STP Questions CCNA 200-120

What value is primarily used to determine which port becomes the root port on each non-root switch in a
spanning-tree topology?

A. lowest port MAC address
B. port priority number and MAC address.
C. VTP revision number
D. highest port priority number.
E. path cost
Correct Answer: E


The path cost to the root bridge is the most important value to determine which port will become the root port
on each non-root switch. In particular, the port with lowest cost to the root bridge will become root port (on nonroot

Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choose two)

A. 802.1d
C. 802.1q

Correct Answer: AD

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

A. after broken links are re-established
B. in an improperly implemented redundant topology
C. when upper-layer protocols require high reliability
D. during high traffic periods
E. when a dual ring topology is in use

Correct Answer:B

If we connect two switches via 2 or more links and do not enable STP on these switches then a loop (which
creates multiple copies of the same unicast frame) will occur. It is an example of an improperly implemented
redundant topology.

Which port state is introduced by Rapid-PVST?

A. learning
B. listening
C. discarding
D. forwarding
Correct Answer: C

Based on the information given, which switch will be elected root bridge and why?

A. Switch A, because it has the lowest MAC address
B. Switch A, because it is the most centrally located switch
C. Switch B, because it has the highest MAC address
D. Switch C, because it is the most centrally located switch
E. Switch C, because it has the lowest priority
F. Switch D, because it has the highest priority

Correct Answer: E

Which term describes a spanning-tree network that has all switch ports in either the blocking or forwarding

A. redundant
B. spanned
C. provisioned
D. converged

Correct Answer: D

Spanning Tree Protocol convergence (Layer 2 convergence) happens when bridges and switches have
transitioned to either the forwarding or blocking state. When layer 2 is converged, root bridge is elected and all
port roles (Root, Designated and Non-Designated) in all switches are selected.

Three switches are connected to one another via trunk ports. Assuming the default switch configuration, which
switch is elected as the root bridge for the spanning-tree instance of VLAN 1?

A. the switch with the highest MAC address
B. the switch with the lowest MAC address
C. the switch with the highest IP address
D. the switch with the lowest IP address

Correct Answer: B

Based on the network shown in the graphic

Which option contains both the potential networking problem and the protocol or setting that should be used to
prevent the problem?
A. routing loops, hold down timers
B. Switching loops, split horizon
C. routing loops, split horizon
D. Switching loops, VT
E. routing loops, STP
F. Switching loops, STP

Correct Answer: F


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