Advanced Router Tech Midterm

When viewing the show etherchannel summary command output, what does the 'S' signify in the output of 'Po1 (SD)'?

Layer 2 EtherChannel

Which of the following are transitory IEEE 802.1D port states used only during the process of STP convergence? (Choose two answers.)

Listening Learning

The exhibit shows the output from commands that are issued on SW1 and SW2 in the figure. Assume that all STP parameters not implied by the text in the exhibit are default values, except for priority, where SW3 has a configured priority of 28,672. Which of the following commands would immediately change the topology of the spanning tree? (Choose three answers.)

The spanning-tree cost 1 command on SW2 under interface fa0/1 The spanning-tree vlan 1 priority 20480 global configuration command on SW2 The spanning-tree vlan 1 root primary command on SW3

Refer to the diagram and exhibit; which statements are true about the input shown?

The spanning-tree mode is Rapid STP.

Refer to the exhibit; assuming the switch is a 2960, which statements are true about the input shown? (Choose three answers.)

The switchport voice vlan 10 command is configured on the Gi0/2 interface. The switchport access vlan 5 command is configured on the Gi0/2 interface. The switchport mode dynamic desirable command is configured on the Gi0/2 interface.

A switch's _________ port is its interface through which it has the least STP cost to reach the root switch.

root

The only switch on a LAN that has all designated interfaces is the __________ switch.

root

What is the Cisco IOS command that can be used to display the current administrative and operational mode of a switch port?

show interfaces interface switchport

Which Cisco IOS command can be used to display the current administrative and operational state of an interface?

show interfaces interface switchport

Which Cisco IOS command can be used to determine the current operating trunks on a switch?

show interfaces trunk

Which Cisco IOS command can be used to display which VLANs are supported over a specific configured switch trunk?

show interfaces trunk

Which Cisco IOS command is used to display all the dynamic MAC address table entries on a switch?

show mac address-table dynamic

Which of the following commands list a nonroot switch's root cost? (Choose two answers.)

show spanning-tree show spanning-tree root

Which option(s) can be used to find the MAC address of the current root switch? (Choose two answers.)

show spanning-tree show spanning-tree root

Which Cisco IOS command would be used to display each VLAN and all interfaces assigned to it (minus trunks) on a switch? Each correct answer represents a complete solution. Choose two.

show switch vlan show vlan

Which Cisco IOS command is used to enable the use of the PortFast feature on a specific interface?

spanning-tree portfast

Which Cisco IOS command is used to enable the default use of the BPDU Guard feature?

spanning-tree portfast bpduguard default

What single Cisco IOS command can be issued to ensure that a specific switch within the network becomes the STP root switch?

spanning-tree vlan vlan-id root primary

On a 2960 switch, which of the following commands change the value of the bridge ID? (Choose two answers.)

spanning-tree vlan vlan-number root {primary | secondary} spanning-tree vlan vlan-number priority value

Refer to the diagram; which command would be used to configure the switch ports connecting to hosts A, B, C, and D to be permanent access ports?

switchport mode access

Which Cisco IOS command would be used to statically place an interface into Access mode?

switchport mode access

Which Cisco IOS command would be used to control which VLANs are permitted to cross an interface configured and operational as a trunk?

switchport trunk allowed vlan vlan-ids

Which Cisco IOS command is used to configure an interface to use VLAN 10 as its voice VLAN?

switchport voice vlan 10

Refer to the diagram; which commands would be required to configure all of the VLANs displayed on SW1?

vlan 5,10,20

Which Cisco IOS command is used to create a new VLAN on a switch?

vlan vlan-id

Which of the following are valid types of STP? (Choose four answers.)

802.1D Rapid PVST+ PVST+ 802.1w

What VLANs are included within the normal range?

1-1005

If an interface was used for STP that supported speeds of 10 Mbps, 100 Mbps, and 1 Gbps and is currently operational with a speed of 100 Mbps, what STP port cost is used for the interface?

19

What is the default IEEE STP port cost for a 100 Mbps Ethernet interface?

19

What is the default STP cost of an Ethernet interface that is operating at 100 Mbps?

19

What is the default IEEE STP port cost for a 10 Gbps Ethernet interface?

2

When influencing the STP priority by using the root command, what will the priority of the local switch become if all other switches have their default priorities?

24,576

Imagine a switch with three configured VLANs. How many IP subnets are required, assuming that all hosts in all VLANs want to use TCP/IP?

3

Refer to the figure. Based on the STP port costs shown, which of S4's interfaces will become the root port?

3

What is the default base STP priority used on a Cisco switch?

32,768

What is the size of the extra tag that is added to the Ethernet header when using 802.1Q tagging?

4 bytes

When configuring a switch with system ID extension enabled, what STP priority multiple must be used?

4096

SW2 is a nonroot switch with a 100-Mbps STP root port. A BPDU received on this port contains a root cost of 38. If SW2 advertises to another switch, what will the root cost be in the BPDU SW2 advertises?

57

The figure shows a LAN with three switches, a router using 802.1Q trunking, and VLANs 11 and 13. Subnet 10.1.1.0/24 is on VLAN 11, and subnet 10.1.3.0/24 is on VLAN 13. The STP topology has converged for each VLAN, with SW1 blocking on fa0/2 for VLAN 11, and SW2 blocking on fa0/3 for VLAN 13. Assume that the PCs and router have complete and full information in their ARP tables, and that all three switches have current and valid MAC address table entries for the MAC addresses of the PCs and the router. Under those conditions, which of the following statements best describes the MAC address tables used in each VLAN? (Choose three answers.)

A frame that R1 forwards to PC3 passes over the trunk from SW2 to SW1. When PC2 pings PC3, the ICMP Echo request passes through SW1 at some point. SW2's MAC table for VLAN 13 lists R1's MAC with interface fa0/11.

Which EtherChannel mode should be used if the intention is to have the targeted interfaces initiate a connection via LACP?

Active mode

A switch's G0/1 interface, a trunk that supports VLANs 1-10, has autonegotiated a speed of 100 Mbps. The switch currently has all default settings for STP. Which of the following actions results in the switch using an STP cost of 19 for that interface in VLAN 3? (Choose two answers.)

Adding no configuration spanning-tree cost 19

Which of the following is true about PortFast and BPDU Guard?

BPDU Guard shuts down a port if a BPDU is seen on that port.

Which of the following IEEE 802.1D port states are stable states used when STP has completed convergence? (Choose two answers.)

Blocking Forwarding

If spanning tree is disabled, what are the potential issues with a redundant Layer 2 network design? (Choose three answers.)

Broadcast storms MAC database instability Multiple (duplicate) frames being seen

Which of the following are functions provided by Spanning Tree Protocol? (Choose three answers.)

Prevents MAC table instability Prevents broadcast storms Prevents multiple copies of a single frame from being forwarded

What is the name of the protocol used on Cisco switches that provides a mechanism to negotiate the state of a VLAN trunk?

DTP

Which dynamic trunking mode should be configured if the intention is to have it actively attempt to form a trunk with a connected switch?

Desirable

What is the difference between EtherChannel auto and desirable modes?

Desirable will always initiate autonegotiation, whereas auto will not.

What is the name of the new RSTP port state that replaces the STP disabled and blocking states?

Discarding

Which of the following port states are used by 802.1w RSTP but not by 802.1D STP?

Discarding

Which statements are true about the implementation of VLANs without inter-VLAN routing? (Choose two answers.)

Each VLAN will be in its own broadcast domain. Each VLAN will only be able to communicate with members in the same VLAN.

Refer to the exhibit; which of the interfaces shown are likely connected to another switch? (Choose two answers.)

Gi0/2 Gi0/1

Switch SW1 sends a frame to switch SW2 using 802.1Q trunking. Which of the answers describes how SW1 changes or adds to the Ethernet frame before forwarding the frame to SW2?

Inserts a 4-byte header and does not change the MAC addresses

What is one way in which STP protects a redundant Ethernet network?

Protects against frames looping the Layer 2 domains

Refer to the diagram; assuming a default trunking configuration, what is the term that is used to reference the VLAN that will be used to transport the traffic between the hosts in the default VLAN?

Native

Which EtherChannel protocol is being used if the channel-group 10 mode on command is configured on an interface?

None

What is the correct order for the spanning-tree algorithm?

None of the answers provided are the correct order

Refer to the diagram; what is the name of the feature that can be implemented on the Layer 2 switches shown that would allow communications from the devices in VLAN 10 to VLAN 20?

None, because a Layer 3 device is required

On which switch would you always find a root port?

Nonroot switch

The ___________ feature enables a switch to transition a switchport from blocking to forwarding state quickly by bypassing the listening and learning states.

PortFast

What is the name of the revised and improved version of STP that has been standardized and is typically deployed on production networks?

RSTP

Which options are valid reasons to implement VLANs on a network? Each correct answer represents a complete solution. Choose two.

Reduces the STP workload Increases the number of broadcast domains

All switches are running rapid spanning-tree. SW1 and SW4 have been administratively configured with a spanning tree cost of 4 on each of their interfaces, with all other switch ports using default costs. Based on the partial output provided, which of the following port roles are accurate in regard to VLAN 1? (Choose two answers.)

SW1 FA0/23 will be a root port SW4 Fa0/21 will be a root port

Examine the output. The output comes from the show spanning-tree vlan 10 command taken from a Cisco Catalyst 2960 switch named SW1. Which of the following statements regarding SW1 is true, based on the output in the exhibit? (Choose two answers.)

SW1 is not the root switch. SW1 uses STP instead of RSTP in VLAN 10.

In the figure, in VLAN 1, all switches have default 802.1d STP settings, and all trunks are up. Which statements are true regarding the behavior of STP in this network, for VLAN 1, after the STP topology has stabilized? (Choose two answers.)

SW1 will create Hello messages regularly based on its Hello timer. SW3's fa0/1 interface will be in a forwarding state.

The figure shows a LAN with three switches, a router using 802.1Q trunking, and VLANs 11 and 13. Subnet 10.1.1.0/24 is on VLAN 11, and subnet 10.1.3.0/24 is on VLAN 13. The STP topology has converged for each VLAN, with SW3 blocking on fa0/1 for VLAN 11, and SW2 blocking on fa0/1 for VLAN 13. Assume that the PCs and router have complete and full information in their ARP tables and that all three switches have current and valid MAC address table entries for the MAC addresses of the PCs and the router. Under those conditions, which of the following statements best describes the MAC address tables used in each VLAN? (Choose two answers.)

SW1's MAC table for VLAN 11 lists PC2's MAC with interface fa0/2. SW1's MAC table for VLAN 11 lists R1's MAC with interface fa0/2.

The figure illustrates a small LAN, with some of the trunking-related information shown in the exhibit. All switches are 2960 switches, which default to an administrative setting of dynamic auto in regards to trunking. The desired goal is for trunking to work between each pair of switches. Which of the following statements is true regarding trunking? Assume that all commands shown in the answers are used in interface configuration mode unless otherwise noted, and that all configuration uses default settings unless otherwise implied by the exhibit. (Choose two answers.)

SW1's fa0/2 interface, connecting SW1 to SW2, trunks as long as the trunking mode is not set to access mode on SW1's fa0/2 interface. The link between SW2 and SW4 will not trunk.

All the ports in the topology are Fast Ethernet. Which of the following statements is true?

SW2 is not using spanning-tree defaults.

The figure shows a LAN with three switches, a router using 802.1Q trunking, and VLANs 11 and 13. Subnet 10.1.1.0/24 is on VLAN 11, and subnet 10.1.3.0/24 is on VLAN 13. The STP topology has converged for each VLAN, with SW3 blocking on fa0/1 for VLAN 11, and SW2 blocking on fa0/1 for VLAN 13. Assume that the PCs and router have complete and full information in their ARP tables, and that all three switches have current and valid MAC address table entries for the MAC addresses of the PCs and the router. Under those conditions, which of the following statements best describes the MAC address tables used in each VLAN? (Choose three answers.)

SW2's MAC table for VLAN 13 lists PC3's MAC with interface fa0/3. SW2's MAC table for VLAN 13 lists R1's MAC with interface fa0/11. A frame that R1 forwards to PC1 passes over the trunk from SW2 to SW1.

The exhibit shows a diagram of a small switched network, with all switches acting as layer 2 switches in VLAN 10. The diagram notes the switch chosen as root switch, with each root port noted with the letters RP and each designated port noted with the letters DP. All three switches use RSTP, and they might also have other RSTP configuration settings not noted in the question. Which of the following statements about RSTP states and roles in this network are true?

SW2's port Gi0/1 must be in an alternate port role.

Refer to the exhibit; switch SW3 is receiving only two hello BPDUs, both of which identify the same root switch, received on the two interfaces listed. SW3 has no STP-related configuration commands. The hello received on Fa0/13 lists root cost 10, and the hello received on Gi0/1 lists root cost 20. Which of the following is true about STP on SW3?

SW3 will choose Gi0/1 as its root port.

Look at the diagram and the exhibit. If you disable SW3's Fa0/19 and Fa0/22 interfaces, which of the following will occur? (Choose two answers.)

SW3's new cost to the root will be 57. SW3's root port will be Fa0/23.

In the figure, in VLAN 1, all switches have default 802.1d STP settings, and all trunks are up. Which statements are true regarding the behavior of STP in this network for VLAN 1 after the STP topology has stabilized? (Choose two answers.)

SW4's interface Fa0/1 will become the designated port on the link between SW1 and SW4. SW3's fa0/2 interface will be its root port.

Which of the following represents the total cost between the device forwarding a BPDU and the switch in STP that has the lowest BID?

Sender's root cost

Refer to the exhibit; which statements are true about the input shown? (Choose three answers.)

The Dynamic EtherChannel protocol configured is LACP. The Port Channel (EtherChannel) link is operational. The remote interface connected to SW2's Gi0/1 interface must be configured as passive.

Which of the following facts determines how often a nonroot bridge or switch sends an 802.1D STP Hello BPDU message?

The Hello timer as configured on the root switch.

Two switches are connected by four Fast Ethernet trunks. Four VLANs exist, with members of each VLAN on each of the two switches. The network engineer would like to have the switches treat all 4 trunks as a single 400 Mbps trunk, with some of the traffic being forwarded over each of the links between the switches. Which of the following statements is true of such a configuration? (Choose two answers.)

The four trunks can be placed into the same EtherChannel to achieve this goal. The show spanning-tree command will list the combined four links with an abbreviation of Po for PortChannel.

Examine the following extract from the show spanning-tree command on a Cisco switch: Which of the following answers is true about the switch on which this command output was gathered?

The information is about the STP instance for VLAN 3.

Which of the following are true statements about STP PortFast mode?

The port bypasses the normal STP startup process and enters forwarding mode immediately.

Refer to the exhibit; which statements are true about the output displayed? (Choose three answers.)

The port channel is only operational using a single interface. The port channel displayed is operational. This is a Layer 2 port channel.

Which of the following would be in a forwarding state in STP? (Choose two answers.)

The root port on a nonroot switch Designated ports

Examine the following first seven lines of output from the show spanning-tree command on a Cisco switch: Which of the following answers is true about the switch on which this command output was gathered?

This switch uses RSTP.

Refer to the exhibit. What information can be determined from the output of this command? Each correct answer represents a complete solution. Choose two.

This switch uses the default STP timers. This switch is NOT the VLAN 1 root switch

Which statements are common valid reasons why an engineer may want to implement VLANs on a network? (Choose three answers.)

To reduce the demand on the switch's processor To reduce the workload of the Spanning Tree Protocol (STP) To increase security for devices within the same VLAN

Refer to the exhibit; which statements are true about the input shown? (Choose two answers.)

Traffic on VLAN 20 will not be tagged when crossing the trunk. Traffic on VLAN 10 will not be allowed to cross the trunk.

Two switches are connected using a crossover cable. Using the combinations of configurations listed here (one on each end of the crossover cable on each switch), which of the following are accurate? (Choose two answers.)

Trunk and dynamic auto will end up in a trunk being formed. Dynamic desirable and dynamic auto will end up in a trunk being formed.

Which of the following are true? (Choose two answers.)

Trunks carry traffic for multiple VLANs only if those VLANs exist on the switch and are allowed on the trunked interfaces. Multiple Layer 2 interfaces can be bound together to increase the overall throughput.

Refer to the exhibit. What VLANs have been defined on the local switch and not shut down?

VLAN 1, 10, and 20

Refer to the diagram; what is the name of the process that is used to enable communications between the devices in the same VLAN across multiple switches?

VLAN tagging

What is true about the command switchport nonegotiate?

When used, if a connected switch is using dynamic desirable or dynamic auto, it will not form a trunk.

In what STP state does a port drop all received user traffic and not transmit user traffic but still listen for updated BPDUs?

blocking

Which Cisco IOS command would be used to enable an EtherChannel that utilized LACP and will automatically initiate a connection to the neighbor switch using a channel number of 10?

channel-group 10 mode active

Which Cisco IOS debug command is used to display log messages whenever STP performs changes to an interface's role or state?

debug spanning-tree events

The switch that has the lowest STP cost will become the __________ switch for a specific segment.

designated

Imagine that you are told that switch 1 is configured with the dynamic auto parameter for trunking on its Fa0/5 interface, which is connected to switch 2. You have to configure switch 2. Which of the following settings for trunking could allow trunking to work? (Choose two answers.)

dynamic desirable trunk