Exam A
QUESTION 1
Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these?
A. one global STP instance for all VLANs
B. one STP instance for each VLAN
C. one STP instance per set of VLANs
D. one STP instance per set of bridges
Correct Answer: C
QUESTION 2
Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D? (Choose two.)
A. Designated Root Cost
B. bridge ID priority
C. max age
D. bridge ID MAC address
E. Designated Root Priority
F. forward delay
Correct Answer: BD
QUESTION 3
If a port configured with STP loop guard stops receiving BPDUs, the port will be put into which state?
A. learning state
B. listening state
C. forwarding state
D. root-inconsistent state
Correct Answer: D
QUESTION 4
What is the purpose of the STP PortFast BPDU guard feature?
A. enforce the placement of the root bridge in the network
B. ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C. enforce the borders of an STP domain
D. ensure that any BPDUs received are forwarded into the STP domain
Correct Answer: C
QUESTION 5
When STP UplinkFast is enabled on a switch utilizing the default bridge priority, what will the new bridge priority be changed to?
A. 8192
B. 16384
C. 49152
D. 65535
Correct Answer: C
QUESTION 6
Which of these best describes the actions taken when a VTP message is received on a switch configured with the VTP mode “transparent”?
A. VTP updates are ignored and forwarded out all ports.
B. VTP updates are ignored and forwarded out trunks only.
C. VTP updates are made to the VLAN database and are forwarded out trunks only.
D. VTP updates are ignored and are not forwarded.
Correct Answer: B
QUESTION 7
The classic Spanning Tree Protocol (802.1D 1998) uses which sequence of variables to determine the best received BPDU?
A. 1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest port id, 4) lowest root path cost
B. 1) lowest root path cost, 2) lowest root bridge id, 3) lowest sender bridge id, 4) lowest sender port id
C. 1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest root path cost 4) lowest sender port id
D. 1) lowest root bridge id, 2) lowest root path cost, 3) lowest sender bridge id, 4) lowest sender port id
Correct Answer: D
QUESTION 8
Which three port states are used by RSTP 802.1w? (Choose three.)
A. Listening
B. Learning
C. Forwarding
D. Blocking
E. Discarding
F. Disabled
Correct Answer: BCE
QUESTION 9
Refer to the exhibit. Catalyst R is the root bridge for both VLAN 1 and VLAN 2. What is the easiest way to load-share traffic across both trunks and maintain redundancy in case a link fails, without using any type of EtherChannel link-bundling?
A. Increase the root bridge priority (increasing the numerical priority number) for VLAN 2 on Catalyst D so that port D2 becomes the root port on Catalyst D for VLAN 2.
B. Decrease the port priority on R2 for VLAN 2 on Catalyst R so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1.
C. Decrease the path cost on R2 on Catalyst R for VLAN 2 so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1.
D. Increase the root bridge priority (decreasing the numerical priority number) for VLAN 2 on Catalyst R so Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?
A. GE-1/2 and GE 2/1
B. GE-1/1 and GE-2/2
C. GE-3/2 and GE 4/1
D. no ports are in the blocking state
E. There is not enough information to determine which ports are in the blocking state.
Correct Answer: D