What is the limitation of two units per HA pair in BIG-IP APM configurations?

Question

Options

• AIt restricts the number of concurrent user sessions allowed.
• BIt limits the number of access profiles that can be deployed.
• CIt reduces the maximum number of virtual servers that can be configured.
• DIt restricts the number of BIG-IP devices that can participate in HA.

• A
  9% (2)
• B
  4% (1)
• D
  87% (20)

Explanation

In BIG-IP, HA is architected as a pair - exactly two devices in an active/standby or active/active relationship. The "two units per HA pair" limitation means you simply cannot add a third, fourth, or more BIG-IP devices into a single HA group; the platform's HA mechanism is structurally capped at two participants. This is a topological constraint on device count, making D the direct and correct interpretation.

Why the distractors are wrong:

• A is wrong because concurrent session limits are governed by APM licensing (e.g., the number of Access sessions purchased), not by HA topology.
• B is wrong because access profile deployment limits relate to configuration capacity and licensing, not the number of HA members.
• C is wrong because virtual server counts are constrained by hardware resources and licensing tiers, independent of whether the device is in an HA pair.

Memory tip: The word "pair" is your clue - a pair is always two. If you see "HA pair limitation," think device count = 2, not sessions, profiles, or virtual servers.

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