22
1 Refer to the exhibit. The switch does the routing for the hosts that connect to VLAN 5. If the PC accesses a web server from the Internet, at what point will a VLAN number be added to the frame? point A point B point C point D point E No VLAN number is added to the frame in this design. The switch has an SVI configured in VLAN 5 and is routing for VLAN 5. With this design no trunking is necessary. The switch port to which the PC attaches is in VLAN 5, so no trunking is needed there. The connection between the switch and the router is a routed port on the switch, so an IP address can be assigned and no trunking is needed. The connection from the router to the Internet is a serial WAN connection that requires no trunking. Observable Description

EX5

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Page 1: EX5

1

Refer to the exhibit. The switch does the routing for the hosts that connect to VLAN 5. If the PC accesses a web server from the Internet, at what point will a VLAN number be added to the frame?

point A

point B

point C

point D

point E

No VLAN number is added to the frame in this design.

The switch has an SVI configured in VLAN 5 and is routing for VLAN 5. With this design no trunking is necessary. The switch port to which the PC attaches is in VLAN 5, so no trunking is needed there. The connection between the switch and the router is a routed port on the switch, so an IP address can be assigned and no trunking is needed. The connection from the router to the Internet is a serial WAN connection that requires no trunking.

Observable

Description

Max Value

correctness of response 2 points for Option 6

0 points for any other option 2

Page 2: EX5

2

Which type of inter-VLAN communication design requires the configuration of multiple subinterfaces?

router on a stick

routing via a multilayer switch

routing for the management VLAN

legacy inter-VLAN routing

The router-on-a-stick design always includes subinterfaces on a router. When a multilayer switch is used, multiple SVIs are created. When the number of VLANs equals the number of ports on a router, or when the management VLAN needs to be routed, any of the inter-VLAN design methods can be used.

Observable

Description

Max Value

correctness of response 2 points for Option 1

0 points for any other option 2

3

What is a disadvantage of using router-on-a-stick inter-VLAN routing?

does not support VLAN-tagged packets

requires the use of more physical interfaces than legacy inter-VLAN routing

does not scale well beyond 50 VLANs

requires the use of multiple router interfaces configured to operate as access links

Router-on-a-stick inter-VLAN routing does not scale beyond 50 VLANs. The router can receive VLAN-tagged packets and send VLAN-tagged packets to a destination. Router-on-a-stick inter-VLAN routing can utilize a single router interface as a trunk link to receive and forward VLAN traffic and does not require multiple interfaces.

Observable

Description

Page 3: EX5

Max Value

correctness of response 2 points for Option 3

0 points for any other option 2

4

How is traffic routed between multiple VLANs on a multilayer switch?

Traffic is routed via physical interfaces.

Traffic is routed via internal VLAN interfaces.

Traffic is broadcast out all physical interfaces.

Traffic is routed via subinterfaces.

Multilayer switches can perform inter-VLAN routing by the use of internal VLAN interfaces. External physical interfaces can receive traffic but are not necessary for routing functions. When routing between VLANs, any broadcast traffic that is received on a VLAN would remain on ports that are members of that VLAN. Subinterfaces are not usable for inter-VLAN routing on multilayer switches.

Observable

Description

Max Value

correctness of response 2 points for Option 2

0 points for any other option 2

5

A small college uses VLAN 10 for the classroom network and VLAN 20 for the office network. What is needed to enable communication between these two VLANs while using legacy inter-VLAN routing?

A router with at least two LAN interfaces should be used.

Two groups of switches are needed, each with ports that are configured for one VLAN.

A router with one VLAN interface is needed to connect to the SVI on a switch.

A switch with a port that is configured as trunk is needed to connect to a router.

With legacy inter-VLAN routing, different physical router interfaces are connected to different physical switch ports. The switch ports that connect to the router are in access mode, each belonging to a different VLAN. Switches can have ports that are assigned to different VLANs, but communication between VLANs requires routing function from the router.

Page 4: EX5

Observable

Description

Max Value

correctness of response 2 points for Option 1

0 points for any other option 2

6

Which statement describes a disadvantage of using router subinterfaces for inter-VLAN routing?

It is more expensive than using individual router interfaces.

Routed traffic must contend for bandwidth on a single router interface.

Trunking cannot be used to connect the router to the switch.

All untagged traffic is dropped.

In inter-VLAN routing with router-on-a-stick, multiple subinterfaces are configured under one physical interface, therefore, traffic of all VLANs routed through this physical interface with contention for the bandwidth.

Observable

Description

Max Value

correctness of response 2 points for Option 2

0 points for any other option 2

Page 5: EX5

7

Refer to the exhibit. A network administrator needs to configure router-on-a-stick for the networks that are shown. How many subinterfaces will have to be created on the router if each VLAN that is shown is to be routed and each VLAN has its own subinterface?

1

2

3

4

5

Based on the IP addresses and masks given, the PC, printer, IP phone, and switch management VLAN are all on different VLANs. This situation will require four subinterfaces on the router.

Observable

Description

Max Value

correctness of response 2 points for Option 4

0 points for any other option 2

Page 6: EX5

8

Refer to the exhibit. A network administrator has configured router CiscoVille with the above commands to provide inter-VLAN routing. What command will be required on a switch that is connected to the Gi0/0 interface on router CiscoVille to allow inter-VLAN routing?

switchport mode access

no switchport

switchport mode trunk

switchport mode dynamic desirable

When they are configured for inter-VLAN routing, routers do not support the dynamic trunking protocol that is used by switches. For router-on-a-stick configurations to function, a connected switch must use the command switchport mode trunk.

Observable

Description

Max Value

correctness of response 2 points for Option 3

0 points for any other option 2

Page 7: EX5

9

Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.35 and a destination address of 192.168.1.85. What will the router do with this packet?

The router will drop the packet.

The router will forward the packet out interface FastEthernet 0/1.1.

The router will forward the packet out interface FastEthernet 0/1.2.

The router will forward the packet out interface FastEthernet 0/1.3.

The router will forward the packet out interface FastEthernet 0/1.2 and interface FastEthernet 0/1.3.

The IP address 192.168.1.85 belongs to network 192.168.1.64/27. The valid host addresses in this network include 192.168.1.65 to 192.168.1.94. The IP address configured for the subinterface of Fa0/1.2 is in the same network, which serves as the default gateway for the VLAN 2.

Observable

Description

Max Value

correctness of response 2 points for Option 3

0 points for any other option 2

Page 8: EX5

10

Refer to the exhibit. Communication between the VLANs is not occurring. What could be the issue?

The wrong port on the router has been used.

The Gi1/1 switch port is not in trunking mode.

A duplex issue exists between the switch and the router.

Default gateways have not been configured for each VLAN.

The subinterfaces could not have an IP address unless the encapsulation mode had been configured. When a duplex issue exists, communication can still occur, but it is at a slower than optimum rate.

Observable

Description

Max Value

correctness of response 2 points for Option 2

0 points for any other option 2

11

Inter-VLAN communication is not occurring in a particular building of a school. Which two commands could the network administrator use to verify that inter-VLAN communication was working properly between a router and a Layer 2 switch when the router-on-a-stick design method is implemented? (Choose two.)

From the router, issue the show ip route command.

From the router, issue the show interfaces trunk command.

Page 9: EX5

From the router, issue the show interfaces interface command.

From the switch, issue the show vlans command.

From the switch, issue the show interfaces trunk command.

From the switch, issue the show interfaces interface command.

In order for inter-VLAN communication to occur between a Layer 2 switch and a router, trunking must be enabled on the port that connects the switch to the router, and the router must have active subinterfaces for each VLAN on the switch. Other commands that are helpful in this situation are the show ip interface brief command on the router and the show interfaces interface switchport command on the switch. The show interfaces trunk command would not be performed on a router. The show interfaces interface command would show information for only one router interface, not all of them as provided by the show ip route command. The show interfaces interface and show vlans commands on a switch do not provide trunk verification.

Observable

Description

Max Value

correctness of response Option 1 and Option 5 are correct.

1 point for each correct option.

0 points if more options are selected than required. 2

Page 10: EX5

12

Refer to the exhibit. A network administrator is verifying the configuration of inter-VLAN routing. Users complain that PCs on different VLANs cannot communicate. Based on the output, what are two configuration errors on switch interface Gi1/1? (Choose two.)

Gi1/1 is in the default VLAN.

Voice VLAN is not assigned to Gi1/1.

Gi1/1 is configured as trunk mode.

Negotiation of trunking is turned on on Gi1/1.

The trunking encapsulation protocol is configured wrong.

With legacy inter-VLAN routing methods, the switch ports that connect to the router should be configured as access mode and be assigned appropriate VLANs. In this scenario, the Gi1/1 interface should be in access mode with VLAN 10 assigned. The other options are default settings on the switch and have no effect on legacy inter-VLAN routing.

Observable

Description

Max Value

correctness of response Option 1 and Option 3 are correct.

1 point for each correct option.

0 points if more options are selected than required. 2

Page 11: EX5

13

Refer to the exhibit. A network administrator is verifying the configuration of inter-VLAN routing. Users complain that PC2 cannot communicate with PC1. Based on the output, what is the possible cause of the problem?

Gi0/0 is not configured as a trunk port.

The command interface GigabitEthernet0/0.5 was entered incorrectly.

There is no IP address configured on the interface Gi0/0.

The no shutdown command is not entered on subinterfaces.

The encapsulation dot1Q 5 command contains the wrong VLAN.

In router-on-a-stick, the subinterface configuration should match the VLAN number in the encapsulation command, in this case, the command encapsulation dot1Q 10 should be used for VLAN 10. Since subinterfaces are used, there is no need to configure IP on the physical interface Gi0/0. The trunk mode is configured on the switch port that connects to the router. The subinterfaces are turned on when they are added.

Observable

Description

Max Value

correctness of response 2 points for Option 5

0 points for any other option 2

Page 12: EX5

14

Refer to the exhibit. After attempting to enter the configuration that is shown in router RTA, an administrator receives an error and users on VLAN 20 report that they are unable to reach users on VLAN 30. What is causing the problem?

Dot1q does not support subinterfaces.

There is no address on Fa0/0 to use as a default gateway.

RTA is using the same subnet for VLAN 20 and VLAN 30.

The no shutdown command should have been issued on Fa0/0.20 and Fa0/0.30.

The IP 192.168.2.49/27 and 192.168.3.62/27 belong to the same subnet of 192.168.3.32/27. Valid host IPv4 addresses include 192.168.3.33 to 192.168.3.62.

Observable

Description

Max Value

correctness of response 2 points for Option 3

0 points for any other option 2

Page 13: EX5

15

Refer to the exhibit. A router-on-a-stick configuration was implemented for VLANs 15, 30, and 45, according to the show running-config command output. PCs on VLAN 45 that are using the 172.16.45.0 /24 network are having trouble connecting to PCs on VLAN 30 in the 172.16.30.0 /24 network. Which error is most likely causing this problem?

The wrong VLAN has been configured on GigabitEthernet 0/0.45.

The command no shutdown is missing on GigabitEthernet 0/0.30.

The GigabitEthernet 0/0 interface is missing an IP address.

There is an incorrect IP address configured on GigabitEthernet 0/0.30.

he subinterface GigabitEthernet 0/0.30 has an IP address that does not correspond to the VLAN addressing scheme. The physical interface GigabitEthernet 0/0 does not need an IP address for the subinterfaces to function. Subinterfaces do not require the no shutdown command.

Observable

Description

Max Value

correctness of response 2 points for Option 4

0 points for any other option 2

Page 14: EX5

16

Refer to the exhibit. A network administrator is configuring RT1 for inter-VLAN routing. The switch is configured correctly and is functional. Host1, Host2, and Host3 cannot communicate with each other. Based on the router configuration, what is causing the problem?

Interface Fa0/0 is missing IP address configuration information.

IP addresses on the subinterfaces are incorrectly matched to the VLANs.

Each subinterface of Fa0/0 needs separate no shutdown commands.

Routers do not support 802.1Q encapsulation on subinterfaces.

Since Host 1 (in VLAN 20) has the IP 172.18.1.10/27, the subinterface Fa0/0.1 should be configured with an IP address in the network 172.168.1.0/27. Similarly, Fa0/0.2 should be with an IP address in the network 172.168.1.64/27 and Fa0/0.3 should be with an IP address in the network 172.168.1.96/27.

Observable

Description

Max Value

correctness of response 2 points for Option 2

0 points for any other option 2

Page 15: EX5

17

What condition is required to enable Layer 3 switching?

The Layer 3 switch must have IP routing enabled.

All participating switches must have unique VLAN numbers.

All routed subnets must be on the same VLAN.

Inter-VLAN portions of Layer 3 switching must use router-on-a-stick.

Observable

Description

Max Value

correctness of response 2 points for Option 1

0 points for any other option 2

18

Refer to the exhibit. Which command can the administrator issue to change the VLAN10 status to up?

Switch1(config)# interface vlan 10

Switch1(config-if)# no shutdown

Page 16: EX5

Switch1(config)# interface vlan 10

Switch1(config-if)# ip address 192.168.10.1 255.255.255.0

Switch1(config)# interface vlan 10

Switch1(config-if)# ip address 192.168.10.1 255.255.255.0

Switch1(config-if)# no shutdown

Switch1(config)# vlan 10

All SVIs must be assigned to an existing VLAN. As VLAN10 is down and VLAN20 is up, probably there is no VLAN10 created in Switch1. The vlan 10 command will create the VLAN 10.

Observable

Description

Max Value

correctness of response 2 points for Option 4

0 points for any other option 2

19

While configuring inter-VLAN routing on a multilayer switch, a network administrator issues the no switchport command on an interface that is connected to another switch. What is the purpose of this command?

to create a routed port for a single network

to provide a static trunk link

to create a switched virtual interface

to provide an access link that tags VLAN traffic

When a Layer 2 interface on a multilayer switch is configured with the no switchport command, it becomes a routed port. A routed port is configured with an IP address for a specific subnet.

Observable

Page 17: EX5

Description

Max Value

correctness of response 2 points for Option 1

0 points for any other option 2

20

What is a disadvantage of using multilayer switches for inter-VLAN routing?

Multilayer switches have higher latency for Layer 3 routing.

Multilayer switches are more expensive than router-on-a-stick implementations.

Spanning tree must be disabled in order to implement routing on a multilayer switch.

Multilayer switches are limited to using trunk links for Layer 3 routing.

The main disadvantage of the multilayer switches is their higher cost. Because both routing and switching are done in hardware, multilayer switches are faster than router-on-a-stick.

Observable

Description

Max Value

correctness of response 2 points for Option 2

0 points for any other option 2

21

Fill in the blank with an acronym.

While configuring inter-VLAN routing on a multilayer switch, a/an _________________is used as a virtual-routed VLAN interface.

Page 18: EX5

An SVI or switch virtual interface is used to provide inter-VLAN routing on a multilayer switch.

Observable

Description

Max Value

correctness of response Observable 1 receives +1 point if it was answered correctly.

Observable 1 receives +0 points if it was answered incorrectly. 1

22

Fill in the blank. Do not use abbreviations.

A network engineer is troubleshooting the configuration of new VLANs on a network. Which command is used to display the list of VLANs that exists on the switch?______________________________

Observable

Description

Max Value

correctness of response Observable 1 receives +1 point if it was answered correctly.

Observable 1 receives +0 points if it was answered incorrectly. 1

23

The PT initialization was skipped. You will not be able to view the PT activity.

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

Fill in the blank. Do not use abbreviations.

Which command is missing on the Layer 3 switch to restore the full connectivity between PC1 and the web server?______________________________________

On the Layer 3 switch, an SVI has to be explicitly created for each VLAN. PC1 belongs to VLAN 10, which is already created on the Layer 3 switch and with an IP address assigned. The web server belongs to VLAN 20. The interface vlan 20 command was already entered on the Layer 3 switch, but with no IP address assigned to it. So the ip address 192.168.20.1 255.255.255.0 command has to be entered in the interface vlan 20 interface mode. To test the connectivity between the PC1 and the web server, access PC1, select the Desktop tab, click on the Web Browser application and enter on the URL box "www.webserver.com". A message "Congratulations! You've got it!" will be displayed.

Page 19: EX5

Observable

Description

Max Value

correctness of response Observable 1 receives +1 point if it was answered correctly.

Observable 1 receives +0 points if it was answered incorrectly. 1