viernes, 24 de julio de 2015

CCNA 2 Cisco v5.0 Chapter 3 - Answers

1. Which three statements accurately describe VLAN types? (Choose three).

After the initial boot of an unconfigured switch, all ports are members of the default VLAN.
A management VLAN is any VLAN that is configured to access management features of the switch.
An 802.1Q trunk port, with a native VLAN assigned, supports both tagged and untagged traffic.
A data VLAN is used to carry VLAN management data and user-generated traffic.
Voice VLANs are used to support user phone and e-mail traffic on a network.
VLAN 1 is always used as the management VLAN.

2. What happens to a port that is associated with VLAN 10 when the administrator deletes VLAN 10 from the switch?

The port becomes inactive.
The port automatically associates itself with the native VLAN.
The port creates the VLAN again.
The port goes back to the default VLAN.


Refer to the exhibit. DLS1 is connected to another switch, DLS2, via a trunk link. A host that is connected to DLS1 is not able to communicate to a host that is connected to DLS2, even though they are both in VLAN 99. Which command should be added to Fa0/1 on DLS1 to correct the problem?

switchport trunk native vlan 66
switchport trunk allowed vlan add 99
switchport mode dynamic auto
switchport nonegotiate

4. A network administrator is determining the best placement of VLAN trunk links. Which two types of point-to-point connections utilize VLAN trunking? (Choose two.)

between two switches that utilize multiple VLANs
between a switch and a server that has an 802.1Q NIC
between two switches that share a common VLAN
between a switch and a client PC
between a switch and a network printer

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

S1(config-if)#switchport nonegotiate
S1(config-if)# switchport mode trunk
S1(config-if)# switchport mode access
S1(config-if)# switchport mode dynamic desirable
S1(config-if)# switchport trunk allowed vlan none


Refer to the exhibit. PC-A and PC-B are both in VLAN 60. PC-A is unable to communicate with PC-B. What is the problem?

The VLAN that is used by PC-A is not in the list of allowed VLANs on the trunk.
The native VLAN is being pruned from the link.
The trunk has been configured with the switchport nonegotiate command.
The native VLAN should be VLAN 60.

7. What must the network administrator do to remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?

Enter the switchport access vlan 3 command in interface configuration mode.
Enter the no vlan 2 and the vlan 3 commands in global configuration mode.
Enter the switchport trunk native vlan 3 command in interface configuration mode.
Enter the no shutdown in interface configuration mode to return it to the default configuration and then configure the port for VLAN 3.

8. Which two Layer 2 security best practices would help prevent VLAN hopping attacks? (Choose two.)

Change the native VLAN number to one that is distinct from all user VLANs and is not VLAN 1.
Disable DTP autonegotiation on end-user ports.
Change the management VLAN to a distinct VLAN that is not accessible by regular users.
Statically configure all ports that connect to end-user host devices to be in trunk mode.
Use SSH for all remote management access.

9. Fill in the blank. Use the full command syntax.

The   command displays the VLAN assignment for all ports as well as the existing VLANs on the switch.

show vlan brief

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

show interfaces Fa0/1 switchport
show mac address-table interface Fa0/1
show interfaces trunk
show vlan brief

11. Which command is used to remove only VLAN 20 from a switch?

no vlan 20
no switchport access vlan 20
delete flash:vlan.dat
delete vlan.dat

12. Which two statements are true about VLAN implementation? (Choose two.)

Devices in one VLAN do not hear the broadcasts from devices in another VLAN.
VLANs logically group hosts, regardless of physical location.
The network load increases significantly because of added trunking information.
The size of the collision domain is reduced.
The number of required switches in a network decreases.

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

on links that should not be trunking
when connecting a Cisco switch to a non-Cisco switch
on links that should dynamically attempt trunking
when a neighbor switch uses a DTP mode of dynamic auto
when a neighbor switch uses a DTP mode of dynamic desirable

14. A Cisco switch currently allows traffic tagged with VLANs 10 and 20 across trunk port Fa0/5. What is the effect of issuing a switchport trunk allowed vlan 30 command on Fa0/5?

It allows only VLAN 30 on Fa0/5.
It allows a native VLAN of 30 to be implemented on Fa0/5.
It allows VLANs 1 to 30 on Fa0/5.
It allows VLANs 10, 20, and 30 on Fa0/5.


Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
Which PCs will receive the broadcast sent by PC-C?



Place the options in the following order:
- not scored -
dynamic auto
dynamic desirable

17. Which switch feature ensures that no unicast, multicast, or broadcast traffic is passed between ports that are configured with this feature?

PVLAN protected port
switch port security

18. What is the effect of issuing a switchport access vlan 20 command on the Fa0/18 port of a switch that does not have this VLAN in the VLAN database?

VLAN 20 will be created automatically.
The command will have no effect on the switch.
Port Fa0/18 will be shut down.
An error stating that VLAN 20 does not exist will be displayed and VLAN 20 is not created.

19. Port Fa0/11 on a switch is assigned to VLAN 30. If the command no switchport access vlan 30 is entered on the Fa0/11 interface, what will happen?

Port Fa0/11 will be returned to VLAN 1.
VLAN 30 will be deleted.
An error message would be displayed.
Port Fa0/11 will be shutdown.


Refer to the exhibit. Interface Fa0/1 is connected to a PC. Fa0/2 is a trunk link to another switch. All other ports are unused. Which security best practice did the administrator forget to configure?

All user ports are associated with VLANs distinct from VLAN 1 and distinct from the ‘black-hole’ VLAN.
Configure all unused ports to a ‘black-hole’ VLAN that is not used for anything on the network.
Disable autonegotiation and set ports to either static access or static trunk.
Change the native VLAN to a fixed VLAN that is distinct from all user VLANs and to a VLAN number that is not VLAN 1.


Refer to the exhibit. A frame is traveling between PC-A and PC-B through the switch. Which statement is true concerning VLAN tagging of the frame?

No VLAN tag is added to the frame.
A VLAN tag is added when the frame is accepted by the switch.
A VLAN tag is added when the frame is forwarded out the port to PC-B.
A VLAN tag is added when the frame leaves PC-A.


In a basic VLAN hopping attack, which switch feature do attackers take advantage of?

the default automatic trunking configuration
automatic encapsulation negotiation
an open Telnet connection
forwarding of broadcasts

23. A Cisco Catalyst switch has been added to support the use of multiple VLANs as part of an enterprise network. The network technician finds it necessary to clear all VLAN information from the switch in order to incorporate a new network design. What should the technician do to accomplish this task?

Delete the startup configuration and the vlan.dat file in the flash memory of the switch and reboot the switch.
Erase the startup configuration and reboot the switch.
Erase the running configuration and reboot the switch.
Delete the IP address that is assigned to the management VLAN and reboot the switch.

24. What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?

All VLANs will be allowed across the trunk.
Only the native VLAN will be allowed across the trunk.
The switches will negotiate via VTP which VLANs to allow across the trunk.
Only VLAN 1 will be allowed across the trunk.

25. Which combination of DTP modes set on adjacent Cisco switches will cause the link to become an access link instead of a trunk link?

dynamic auto – dynamic auto
dynamic desirable – dynamic desirable
dynamic desirable – trunk
dynamic desirable – dynamic auto

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Espero haber ayudado en algo. Hasta la próxima oportunidad!

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