ACSP Spanning Tree Protocol (STP) 2

Question 1

Which STP port state forwards BPDUs but discards user data frames and does not learn MAC addresses?

Accepted Answer

Listening

Answer

In the Listening state, a port sends and receives BPDUs to determine topology but does not forward data frames or learn MAC addresses.

Question 2

What is the default STP port cost for a 10 Gbps link using IEEE 802.1D-2004 long path cost values?

Accepted Answer

4

Answer

IEEE 802.1D-2004 assigns a long path cost of 4 to a 10 Gbps link, replacing the original short values.

Question 3

In MSTP, what is the name of the instance that all VLANs belong to by default before being mapped to an MST instance?

Accepted Answer

CIST (Common and Internal Spanning Tree)

Answer

The CIST is the spanning tree that interconnects all MST regions and the CST, and all VLANs default to MSTI 0 within it.

Question 4

Which RSTP port role replaces the STP Blocked port and provides an alternate path to the root bridge?

Accepted Answer

Alternate port

Answer

The RSTP Alternate port provides a redundant path to the root and can rapidly transition to Forwarding if the root port fails.

Question 5

What STP feature causes a switch port to immediately enter Forwarding state when connected to an end device, bypassing Listening and Learning states?

Accepted Answer

PortFast

Answer

PortFast enables edge ports to skip the Listening and Learning states and go directly to Forwarding, reducing connectivity delays for end hosts.

(ACSP) Aruba Certified Switching Professional Practice Test