CCNA – VLAN Questions 2
Here you will find answers to VLAN Questions – Part 2
Question 1
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 2
Refer to the diagram. All hosts have connectivity with one another. Which statements describe the addressing scheme that is in use in the network? (Choose three)
A. The subnet mask in use is 255.255.255.192.
B. The subnet mask in use is 255.255.255.128.
C. The IP address 172.16.1.25 can be assigned to hosts in VLAN1
D. The IP address 172.16.1.205 can be assigned to hosts in VLAN1
E. The LAN interface of the router is configured with one IP address.
F. The LAN interface of the router is configured with multiple IP addresses.
Answer: B C F
Explantion
First we should notice that different VLANs must use different sub-networks. In this case Host A (172.16.1.126) and Host B (172.16.1.129) are in different VLANs and must use different sub-networks. But in this question, both answer A and B can separate VLAN 1 and VLAN 2 into different sub-networks . In particular, if the subnet mask is 255.255.255.192 we have
+ Sub-network 1: 172.16.1.0 -> 172.16.1.63
+ Sub-network 2: 172.16.1.64 -> 172.16.1.127 (assigned to VLAN 1)
+ Sub-network 3: 172.16.1.128 -> 172.16.1.192 (assigned to VLAN 2)
+ Sub-network 4: 172.16.1.192 -> 172.16.1.255
If the subnet mask is 255.255.255.128 we have 2 sub-networks:
+ Sub-network 1: 172.16.1.0 -> 172.16.1.127 (assigned to VLAN 1)
+ Sub-network 2: 172.16.1.128 -> 172.16.1.255 (assigned to VLAN 2)
But we should notice about the host part of each subnet mask. With 255.255.255.192 we have 2^6 – 2 = 62 hosts per subnet, which is smaller than the requirements of VLAN 1 (84 hosts) and VLAN 2 (114 hosts).
WIth 255.255.255.128 we have 2^7 – 2 = 126 hosts per subnet -> big enough for VLAN 1 & 2
-> B is correct.
The IP address 172.16.1.25, which is in the same sub-network with host A so it can be assigned to VLAN 1 -> C is correct.
To make different VLANs communicate with each other we can configure sub-interfaces (with a different IP address on each interface) on the LAN interface of the router -> F is correct.
Question 3
A network associate is trying to understand the operation of the FLD Corporation by studying the network in the exhibit. The associate knows that the server in VLAN 4 provides the necessary resources to support the user hosts in the other VLANs. The associate needs to determine which interfaces are access ports. Which interfaces are access ports? (Choose three)
A. Switch1 – Fa0/2
B. Switch1 – Fa0/9
C. Switch2 – Fa0/3
D. Switch2 – Fa0/4
E. Switch2 – Fa0/8
F. Router – Fa1/0
Answer: A C D
Explanation
Access ports are switch’s ports which are connected to hosts.
Question 4
What are three valid reasons to assign ports to VLANs on a switch? (Choose three)
A. to make VTP easier to implement
B. to isolate broadcast traffic
C. to increase the size of the collision domain
D. to allow more devices to connect to the network
E. to logically group hosts according to function
F. to increase network security
Answer: B E F
Question 5
Which statement is correct about the internetwork shown in the diagram?
A. Switch 2 is the root bridge.
B. Spanning Tree is not running.
C. Host D and Server 1 are in the same network.
D. No collisions can occur in traffic between Host B and Host C.
E. If Fa0/0 is down on Router1, Host A cannot access Server1.
F. If Fa0/1 is down on Switch3, Host C cannot access Server2.
Answer: E
Explanation
Switch 2 cannot be the root bridge because all ports of root bridges are designated ports. In the diagram switch 2 has one blocked port -> It is not the root bridge -> A is not correct.
Because Switch 2 has a blocked port so surely Spanning Tree Protocol is running -> B is not correct.
Host D belongs to VLAN 2 while Server 1 belongs to VLAN 3 so they are not in the same network -> C is not correct.
Host B & host C are connected through a hub so they are in the same collision domain and collision can occur -> D is not correct.
We need a router to allow different VLANs to communicate with each other. This router is called “router on a stick”. In this case it is Router1. The link between Router1 and Switch1 is configured as trunk link. If this link is down, different VLANs cannot communicate with each other -> E is correct.
If Fa0/1 is down on Switch3, Spanning Treel Protocol will “open” the blocked port on Switch 2 can Host C can access Server 2 through HostC -> Hub1 -> Switch2 -> Switch1 -> Router1-> Switch1 -> Server2 (notice that it must go through Router1 because they are in different VLANs). So F is not correct.
Question 6
Refer to the exhibit. Which of these statements correctly describes the state of the switch once the boot process has been completed?
A. As FastEthernet0/12 will be the last to come up, it will not be blocked by STP.
B. Remote access management of this switch will not be possible without configuration change.
C. More VLANs will need to be created for this switch.
D. The switch will need a different IOS code in order to support VLANs and STP.
Answer: B
Explanation
From the output we notice that the administrator has just shut down Interface Vlan1, which is the default VLAN so no one can access it remotely (like telnet) -> B is correct.
Answer A is not correct as STP calculation does not depend on which port comes up first or last. STP recalculates when there is a change in the network.
A normal switch can operate without VLAN -> C is not correct.
This IOS does support VLAN because it has VLAN 1 on it -> D is not correct.
@kenvin
See the host requirement in the digram, they need 84 and 114 host in each vlan. with 255.255.255.192 you are not meeting their host requirements. I hope I answer your question.
Q5 was there in today’s exam.
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Q4 in today’s exam.
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Aaron,So, what does this have to do with removing the misapdn PoE box? Did the DHCP server get migrated to the new switch too, and the ‘switchport voice vlan X’ configuration on the server port was unique to the new switch?Windows is weird with 802.1Q tagging. In my experience, the windows drivers configure the NIC to pass tagged traffic, but /strip/ the 802.1Q header. It’s about the most unhelpful combination I can imagine. I think Daniel Wood hit the nail on the head here. If the NIC had dropped the tagged packet, or left the tag intact (for the OS to drop), then everything would probably have been fine.Ever try assigning the VLAN ID with LLDP? The last place I worked tried and failed. I didn’t get enough details to know what went wrong. LLDP seems like the way to go, because it saves the administrative overhead of maintaining (possibly thousands) of VLAN assignments in the DHCP server.
Thanks 9tut!=D
Guest,
Agree – but, obviously, the ones below are not part of the answer.
Switch 1 – Fa0/5
Switch 2 – Fa0/6
For clarity, the question should have been: “Which interfaces below are access ports? (Choose three).”
It’s clear that some of the questions in these exams are designed to make people waste time reading and sometimes confuse them. So, I do understand your point.
dear 9tut or any body
i can see that it’s not me alone who is in doubt about question 2 exactly answer B.
why can’t you use 192 , coz using 128 make one range for the hosts to be in while you have 172.16.1.129 which is out of this range please help
ostazabgrino@hotmail.com
i agree with kevin7 in his logic so please 9tut help me coz i am confused and i will be entering the exam soon .
ostazabgrino@hotmail.com
@kevin7, @isam: Yes, the explanation of question 2 is not totally complete. Answer A is not correct because it only gives 2^6 – 2 = 62 hosts per subnet which is smaller than the requirements of VLAN 1 (84 hosts) and VLAN 2 (114 hosts).
Thanks for your detection. I updated the explanation!
I am not seeing anything about setting up a switch with an address — interface vlan 1–so you can telnet to that switch??? Is that somewhere on the 9tut site? — Is that on the CCNA test?
Question 1
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.
*** In 9tuts own explnation, it says that “VLAN increases the size of broadcast domains” and the below explanation says “VLAN decreasing the size of the broadcast domains”.
Which is it??? IMO it increases the number and/or size of Broadcast Domains because we added a VLAN. The only thing I could think of it decreasing anything is that it may decrease another different VLAN’s Broadcase Domain.
Can someone explain this becuase I am confused.
Question 6
Not so sure this is a good example because what if the default VLAN1 was changed and using another VLAN as the Default. The router when it boots up (it was restarted) is going to show things down in the log before it comes up and the log output is not long enough to really make a determination of anything.
Here is an example of a reload log:
*Mar 1 00:01:20.343: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
*Feb 28 19:01:22.975 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up
*Feb 28 19:01:23.872 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan268, changed state to down
*Feb 28 19:01:23.872 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan281, changed state to down
*Feb 28 19:01:23.872 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan300, changed state to down
*Feb 28 19:01:23.872 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan317, changed state to down
*Feb 28 19:01:24.320 EST: %LINK-5-CHANGED: Interface GigabitEthernet0/11, changed state to administratively down
*Feb 28 19:01:24.496 EST: %SYS-5-RESTART: System restarted –
Cisco IOS Software, C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 06-Apr-09 08:51 by amvarma
*Feb 28 19:01:25.320 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
*Feb 28 19:01:25.816 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
*Feb 28 19:01:25.816 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to up
*Feb 28 19:01:25.820 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/3, changed state to up
*Feb 28 19:01:25.824 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/4, changed state to up
*Feb 28 19:01:25.824 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/5, changed state to up
*Feb 28 19:01:25.828 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/9, changed state to up
*Feb 28 19:01:25.864 EST: %LINK-3-UPDOWN: Interface GigabitEthernet0/10, changed state to up
*Feb 28 19:01:26.896 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
*Feb 28 19:01:26.900 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up
*Feb 28 19:01:26.900 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/3, changed state to up
*Feb 28 19:01:26.900 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/4, changed state to up
*Feb 28 19:01:26.900 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/5, changed state to up
*Feb 28 19:01:26.904 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/9, changed state to up
*Feb 28 19:01:26.904 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/10, changed state to up
.May 16 14:56:46.535 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
.May 16 14:56:46.535 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan268, changed state to up
.May 16 14:56:46.535 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan281, changed state to up
.May 16 14:56:46.535 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan300, changed state to up
.May 16 14:56:46.535 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan317, changed state to up
As you can see, the other VLANs come up after the interfaces do, so what if another VLAN was the Default and VLAN1 was Admiend down by design. How can one really determine anything from the answers given? Cisco best practices don’t want you to use VLAN1 anyway, although every place I have worked at does.
Kurt
VLAN increase the number of broadcast domains.if you have a switched network where all your end devices connected to it then you have one broadcast domain.
If you divide this network into multiple VLANs (let’s say 5) then you have 5 broadcast domains because for the device on VLAN 3 to communicate with a device on VLAN 5 you need a router or in general a layer three device.
The size of the broadcast is referred to the amount of traffic caused by broadcast packets, so in the case we have only a switched network and one device sends a broadcast then all devices will receive it, but by placing this device in its own VLAN only devices on the same VLAN will receive the broadcast packet and as a result the amount of traffic caused by broadcast packets will be reduced.
I hope it helped
Thanks Mounir, that does clear it up.
Q5 was in my exam
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After creating a VLAN, you can manually assign a port to that VLAN and it will be able to communicate only with or through other devices in the VLAN…this is what mentioned in Ciscopress…i think the command will be rejected if there isn’t a vlan set previously
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@all
can someone explain this line
They increase the number of broadcast domains while decreasing the size of the broadcast domains.
what is “decreasing the size of the broadcast domains”
size size size…
thanks
Almira,
“decreasing the size of the broadcast domains” = connecting fewer devices to each domain (VLAN).
i.e. less devices affected by the broadcast address ff:ff:ff:ff:ff:ff
thanks JDB….now i get it
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Wow, lots of these ccna questions seem extremely unfair and the only way to get questions like # 5 right is through a brain dump. No where in the diagram does it show a broken connection to R1 or anything that would indicate that its not implementing dot1q. I got this question today and guessed. I got it wrong.
hello everybody
here in question 3 each user in different vlans need to communicate with server in vlan 4 for resources.so if f0/4 port of sw-2 connecting to vlan 4 is not trunked than how the users in other vlans will be able to communicate with server in vlan4?
@sunil
hey dude we dnt need trunk links to be configured on access ports……
every vlan device is connected to access link and not trunk links………we trunk links to forward traffic between multiple vlans & not to forward traffic between vlan host & its native switch……….so there is no need to configure a trunk link on fa0/4 port of sw-2…..here any server is also like a host/member of a vlan on that switch…so trunk will b configured only btw “sw-1 & sw-2″ & “sw-1 & router”………
jst remember this…trunk link is configured btw switch-to-switch & switch-to-router while dealing in vlan configuration…………..i hope i cleared your doubt………
@ankushk
i get it and doubt is clear.
thanks for reply dude.
Q1 Answer E makes no sense to me!
How do vlans decrease the size of broadcast domains
@Jonus
I am not sure if this will help but if your switch doesn’t have VLANs assigned to it’s ports, it is one big broadcast domain….once you assign vlans to the ports, your vlans become their own broadcast domain…therefore you are increasing the NUMBER of broadcast domains, but those domains themselves are decreasing in size…because instead of 24 ports on one domain, you now have say…4 ports on one broadcast domain,because you only have 4 ports on that specific VLAN.
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Took the exam today (11/24/2012) Q5 is in it. I wish I read it here, oo well atleat those of you who are reading this, make sure you memorize that picture and answer. It is the exact same picture and exact same multiple choice option and in exact same order. GOOD LUCK!
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hani_2012_rad@yahoo.com
I have three vlan(1,2,3).now i have assign the ports that fa0/1-2 to vlan 1 and fa0/3-4 to vlan 2 and fa0/5-6 vlan3 using the iprange 10.0.0.0/8
now my query is vlan 2 and vlan 3 can not communicate with each other as they belongs to different vlan but they can communicate with vlan 1.can any one tell me its possible.if yes then how
@ paul..
U restrict the communication in the same network you use only usable vlans the range should be 2 to 1001. 1 is the default vlan for all interfaces for switch priority(32768+1).hence this value should be known for all the interfaces in switchport. so they communicate..
vlan 1 (32768+1)..but the vlan 2 and vlan 3 the range of the value or different..(32770 & 32771)