CCNA – VLAN Questions
Here you will find answers to VLAN Questions
If you are not sure about VLAN, please read my VLAN tutorial.
Question 1
Refer to the exhibit. A network associate needs to configure the switches and router in the graphic so that the hosts in VLAN3 and VLAN4 can communicate with the enterprise server in VLAN2. Which two Ethernet segments would need to be configured as trunk links? (Choose two)
A. A
B. B
C. C
D. D
E. E
F. F
Answer: C F
Explanation
The link between the switches and the link between switch & router should be configured as trunks. Other links (connected to hosts) should be configured as access links.
Question 2
Which three statements are typical characteristics of VLAN arrangements? (Choose three)
A. A new switch has no VLANs configured.
B. Connectivity between VLANs requires a Layer 3 device.
C. VLANs typically decrease the number of collision domains.
D. Each VLAN uses a separate address space.
E. A switch maintains a separate bridging table for each VLAN.
F. VLANs cannot span multiple switches.
Answer: B D E
Explanation
By default, all ports on a new switch belong to VLAN 1 (default & native VLAN). There are also some well-known VLANs (for example: VLAN 1002 for fddi-default; VLAN 1003 for token-ring…) configured by default -> A is not correct.
To communicate between two different VLANs we need to use a Layer 3 device like router or Layer 3 switch -> B is correct.
VLANs don’t affect the number of collision domains, they are the same -> C is not correct. Typically, VLANs increase the number of broadcast domains.
We must use a different network (or sub-network) for each VLAN. For example we can use 192.168.1.0/24 for VLAN 1, 192.168.2.0/24 for VLAN 2 -> D is correct.
A switch maintains a separate bridging table for each VLAN so that it can send frame to ports on the same VLAN only. For example, if a PC in VLAN 2 sends a frame then the switch look-ups its bridging table and only sends frame out of its ports which belong to VLAN 2 (it also sends this frame on trunk ports) -> E is correct.
We can use multiple switches to expand VLAN -> F is not correct.
Question 3
By default, each port in a Cisco Catalyst switch is assigned to VLAN1. Which two recommendations are key to avoid unauthorized management access? (Choose two)
A. Create an additional ACL to block the access to VLAN 1.
B. Move the management VLAN to something other than default.
C. Move all ports to another VLAN and deactivate the default VLAN.
D. Limit the access in the switch using port security configuration.
E. Use static VLAN in trunks and access ports to restrict connections.
F. Shutdown all unused ports in the Catalyst switch.
Answer: B F
Question 4
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 5
Which two link protocols are used to carry multiple VLANs over a single link? (Choose two)
A. VTP
B. 802.1q
C. IGP
D. ISL
E. 802.3u
Answer: B D
Explanation
Cisco switches support two trunking protocols 802.1q & ISL. 802.1q is an open standard and is thus compatible between most vendors’ equipment while Inter-Switch Link (ISL) is Cisco proprietary.
Question 6
A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?
A. More collision domains will be created.
B. IP address utilization will be more efficient.
C. More bandwidth will be required than was needed previously.
D. An additional broadcast domain will be created.
Answer: D
Question 7
Which two statements about the use of VLANs to segment a network are true? (Choose two)
A. VLANs increase the size of collision domains.
B. VLANs allow logical grouping of users by function.
C. VLANs simplify switch administration.
D. VLANs enhance network security.
Answer: B D
Question 8
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 9
Which two statements describe the Cisco implementation of VLANs? (Choose two)
A. VLAN 1 is the default Ethernet VLAN.
B. CDP advertisements are only sent on VLAN 1002.
C. By default, the management VLAN is VLAN 1005.
D. By default, the switch IP address is in VLAN 1005.
E. VLANs 1002 through 1005 are automatically created and cannot be deleted.
Answer: A E
Question 10
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
I need your help, How do we set the VLAN setting of 2 vlans (a,b), if we have 2 routers connected each on with VLAN A and VLAN B, and we want inter-vlan communication between those routers
Like the figure in Question 1, but say that router in the figure is connected with another router witch connects to the same vlan. My question is how we see the link between those 2 router. Are we using subinterfaces ?
disregard the last comment, i solv it, thanks
Passed CCNA, question 7 from here.
in Q3 can someone please explain why choices A,C and D are not correct ?? they look correct to me
q 10 was in the exam
q 10 was from here
Q.6: I think when you create a new VLAN it is not a broadcast domain yet as it has no member. But when you add 1 port that means you have at least one member and it creates a broadcast domain.
Hi Sno,I’d love to hear the reasoning behnid the IST VLAN ID having to be set to 2. There is no requirement that the IST VLAN be any specific number nor that the MLT ID be any specific number. Actually you can use different MLT IDs on each core switch, obviously you need to use the same VLAN ID on both switches though.In my experiences VRRP is nice but it causes a lot of scaling issues as the number of VRRP instances grow. Depending on which software release you are running I would suggest that you use RSMLT in place of VRRP. I’ve found that RSMLT is much more behaved and uses a lot less resources than VRRP.In any event (depending on the software release) you are probably running up against a scaling issue where the VRRP hellos are not being processed fast enough. You could keep VRRP, disable the FAST-ADV feature and use the Backup Master feature. This would provide instantaneous fail-over and also help load-balance the traffic between your VRRP peers.Good Luck with the VLAN conversion!
Q8)
B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.
C. A native VLAN mismatch error message will appear.
Correct answer should be B.
A native VLAN mismatch error message will appear, only if the CDP is enabled on both Switches that is not mentioned on the Question.
Question 5 was in my today exam.
@GJ,
Native Vlan mismatch has nothing to do with CDP, since DOT1Q trunking protocol detects the mismatch here.
Since it is a “trunk link” the native vlan mismatch will definitely occur irrespective of the status of CDP. The respective switches will send their native packets (Vlan1 and Vlan 10 tagged) through the trunk and that just ends up in Vlan bleeding.. Not untagged frames.
Side note: Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error messages on the console output..
@Kumar
On a Trunk – Native Vlan traffic goes as UNTAGGED & both vlan 10 & vlan 1 will be connected which should not be happen.
Even though DOT 1Q identify as a native vlan mismatch, CDP need to be there & it should be a Cisco device.
Answer is C as with below link.
http://www.ciscopress.com/articles/article.asp?p=29803&seqNum=3
the native VLAN must match on both sides of the trunk link for 802.1Q;
***** otherwise the link will not work.
If there is a native VLAN mismatch, Spanning Tree Protocol (STP) places the port in a port VLAN ID (PVID) inconsistent state and will not forward on the link.
Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error messages on the console output.
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i am designing a network comprising 6Vlans using one cisco 3960 series switch,is it advisable to activate VTP since am not using multiple switches.
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Q 6 : Ans :
If you add Ports in existed
Vlan then it will not make broadcast domain. It is making new vlan, so Vlan = Broadcast domain.
In a network, HR vlan can access the other vlan but other vlan can’t access hr vlan .
Is it happen to possibilities in network.
If it is happen please how it will happen explain me please..
q10 why is the answer a,e,f not a,b,e
To samar:
q10 answer b is talking about packet filter. Packet is layer 3 stuff. switch is layer 2.
Rajan:
use ACL will do
I took me a while to get it, make sure you read the question carefully
all ports are in vlan 2 = 1 broadcast domain
then there is a new vlan created, let’s say vlan 22
now we have two vlans = vlan 2 + vlan 22 = 2 broadcast domains
I don’t why I was thinking that the new switch ports are added to the same vlan, silly me
Is it possible to use a network of 192.168.0.0 and have subnets 192.168.64.0 and 192.168.65.0 for one vlan and use S/M 255.255.254.0? Thank you for your response.
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Thanks 9-tut, I passed my CCNA 200-120, the new questions you have added to the site were pure qenius as they helped me pass. word to the wise for anyone who is thinking of taking this exam and has no real world experiance on cisco equipment, gen up on SNMP & Netflow as they are now asking questions and understanding of SNMP & Netflow.
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