In the following about dual-link backup networking, which of the following description is wrong?

Question

Options

• ADual-link backup technology improves network reliability at important network nodes and ensures
• BThe backup AC must always be powered on
• CIn the process of establishing active and standby links between the AP and the active and standby
• DThe network service configuration on the active and standby ACs should be consistent

• A
  15% (7)
• B
  4% (2)
• C
  74% (35)
• D
  6% (3)

Explanation

Option C is the wrong description because in dual-link backup networking, the AP establishes and maintains CAPWAP tunnels with both the active and standby ACs simultaneously, not in a sequential or conditional process. The statement in C misrepresents this parallel link establishment, which is the core mechanism that enables rapid failover without service interruption.

Option A is correct and not the answer because improving network reliability at critical nodes is precisely the design goal of dual-link backup technology. Option B is correct because the standby AC must remain powered on at all times to be ready for immediate takeover if the active AC fails - a powered-off standby cannot provide meaningful redundancy. Option D is correct because configuration consistency between both ACs is essential; if the standby AC had different service settings, a switchover would cause configuration mismatches and disrupt network services.

Memory tip: Think of dual-link backup like two power outlets wired in parallel - both are "live" at the same time, not one waiting for the other to fail first. Any answer suggesting a sequential or conditional link establishment process is describing how single-link failover works, not true dual-link backup.

No community discussion yet for this question.