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Zorluk: OrtaLayer 2 Discovery Protocols (CDP and LLDP)

Match each Layer 2 discovery protocol characteristic or configuration parameter on the left with its corresponding description or default value on the right.

  • IEEE 802.1ABOpen vendor-neutral standard specification for Link Layer Discovery Protocol
  • CDP default holdtime180 seconds
  • LLDP default reinitialization delay2 seconds
  • lldp runGlobal configuration command used to enable LLDP on a Cisco switch

Cevap

IEEE 802.1AB matches the open vendor-neutral standard specification for LLDP. CDP default holdtime matches 180 seconds. LLDP default reinitialization delay matches 2 seconds. 'lldp run' matches the global configuration command used to enable LLDP on a Cisco switch.
IEEE 802.1AB is the official open standard defining LLDP. CDP defaults to an advertisement interval of 60 seconds and a holdtime of 180 seconds. The LLDP reinitialization delay defaults to 2 seconds on Cisco switches. Enabling LLDP globally requires the 'lldp run' global configuration command.

Adım Adım Çözüm

1
Identify the standard governing LLDP.
IEEE 802.1AB is the formal IEEE standard for LLDP, distinguishing it from Cisco proprietary CDP.
Knowledge of protocol standardization helps determine multi-vendor interoperability.
2
Determine the default CDP timer values.
CDP sends advertisements every 60 seconds and maintains a holdtime of 180 seconds by default.
Timer parameters ensure neighbor records persist across three missed advertisement intervals.
3
Identify default LLDP operational timers.
The LLDP reinitialization delay (lldp reinit) defaults to 2 seconds, which delays LLDP initialization on an interface after a state change.
Understanding default timer settings is critical for troubleshooting protocol behavior and flapping links.
4
Verify global configuration syntax for LLDP activation.
The command 'lldp run' enables LLDP globally on Cisco IOS switches.
LLDP is disabled by default on some Cisco platforms or software versions, requiring global activation before interface commands take effect.

Anahtar Kavram

Layer 2 Discovery Protocol Standards, Timers, and Configuration Commands
Tahmini Süre:1m 30s
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Konular

Layer 2 Discovery Protocols (CDP and LLDP)

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