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.
question 6. Doesn’t this assume that there is only one Vlan (vlan1) existing? Is there really enough information here to make the assumption that there is only Vlan1 configured? Thanks
9tut..can you please help with the answer of question 6.
Dumps says option C is correct….Thanks!!
@tyler: No, there is not enough information about other VLANs.
@Jass
Question 6: Answer B is correct. I’m sure.
Thanks 9tut..
@ Jass: I think C is not correct because it states adding VLANs without mentioning clearly that the VLAN to be added is the management VLAN. I believe the best answer is B.
I have confusion between answer E and F
I added explanation to question 5, kindly check again.
Can you please explain question No. 2
Sandeep.
vlan 1 has 84 hosts and the ip address of one of the hosts is 172.16.1.126
vlan2 has 114 hosts and the ip address of one of the host sis 172.16.1.129
the subnet has to have 7 host bits which will accomodate 2 to the power 7 less 2 making it 126 hosts.
that makes the mask in use 255.255.255.128 as this will leave 7 host bits. block size 128
that makes the valid subnets 172.16.0.0 172.16.0.128 172.16.1.0 172.16.1.128 172.16.2.0 172.16.2.128 …………
so for the vlan 1 subnet 172.16.1.0 the valid ip addresses being 172.16.1.1 to 172.16.1.126
vlan 2 172.16.1.129 to 172.16.1.254 as valid ip addresses.
that makes B and C answers Obviously F as to communicate between the vlans sub-interfaces have to be configured on the router.
Question 3 is a ridiculous question. All of the host ports should be access ports meaning the following should all be access ports:
Switch 1 – Fa0/2
Switch 1 – Fa0/5
Switch 2 – Fa0/4
Switch 2 – Fa0/6
Switch 2 – Fa0/3
Just because you assign a port to a different vlan on a switch doesn’t mean it needs to be a trunk. Trunks are only for multiple vlan connections. Cisco should get rid of this question!
i need some questions on ccna 1 network fundamental
in one dump, I found this question:
Vlan 3 is not 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
Which variant is correct?
ans is A….sw w/o vlan 3 yet…use command -if> switchport access mode vlan 3 then enter ..show vlan brief…vlan 3 stored w/o config >vlan 3….
@nikita
ans A is correct.
When i set this command in packet tracer, it is rejected
@nikita
Switch>en
Switch#conf t
Switch(config)#int fa0/1
Switch(config-if)#switchport access vlan 3
% Access VLAN does not exist. Creating vlan 3
this is what you should do after creating the vlan 3……switch(config)#vlan 3
switch>en
switch#conf t
switch(config)#int fa0/1
switch(config-if)#switchport mode access
switch(config-if)#switchport access vlan 3
make sure int fa0/1 is not connected to another switch as trunk port only then it will take
Firends.
1) VLAN should be created.
2) VLAN should be add to desired port.
How do you add port to VLAN 3, if VLAN 3 don´t exist?
@claudio
1:
en
vlan database
vlan 3
exit
conf t
interface fa 0/1
switchport mode access
switchport access vlan 3
2:
en
conf t
vlan 3
exit
interface fa 0/1
switchport mode access
switchport access vlan 3
3:
en
conf t
interface fa0/1
switchport mode access
switchport access vlan 3
all 3 do the same thing.
xallax
nice!!
1:
en
vlan database
vlan 3
exit
conf t
interface fa 0/1
switchport mode access
switchport access vlan 3
didnt know you can add a vlan this way..
didnt know there was such a thing as “Switch(vlan)#”
Question no. 5. Nice explanation. Many thanks 9tut. See again.
@ anyone can u send me the latest CCNA actual exam?
please send it to sab3001@hotmail.com
Appreciate anyone who will share it. Thanks!
Hi All inclding 9 Tut
Question 3, is seems to be very wiered one am I right! if not please shed some light in it!
Mnay thanks
@BMW: It’s simple. Links between switches and links between router&switch – will be trunk links and corresponding ports will be trunk ports. Links from switch to host/server/printer will be access links and ports will be access ports.
in qu.no 1,what this mean
They increase the number of broadcast domains while decreasing the size of the broadcast domains.
@DimS Yes thanks after such long thought it works and its really help. Cheers
@ Nikita
in one dump, I found this question:
Vlan 3 is not 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
Which variant is correct?
correct answer: A. The command is accepted and the respective VLAN is added to vlan dat
If someone has the new dumps, please send it to me. i will be taking the ccna next week.
ssunnykamboj@gmail.com
If someone has the new dumps, please send it to me. i will be taking the ccna next week.
nikos_g_s@hotmail.com
If someone has the latest CCNA actual exam questions and latest dump , please send it to me, i’ll take the ccna exam next week.
eng.yassminma@yahoo.com
really good question n explanation awesome………..
thks sir
Nice explanation 9tut.Thanks! I will take the ccna exam tom…:) If ever someone has a latest ccna dumps pls send it to me! thank you!
dominic.santos0619@yahoo.com
9tut your portals are splendid….for CCNA and CCNP guys…May God keep this site working endlessly and cause it to grow further…..
can any one help me,i want to re-take ccna exam is the exam from this 9tut?
Very nice 9tut go on ;) :)
If someone has the new dumps, please send it to me. i will be taking the ccna next week.
swit.birath5@gmail.com
raphael
i wrote my ccna exam this morning and i score 867.the dump are still valid eigrp,vtp
and acl are the simulation qusts thanks to 9tut,examcollection and karrox
Hi 9tut!
I’ve been reviewing the tutorials here and all seems very useful.
I’ll be taking the ccna exam this coming december 20. can someone send me the latest dumps to me at mack_lumahan@yahoo.com.ph
thanks 9tut and more power to us!
Hi 9tut
I think the answer A switch 1 – Fa0/2 as a trunk link is wrong, its a access port as it is connected to the host.
Answer should be Switch 2 – Fa0/8 which is configured as trunk port to be able to carry the VLAN info to Switch 1.
@Neha
Take a second look at the question. The question is asking for access ports not trunk links.
Option A-switch 1 Fa0/2 is an access port. Be thorough when reading the question. Thanks.
please send me latest dump for ICND 2
hotwheel005@hotmail.com
Hi 9tut and Xallas,
I know this following question has discussed somewhere else but I can not find it. So I post it again. Here it is:
http://img103.herosh.com/2012/01/04/385765807.jpg
My answers is C, not D because the directly connect route (in this instance is subinterface) is the prefer route in compare with routes learned from RIP.
Any comments?
@hai
i was convinced that D is correct then read Q8 from here:
http://www.9tut.com/ccna-rip-questions
the line colors play a part too :)
@xallax
Hahah what a trap!!! Thank you so much.
You know, it made me waste my time to simulate on Packet Tracer. When I configured the router on the stick, I thought who stupid to design this topology because it doesnt make any sense in the manner of redundancy.
Here is my simulation (a little dumb on the default gateways for 2 VLANs, however RIP does work even though RIP routes are not added to the routing table and ping between different VLANs works too)
http://img103.herosh.com/2012/01/05/81557219.jpg
@9tut
Q 1 Explaination
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.
Does a VLAN increase or decrease the size of the broadcast domains ?!!!!
@Mahmoud: VLANs decrease the size of broadcast domain but increase the number of broadcast domains.
Hi 9tut… Hi Guys! Can you please help me… I will take exam this Feb. Please send me latest dump so that I will have an idea for the exam.. rico.blake@ymail.com
Thanks Guys!
would you please send me the latest dumps, because i have exam next week, thanks.
mehdi_z9@yahoo.com
thanks
@9tut
the answer for Q2 is correct but the reasoning seems to be incorrect as
A. The subnet mask in use is 255.255.255.192 is also a valid anwer according to your reasoning.
subnets for 255.255.255.192 is
172.16.1.0—172.16.1.64
172.16.1.64—172.16.1.128
172.16.1.128—172.16.1.192
172.16.1.126 is within the range of 172.16.1.64—172.16.1.128 and
172.16.1.129 is within the range of 172.16.1.128—172.16.1.192
they are still on different subnets. Please correct me if I am wrong?
could any one please send me new dumps at mahm_elsaid@yahoo.com
@kenvin
See the host requirement in the digram, they need 84 and 114 host in each vlan. with 255.255.255.192 you are meeting their host requirements. I hope answer your question.