What HA modes are supported by MEF SD-WAN in terms of tunnel usage?

• A. Active/Active and Active/Passive.
• B. Passive/Passive only.
• C. Active/Active with no failover.
• D. Sequential routing with no redundancy.

Answer: (A)

MEF SD-WAN supports two HA modes for how tunnels are used: both tunnels can be active at the same time (Active/Active), or one tunnel can be active with a second tunnel as a standby (Active/Passive).

In Active/Active, traffic is distributed across both tunnels, providing higher throughput and automatic resilience because both paths carry data. In Active/Passive, the primary tunnel handles traffic under normal conditions, and if it fails, the backup tunnel takes over seamlessly to maintain connectivity.

Phrases like Passive/Passive imply no active paths at all, which isn’t practical for HA. Active/Active with no failover ignores the failover capability that HA provides, and sequential routing with no redundancy lacks the redundancy that MEF SD-WAN aims to deliver.