CCNA 3 Chapter 2 v6 Exam Answers

Which command should the network administrator implement to prevent the transfer of DTP frames between a Cisco switch and a non-Cisco switch?

To prevent DTP frames from being generated by the interface of a Cisco switch, use the S1(config-if)# switchport nonegotiate command. DTP is Cisco proprietary and not usable by other vendors.

How are IP addressing designs affected by VLAN implementations?

Each VLAN requires its own network number, broadcast address, and valid IP addresses because each VLAN is a separate network. IP addressing schemes are frequently designed with the VLAN numbers as part of the design.

What is a characteristic of a routed port on a Layer 3 switch?

A routed port on a Layer 3 switch is commonly used for connecting between distribution and core layer switches or between a Layer 3 switch and a router. This port does not get VLAN or trunking commands assigned to it. Instead, the port is programmed with an IP address. This is commonly used when static routing is configured on the switch or when a routing protocol is being run between the Layer 3 switch and the router or another Layer 3 switch.

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?

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.

Which two VTP parameters must be identical on all switches in the network in order to participate in the same VTP domain? (Choose two.)

VTP updates are sent to other switches in the same domain with the same password. The configuration revision number is used to determine whether a switch keeps its existing VLAN database or updates it with the new information.

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?

The IP and belong to the same subnet of Valid host IPv4 addresses include to

A switch is participating in a VTP domain and configured as a VTP server. The switch needs to propagate VLAN 10 (used by the Manufacturing department) throughout the VTP domain, but does not have any directly connected hosts using that particular VLAN. Which configuration would satisfy this requirement?
interface fa0/24
switchport mode access
switchport access vlan 10

The best practice to add a VLAN to the VLAN database with no local hosts to be in that VLAN is to configure that VLAN (vlan 10) with its name (name Manufacturing) and use the exit command to complete the configuration. Do not assign any switch interfaces to that VLAN.

Under which two occasions should an administrator disable DTP while managing a local area network? (Choose two.)

Cisco best practice recommends disabling DTP on links where trunking is not intended and when a Cisco switch is connected to a non-Cisco switch. DTP is required for dynamic trunk negotiation.

Which two events will cause the VTP revision number on a VTP server to change? (Choose two.)

Changing the VTP domain name always resets the VTP revision number to 0. This is an important step in adding switches to an existing VTP domain no matter what VTP mode the switch uses.

Refer to the exhibit. A network administrator is configuring inter-VLAN routing. However, the communication between VLAN 10 and VLAN 20 fails. Based on the output of the show vlan command, what is the cause of the problem?

Because two physical interfaces on the router are connected to two physical ports on a switch, this is a legacy inter-VLAN configuration. With legacy inter-VLAN, the ports on the switch that are connected to the router need to be in access mode and assigned their respective VLANs. As shown in the display, these two ports are still in VLAN 1. The IP address on the router interface can be configured as needed, as long as the devices on the same VLAN are in the same network.


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? (Note that typing no shutdown will not fix this problem.) [ _ ]

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 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 “”. A message “Congratulations! You’ve got it!​” will be displayed.​

Match the DTP mode with its function. (Not all options are used.)

The dynamic auto mode makes the interface become a trunk interface if the neighboring interface is set to trunk or desirable mode. The dynamic desirable mode makes the interface actively attempt to convert the link to a trunk link. The trunk mode puts the interface into permanent trunking mode and negotiates to convert the neighboring link into a trunk link. The nonegotiate mode prevents the interface from generating DTP frames.

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?

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.

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 /24 network are having trouble connecting to PCs on VLAN 30 in the /24 network. Which error is most likely causing this problem?

The 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.

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

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.

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?

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.

What happens to switch ports after the VLAN to which they are assigned is deleted?

The affected ports must be reconfigured for an active VLAN.

Fill in the blank. In a Cisco switch, the extended range VLAN information is stored in the [ _ ] file.

Extended range VLAN information is stored in the running configuration, unlike normal range VLANs which are stored in the vlan.dat file in flash. Extended range VLANs have other differences from normal range VLANs as well.​

What is a characteristic of VTP?

All switches in the same VTP domain forward advertisements to other switches.

Which command displays the encapsulation type, the voice VLAN ID, and the access mode VLAN for the Fa0/1 interface?

The show interfaces switchport command displays the following information for a given port:
Administrative Mode
Operational Mode
Administrative Trunking Encapsulation
Operational Trunking Encapsulation
Negotiation of Trunking
Access Mode VLAN
Trunking Native Mode VLAN
Administrative Native VLAN tagging
Voice VLAN


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

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

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.

Which three actions can cause problems with a VTP implementation? (Choose three.)

Besides domain name, other issues to check are VTP versions, VTP password, and revision number before inserting a switch into any network where VTP is active.

Where is the vlan.dat file stored on a switch?

Normal range VLAN configurations are stored within a VLAN database file, called vlan.dat, which is located in the flash memory of the switch.

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 switch in VTP server mode can create, modify, and delete VLANs as well as transmit that information (if the switch has the highest VTP configuration revision number) to other switches in the same VTP domain.

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