VLAN VTP STP Questions
Here you will find answers to VLAN, VTP, STP questions
If you are not sure about VLAN, VTP, STP please read my VLAN tutorial, VTP tutorial and STP tutorial.
Question 1
Two switches SA and SB are connected as shown below. Given the below partial configuration, which two statements are true about VLAN traffic? (Choose two)
A – VLANs 1-5 will be blocked if fa0/10 goes down.
B – VLANs 6-10 have a port priority of 128 on fa0/10.
C – VLANs 6-10 will use fa0/10 as a backup only.
D – VLANs 1-10 are configured to load share between fa0/10 and fa0/12.
Answer: C D
Explanation:
Let’s assume that SA is the root bridge for all VLANs, it will make the explanation a bit clearer…
First we should understand what will happen if nothing is configured (use default values). Because we assumed that SA is the root bridge so all of its ports will forward. SB will need to block one of its ports to avoid a bridging loop between the two switches. But how does SB select its blocked port? Well, the answer is based on the BPDUs it receives from SA. A BPDU is superior than another if it has:
1. A lower Root Bridge ID
2. A lower path cost to the Root
3. A lower Sending Bridge ID
4. A lower Sending Port ID
These four parameters are examined in order. In this specific case, all the BPDUs sent by SA have the same Root Bridge ID, the same path cost to the Root and the same Sending Bridge ID. The only parameter left to select the best one is the Sending Port ID (Port ID = port priority + port index). If using default values, the default port priority’s value is 32 or 128 (128 is much more popular today but 32 is also a default port priority’s value), so SB will compare port index values, which are unique to each port on the switch, and because Fa0/12 is inferior to Fa0/10, SB will select the port connected with Fa0/10 (of SA) as its root port and block the other port.
To change the default decision of selecting root port, we can change the port priority of each interface. The above picture is true for VLAN 1-5 because port Fa0/10 has a lower port-priority so the peer port will be chosen as the root port. For VLAN 6-10, port Fa0/12 has higher priority ID (lower port priority value) so SB will block its upper port.
For answer A – “VLANs 1-5 will be blocked if fa0/10 goes down” – is not correct because if Fa0/10 goes down, SB will unblock its lower port therefore VLANs 1-5 will still operate.
For answer B – “VLANs 6-10 have a port priority of 128 on fa0/10″ – is not always correct because VLAN 6-10 can have a different port priority (of 32) according to the Cisco’s link below.
Answer C is correct because VLAN 6-10 uses Fa0/12 link as it main path. Fa0/10 is the backup path and is only opened when port Fa0/12 fails.
Answer D is correct because this configuration provide load-balance traffic based on VLAN basis. VLANs 1-5 use Fa0/10 and VLANs 6-10 use Fa0/12 as their main paths.
Note: We can not assure the answer B is always correct so we should choose C and D if the question asks us to give only 2 choices).
Reference (and good resource, too):
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96a.shtml
Question 2:
The network operations center has received a call stating that Users in VLAN 107 are unable to access resources through R1. From the information contained in the graphic, what is the cause of this problem?
A – spanning tree is not enabled on VLAN 107
B – VTP is pruning VLAN 107
C – VLAN 107 does not exist on switch SA
D – VLAN 107 is not configured on the trunk
Answer: B
Explanation:
“VLAN allowed on trunk” – Each trunk allows all VLANs by default. However, administrator can remove or add to the list by using the “switchport trunk allowed” command.
“VLANs allowed and active in management” – To be active, a VLAN must be in this list.
“VLANs in spanning tree forwarding state and not pruned” – This list is a subset of the “allowed and active” list but with any VTP-pruned VLANs removed.
All VLANs were configured except VLAN 101 so D is not correct. VLAN 107 exists in the “allowed and active” section so A and C are not correct, too. In the “forwarding state and not pruned” we don’t see VLAN 107 so the administrator had wrongly configured this VLAN as pruned.
Question 3:
The network administrator needs to enable VTP pruning within the network. What action should a network administrator take to enable VTP pruning on an entire management domain?
A – enable VTP pruning on every switch in the domain
B – enable VTP pruning on any client switch in the domain
C – enable VTP pruning on any switch in the management domain
D – enable VTP pruning on a VTP server in the management domain
Answer: D
Question 4:
Study the diagram below carefully, which three statements are true? (Choose three)
A – DTP packets are sent from Switch SB.
B – DTP is not running on Switch SA.
C – A trunk link will be formed.
D – The native VLAN for Switch SB is VLAN 1.
Answer: A C D
Explanation:
Dynamic Trunking Protocol (DTP) is the Cisco-proprietary that actively attempts to negotiate a trunk link between two switches. If an interface is set to switchport mode dynamic desirable, it will actively attempt to convert the link into trunking mode. If the peer port is configured as switchport mode trunk, dynamic desirable, or dynamic auto mode, trunking is negotiated successfully -> C is correct.
SB is in “dynamic desirable” mode so it will send DTP packets to SA to negotiate a trunk link -> A is correct.
On an 802.1Q trunk, DTP packets are sent on the native VLAN. By default, it is VLAN 1 (notice that SA’s native VLAN is 5) -> D is correct.
(Note: an 802.1Q trunk’s native VLAN is the only VLAN that has untagged frames)
Below is the switchport modes for easy reference:
| Mode | Function |
| Dynamic Auto | Creates the trunk based on the DTP request from the neighboring switch. |
| Dynamic Desirable | Communicates to the neighboring switch via DTP that the interface would like to become a trunk if the neighboring switch interface is able to become a trunk. |
| Trunk | Automatically enables trunking regardless of the state of the neighboring switch and regardless of any DTP requests sent from the neighboring switch. |
| Access | Trunking is not allowed on this port regardless of the state of the neighboring switch interface and regardless of any DTP requests sent from the neighboring switch. |
| Nonegotiate | Prevents the interface from generating DTP frames. This command can be used only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link. |
Question 5:
Regarding the exhibit and the partial configuration of switch SA and SB. STP is configured on all switches in the network. SB receives this error message on the console port:
00:06:34: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/5 (not half duplex), with SA FastEthernet0/4 (half duplex), with TBA05071417(Cat6K-B) 0/4 (half duplex).
What would be the possible outcome of the problem?
A – The root port on switch P4S-SB will fall back to full-duplex mode.
B – The interfaces between switches P4S-SA and P4S-SB will transition to a blocking state.
C – The root port on switch P4S-SA will automatically transition to full-duplex mode.
D – Interface Fa0/6 on switch SB will transit to a forwarding state and create a bridging loop.
Answer: D
Explanation:
From the output, we learned that the interfaces on two switches are operating in different duplex modes: Fa0/4 of SA in half-duplex mode & Fa0/5 of SB in full-duplex mode. In this case, because SB is operating in full duplex mode, it does not check the carrier sense before sending frames (CSMA/CD is not used in full-duplex mode). Therefore, SB can start to send frames even if SA is using the link and a collision will occur. The result of this is SA will wait a random time before attempting to transmit another frame. If B sends enough frames to A to make every frame sent from A (which includes the BPDUs) get dropped then SB can think it has lost root bridge (B does not receive BPDUs from A anymore). Therefore SB will unblock its Fa0/6 interface for transmitting and cause a bridging loop.
Question 4:
The trunk will form (C is correct) but will you get error messages about mismatched Native VLAN since SA is native vlan 5 and SB is by default native vlan 1? Thanks!
@SYSCO
yes, there will be a default native vlan mismatch err message.
But it’s ok, at least the other vlans beyond vlan 1 & 5 still work fine.
I didn’t check out the vlan 1 or 5 working state, so I cann’t tell if they are ok, it seems to be ok.
With reference to questioin n. 1
For answer B – “VLANs 6-10 have a port priority of 128 on fa0/10″ – is not always correct because VLAN 6-10 can have a different port priority (of 32) according to the Cisco’s link below.
The link reported refers to a CatOs configuration. On IOS the default port priority is 128. Then we should have three correct answers: B,C,D.
Refferring to question 2.
It is not clear why VTP should prune VLAN 107 on switch A. The operator can configure VLAN 107 as “prune eligible” (Command: switchport trunk pruning vlan 107). But that does not mean that this vlan will be pruned. It means that vlan 107 CAN be pruned if switch B asks SW A to prune it. And Swigtch B should not send a prune message to SW A unless vlan 107 is not wanted from SW C. Then it seams to me that no answer is correct!!
i can has cheeseburger?
hope and change
@ legba
good luck in your exam today
@Giorgio
Q1 asks for TWO statements which are true about VLAN traffic. Yes, default port priority is 128 for all ports, but it doesnt prove that priority is 128 for VLANs 6-10.
Answer : C,D
@Giorgio
The answer for Q2 “VTP is pruning VLAN 107″ doesn’t mean that it be pruned. Just VLAN 107 is being pruned incorrectly. In this example,VLAN 7, 101, 106, and 107 are being pruned. By disabling VTP pruning, VLAN 107 should be able to once again gain access.
@Giorgio
The answer for Q2 “VTP is pruning VLAN 107″ doesn’t mean that VTP should prune VLAN 107. Just VLAN 107 is being pruned incorrectly. In this example,VLAN 7, 101, 106, and 107 are being pruned. By disabling VTP pruning, VLAN 107 should be able to once again gain access.
@sysco
Q4:
■ Native VLAN. You can bring up a trunk with different native VLANs on each end;
however, both switches will log error messages about the mismatch, and the potential
exists that traffic will not pass correctly between the two native VLANs. (ref: 642-813 official certification guide, page 79)
It’s really a nice and helpful piece of information. I’m glad that you shared this helpful info with us. Please keep us informed like this. Thanks for sharing.
question 1 :
stp check 1- cost
2- BID
3- Port-ID
i think that response is B and C
Port ID for vlan 6-10 is default 128.port id in fa O/10 => vlan 6-10 use fa0/12
and fa0/10 as backup
D is also true !!!
Mixed practices 3 TK—>
Wich configuration option will cause the link between two cisco 3600 become a funcional trunk:
a)switchport dynamic auto
switchport dynamic auto
b)switchport access vlan 10
switchport dynamic desirable
c)switchport mode trunk
switchport no negociate
d)leave both ports with the default trunk settings…
Correct answer B.?¿¿??¿¿? I think the correct answer its D ¡¡¡¡¡
Can anyone confirm this?
To extran,
yes correct answer is D as the defaullt switchport mode is dynamic desirable.So , two switchport mode ( dynamic desirable ) will use DTP to convert link to be trunk.
some really nice and useful information on this web site(Charlxtz)
@ Ahmed, Extran
First we should establish whether Cisco 3600 is a router or a switch.
Mario, Thank you for your note. I will take 642-813 exam …can you send me last dumps if you have?
ahmedessam89@rocketmail.com
For question 1: The correct answer is B and C
Explanation:
Answer B is correct because the default port priority is set by Cisco is 128, since there are no more configurations applied and exhibit to the interfaces, we assume that it is on the default priority.
Answer D is not correct since the term load Share is not used in Cisco, instead the term Load balancing is used and it has the function to use the Root Bridge with the following port status: “Desg FWD”, but the other Switch will be on “Root FWD” and most important “Altn BLK”. (It will be good to have a more complete output on this one).
hey guys,thank you for the useful information that you provide in this site.Am going to take my switch exam tomorrow.having prepared with the foundation guide and official certification guide am hoping for the best.thank you.
Hey I am going through the P4S 497 and I am not sure about one of the answers.
The question is on page 117
“Under what circumstances would an administrator prefer Local VLANs over End-To-End Vlans”
the answer says it is “80% of traffic is destined for internet sites”
but from my research it should be “80% of traffic is destined for work groups own local server”
The reason I think it is the other is because of (http://www.informit.com/articles/article.aspx?p=102234)
“There are two generic rules when dealing with traffic flow: 80/20 and 20/80. The 80/20 rule assumes that 80% of the traffic stays local to a VLAN and 20% leaves a VLAN through a Layer 3 device. Local VLANs assume this premise. Note that with this implementation, VLANs are solely used to solve broadcast problems. ”
Any clarification would be greatly appreciated!
Q1, Why I must accept SWA root bridge?
I think the right answers are B and D.
B because default port priority is 128
D because different instances of STP are shared between SWA and SWB
@ Scolpi Still the right answer is C & D, weather you accept the SW-A as root Bridge or NOT create same topology in Packet tracer and confirm it.
@NAD
Q1 two Catalyst 2950:
SWA#sh run int fas 0/10
Building configuration…
Current configuration : 98 bytes
!
interface FastEthernet0/10
switchport mode trunk
spanning-tree vlan 1-5 port-priority 16
end
SWA#sh run int fas 0/12
Building configuration…
Current configuration : 99 bytes
!
interface FastEthernet0/12
switchport mode trunk
spanning-tree vlan 6-10 port-priority 16
end
SWA#sh spanning-tree vlan 6
VLAN0006
Spanning tree enabled protocol ieee
Root ID Priority 32774
Address 000a.4178.8000
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32774 (priority 32768 sys-id-ext 6)
Address 000a.4178.8000
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/12 Desg FWD 19 16.12 P2p
In vlan 6, but the same for other, port-priority of fa0/10 is always 128!!!
B is correct
Catalyst 2950, don’t permit to set priority 10, so I have to set 16.
Layer 2 Switches and s support standard STP as described in the IEEE 802.1D specification. A Brocade device has one port-based VLAN VLAN 1 by default that contains all the device s ports. However if you configure additional port-based VLANs on a Brocade device then each of those VLANs on which STP is enabled and VLAN 1 all run separate spanning trees…
@Nathan
I believe your right too. However can anyone confirm it?
ye,is 813 too diffcult to pass
Hey Guys, wondering what you can make of this:
What will occur when a nonedge switch port is configured for RSTP and doesnt receive a BPDU from its neighbor for three hello timers:
1) RSTP Information will be aged out
2) Port sends a TCN to root bridge
3) The port moves to listening state
4) The port becomes a normal spanning-tree port
I know that RSTP does not detect changes by a link going down, but rather by a blocking port transitioning into the forwarding State. However, a TC message must still be sent out all designated ports. All MAC addresses associated with nonedge ports are flushed.
So im wondering, since the Cisco book doesnt say it sends TC BPDUs out the root port, im wondering if B is really correct.
Any feedback would be greatly appreciated
Regards,
Sarah
@scolpi
As same as you, I did the lab and I get the port priority 128 in Cisco WS-C2960-24TT.
Switch#sh spanning-tree vlan 6
VLAN0006
Spanning tree enabled protocol ieee
Root ID Priority 32774
Address 000D.BDD1.0264
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32774 (priority 32768 sys-id-ext 6)
Address 000D.BDD1.0264
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Fa0/2 Desg FWD 19 16.2 P2p
Fa0/1 Desg FWD 19 128.1 P2p
@Sarah
I understand that RSTP works like STP with some enhancements, so, if no BPDUs are received, the port will jump to a forwarding state. It is then that a TCN would be generated, so, yes, option 2 or B would be correct.
I went over the Foundation Guide, the CCNA LAN book and the Certification Guide and read nothing about info being aged out unless a TCN is received or started.
From the Foundation Guide:
“When an RSTP bridge detects a topology change, it performs the following actions:
1-The RSTP bridge starts the TC While timer with a value equal to twice the hello time for all its nonedge designated ports and its root port, if necessary. The TC While timer is the interval during which the RSTP bridge actively informs the rest of the bridges in the network of a topology change.
2-The RSTP bridge flushes the MAC addresses associated with all nonedge ports.
3-As long as the TC While timer is running on a port, the BPDUs sent out of that port have the TC bit set. While the timer is active, the bridge sends BPDUs even on the root port.
Figure 3.10
”
Further, it states that the BPDUs with the TC bit set are sent out by the originator to the network, even to the root bridge, this is a difference with STP where only the root bridge was the one that sent out BPDUs with the TC bit set.
I have some screenshots of a Test Inside obtained about 1 month ago, if someone has similar data perhaps from a late P4S we could swap ?
tiempo21@hotmail.com
I am planning to take a second try at the 642-813 this coming Friday 24th, so all information is appreciated.
Thanks for the site and input to all !
VLAN0005
Spanning tree enabled protocol ieee
Root ID Priority 32773
Address 108c.cfc0.0900
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32773 (priority 32768 sys-id-ext 5)
Address 108c.cfc0.0900
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Fa0/1 Desg FWD 19 16.2 P2p
Fa0/2 Desg FWD 19 128.3 P2p
VLAN0006
Spanning tree enabled protocol ieee
Root ID Priority 32774
Address 108c.cfc0.0900
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32774 (priority 32768 sys-id-ext 6)
Address 108c.cfc0.0900
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Fa0/1 Desg FWD 19 128.2 P2p
Fa0/2 Desg FWD 19 16.3 P2p
Getting 128 as well on 3560s.
But according to link provided in explanation, default priority is 32.
Further research could be done as to default priorities in different platforms, yet, C and D appear to me to be less controversial.
Therefore the root port for bridge 4 is the one on network segment c….. Therefore the designated port for network segment e is the port that connects bridge 92 to network segment e….. This diagram illustrates all port states as computed by the spanning tree algorithm.
@alejandro.
All d best. And pls after ur test , come nd share ur experience with us.
I got the question1, 2 and 4 in my exam today!!
@Bryan, How did you go on the exam?
“Mixed practices 3 TK—>
Wich configuration option will cause the link between two cisco 3600 become a funcional trunk:
a)switchport dynamic auto
switchport dynamic auto
b)switchport access vlan 10
switchport dynamic desirable
c)switchport mode trunk
switchport no negociate
d)leave both ports with the default trunk settings…
Correct answer B.?¿¿??¿¿? I think the correct answer its D ¡¡¡¡¡
Can anyone confirm this? ”
Correct answer is B – you can test it on packet tracer – it works
– you set access vlan on one switch but you don’t change mode of this port
– default mode for router 3600 with switching module is dynamic auto – not dynamic desirable – so answer D is wrong
=============================
Example:
SW1# show run
interface FastEthernet0/1
switchport access vlan 5
SW1#show int trunk
Port Mode Encapsulation Status Native vlan
Fa0/1 auto n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/1 1-1005
Port Vlans allowed and active in management domain
Fa0/1 1,5
Port Vlans in spanning tree forwarding state and not pruned
Fa0/1 1,5
——————————————-
SW2#
interface FastEthernet0/1
switchport mode dynamic desirable
SW2#show int trunk
Port Mode Encapsulation Status Native vlan
Fa0/1 auto n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/1 1-1005
Port Vlans allowed and active in management domain
Fa0/1 1
Port Vlans in spanning tree forwarding state and not pruned
Fa0/1 1
Kindly guid me for latest update rerding exam, labs, hotspots and tips for successfully pass this exam 642-813. God bless u..
For question 1
http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/configuration/guide/swvlan.html#wp1106281
Priority 32 used only if switch runs CatOS. If we you use IOS on switch, priority always will be 128. From output we can see that we use IOS not CatOS, so priority will be 128.
Answer B,D.
C is not correct because we can’t see SwB config. B,D is more accurate.
Hi guys
I`ll make my exam next week, i want to know how much(generally) of question about wireless and voice appers on the exam ?
Already talked to some people and I was told not appear more than two questions from each topic, this is true?
Thank you
Hello can someone verify question 10 in GOOD.459 VCE file.
Thanks
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Đây là một câu hỏi hơi vô lý. Vì VLAN 107 đã nằm trong VLAN allowed on trunk và VLANs allowed and active in management. Không có lý do nào nó lại bị đẩy khỏi nhóm forwarding state and not pruned. Điều này chỉ xảy ra khi port vlan 107 của SwC hoặc PC chưa được enable.
The answer on question 1 should be B and C in my opinion.
Quesion #5 – wouldn’t udld port [aggressive] solve this issue if the command was on both ends? That way, they would both send UDLD KA’s and would prevent this looping issue from occuring.
Whats true about VTP? 1 or 2?
1. A device in transparent VTP version 1 mode will not forward VTP messages.
2. VTP pruning allows switches to prune VLANs that do not have any active ports associated with them.
A hate when Cisco exams start feeling like english vocabulary exams.
forward= send or forward= relay?
Answer 2 is also badly formulated i guess. VTP will prune VLANs on trunks connected to switches that do not have ports associated with the VLANs. Is this the same as answer 2?
Hi Guys. Just passed the CCNP Switch exam. For EIGRP Lab, I could not get the two host pc’s to Ping the Server. You can’t change the Default gateway or the IP on the host PC’s, you can only modify the configurations on the Switch. I could ping the Server from the Switch, but not from the PC’s.
I gave theSwitch the default gateway of the Router, configured EIGRP on the MLS Switch, still no dice. I had alot of time to burn when I got this Lab. I havd about 40 minutes left, with 5 more questions to go. So I spent about 25 minutes trying to figure out that part out. Eventually I just gave up, as I exhausted all possible explanations and ideas.
So I got a 78% competion rate for that Lab.
Thanks Riddick, good to know. were the access ports to the pc’s assigned to the respective vlans? (it says you cant do any port assignments but if there are no ports assigned to a vlan you can’t get the vlan itself up) i’m going on the exam next tuesday, cross fingers :)
for Q1 , after check link below :
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96a.shtml
32 priority is default to non-cisco IOS (CAT OS) but for IOS ,the default interface priority is 128 so the configuration is shown for Cisco IOS so the default will be 128
so i think the correct answer is B,D
thanks
“Mixed practices 3 TK—>
Wich configuration option will cause the link between two cisco 3600 become a funcional trunk:
a)switchport dynamic auto
switchport dynamic auto
b)switchport access vlan 10
switchport dynamic desirable
c)switchport mode trunk
switchport no negociate
d)leave both ports with the default trunk settings…
Correct answer B.?¿¿??¿¿? I think the correct answer its D ¡¡¡¡¡
According to Cisco, these are the defaults:
Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
The default is access mode.
Catalyst Switches
http://www.cisco.com/en/US/docs/ios/12_2t/inter/command/reference/irftsto.html
The default mode is dependent on the platform; it should be either dynamic auto for platforms that are intended as wiring closets or dynamic desirable for platforms that are intended as backbone switches. The default for PVLAN ports is that no mode is set.
Someone that has already pass the exam: Is this coming and what you chose?
Thanks Irene, That was good piece of information.
@ Irene.
Even I was confused about this question.
But based on the link that you posed, the default setting for switchport mode is access that means in order to negotiate a trunk “choise B.” seems reasonable answer.
Based on what I am understanding is that if both the ports are set to Access mode (by default) then they will not form a trunk.
@Nitai
It is even different in P4S (B) and Nonentity/ActualTest (D) , they have different answers.
Correct answer is C
Have you selected C on real exam?
Guys, i really don’t understand Question 1, Normally Port-priority is the increments of 16, how the port priority is set to 10, and how come there is load balancing if 1 port is in blocking mode ????? I need logical explaination
Question 5: this question is stupid because we don’t use mode access to connect Switches, We actually use Trunk Mode. Wake UP cisco :@
Hey guys, thanks to pass4sure and cert prepare, i passed my Switch 642-813 with
945 points out of 1000points. Preparing to take on next Routing, Good luck to all
preparing 4 the exam.
Labs that came 4 me; aaa dot1x, lacp, eigrp, hsrp.
.
What happens to the member ports of a VLAN when the VLAN is deleted?
@david:the ports will go into inactive state untill it is being used by someother vlan
@david: vlans automatically are assigned to the default vlan (VLAN1).
Johnson,
For Question 5, I think the link will work even in Access mode, but the ports must belong to the same VLAN.
Hi,
Below is a question I have. Answers and opinions appreciated.
When an attacker is using switch spooking to perform VLAN hopping, how is the attacker able to gatherinformation?
A. The attacking station uses DTP to negotiate trunking with a switch port and captures all traffic that is allowed on the trunk
B. The attacking station tags itself with all usable VLANs to capture data that is passed through the switch, regardless of the VLAN to which the data belongs.
C. The attacking station will generate frames with two 802.1Q headers to cause the switch to forward the frames to a VLAN that would be inacessible to the attacker through legitimate means.
D. The attacking station uses VTP to collect VLAN information that is sent out and then tags itself with the domain information in order to capture data.
I think the answer to this question is C, but I may be wrong.
@ Anonymous: I too think that option C is correct since sending two 802.1q headers across a trunk link is also a type of attack.
“Share your SWITCH Experience” has been missing from this site, and now “SWITCH FAQs & Tips” is too. (Left hand corner). Please whats going on?
^it is there. I see it.
Dear no A is corec
I am going to give my CCNP Switch Paper. Please suggest what topics we should more focus on?
Hi Swati,
Did u clear your exam ?
Hi all- took the exam, there were HSRP questions, AAA, (2) Configuring MLS. I saw the question regarding: Management NTP and SLA… I also has the question that is about trunking Something like Domain A, Non-Negotiate and Domain B, Undesireable- will this form a link. I found that if I wrote the scenario down on the provided lamenate paper, it make it a lot easier to go and do the lab (I didn’t have to flip back and forth). For BK above, I think all of the matierial is game. I didn’t happen to have wireless and cos… but that’s exactly what will probably be on the exam if you’re not ready…
@ Anonymous:
I guess you meant “switch spoofing” not spooking. :)
The correct answer is A, because “switch spoofing” is a particular subset of the VLAN Hopping attacks and it does what its names says, it spoofs a switch by negotiating a trunk on a port left in its default VLAN1 and the default DTP state (dynamic auto or desirable, depending on the platform).
@ Sarah: Actually the only answer that seems correct in your question seems to be 1)
I saw a different version of your question where it was asked what would happen if an edge port receives a BPDU. The possible answers were the same.
For that variant indeed the second answer would be the right choice since an edge port which receives a BPDU DOES generate a TCN.
But in the current form it doesn’t make much sense.
@ everybody:
I just can’t fathom how in Q2, VLAN 107 is being pruned by VTP. The only instance where VTP would prune VLAN 107 from Fa0/1 is if it didn’t have any active ports in VLAN 107.
Which would mean that VLAN 107 is not configured on a subinterface of router R1.
Else if R1 has a subinterface with VLAN 107 configured on it and the user PC is connected to an active port of switch SC that belongs to VLAN 107 on switch SC then there is no conceivable reason I can think of, why VTP would prune VLAN 107 on Fa0/1 of SA. It just doesn’t make any sense.
This seems to be yet another half-assed question that wasn’t really thought through and which doesn’t make any sense.
Q1: I don’t understand why everybody talk about port priority (128 vs 32), because in the partial configuration, the port priority is set to “10″, so B(128) is incorrect.
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Question 5, well the answer is correct it is D, because technically if the link between SA and SB is in the same VLAN the traffic will go through without a problem BUT notice that the link is in ACCESS mode, this means no BPDU’s are send and spanning-tree is not going to participate in that link, which means if a HOST attached to SB would send a broadcast than SB would forward that frame to SA and SC, there u go a loop has formed :D, so the answer is correct but the explanation is NOT!
Me
Thanks :D
@anonymous: the mode of an switchport has nothing to do with STP BPDUs. your answer is totally wrong.
BDPUs are send on access-ports and STP is working on that link and, of course, on access ports. the explanation under question 5 is totally correct. better study the STP chapter from an official cert book instead of confusing other people with wrong answers.
i have booked for the 1st of November.
For Q.5 please suggest some information or any URL with details explanation. Thanks !!
Passed this today. Dot1x, MLS(EIGRP) and LACP sims. Couldnt get the Port-channel up in the last one, could be some bogus config left over from the last “company”. Glop2012-06-12 still valid bar a few new ones. Something about a link goes down as 100Mbps but comes back as 10Mbps so how does it effact the STP. Anyway good luck all.
Taking Exams This 31st. Is GLOP & BOOMISH Still valid?? awaiting revert. :-)
RIGHT ANSWERS B AND C
PG. 164 AND 165 OF OFICIAL CERT GUIDE CCNP SWITCH
do not confuse port cost with port priority!!!!!!!!!!!!!!
Q2, Q5 on test today
Guys , In question 1 how can we set port-prioirty to 10 as per official certification guide it should be in increment of 16. If its a CATOS then why this is not covered in official certification guide.
In question 5 , why are we assuming that fa0/6 on SWB is blocked at the first place. i am not happy with the way Cisco asking these questions , In these questions we have to assume something before answering. We should be given output exhibit of the devices.
Q5 on test today