RSTP

Question 1

After the recent upgrade of the switching infrastructure, the network engineer notices that the port roles that were once “blocking” are now defined as “alternate” and “backup”. What is the reason for this change?
A. The new switches are using RSTP instead of legacy IEEE 802.1D STP.
B. IEEE 802.1D STP and PortFast have been configured by default on all newly implemented Cisco Catalyst switches.
C. The administrator has defined the switch as the root in the STP domain.
D. The port roles have been adjusted based on the interface bandwidth and timers of the new Cisco Catalyst switches.

Answer 1

A. The new switches are using RSTP instead of legacy IEEE 802.1D STP.

Question 2

What happens on a Cisco switch that runs Cisco IOS when an RSTP-configured switch receives 802.1d BPDU?
A. 802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives an 802.1d BPDU, it responds with an 802.1d BPDU and eventually the two switches run 802.1d to communicate.
B. 802.1d understands RSTP BPDUs because they are the same version, but when a RSTP switch receives a 802.1d BPDU, it responds with a 802.1d BPDU and eventually the two switches run 802.1d to communicate.
C. 802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives a 802.1d BPDU, it does not respond with a 802.1d BPDU.
D. 802.1d understands RSTP BPDUs because they are the same version, but when a RSTP switch receives a 802.1d BPDU, it does not respond with a 802.1d BPDU and eventually the two switches run 802.1d to communicate.

Answer 2

A. 802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives an 802.1d BPDU, it responds with an 802.1d BPDU and eventually the two switches run 802.1d to communicate.

Question 3

Which statement is true about RSTP topology changes?
A. Only nonedge ports moving to the blocking state generate a TC BPDU.
B. Any loss of connectivity generates a TC BPDU.
C. Any change in the state of the port generates a TC BPDU.
D. Only nonedge ports moving to the forwarding state generate a TC BPDU.
E. If either an edge port or a nonedge port moves to a block state, then a TC BPDU is generated.

Answer 3

D. Only nonedge ports moving to the forwarding state generate a TC BPDU.

Question 4

RSTP is running on a switch while PVST+is running on another switch in a network. What will happen when they are connected?
A. Both will run PVST+
B. Both will run RSTP
C. STP will stop operating
D. Old switch will run RSTP and the new switch will run PVST+

Answer 4

A. Both will run PVST+

Question 5

Relationship between RSTP and spanning-tree?
A. RSTP is compatible with STP
B. RSTP is not backward compatible with STP
C. It will create STP instance per vlan

Answer 5

A. RSTP is compatible with STP

Question 6

Which feature is new in RPVST+?
A. BackboneFast is implemented.
B. UplinkFast is implemented.
C. Only the root bridge sends configuration BPDUs.
D. All Switches can generate and send BPDUs.

Answer 6

D. All Switches can generate and send BPDUs.