Network administrators must understand the key attributes, IEEE standards, and default operational parameters of Layer 2 discovery protocols when configuring enterprise switches. Match each Layer 2 discovery protocol characteristic on the left with its corresponding protocol specification or value on the right.
- IEEE 802.1ABThe open IEEE standard defining Link Layer Discovery Protocol (LLDP)
- CDP Default Advertisement Interval60 seconds
- LLDP Default Holdtime120 seconds
- Cisco Discovery Protocol (CDP)Cisco-proprietary Layer 2 discovery protocol enabled by default on Cisco Catalyst switches
Cevap
IEEE 802.1AB matches the open IEEE standard defining LLDP; CDP Default Advertisement Interval matches 60 seconds; LLDP Default Holdtime matches 120 seconds; Cisco Discovery Protocol (CDP) matches the Cisco-proprietary Layer 2 discovery protocol enabled by default on Cisco Catalyst switches.
Each item accurately corresponds to its defining standard, default timer, or vendor status. IEEE 802.1AB specifies LLDP; CDP advertises every 60 seconds; LLDP retains neighbor entries for a default holdtime of 120 seconds (30s x 4); and CDP is a Cisco-proprietary protocol enabled out of the box.
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Layer 2 Discovery Protocols (CDP and LLDP) Timers and Standards
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