In VRRP, when devices in the same backup group perform VRRP packet authentication, which of the following parameters will not affect the authentication success or failure between the master device…

Question

Options

• AAuthentication method
• BAuthentication word
• CVRID
• DVRRP version

• A
  13% (2)
• B
  7% (1)
• C
  73% (11)
• D
  7% (1)

Explanation

VRID (Virtual Router ID) does not affect authentication because it is the group identifier that determines which VRRP group a device belongs to - not whether authentication between devices in that group succeeds. Since the question already specifies devices are in the same backup group, they inherently share the same VRID; VRID plays no role in validating credentials between peers.

Why the distractors are wrong:

• A (Authentication method): Both master and backup must use the same method (none, plain-text, or MD5); a mismatch causes authentication failure.
• B (Authentication word): This is the shared password/key; if it differs between devices, authentication fails regardless of method.
• D (VRRP version): VRRPv2 supports authentication, while VRRPv3 removed it; mismatched versions can prevent successful authentication or protocol communication entirely.

Memory tip: Think of VRID as the "room number" - it only determines where devices meet, not whether they can prove their identity once there. Authentication lives in the method, word, and version - the actual handshake parameters.

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