ENCOR 350-401- INFRASTRUCTURE- L2

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. Which two statements descibe the MST internal spanning tree instance? (Choose two)

A. It runs on all switch port interfaces of switches that are designated as root bridges.

B. It is always instance 0.

C. It carries identical setup information among interconnected MST regions.

D. It runs on all switch port interfaces of the switches in the MST region.

E. It carries all VLANs traffic.

Refer to the exhibit. An engineer configures a trunk between SW1 and SW2 but tagged packets are not passing. Which action fixes the issue?

A. Configure SW1 with dynamic auto mode on interface FastEthernet0/1.

B. Configure the native VLAN to be the same VLAN on both switches on interface FastEthernet0/1.

C. Configure SW2 with encapsulation dot1q on interface FastEthernet0/1.

D. Configure FastEthernet0/1 on both switches for static trunking.

None

In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

A. listening

B. disabled

C. learning

D. forwarding

E. blocking

Which protocol is required for Cisco Express Forwarding to be able to successfully forward packets on a multilayer switch?

A. VLAN Trunking Protocol

C. Cisco Discovery Protocol

D. Spanning Tree Protocol

E. Address Resolution Protocol

F. Dynamic Trunking Protocol

None

Which two statements describe the MST internal spanning tree instance? (Choose two)

A. It carries all VLANs traffic.

B. It carries identical setup information among interconnected MST regions.

C. It is always instance 0.

D. It runs on all switch port interfaces of switches that are designated as root bridges.

E. It runs on all switch port interfaces of switches in the MST region.

Refer to the exhibit. Which command or set of commands configures switch B as the primary root for VLANs 10, 15, and 20?

A. SwitchB(config-mst)# instance 1 vlan 10,20

B. SwitchB(config)# spanning-tree vlan 10,20 root primary

C. SwitchA(config-if)# spanning-tree port-priority 200

D. SwitchB(config)# spanning-tree mst 1 root primary

None

Which technology does CEF switching use on Cisco hardware-based routers to forward packets?

A. Router general-purpose CPU

B. InterVLAN routing using subinterfaces

C. Forwarding engines implemented in specialized ASICs

D. Route processors using stateful switchover

None

Refer to the exhibit. An engineer is configuring an EtherChannel between Switch1 and Switch2 and notices the console message on Switch2. Based on the output, which action resolves this issue?

A. Configure less member ports on Switch2.

B. Configure the same port channel interface number on both switches

C. Configure the same EtherChannel protocol on both switches

D. Configure more member ports on Switch1.

None

Which statement is true about the port roles of the 802.1w Rapid Spanning Tree Protocol?

A. Cisco-proprietary enhancements to the legacy 802.1D, such as UplinkFast and BackboneFast, are compatible with RSTP.

B. An alternate or backup port can immediately change to a forwarding state without waiting for the network to converge.

C. It takes an edge port 15 seconds to go from blocking to forwarding.

D. Ports are manually configured to be in the designated role

None

10.

Refer to the exhibit. An engineer attempts to configure a trunk between switch sw1 and switch SW2 using DTP, but the trunk does not form. Which command should the engineer apply to switch SW2 to resolve this issue?

A. switchport mode dynamic desirable.

B. switchport nonegotiate

C. no switchport

D. switchport mode access

None

11.

Which is a characteristic of EtherChannel?

A. STP treats all interfaces in an EtherChannel bundle as a single logical link.

B. EtherChannel uses physical ports that have been upgraded to provide a faster connection.

C. EtherChannel configuration is applied to each physical port.

D. STP will not block redundant EtherChannel bundles between two switches.

None

12.

Refer to the exhibit. Which two commands ensure that DSW1 becomes root bridge for VLAN 10? (Choose two.)

A. DSW1(config)#spanning-tree vlan 10 priority 4096

B. DSW1(config)#spanning-tree vlan 10 root primary

C. DSW2(config)#spanning-tree vlan 10 priority 61440

D. DSW1(config)#spanning-tree vlan 10 port-priority 0

E. DSW2(config)#spanning-tree vlan 20 priority 0

13.

Which LACP technology can identify and remove a LACP enabled link from an EtherChannel within three seconds when the link is experiencing connectivity issues?

A. LACP min-links

B. LACP port priority

C. LACP system priority

D. LACP fast

None

14.

Which two VTP modes allow for the creation, modification, and deletion of VLANs on the local switch? (Choose two.)

A. transparent

B. distribution

C. client

D. server

E. slave

F. master

15.

Which LACP technology is used for designating a specific number of member interfaces that must remain active in order for the EtherChannel bundle to be usable?

A. LACP port priority

B. LACP fast

C. LACP min-links

D. LACP system priority

None

16.

If left to default configuration settings, what will determine which switch becomes the spanning-tree root bridge in a Layer 2 domain?

A. The highest bridge priority

B. the lowest switch MAC address

C. The highest bridge ID

D. The highest management IP address

None

17.

A VoIP phone is plugged in to a port but cannot receive calls. Which of the following needs to be done on the port to address the issue?

A. Trunk all VLANs on the port.

B. Configure the native VLAN.

C. Tag the traffic to voice VLAN.

D. Disable VLANs.

None

18.

Why is it important that the network administrator consider the spanning-tree network diameter when choosing the root bridge?

A. BPDUs may be discarded because of expiring timers.

B. The network diameter limitation is 9.

C. The cabling distance between the switches is 100 meters.

D. Convergence is slower as the BPDU travels away from the root.

None

19.

. During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?

A. Each switch determines the best path to forward traffic.

B. All the switches send out BPDUs advertising themselves as the root bridge.

C. Each switch determines what port to block to prevent a loop from occurring.

D. Each switch with a lower root ID than its neighbor will not send BPDUs.

None

20.

Refer to the exhibit. The port channel between the switches does not work as expected. Which action resolves the issue?

A. Interface Gi0/0 on Switch2 must be configured as passive.

B. Interface Gi0/1 on Switch1 must be configured as desirable.

C. interface Gi0/1 on Switch2 must be configured as active.

D. Trucking must be enabled on both Interfaces on Switch2.

None

21.

Refer to the exhibit. Which two commands ensure that DSW1 becomes the root bridge for VLAN 10 and 20? (Choose two.)

A. spanning-tree mst 1 priority 1

B. spanning-tree mst 1 root primary

C. spanning-tree mstp vlan 10,20 root primary

D. spanning-tree mst vlan 10,20 priority root

E. spanning-tree mst 1 priority 4096

22.

Refer to the exhibit. An engineer implemented several configuration changes and receives the logging message on switch1. Which action should the engineer take to resolve this issue?

A. Change the VTP domain to match on both switches

B. Change Switch2 to switch port mode dynamic auto

C. Change Switch1 to switch port mode dynamic auto

D. Change Switch1 to switch port mode dynamic desirable

None

23.

Refer to the exhibit. Assuming all links are functional, which path does PC1 take to reach DSW1?

A. PC1 goes from ALSW1 to DSW2 to CORE to DSW1.

B. PC1 goes from ALSW1 to DSW2 to ALSW2 to DSW1.

C. PC1 goes from ALSW1 to DSW2 to DSW1.

D. PC1 goes from ALSW1 to DSW1.

None

24.

Which two statements are true about the 802.1Q trunking protocol? (Choose two.)

A. The native VLAN interface configurations must match at both ends of the link or frames could be dropped.

B. Untagged frames will be placed in the configured native VLAN of a port.

C. Private VLAN configurations are not supported.

D. It is a proprietary protocol that is supported on Cisco switches only.

25.

Refer to the exhibit. All switches are configured with the default port priority value. Which two commands ensure that traffic from PC1 is forwarded over Gi1/3 trunk port between DWS1 and DSW2? (Choose two)

A. DSW2(config-if)#spanning-tree port-priority 128

B. DSW2(config-if)#spanning-tree port-priority 16

C. DSW2(config-if)#interface gi1/3

D. DSW1(config-if)#interface gi1/3

E. DWS1(config-if)#spanning-tree port-priority 0

26.

. Which statement describes the term root bridge in the operation of STP?

A. It is a switch that is at the top of the spanning tree and whose ports are all forwarding and are all categorized as designated ports.

B. It is a value that decides which switch can become the root bridge.

C. It is a feature that prevents any alternative or root ports from becoming designated ports because of a loss of BPDUs on the root port.

D. It is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU.

None

27.

Refer to the exhibit. How was spanning-tree configured on this interface?

A. By entering the command spanning-tree portfast trunk in the interface configuration mode.

B. By entering the command spanning-tree portfast in the interface configuration mode.

C. By entering the command spanning-tree mst1 vlan 10,20,30,40 in the global configuration mode.

D. By entering the command spanning-tree vlan 10,20,30,40 root primary in the interface configuration mode.

None

28.

What are the two options that describe the effects of the spanning-tree portfast command? (Choose two.)

A. Portfast bypasses the learning state and moves immediately into blocking.

B. If a switch port is configured with PortFast, it is an access port that immediately transitions from a blocking to forwarding state.

C. Portfast enables the port to bypass the listening and learning states of STP.

D. Enabling PortFast on trunks that connect to other switches improves convergence.

E. If the switch port is configured with PortFast, it waits 15 seconds before transitioning from a blocking to forwarding state.

29.

Which three components are combined to form a bridge ID?

A. MAC address

B. Cost

C. Bridge priority

D. IP address

E. Port ID

F. Extended system ID

30.

What are two misconfigurations within an MST region that might introduce port blocking unintentionally? (Choose two.)

A. trunk link pruning

B. too many VLANs assigned to an instance

C. VLAN assignment to the IST

D. misconfigured revision number across the MST region

E. misconfigured region name across the MST region

31.

Which two statements are true about the 802.1Q trunking protocol? (Choose two.)

A. The native VLAN interface configurations must match at both ends of the link or frames could be dropped.

B. Untagged frames will be placed in the configured native VLAN of a port.

C. Private VLAN configurations are not supported.

D. It is a proprietary protocol that is supported on Cisco switches only.

32.

Which two DTP mode combinations will form a trunk link between two switches? (Choose two.)

A. access and dynamic auto

B. dynamic auto and dynamic auto

C. trunk and access

D. trunk and dynamic desirable

E. dynamic auto and dynamic desirable

33.

Assuming that all switches in a network have the default bridge priority for each MST instance, what effect does the command spanning-tree mst 10 root seconday have when entered on a single switch?

A. Sets the bridge priority on the switch to 28672 for MST instance 10

B. Sets the bridge priority on the switch to 24586 for MST instance 10

C. Sets the bridge priority on the switch to 24582 for MST instance 10

D. Sets the bridge priority on the switch to 24576 for MST instance 10

None

34.

What is the primary effect of the spanning-tree portfast command?

A. It enables BPDU messages

B. It minimizes spanning-tree convergence time

C. It immediately puts the port into the forwarding state when the switch is reloaded

D. It immediately enables the port in the listening state

None

35.

Which PAgP mode combination prevents an Etherchannel from forming?

A. auto/auto

B. desirable/desirable

C. auto/desirable

D. desirable

None

36.

Which LACP technology is used for designating whuch member interfaces will be active in a port-channel configuration where there are more member interfaces than the maximum allowed?

A. LACP min-links

B. LACP port priority

C. LACP system priority

D. LACP fast

None

37.

Refer to the exhibit. What does the output confirm about the switch's spanning tree configuration?

A. The spanning-tree mode stp ieee command was entered on this switch

B. The spanning-tree operation mode for this switch is PVST.

C. The spanning-tree operation mode for this switch is PVST+.

D. The spanning-tree operation mode for this switch is IEEE

None

38.

Which Cisco proprietary protocol is used for dynamically forming a trunk connection between two switches?

A. VTP

B. STP

C. DTP

D. PAgP

None

39.

After the election of the root bridge has been completed, how will switches find the best paths to the root bridge?

A. Each switch will analyze the sum of the hops to reach the root and use the path with the fewest hops.

B. Each switch will analyze the port states of all neighbors and use the designated ports to forward traffic to the root.

C. Each switch will analyze the BID of all neighbors to reach the root and use the path through the lowest BID neighbors.

D. Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost.

None

40.

Which of the following are valid Port Aggregation Protocol (PAgP) modes? (Choose two.)

A. On

B. Active

C. Passive

D. Auto

E. Desirable

41.

Refer to the exhibit. A network engineer troubleshoots an issue with the port channel between SW1 and SW2. which command resolves the issue?

A. SW2(config-if)#switchport mode trunk

B. SW1(config-if)#channel-group 10 mode active

C. SW1(config-if)#channel-group 10 mode desirable

D. SW2(config-if)#channel-group 10 mode on

None

42.

Refer to the exhibit. An engineer attempts to configure a trunk between switch SW1 and switch SW2 using DTP, but the trunk does not form. Which command should the engineer apply to switch SW2 to resolve this issue?

A. switchport mode dynamic desirable

B. switchport mode access

C. no switchport

D. switchport nonegotiate

None

43.

Which statement describes the term root port in the operation of STP?

A. It indicates that the port has transitioned from a blocking state and can send or receive BPDUs, but cannot forward any other network traffic.

B. It is a port state that can forward all network traffic and can update the MAC address table.

C. It is a port state that can modify the MAC address table with any network traffic that it receives, but only forwards BPDUs and not any other network traffic.

D. It is a port that connects to the root bridge or an upstream switch in the spanning-tree topology.

None

44.

Refer to the exhibit. An engineer entered the no spanning-tree bpduguard enable on interface fa1/0/7 command. Which statement describes the effect of this command?

A. Fa1/0/7 remains in err-disabled state until the shutdown/no shutdown command is entered in the interface configuration mode.

B. Interface Fa1/0/7 remains in err-disabled state until the errdisable recovery cause bpduguard command is entered in the interface configuration mode.

C. Fa1/0/7 remains in err-disabled state until the errdisable recovery bpduguard command is entered in the interface configuration mode.

D. Interface Fa1/0/7 remains in err-disabled state until the spanning-tree portfast bpduguard disable command is entered in the interface configuration mode.

E. Interface Fa1/0/7 returns to an up and operational state.

None

45.

Which two statements are true about routed ports on a multilayer switch? (Choose two.)

A. To create a routed port requires removal of Layer 2 port functionality with the no switchport interface configuration command.

B. A routed port is a physical switch port with Layer 2 capability.

C. A routed port is not associated with a particular VLAN.

D. A routed port behaves like a regular router interface and supports VLAN subinterfaces.

E. The interface vlan global configuration command is used to create a routed port.

46.

How does an MST region send VLAN information through the PVST simulation mechanism to a switch that runs PVST+?

A. It sends out PVST+ BPDUs, one for each VLAN, using the information from the IST.

B. It sends out one PVST+ BPDU with the information from the IST.

C. It sends out one PVST+ BPDU that maps all VLANs into VLAN1.

D. It sends out multiple PVST+ BPDUs, one for each VLAN, plus the IST.

None

47.

Which STP priority configuration would ensure that a switch would always be the root switch?

A. spanning-tree vlan 10 priority 0

B. spanning-tree vlan 10 priority 61440

C. spanning-tree vlan 10 priority 4096

D. spanning-tree vlan 10 root primary

None

48.

What are two configuration parameters that must match for all switches in the same MST region? (Choose two.)

A. bridge priority

B. region name

C. version number

D. trunk link encapsulation method

E. port status

49.

Refer to the exhibit. The trunk between Gig1/0/1 of switch SW2 and Gig1/0/1 of switch SW1 is not operational. Which action resolves this issue?

A. Configure both interfaces in dynamic auto DTP mode and ensure that the switches are in the same VTP domain.

B. Configure both interfaces in dynamic desirable DTP mode and ensure that the switches are in the same VTP domain

C. Configure both interfaces in nonegotiate and ensure that the switches are in the different VTP domain.

D. Configure both interfaces in dynamic auto DTP mode and ensure that the switches are in the different VTP domain.

None

Comment

50.

Refer to the exhibit. An engineer must set up connectivity between a campus aggregation layer and a branch office access layer. The engineer uses dynamic trunking protocol to establish this connection, however, management traffic on VLAN1 is not passing. Which action resolves the issue and allow communication for all configured VLANs?

A. Allow all VLANs on the trunk links

B. Disable Spanning Tree for the native VLAN.

C. Configure the correct native VLAN on the remote interface

D. Change both interfaces to access ports.

None

51.

Refer to the exhibit. A port channel is configured between SW2 and SW3. SW2 is not running a Cisco operating system. When all physical connections are made, the port channel does not establish. Based on the configuration except of SW3, what is the cause of the problem?

A. The port channel on SW2 is using an incompatible protocol.

B. The port-channel trunk is not allowing the native VLAN.

C. The port-channel should be set to auto.

D. The port-channel interface lead balance should be set to src-mac

None

52.

Refer to the exhibit. Link1 is a copper connection and Link2 is a fiber connection. The fiber port must be the primary port for all forwarding. The output of the show spanning-tree command on SW2 shows that the fiber port is blocked by spanning tree. An engineer enters the spanning-tree port-priority 32 command on G0/1 on SW2, but the port remains blocked. Which command should be entered on the ports that are connected to Link2 to resolve the issue?

A. Enter spanning-tree port-priority 32 on SW1.

B. Enter spanning-tree port-priority 224 on SW1.

C. Enter spanning-tree port-priority 4 on SW2.

D. Enter spanning-tree port-priority 64 on SW2.

None

53.

What type of specialized memory is used to facilitate high performance switching in Cisco multilayer switches?

A. Address Resolution Protocol (ARP) memory

B. Ternary Content Addressable Memory (TCAM)

C. Cisco Express Forwarding (CEF) memory

D. Content-Addressable Memory (CAM)

None

54.

Refer to the exhibit. An engineer implemented several configuration changes and receives the logging message on switch1. Which action should the engineer take to resolve this issue?

A. Change the VTP domain to match on both switches

B. Change Switch2 to switch port mode dynamic auto

C. Change Switch1 to switch port mode dynamic auto

D. Change Switch1 to switch port mode dynamic desirable

None

55.

What is the goal of Layer 3 switching?

A. To process packets at Layer 2 switching speeds while utilizing the scalability of routing

B. To provide a better path to the Internet without using routing protocols

C. To implement the routing process by using routed protocols

D. to integrate all of the networking functions into one device

None

56.

Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)

A. Link-state dynamic routing that provides redundant routes

B. Removing single points of failure with multiple Layer 2 switches

C. Implementing VLANs to contain broadcasts

D. Static default routes

E. redundant links between Layer 2 switches

57.

Refer to the exhibit. Which action resolves the EtherChannel issue between SW2 and SW3?

A. Configure switchport mode trunk on SW2.

B. Configure switchport nonegotiate on SW3

C. Configure channel-group 1 mode desirable on both interfaces.

D. Configure channel-group 1 mode active on both interfaces.

None

58.

Refer to exhibit. VLANs 50 and 60 exist on the trunk links between all switches All access ports on SW3 are configured for VLAN 50 and SW1 is the VTP server. Which command ensures that SW3 receives frames only from VLAN 50?

A. SW1 (config)#vtp pruning

B. SW3(config)#vtp mode transparent

C. SW2(config)=vtp pruning

D. SW1 (config >tp mode transparent

None

59.

Which statement describes the term bridge priority in the operation of STP?

A. It is a value that decides which switch can become the root bridge.

B. It is a value that is used, in the event of a loop, to decide which port on the switch must be put into forwarding state.

C. It is a feature that allows access ports to bypass the earlier learning and listening states and forward traffic immediately.

D. It is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU.

None

60.

A network administrator enters the spanning-tree portfast bpduguard default command. What is the result of this command being issued on a Cisco switch?

A. Any switch port that receives a BPDU will ignore the BPDU message.

B. Any switch port will be error-disabled if it receives a BPDU.

C. Any trunk ports will be allowed to connect to the network immediately, rather than waiting to converge.

D. Any switch port that has been configured with PortFast will be error-disabled if it receives a BPDU.

None

61.

Which statement describes the term blocking in the operation of STP?

A. It is a port state that can modify the MAC address table with any network traffic that it receives, but only forwards BPDUs and not any other network traffic.

B. It indicates that the port is in an administratively off position.

C. It is a port state that is enabled but does not forward any traffic to ensure that a loop does not occur.

D. It indicates that the port has transitioned from a blocking state and can send or receive BPDUs, but cannot forward any other network traffic.

None

62.

Which statement describes the term root guard in the operation of STP?

A. It is a feature that prevents any alternative or root ports from becoming designated ports because of a loss of BPDUs on the root port.

B. It is a feature that prevents a configured port from becoming a root port.

C. It is a value that decides which switch can become the root bridge.

D. It is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU.

None

63.

Which LACP technology is used for designating which member interfaces will be active in a port-channel configuration where there are more member interfaces than the maximum allowed?

A. LACP min-links

B. LACP system priority

C. LACP port priority

D. LACP fast

None

64.

Refer to the exhibit. How to make DSW1 the primary root for VLAN 10? (Choose two)

A. DWS1(config-if)#spanning-tree port-priority 0

B. DSW2(config-if)#spanning-tree port-priority 16

C. DSW1(config-if)#interface gi1/3

D. DSW2(config-if)#interface gi1/3

E. DSW2(config-if)#spanning-tree port-priority 128

65.

Given the following configuration, which two statements are true? (Choose two.)

switch(vlan)# vtp version 2
switch(vlan)# vtp mode server
switch(vlan)# vtp domain Cisco
switch(vlan)# vtp password mypassword

A. This switch can advertise its VLAN configuration to other switches in the Cisco domain only, but can receive advertisements from other domains.

B. The password will prevent unauthorized routers from participating in the Cisco domain.

C. This switch can send and receive advertisements from only the Cisco domain.

D. This switch can create, modify, and delete all VLANs within the Cisco domain.

E. This switch maintains a full list of all VLANs and can create VLANs, but cannot delete or modify existing VLANs.

66.

Which technology is used to protect the switched infrastructure from problems caused by receiving BPDUs on ports that should not be receiving them?

A. Loop guard

B. PortFast

C. BPDU guard

D. RSPAN

E. Root guard

None

67.

The network administrator wants to configure a switch to pass VLAN update information to other switches in the domain but not update its own local VLAN database. Which two steps should the administrator perform to achieve this? (Choose two.)

A. Configure VTP version 1 on the switch.

B. Configure the switch with the same VTP domain name as other switches in the network.

C. Verify that the switch has a higher configuration revision number.

D. Reset the VTP counters.

E. Configure the VTP mode of the switch to transparent.

68.

What would be the preferred way to implement a loopless switch network where there are 1500 defined VLANs and it is necessary to load the shared traffic through two main aggregation points based on the VLAN identifier?

A. 802.1D

B. 802.1s

C. 802.1W

D. 802.1AE

None

69.

Refer to the exhibit. SwitchC connects HR and Sales to the Core switch. However, business needs require that no traffic from the Finance VLAN traverse this switch. Which command meets this requirement?

A. SwitchC(config)#vtp pruning vlan 110
B. SwitchC(config)#vtp pruning
C. SwitchC(config)#interface port-channel 1
SwitchC(config-if)#switchport trunk allowed vlan add 210,310
D. SwitchC(config)#interface port-channel 1
SwitchC(config-if)#switchport trunk allowed vlan remove 110

A. Option A

B. Option B

C. Option C

D. Option D

None

70.

In what situation would a network administrator most likely implement root guard?

A. on all switch ports that connect to a Layer 3 device

B. on all switch ports that connect to another switch

C. on all switch ports that connect to host devices

D. on all switch ports (used or unused)

E. on all switch ports that connect to another switch that is not the root bridge

None

71.

Refer to the exhibit. What is the result when a switch that is running PVST+ is added to this network?

A. DSW2 operates in Rapid PVST+ and the new switch operates in PVST+

B. Both switches operate in the PVST+ mode

C. Spanning tree is disabled automatically on the network

D. Both switches operate in the Rapid PVST+ mode.

None

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