You are on page 1of 10

Take Assessment - SWITCH Chapter 3 - CCNP SWITCH (Version 6.

0)

T 7180993 o p Time Remaining: o f 01:59:41 F o Bottom of Form r m

1

Top of Form

One switch in a Layer 2 switched spanning-tree domain is converted to PVRST+ using the spanning-tree mode rapid-pvst global configuration mode command. The remaining switches are running PVST+. What is the effect on the spanning-tree operation? Spanning tree is effectively disabled in the network. The PVRST+ switch forwards 802.1D BPDUs, but does not participate as a node in any spanning tree. All switches default to one 802.1D spanning tree for all VLANs. The PVSRT+ reverts to PVST+ to interoperate with the PVST+ switches.
Bottom of Form

2

Top of Form

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.

and switch B is not. thereby consuming all the CPU normally used for traffic. thereby creating a loop. Bottom of Form 3 STP RSTP+ CST MST Top of Form Which protocol extends the IEEE 802.) Switch B will become the root switch. BPDUs may not successfully negotiate port states on the link between switch A and switch B. Spanning tree will keep re-calculating. What are three problems that this scenario could create? (Choose three. Switch B may unblock its port to switch C. Autonegotiation results in both switch A and switch B failing to perform carrier sense.1w Rapid Spanning Tree (RST) algorithm to multiple spanning trees? Bottom of Form 4 Which statement is true about UDLD? It is automatically enabled.The port on switch B that connects to switch A is full duplex. Bottom of Form 5 Top of Form . It allows devices to transmit traffic one way. It allows a switch to detect a unidirectional link and shut down the affected interface. Top of Form It will disable an EtherChannel bundle if one link has failed. Switch A is performing carrier sense and collision detection.

w IEEE 802. the port transitions to the blocking state to prevent a root bridge election.1D IEEE 802. Top of Form Which two statements are true about STP root guard? (Choose two. Root guard should be configured on all ports on the desired root bridge to prevent another bridge from becoming the root. Bottom of Form 7 Top of Form . What implementation of spanning tree best describes the spanning-tree operational mode of the switch? IEEE 802. Root guard re-enables a switch port once it stops receiving superior BPDUs.) Root guard requires that PortFast be enabled on a switch port. If a root guard enabled port receives a inferior BPDU from a nonroot switch.Refer to the exhibit.1s PVRST+ Bottom of Form 6 Root guard is enabled on a per-port basis.

Users complain that they lost connectivity to all resources in the network. SW2 is not receiving traffic from SW1. Switch SW1 is receiving traffic from SW2. Which two actions will determine the existence of the bridging loop? (Choose two. Verify that the management VLAN is properly configured on all root bridges. Bottom of Form 8 Top of Form Refer to the exhibit. Ensure that the root guard and loop guard are properly configured on all distribution links. 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. Which STP feature should be implemented to prevent inadvertent loops in the network? UDLD PortFast BPDU guard BPDU filtering Bottom of Form 9 Top of Form .) Confirm MAC port security is enabled on all access switches. A network administrator suspects the presence of a bridging loop as a root cause of the problem. However.

What conclusion does the output support? PortFast is enabled on interface Fa0/6. The forward delay timer has been changed from the default value. Bottom of Form 10 hello time forward aging forward delay max age max delay Top of Form Which STP timer defines the length of time spent in the listening and learning states? Bottom of Form 11 port costs on trunk ports configuration name Top of Form Which three parameters should match all switches within an MST region? (Choose three.) .1w is enabled on VLAN 1. IEEE 802.1D behavior is shown.Refer to the exhibit. Standard IEEE 802.

Bottom of Form 13 Top of Form .1D on instance 1.) DLS1 is running IEEE 802.revision number trunk encapsulation method bridge priority VLAN-to-instance mappings Bottom of Form 12 Top of Form Refer to the exhibit. Interfaces Fa0/1 through Fa0/6 are trunk ports. DLS1 is the root bridge for instance 1. DLS1 is running IEEE 802.1s on instance 1. Interface Fa0/12 will move into the errdisable state if a BPDU is received. What two conclusions does the output show to be true? (Choose two.

What are three important steps in troubleshooting STP problems? (Choose three.) Administratively create bridge loops and see what path the traffic takes.1Q (CST) IEEE 802. Capture traffic on a saturated link and check whether identical frames are traversing multiple links.1D(STP) Bottom of Form 15 Top of Form . Administratively disable ports that should be blocking and check to see if connectivity is restored. Adjust BPDU timers so that there is less overhead traffic on the switching fabric. Bottom of Form 14 Top of Form 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 802.1s (MST) Cisco PVST+ IEEE 802. Check each side of a point-to-point link for duplex mismatch. Administratively disable multicasting and check to see if connectivity is restored.

how many VLANs will be assigned to the default instance? 4094 4064 4062 4061 16 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 Bottom of Form Bottom of Form Top of Form 17 Top of Form . After the sequence of commands is entered.Refer to the exhibit.

The switch uses the max-age timer to age out entries in the MAC address table. the user on workstation A lost connectivity to the rest of the network. the administrator received the console message: %SPANTREE-2-RX_PORTFAST:Received BPDU on PortFast enable port.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. PAgP has removed port 2/1 from the EtherChannel bundle.Disabling 2/1 What is the cause of the problem? STP PortFast feature has been disabled on port 2/1. Bottom of Form 18 Top of Form What happens when a switch running IEEE 802. . At the same time.) Top of Form An RSTP BPDU carries information about port roles and is sent to neighbor switches only. The STP PortFast BPDU Guard feature has disabled port 2/1 on the switch. STP is configured on all switches in the network. Recently. The switch uses the hello to age out entries in the MAC address table.1D. The switch uses the forward delay and the max-age timer to age out entries in the MAC address table. Bottom of Form 19 Which three statements about RSTP are true? (Choose three.Refer to the exhibit. STP PortFast feature has been enabled on port 2/1. RSTP elects a root bridge in exactly the same way as 802.

1w standard.RSTP is capable of reverting back to 802. The port will transition to forwarding state automatically. Top of Form What will happen when a BPDU is received on a loop guard port that is in a loop-inconsistent state? The port will be disabled and the administrator must re-enable it manually.1D but still maintains the benefits of 802. RSTP is recognized as the IEEE 802. and forwarding. Bottom of Form . UplinkFast and BackboneFast are compatible with RSTP. There are only three RSTP port states: discarding. The port will transition to the appropriate state as determined by the normal function of the spanning tree.1w. Bottom of Form 20 The port will transition to blocking state. listening.