Which of the following descriptions about HSB is correct? (Multiple choice)

Question

Options

• AHSB backup can be divided into real-time backup, batch backup, and scheduled backup.
• BThe HSB jumper between the active and standby ACs is used to synchronize AP status, user
• CThe default heartbeat period of the HSB channel is 1
• DHSB heartbeat time and cycle can be modified on AC

• A
  78% (49)
• C
  22% (14)

Explanation

A is correct because HSB backup supports three modes: real-time backup (immediate sync on data change), batch backup (bulk synchronization of existing data), and scheduled backup (periodic sync at defined intervals).

B is correct because the HSB link (jumper) connecting the active and standby ACs is specifically designed to synchronize AP state, user session data, and other operational information so the standby can take over seamlessly.

D is correct because HSB heartbeat timing parameters - both the interval (time between beats) and the dead-count threshold (cycle) - are administrator-configurable on the AC, allowing tuning for different network environments.

C is wrong because the default HSB heartbeat period is 3 seconds, not 1. This is a classic exam trap that swaps the real default with a plausible-sounding value.

Memory tip: Think "3 is the heartbeat" - HSB uses a 3-second default heartbeat, and you get 3 correct answers (A, B, D). If you see "1 second" for HSB heartbeat on an exam, that's the distractor.

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