Cisco Implementing Cisco Switched Networks

1.

Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) algorithm, and warrants the use multiple spanning-trees?

IEEE 802.1s (MST) IEEE 802.1Q (CST) Cisco PVST+ IEEE 802.1d (STP)

2.

Which statement is true about RSTP topology changes?

Only nonedge ports moving to the blocking state generate a TC BPDU. Any loss of connectivity generates a TC BPDU. Any change in the state of the port generates a TC BPDU. Only nonedge ports moving to the forwarding state generate a TC BPDU. If either an edge port or a nonedge port moves to a block state, then a TC BPDU is generated.

3.

Which of the following conditions guarantees that a broadcast storm cannot occur?

a native VLAN mismatch on either side of an 802.1Q link BPDU filter configured on a link to another switch Spanning Tree Protocol enabled on both Layer 2 and multilayer switches PortFast enabled on all access and trunk ports

4.

Which of the following will generate an RSTP topology change notification?

an edge port that transitions to the forwarding state a non-edge port that transitions to the blocking state a non-edge port that transitions to the forwarding state an edge port that transitions to the blocking state any port that transitions to the blocking state

5.

What is the effect of configuring the following command on a switch?
Switch(config)# spanning-tree portfast bpdufilter default

If BPDUs are received by a port configured for PortFast, then PortFast is disabled and the BPDUs are processed normally. If BPDUs are received by a port configured for PortFast, they are ignored and none are sent. If BPDUs are received by a port configured for PortFast, the port will transition to forwarding state. The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.

6.

Switch R1 has been configured with the root guard feature. What statement is true if the spanning tree enhancement Root Guard is enabled?

If BPDUs are not received on a non-designated port, the port is moved into the STP loop-inconsistent blocked state If BPDUs are received on a PortFast enabled port, the port is disabled. If superior BPDUs are received on a designated port, the interface is placed into the root-inconsistent blocked state. If inferior BPDUs are received on a root port, all blocked ports become alternate paths to the root bride.

7.

How does VTP pruning enhance network bandwidth?

by restricting unicast traffic to across VTP domains by reducing unnecessary flooding of traffic to inactive VLANs by limiting the spreading of VLAN information by disabling periodic VTP updates

8.

VTP devices in a network track the VTP revision number. What is a VTP configuration revision number?

A number for identifying changes to the network switch. A number for identifying changes to the network router. A number for identifying changes to the network topology.

9.

Switch R1 is configured to use the VLAN Trunking Protocol (VTP). What does R1 advertise in its VTP domain?

The VLAN ID of all known VLANs, the management domain name, and the total number of trunk links on the switch. The VLAN ID of all known VLANs, a 1-bit canonical format (CF1 Indicator), and the switch configuration revision number. The management domain name, the switch configuration revision number, the known VLANs, and their specific parameters. A 2-byte TPID with a fixed value of 0

10.

What action should a network administrator take to enable VTP pruning on an entire management domain?

Enable VTP pruning on any switch in the management domain. Enable VTP pruning on any client switch in the management domain. Enable VTP pruning on a VTP server in the management domain. Enable VTP pruning on every switch in the management domain. Disable VTP pruning on a VTP server in the management domain.

Cisco Implementing Cisco Switched Networks

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