CCNP Switch Ch 4 (Incomp) Flashcards

Question 1

Q

Refer to the exhibit. What conclusion does the output support?

PortFast is enabled on interface Fa0/6.

IEEE 802.1w is enabled on VLAN 1.

The forward delay timer has been changed from the default value.

Standard IEEE 802.1D behavior is shown.

Answer

A

Standard IEEE 802.1D behavior is shown

Question 2

Q

Refer to the exhibit. Switch SW1 is receiving traffic from SW2. However, SW2 is not receiving traffic from SW1. Which STP feature should be implemented to prevent inadvertent loops in the network?

UDLD

PortFast

BPDU guard

BPDU filtering

Answer

A

UDLD

Question 3

Q

Refer to the exhibit. What two conclusions does the output show to be true? (Choose two.)

DLS1 is running IEEE 802.1s on instance 1.

DLS1 is running IEEE 802.1D on instance 1.

DLS1 is the root bridge for instance 1.

Interface Fa0/12 will move into the errdisable state if a BPDU is received.

Interfaces Fa0/1 through Fa0/6 are trunk ports.

Answer

A

DLS1 is running IEEE 802.1s on instance 1.

DLS1 is the root bridge for instance 1.

Question 4

Q

Which protocol extends the IEEE 802.1w Rapid Spanning Tree (RST) algorithm to multiple spanning trees?

STP

RSTP+

CST

MST

Answer

A

MST

Question 5

Q

Which interfaces should loop guard be enabled on?

root ports

designated ports

root port and alternate ports

ports configured with PortFast

root port and ports configured with PortFast

Answer

A

root port and alternate ports

Question 6

Q

What will happen when a BPDU is received on a loop guard port that is in a loop-inconsistent state?

The port will transition to blocking state.

The port will transition to forwarding state automatically.

The port will be disabled and the administrator must re-enable it manually.

The port will transition to the appropriate state as determined by the normal function of the spanning tree.

Answer

A

The port will transition to the appropriate state as determined by the normal function of the spanning tree.

Question 7

Q

Refer to the exhibit. After the sequence of commands is entered, how many VLANs will be assigned to the default instance?

4094

4064

4062

4061

Answer

A

4061

Question 8

Q

Which protocol should an administrator recommend to manage bridged links when the customer requires a fully redundant network that can utilize load balancing technologies and reconverge on link failures in less than a second?

IEEE 802.1Q (CST)

IEEE 802.1s (MST)

Cisco PVST+

IEEE 802.1D(STP)

Answer

A

IEEE 802.1s (MST)

Question 9

Q

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

Answer

A

forward delay

Question 10

Q

What three fields are included in a BPDU? (Choose three.)

bridge ID

STP ID

port ID

link-state ID

cost of path

Answer

A

bridge ID

port ID

cost of path

Question 11

Q

Refer to the exhibit. What implementation of spanning tree best describes the spanning-tree operational mode of the switch?

IEEE 802.1D

IEEE 802.w

IEEE 802.1s

PVRST+

Answer

A

IEEE 802.1D

Question 12

Q

Which two statements are true about the RSTP negotiations between switches? (Choose two.)

UplinkFast must be configured on all designated switches.

BackboneFast must be configured on all root switches.

Switches must be connected by a point-to-point link.

All ports that are directly connected to end stations must be enabled as designated ports.

It greatly improves the restoration times for any VLAN that requires a topology convergence due to link up.

Answer

A

Switches must be connected by a point-to-point link.

It greatly improves the restoration times for any VLAN that requires a topology convergence due to link up.

Question 13

Q

Refer to the exhibit. STP is enabled on all switches in the network. The port on switch A that connects to switch B is half duplex. The port on switch B that connects to switch A is full duplex. What are three problems that this scenario could create? (Choose three.)

Switch B will become the root switch.

Switch B may unblock its port to switch C, thereby creating a loop.

Switch A is performing carrier sense and collision detection, and switch B is not.

Autonegotiation results in both switch A and switch B failing to perform carrier sense.

BPDUs may not successfully negotiate port states on the link between switch A and switch B.

Spanning tree will keep re-calculating, thereby consuming all the CPU normally used for traffic.

Answer

A

Switch B may unblock its port to switch C, thereby creating a loop.

Switch A is performing carrier sense and collision detection, and switch B is not.

BPDUs may not successfully negotiate port states on the link between switch A and switch B.

Question 14

Q

What priority value should be entered on a switch, via thespanning-tree vlan 20 priorityprioritycommand, if the desired priority for VLAN 20 is 4116?

4116

4106

4096

32788

Answer

A

4096

Question 15

Q

Users complain that they lost connectivity to all resources in the network. A network administrator suspects the presence of a bridging loop as a root cause of the problem. Which two actions will determine the existence of the bridging loop? (Choose two.)

Confirm MAC port security is enabled on all access switches.

Check the port utilization on devices and look for abnormal values.

Verify that the management VLAN is properly configured on all root bridges.

Capture the traffic on the saturated link and verify if duplicate packets are seen.

Ensure that the root guard and loop guard are properly configured on all distribution links.

Answer

A

Check the port utilization on devices and look for abnormal values

Capture the traffic on the saturated link and verify if duplicate packets are seen.

Question 16

Q

Which statement is true about the Spanning Tree Protocol (STP)?

Each switch determines a designated port that provides the best path to the root switch.

The designated port will be on the switch with the best path to the root switch.

With each network change, the STP algorithm is run on all switches that have a root port.

A topology change will cause the switch where the change occurred to send messages about the change throughout the tree.

Answer

A

The designated port will be on the switch with the best path to the root switch.

Question 17

Q

Which three parameters should match all switches within an MST region? (Choose three.)

port costs on trunk ports

configuration name

revision number

trunk encapsulation method

bridge priority

VLAN-to-instance mappings

Answer

A

configuration name

revision number

VLAN-to-instance mappings

Question 18

Q

What effect does the global configuration commandspanning-tree portfast bpdufilter defaulthave when enabled on an access switch?

All PortFast enabled ports become designated ports.

All PortFast enabled ports start participating in the spanning-tree calculations.

All switch ports start filtering the superior BPDUs coming from other switches and the access switch becomes a root bridge.

All PortFast enabled ports stop sending BPDUs, but if a BPDU is received on the port, the port gets out of the PortFast state, thereby disabling the BPDU filtering.

Answer

A

All PortFast enabled ports stop sending BPDUs, but if a BPDU is received on the port, the port gets out of the PortFast state, thereby disabling the BPDU filtering.

Question 19

Q

What happens when a switch running IEEE 802.1D 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.

Answer

A

The switch uses the forward delay timer to age out entries in the MAC address table.

Question 20

Q

Refer to the exhibit. STP is configured on all switches in the network. Recently, the user on workstation A lost connectivity to the rest of the network. At the same time, the administrator received the console message: 
 
%SPANTREE-2-RX_PORTFAST:Received BPDU on PortFast enable port.Disabling 2/1 
 
What is the cause of the problem?

STP PortFast feature has been disabled on port 2/1.

STP PortFast feature has been enabled on port 2/1.

PAgP has removed port 2/1 from the EtherChannel bundle.

The STP PortFast BPDU Guard feature has disabled port 2/1 on the switch.

Answer

A

The STP PortFast BPDU Guard feature has disabled port 2/1 on the switch.

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CCNP Switch Ch 4 (Incomp) Flashcards

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