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Difficulty: EasyLayer 2 Discovery Protocols (CDP and LLDP)

A network engineer needs to implement an open standard, vendor-neutral Layer 2 neighbor discovery protocol across a mixed enterprise network containing both Cisco and non-Cisco devices. Which protocol defined under IEEE 802.1AB meets this requirement?

  1. Link Layer Discovery Protocol (LLDP)Answer
  2. B
    Cisco Discovery Protocol (CDP)
  3. C
    Virtual Router Redundancy Protocol (VRRP)
  4. D
    Spanning Tree Protocol (STP)

Answer

Link Layer Discovery Protocol (LLDP) is the IEEE 802.1AB standard protocol used for Layer 2 discovery in multi-vendor network environments.
Link Layer Discovery Protocol (LLDP) is defined by IEEE 802.1AB. It provides vendor-neutral Layer 2 neighbor discovery functionality, making it ideal for heterogeneous network environments with devices from multiple vendors.

Step-by-Step Solution

1
Identify the protocol requirements from the scenario.
The scenario specifies an open-standard, vendor-neutral Layer 2 discovery protocol governed by IEEE 802.1AB.
Multivendor environments cannot rely on proprietary protocols like CDP across non-Cisco switches.
2
Evaluate candidate protocols against IEEE standards.
LLDP is explicitly defined under the IEEE 802.1AB standard for network device discovery.
LLDP allows heterogeneous network devices to advertise capabilities, management IP, and interface details across vendor boundaries.

Key Concept

Layer 2 Discovery Protocols: CDP vs. LLDP Standards
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Topics

Layer 2 Discovery Protocols (CDP and LLDP)

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