Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 48

Which STP feature can reduce TCNs on ports that are connected to end devices?

Answer options

• A. BPDU guard
• B. Root guard
• C. PortFast
• D. BackboneFast

Correct answer: C

Explanation

PortFast is designed to enable ports connected to end devices to bypass the listening and learning states of STP, which reduces the time it takes for the port to transition to the forwarding state. This feature effectively minimizes the generation of TCNs by avoiding unnecessary state changes when a device connects or disconnects. The other options, while useful in different contexts, do not specifically address the reduction of TCNs on end device ports.