STP Basics and Concepts 3

Question 1

Which IEEE standard introduced Rapid Spanning Tree Protocol (RSTP)?

Accepted Answer

IEEE 802.1w

Answer

IEEE 802.1D

Answer

IEEE 802.1s

Answer

IEEE 802.1Q

Question 2

What is the purpose of the Topology Change Notification (TCN) BPDU in STP?

Accepted Answer

To signal that the network topology has changed

Answer

To elect a new root bridge

Answer

To advertise port costs

Answer

To reset bridge priorities

Question 3

How many seconds does it take for a classic STP port to transition from Blocking to Forwarding by default?

Accepted Answer

50 seconds

Answer

15 seconds

Answer

20 seconds

Answer

30 seconds

Question 4

Which STP port role is used to block traffic and prevent switching loops on non-root, non-designated ports?

Accepted Answer

Alternate port

Answer

Root port

Answer

Designated port

Answer

Backup port

Question 5

What does STP use path cost to determine?

Accepted Answer

The best path to the root bridge

Answer

The speed of BPDU transmission

Answer

The number of VLANs on a trunk

Answer

The bridge priority increment

Question 6

Which condition causes a non-root switch to generate a TCN BPDU?

Accepted Answer

A port transitions from Blocking to Forwarding or from Forwarding to Blocking

Answer

The hello timer expires

Answer

A new VLAN is added

Answer

The bridge priority changes

Question 7

What is the maximum number of switches (hops) STP supports by default before a BPDU is considered stale?

Accepted Answer

20

Answer

7

Answer

10

Answer

64