New CCNA – VLAN Questions
Note: If you are not sure about Virtual Local Area Network (VLAN), please read our Virtual Local Area Network VLAN Tutorial.
Question 1
What are three benefits of implementing VLANs? (Choose three)
A. A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure
B. Broadcast storms can be mitigated by decreasing the number of broadcast domains,thus increasing their size.
C. A higher level of network security can be reached by separating sensitive data traffic from other network traffic.
D. Port-based vlans increase switch-port use efficient,thanks to 802.1Q trunks
E. A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.
F. Broadcast storms can be mitigated by increasing the number of broadcast domains,thus reducing their size.
G. VLANs make it easier for IT staff to configure new logical groups,because the vlans all belong to the same broadcast domain.
Answer: C E F
Question 2
VLAN 3 is not yet configured on your switch. What happens if you set the switchport access vlan 3 command interface configuration mode?
A. The command is accepted and the respective VLAN is added to vlan.dat.
B. The command is rejected.
C. The command is accepted and you must configure the VLAN manually.
D. The port turns amber.
Answer: A
Explanation
Even VLAN 3 is not yet configured on the switch, we can set the switchport access vlan 3 command without no problem and it also displays when we type the “show running-config” command.
Question 3
What are three advantages of VLANs? (Choose three)
A. VLANs establish broadcast domains in switched networks.
B. VLANs utilize packet filtering to enhance network security.
C. VLANs provide a method of conserving IP addresses in large networks.
D. VLANs provide a low-latency internetworking alternative to routed networks.
E. VLANs allow access to network services based on department, not physical location.
F. VLANs can greatly simplify adding, moving, or changing hosts on the network.
Answer: A E F
Question 4
On corporate network, hosts on the same VLAN can communicate with each other, but they are unable to communicate with hosts on different VLANs. What is needed to allow communication between the VLANs?
A. a router with subinterfaces configured on the physical interface that is connected to the switch
B. a router with an IP address on the physical interface connected to the switch
C. a switch with an access link that is configured between the switches
D. a switch with a trunk link that is configured between the switches
Answer: A
Question 5
Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports Fa0/13. An 802.1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native VLAN is not specified. What will happen in this scenario?
A. 802.1Q giants frames could saturate the link.
B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.
C. A native VLAN mismatch error message will appear.
D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.
Answer: C
Explanation
A “native VLAN mismatch” error will appear by CDP if there is a native VLAN mismatch on an 802.1Q link. “VLAN mismatch” can cause traffic from one vlan to leak into another vlan.
Question 6
Which of the following are benefits of VLANs? (Choose three)
A. They increase the size of collision domains.
B. They allow logical grouping of users by function.
C. They can enhance network security.
D. They increase the size of broadcast domains while decreasing the number of collision domains.
E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.
F. They simplify switch administration.
Answer: B C E
Explanation
When using VLAN the number and size of collision domains remain the same -> A is not correct.
VLANs allow to group users by function, not by location or geography -> B is correct.
VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network -> C is correct.
VLAN increases the size of broadcast domains but does not decrease the number of collision domains -> D is not correct.
VLANs increase the number of broadcast domains while decreasing the size of the broadcast domains which increase the utilization of the links. It is also a big advantage of VLAN -> E is correct.
VLANs are useful but they are more complex and need more administration -> F is not correct.
Question 7
A frame from VLAN1 of switch S1 is sent to switch S2 where the frame received on VLAN2. What causes this behavior?
A. trunk mode mismatches
B. vlans that do not correspond to a unique IP subnet
C. native vlan mismatches
D. allowing only vlan 2 on the destination.
Answer: C
Explanation
For 802.1q encapsulation, the native VLAN must matched at both side; otherwise the link will not work. In this case the native VLAN of S1 is 1 while the native VLAN of S2 is 2.
Question 8
Which statement about vlan operation on Cisco Catalyst switches is true?
A. when a packet is received from an 802.1Q trunk, the vlan id can be determined from the source MAC address table.
B. unknown unicast frames are retransmitted only to the ports that belong to the same vlan.
C. ports between switches should be configured in access mode so that vlans can span across the ports.
D. broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
Answer: B
Explanation
Answer A is not correct because when a packet is received from an 802.1Q trunk, it always carries VLAN ID information in the VLAN tag portion so the switch does not need to look up its source MAC address table to determine the VLAN ID of that packet.
Question 9
Which two benefits are provided by creating VLANs? (Choose two)
A. added security
B. dedicated bandwidth
C. provides segmentation
D. allows switches to route traffic between subinterfaces
E. contains collisions
Answer: A C
Question 10
Assuming the default switch configuration which vlan range can be added modified and removed on a Cisco switch?
A. 2 through 1001
B. 1 through 1001
C. 1 through 1002
D. 2 through 1005
Answer: A
Explanation
VLAN 1 is the default VLAN on Cisco switch. It always exists and can not be added, modified or removed.
VLANs 1002-1005 are default VLANs for FDDI & Token Ring and they can’t be deleted or used for Ethernet.
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VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network -> C is correct.
As much as I wish this was true, you can never fix silly mistakes(well you can but after you’ve made them). Config errors happen and VLANs fixing VLANs is just wrong. Limiting misconfiguration doesn’t really tighten security just makes sure the stuff you have works
Sction Vlan Questions
IMHO
In question 5 B and C should be true. We will have vlan mismatch error and and each native vlan (vlan 10 for cat1 and vlan 1(default) for cat 2) will send untaged frames.
Moreover we can find confirmation of this is question 7, where we deal with vlan mismatch and frame send on vlan 1 sw1 is reived on vlan 2 sw2. This is because both vlans are native==untaged
Please correct me if I am wrong
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Q5.
I agree with Azbi. I would even say, that if CDP happens to be disabled, only answer B is correct. Can we know that CDP is active? Many questions state “the default configuration was not changed”, but this one does not. Perhaps Cisco accept both answers as correct?
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router R1 config subinterface as below.
R1(config)#interface f0/0.2
R1(config)#encapsulation dot1Q 2
R1(config)#ip address 192.168.2.1 255.255.255.0
R1(config)#interface f0/0.3
R1(config)#encapsulation dot1Q 3
R1(config)#ip address 192.168.3.1 255.255.255.0
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Question 2 in today’s exam
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Why on Question 1 Q1
D. Port-based vlans increase switch-port use efficient,thanks to 802.1Q trunks (why this is incorrect)
E. A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.(why this one is correct if I don´t have more bandwidth by having more VLANs, where is the efficientcy on that?)
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Question 10, shouldn’t the correct answer be D, manageable vlans are 2-1005?
no u can’t modify vlan 1002-1005 the correct answer is a
Q2 – VLAN 3 still have to be manually added.
Can someone explain to me why the vlan.dat answer “is better” than the one which requires manual add?
Ricardo,
I sent you a link. The question is tricky, tricky. GO down the page about a quarter of the way and you’ll see the reference to your question. Also, if you lab up a few switches, you can re-create what the question is trying to get from you.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/configuration/guide/3550scg/swvlan.html
REFERENCE:
If you assign an interface to a VLAN that does not exist, the new VLAN is created.
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new question:
QUESTION 24
Refer to the exhibit.
The output that is shown is generated at a switch. Which three of these statements are true? (Choose
three.)
“”””””””
switchA# show spanning tree vlan 30
spanning tree enabled protocol RSTP
Root ID priority 24606
this bridge is the root bridge
“”””””””
A. All ports will be in a state of discarding, learning, or forwarding.
B. Thirty VLANs have been configured on this switch.
C. The bridge priority is lower than the default value for spanning tree.
D. All interfaces that are shown are on shared media.
E. All designated ports are in a forwarding state.
F. This switch must be the root bridge for all VLANs on
the correct ans:
A, C, and E
another question:
What are three advantages of VLANs? (Choose three.)
A. VLANs establish broadcast domains in switched networks.
B. VLANs utilize packet filtering to enhance network security.
C. VLANs provide a method of conserving IP addresses in large networks.
D. VLANs provide a low-latency internetworking alternative to routed networks.
E. VLANs allow access to network services based on department, not physical location.
F. VLANs can greatly simplify adding, moving, or changing hosts on the network.
Ans:
A,E,F
A network administrator needs to configure port security on a switch. Which two statements are true?
(Choose two.)
A. The network administrator can apply port security to dynamic access ports.
B. The network administrator can apply port security to EtherChannels.
C. When dynamic MAC address learning is enabled on an interface, the switch can learn new addresses,
up to the maximum defined.
D. The sticky learning feature allows the addition of dynamically learned addresses to the running
configuration.
E. The network administrator can configure static secure or sticky secure MAC addresses in the voice
VLAN.
Correct Answer: CD
Question 3 was in the exam recently
what is this Q1? O_o
Plz anyone say detailly answer about question 10
Q 10….Assuming the default switch configuration which vlan range can be added modified and removed on a Cisco switch?
Answer. 2 through 1001 …..
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Q3 why VLANs can greatly simplify adding, moving, or changing hosts on the network ? I thought it more complicated than no vlan on network.
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