Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 76

Which two statements about RPVST+ are true? (Choose two.)

Answer options

• A. It is incompatible with spanning-tree PortFast.
• B. It supports two STP instances per VLAN.
• C. It requires approximately 50 seconds to complete reconvergence.
• D. Backwards compatibility with 802.1d is not supported.
• E. It elects one root switch per VLAN instance.
• F. It automatically enables UplinkFast and BackboneFast. EF

Correct answer:

Explanation

The correct answers are E and B. RPVST+ elects one root switch per VLAN instance (E) and supports two STP instances per VLAN (B). Options A and D are incorrect because RPVST+ can work with PortFast and does offer some level of backward compatibility with 802.1d, while options C and F contain inaccuracies about reconvergence time and automatic feature activation.