilitating troubleshooting Layer 2 connectivity and identifying IP addresses for remote access.

Submitted by anna_se· Mar 5, 2026

Question

What are two reasons a network administrator would use CDP? (Choose two.)

Options

  • Ato verify the type of cable interconnecting two devices
  • Bto determine the status of network services on a remote device
  • Cto obtain VLAN information from directly connected switches
  • Dto verify Layer 2 connectivity between two devices when Layer 3 fails
  • Eto obtain the IP address of a connected device in order to telnet to the device
  • Fto determine the status of the routing protocols between directly connected routers

How the community answered

(65 responses)
  • A
    3% (2)
  • B
    14% (9)
  • C
    6% (4)
  • D
    75% (49)
  • F
    2% (1)

Why each option

Network administrators use CDP to discover information about directly connected Cisco devices, facilitating troubleshooting Layer 2 connectivity and identifying IP addresses for remote access.

Ato verify the type of cable interconnecting two devices

CDP does not provide information about the specific type of cable (e.g., straight-through, crossover, fiber type) used to interconnect devices.

Bto determine the status of network services on a remote device

CDP provides device identity, capability, and port information, but it does not detail the operational status of network services running on a remote device.

Cto obtain VLAN information from directly connected switches

While CDP provides switchport information, it does not typically provide detailed VLAN configuration specific to individual VLANs on directly connected switches.

Dto verify Layer 2 connectivity between two devices when Layer 3 failsCorrect

If Layer 3 connectivity (IP routing) fails, CDP can still operate at Layer 2 to verify that a physical connection exists and that the devices are exchanging CDP advertisements, confirming basic Layer 2 reachability.

Eto obtain the IP address of a connected device in order to telnet to the deviceCorrect

CDP provides information about directly connected devices, including their IP addresses, which can be useful for a network administrator to identify and then remotely connect (e.g., via Telnet or SSH) to the discovered device for further configuration or troubleshooting.

Fto determine the status of the routing protocols between directly connected routers

CDP is a discovery protocol for device information, not a tool for determining the operational status of routing protocols running between devices; that requires specific routing protocol commands.

Concept tested: Uses and capabilities of Cisco Discovery Protocol (CDP)

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

Topics

#CDP#Network discovery#Layer 2 troubleshooting

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