101 Question #14: Real Exam Question with Answer & Explanation

Question

Options

• Ato prevent ARP cache errors
• Bto minimize ARP entries on routers
• Cto minimize connection loss due to ARP cache refresh delays
• Dto allow both BIG-IP devices to simultaneously use the same MAC address

Explanation

MAC masquerading assigns a floating MAC address to the active BIG-IP device so that when failover occurs, upstream routers can update their ARP caches quickly, minimizing connection loss.

Common mistakes.

• A. MAC masquerading does not prevent ARP cache errors; it reduces the time routers need to learn the new MAC after failover, which is a latency and availability concern rather than an error prevention mechanism.
• B. MAC masquerading does not reduce the number of ARP table entries on routers; it ensures the floating MAC is quickly reassociated with the correct device, not that fewer entries are created.
• D. Both BIG-IP devices do not simultaneously use the same MAC address; only the currently active device uses the masquerade MAC, and it transfers exclusively to the new active device upon failover.

Concept tested. F5 BIG-IP MAC masquerading for HA failover continuity

Reference. https://support.f5.com/csp/article/K13502

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