1. Which protocol extends the IEEE 802.1w Rapid Spanning Tree (RST) algorithm to multiple spanning-trees?
PVST+
PVST
IEEE 802.1q (CST)
IEEE 802.1s (MST)
2. Which two benefits are provided by MST as it is used with RSTP? (Choose two.)
load balancing
multiple spanning trees with ISL trunking
rapid router redundancy
rapid ISL convergnece
subsecond reconvergence
3. In which port role do both IEEE 802.1D (STP) and IEEE 802.1w (RSTP) designate a bridge port that is receiving a BPDU with the lowest BID, assuming that no other port receives a BPDU with the same BID?
backup port
alternate port
designated port
root port
4. What is an advantage of having multiple VLAN spanning-tree instance assignments located in different parts of the network?
makes it easier to administer and utilize redundant paths
makes it more simple to implement STP design
allows all instances to share the same designated bridge
makes it easier to separate PVST and CST spanning-trees
5. Refer to the exhibit. Which two statements about the spanning-tree operation are true? (Choose two.)
ACSW1 will become the root bridge.
DISW1 will become the root bridge.
DISW2 will become the root bridge.
ACSW1 will become the backup root bridge.
DISW1 will become the backup root bridge.
DISW2 will become the backup root bridge.
6. Refer to the exhibit. Switch A is connected to hub B via port P1. A second link is added on port P2 and configured for PortFast. Immediately after the new link came up, users could not access network resources. What caused this problem?
A Layer-2 loop was created.
Port P1 and P2 both entered the STP blocking state.
Hub B placed both uplink ports in the STP blocking state.
PAgP failed to properly negotiate the EtherChannel.
7. Refer to the exhibit. The four Cisco Catalyst switches must support several VLANs as identified in the exhibit. Which mode of STP would efficiently support this network?
RSTP
PVST
STP+
VSTP
CSTP
8. Refer to the exhibit. Interface Fa0/1 and Fa0/2 on the SW1 switch have been configured to support PAgP desirable mode. Which two modes can be configured on the interconnecting SW2 interfaces to successfully establish an EtherChannel? (Choose two.)
off
auto
on
desirable
9. What happens when a switch receives a topology change message from the root bridge?
The switch uses the forward delay timer to age out entries in the MAC address table.
The switch uses the max_age timer to age out entries in the MAC address table.
The switch uses the hello to age out entries in the MAC address table.
The switch uses the forward delay and the max_age timer to age out entries in the MAC address table.
10. Which STP timer defines the length of time spent in the listening and learning states?
hello time
forward aging
forward delay
max age
max delay
11. Refer to the exhibit. Given the output generated by the show spanning-tree mst configuration command, which two statements are true? (Choose two.)
The switch has automatically incremented the MST revision number to 11.
The MST region name was configured with the name CAMPUS1 global configuration command.
The switch requires the spanning-tree mode mst global configuration command to enable MST.
The switch was configured with the spanning-tree mst 1 root primary MST configuration command.
VLANs 1 through 10 have been configured with the instance 1 vlan 1-10 MST configuration command.
12. Which three statements regarding RSTP edge ports are true? (Choose three.)
Edge ports can have another switch connected to them as long as the link is operating in full duplex.
Edge ports function similarly to UplinkFast ports.
Edge ports immediately transition to learning mode and then forwarding mode when enabled.
Edge ports never generate topology changes notifications (TCNs) when the port transitions to a disabled or enabled status.
Edge ports should never connect to another switch.
If an edge port receives a BPDU, it becomes a normal spanning-tree port.
13. Refer to the exhibit. Which two statements regarding EtherChannels are true? (Choose two.)
The configurations could create a Link Aggregation Control Protocol (LACP) EtherChannel in a mixed switch environment.
The configurations could create a Port Aggregation Protocol (PAgP) EtherChannel between two Cisco Catalyst 3560 switches.
The configuration on switch SW1 assigns Gigabit Ethernet interfaces 0/1 and 0/2 as static-access ports in VLAN 10 to channel 5 with the LACP mode set to desirable.
The channel-group interface configuration command automatically creates the port-channel logical interface.
The configurations would not create an EtherChannel interface since the port-channel modes are not both set to auto.
14. Which two port states will immediately transition to the forwarding state when Rapid STP (RSTP) converges in a switched network? (Choose two.)
root port
designated port
alternate port
backup port
disabled port
blocking port
15. Refer to the exhibit. Switch Sw_F recently joined the network. What will happen once STP has finished its convergence?
Switch Sw_F will become the root bridge for its respective VLANs.
Switch Sw_C will remain the root bridge for its respective VLANs.
Switch Sw_D will remain the root bridge for its respective VLANs.
Switch Sw_F will become the backup root bridge for its respective VLANs.
Switch Sw_B will remain the backup root bridge for its respective VLANs.
16. Which type of BPDU is sent out of the root port when a link failure in a switched environment has occurred?
Link Change Notification
Link Detection Notification
Topology Link Notification
Topology Change Notification
17. Assuming all switches are at default priority, which of the following is true about applying this configuration command on a Catalyst 3550 switch?
3550switch(config)# spanning-tree vlan 23 root primary
guarantees that this switch will be the primary root on all VLANs
sets the switch priority for VLAN 23 to 24576
guarantees that this switch will not be the primary root on VLAN 23
sets the switch priority to 0
sets the switch priority to 23
18. Given the topology in the exhibit, which configuration will ensure the least amount of convergence time in the event of a port failure followed by recovery of the port?
On the Access1 switch, configure the Fa 0/1 interface with the spanning-tree mode portfast command.
On the Access1 switch, configure the Fa 0/2 interface with the spanning-tree portfast command.
On the Access2 switch, configure the Fa 0/1 interface with the spanning-tree mode portfast command.
On the Access2 switch, configure the Fa 0/2 interface with the spanning-tree portfast command.
On the Dist1 switch, configure the Fa 0/1 port with the spanning-tree mode portfast command.
On the Dist1 switch, configure the Fa 0/2 port with the spanning-tree portfast command.
