ICND1 Spanning Tree Protocol (STP) 2

Question 1

On a non-root switch, which port provides the best path toward the Root Bridge?

Accepted Answer

Root Port

Answer

Each non-root switch has exactly one Root Port, which is the port with the lowest accumulated path cost to the Root Bridge.

Question 2

The Bridge ID used in STP elections is composed of which two elements?

Accepted Answer

Bridge priority and MAC address

Answer

The 8-byte Bridge ID combines a 2-byte configurable bridge priority and the 6-byte MAC address burned into hardware.

Question 3

What is the IEEE STP path cost assigned to a 100 Mbps Fast Ethernet link?

Accepted Answer

19

Answer

The IEEE 802.1D long-mode STP path cost for a 100 Mbps Fast Ethernet link is 19; lower bandwidth results in higher cost.

Question 4

What is the default value of the STP Forward Delay timer?

Accepted Answer

15 seconds

Answer

The Forward Delay timer defaults to 15 seconds and applies to both the Listening state and the Learning state.

Question 5

Which STP port state receives BPDUs but blocks all user data traffic?

Accepted Answer

Blocking

Answer

A port in Blocking state receives and processes BPDUs to remain aware of topology changes but discards all user data frames.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test