Match the following backup technologies to ensure the reliability of machine A's network with their corresponding features.

Question

Options

• AVRRP dual-machine hot backup matches Fastest active/standby switchover; Dual link hot backup matches The slowest master/standby switchover; Dual link cold backup matches Does not support remote deployment; N+1 backup matches The active and standby ACs can be deployed on different physical devices, but the software versions of the ACs must be the same.
• B
• C
• D

• A
  77% (23)
• B
  3% (1)
• C
  13% (4)
• D
  7% (2)

Explanation

Option A is correct because it accurately maps each backup technology to its defining characteristic: VRRP operates at the protocol level with near-instantaneous failover (sub-second), making it the fastest; dual link hot backup involves link-level synchronization overhead that makes its switchover comparatively slower despite both ends being active; dual link cold backup requires local co-location because the standby isn't pre-synchronized, ruling out remote deployment; and N+1 backup (one standby serving multiple active ACs) demands identical software versions across devices to ensure seamless state transfer. Since options B, C, and D are not provided, the only complete and coherent matching set is A - any alternative arrangement would pair features with technologies that contradict their technical design.

Memory tip: Think of it as a speed ladder - VRRP (protocol-level) is fastest, dual link hot is next, cold backup is slowest/most restrictive; and for N+1, remember "N units sharing one spare means the spare must speak the same language (version)" as the actives.

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