What protocol sends periodic advertisements between connected Cisco devices in order to learn device name, IOS version, and the number and type of interfaces?

Last Updated: May 9, 2026
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What protocol sends periodic advertisements between connected Cisco devices in order to learn device name, IOS version, and the number and type of interfaces?

  • CDP
  • SNMP
  • NTP
  • LLDP

Explanation: Cisco Discovery Protocol (CDP) is a Cisco proprietary Layer 2 protocol that runs on all Cisco devices. It sends periodic advertisements to physically connected Cisco neighbors to share critical information, including the device name (hostname), the hardware platform, the IOS version, and the number and type of interfaces. While LLDP performs similar functions, it is a vendor-neutral protocol, whereas CDP is specifically designed for connected Cisco equipment.

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