STP Hotspot
Question
Online Incorporated is an internet game provide. The game service network had recently added an additional switch block with multiple VLANs configured. Unfortunately, system administrators neglected to document the spanning-tree topology during configuration. For baseline purpose, you will be required to identify the spanning-tree topology for the switch block. Using the output of “show spanning-tree” command on switch SW-C and the provided physical topology, answer the following questions:
The output of “show spanning-tree” command on SW-C:
Question 1:
Which spanning Tree Protocol has been implemented on SW-B?
A. STP/IEEE 802.1D
B. MSTP/IEEE 802.1s
C. PVST+
D. PVRST
E. None of the above
Answer: C
Explanation:
On the Fa0/2 interface we can see the type of connection is P2p Peer (STP) and Cisco says that: “!— Type P2p Peer(STP) represents that the neighbor switch runs PVST.” Please visit this link to understand more http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a00807b0670.shtml
Question 2:
Which bridge ID belongs to SW-B?
A. 24623.000f.34f5.0138
B. 32768.000d.bd03.0380
C. 32768.000d.65db.0102
D. 32769.000d.65db.0102
E. 32874.000d.db03.0380
F. 32815.000d.db03.0380
Answer: A
Explanation:
Have a look at the output at VLAN0047:
Notice there are two “Cost” value in the picture, the above “Cost” is the total cost from the current switch to the root bridge while the second “Cost” refers to the cost on that interface (Fa0/2). Both these “Cost” are the same so we can deduce that the root bridge is connectly directly to this switch on Fa0/2 interface -> the root bridge is Switch B, and the “Address” field shows its MAC address 000f.34f5.0138. Notice Bridge ID = Bridge Priority + MAC address.
Question 3:
Which port role has interface Fa0/2 of SW-A adopted for VLAN 47?
A. Root port
B. Nondesigned port
C. Designated port
D. Backup port
E. Alternate port
Answer: C
Explanation:
We learned that Switch B is the root bridge for VLAN 47 so port Fa0/1 on SwitchA and Fa0/2 on SwitchC should be the root ports, and from the output of SwitchC, we knew that port Fa0/1 of SwitchC is in blocking state. Therefore its opposite port on SwitchA must be in designated state (forwarding).
So, can Fa0/2 of SW-A be in blocking state? The answer is no so that BPDU packets can be received on Fa0/1 of SW-C. It will remain in blocking state as long as a steady flow of BPDUs is received.
Question 4:
Which port state is interface Fa0/2 of SW-B in for VLANs 1 and 106?
A. Listening
B. Learning
C. Disabled
D. Blocking
E. Forwarding
F. Discarding
Answer: D
Explanation:
As explained in question 2, we can deduce SW-A is the root bridge for VLANs 1 and 106 so ports Fa0/1 on SW-B and SW-C will be the root ports. From the output of SW-C for VLANs 1 and 106, port Fa0/2 of this switch is designated (forwarding) so we can deduce interface Fa0/2 of SW-B is in blocking status.
Question 5:
Which bridge ID belongs to SW-A?
A. 24623.000f.34f5.0138
B. 32768.000d.bd03.0380
C. 32768.000d.65db.0102
D. 32769.000d.65db.0102
E. 32874.000d.db03.0380
F. 32815.000d.db03.0380
Answer: D
Explanation:
SW-A is the root bridge for VLANs 1 and 106 and we can easily find the MAC address of this root bridge from the output of SW-C, it is 000d.65db.0102. Notice that SW-A has 2 bridge IDs for VLANs 1 and 106, they are 32769.000d.65db.0102 and 24682.000d.65db.0102
Official Cert Guide, Page 204.
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
—————- —- —- ——— ——– ——————————-
Gi7/8 Desg FWD 4 128.392 P2p
Gi9/6 Altn BLK 4 128.518 P2p Peer(STP)
Po1 Root FWD 3 128.833 P2p
Po2 Desg FWD 3 128.834 P2p
Po3 Desg FWD 3 128.835 P2p
Switch#
The output in Example 10-1 shows information about the RSTP instance for VLAN 171.
The first shaded line confirms that the local switch indeed is running RSTP. (The only
other way to confirm the STP mode is to locate the spanning-tree mode command in the
running configuration.)
In addition, this output displays all the active ports participating in the VLAN 171 instance
of RSTP, along with their port types. The string P2p denotes a point-to-point RSTP
port type in which a full-duplex link connects two neighboring switches that both are
running RSTP. If you see P2p Peer(STP), the port is a point-to-point type but the neighboring
device is running traditional 802.1D STP.
Thanks
Try this command on a real Cisco switch:
Switch(config)# spanning-tree mode ?
The options will be pvst, mst and rapid-pvst
So 802.1D i.e Common Spanning Tree is only run under pvst. So for Question 1, PVST+ seems like the correct choice, as its is the closest to Common Spanning Tree (802.1D).
@Anonymus
I think it depends what you have running on the switch where you issue the command :
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 4097
Address 001e.bee7.5f80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)
Address 001e.bee7.5f80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Po1 Desg FWD 12 128.56 P2p
Po11 Desg FWD 12 128.136 P2p Peer(STP)
Po12 Desg FWD 12 128.144 P2p Peer(STP)
MST0
Spanning tree enabled protocol mstp
Root ID Priority 32768
Address 001e.bee7.5f80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 001e.bee7.5f80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Po1 Desg FWD 100000 128.56 P2p
Po11 Desg FWD 100000 128.136 P2p Bound(PVST)
Po12 Desg FWD 100000 128.144 P2p Bound(PVST)
Rapid-PVST reports the neighbor as STP (even though it is PVST)
While MST correctly identifies the nieghbor as PVST
“Share your SWITCH Experience” has been missing from this site, and now “SWITCH FAQs & Tips” is too. (Left hand corner). Please whats going on?
hi gys i have completed my switching today 989 …all lab are same 1 eigrp, 2 aaa, 3 lacp as in p4. Also Hsrp, all the best to all of u for your upcoming exam
i had go through cisco press,actual test,9tut, lab of p4s
hi 9TUT.
I need your small favour… will you please suggest a good study book for CCNP (book name with author.) i would really appreciate if you could do this.
Thanks…
Guys, do you get same numbers in the exam like vlan numbers , bridge IDs and etc. ?
Can anyone share VTP Hotspot
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Q1
about this question the Official Certification Guide reports:
”if you see P2p Peer (STP) the port is a point-to-point type but the neighboring device is running traditional 802.1D STP”
this means Answer A is correct
@marco
you are wrong. pvst+ is based on 802.1d (so the certification guide is not wrong at all) but as you can see switch B is running one instance of spanning-tree per vlan otherwise it couldn’t be the root bridge vlan 47 only. therefore pvst+ must be in use and still answer C is correct.
Good explanations, Dairin and test. thanks
@dairin
oh yes, you are right. thanks a lot
Hello 9tut I think the answer to Q4 is A root port. I think there’s been a mistake with here as SWITCH-B cannot very well be the root bridge to VLAN 47 i think its SWITCH-C its clearly reflected on the show mac-address table on Switch-B that its port Fa0/2 is root port for VLAN 47 and as we all know since CCNA that a root bridge does not have any root port in it…
I think that was for Q3 sorry
9tut is the topology for Q4 the one on topmost portion of this page? see it clearly states there that interface Fa0/2 of SW-B is in FWD state and that Switch-D is the root bridge for VLAN 106…
Q4 – Why is the answer not Discarding?
In the output, is shows that all the instances of Spanning Tree are using RSTP. So the states would be Discarding/Learning/Forwarding
Q1: It quotes: “VLAN0001 Spanning Tree enabled protocol rstp”.
Why the answer is not RAPID Spanning-Tree, which means PVRST, therefore answer D ?
Q1 again: http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a00807b0670.shtml
“This output is taken after the mode is changed to rapid-PVST+:
Access1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol rstp”
Is it possible that the answer is ‘E. None of the above’, as rapid-PVST+ is not among the options? What do you think?
Q1 once again:
I think I got it. They are asking for the spanning tree mode implemented on the neighbor. So the answer must be C due to the “P2p Peer(STP)” think. Sorry for all this mess.
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Can anyone tell me how many SIMS were actually on the test? And maybe which ones you had, and what to look for or watch out for?
Have some comments for question Q2, based on the same logic where the costs are equals we can say that the MAC address could a different one. In my opinion something is missing, just don’t know what.
I apologize I was referring at question 2.
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CISCO equipment does not support CST …so the right answer is PVST
Hi Guys,
Seeing the answer right in front your eyes before making selection is annoying. So i grabs all of the questions on this site and put them into VCE file to make my life easier. Be sure to check back CertPrepare site regularly for updates.
Here is the file: http://www.4shared.com/file/C5hmKPbb/CCNP_642-813_CertPrepare-by_Hu.html
Best of luck !!!
Hi All,
Allhamdulillah, I just passed the SWITCH 30minutes ago with 934. SiM out today: LACP with STP Sim, VTP Lab 2, MLS and EIGRP Sim (the one posted by Glop) & HSRP Hotspot. 99.1% questions are same which publish by Glop. 2 down, 1 more to go (TSHOOT).
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Hi all,
Which port role has interface Fa0/2 of SW-A adopted for VLAN 47?
A. Root port
B. Nondesigned port
C. Designated port
D. Backup port
E. Alternate port
In the output you can see that the port role is root and status is designated. and in question it has clearly asked for the role but not status,so why answer A is not correct. clearify me if i am wrong.
@Bikas: Port Fa0/2 of SW-A is connected to Fa0/1 of SW-C. The output in the exhibit is from SW-C…
Thank you!
shudn’t Q 2′s answer be f … coz on VLAN 0047′s output, the Bridge ID section will be sw B’s info wheras the info in Root ID section is root’s info .. I thought tht ws how it worked, any ideas ?
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hi….guys can i one tell me from where can i get latest dumps for CCNP switch exam?
Pass4sure has updated dumps on 4 Sep ….can anyone has these updated questions….i need it…
Ицо, колегите ми разказаха за по-трагичен случай отпреди доста години. Представи си подобна ситуация, само че вместо суичове мрежата е с хъбове. Тогава зациклянето се получило не само заради broadcast заявки ами дори при обикновни uincast пакети. По стечение на обстоятелствата мрежата освен за трафик към клиенти е била използвана и за управление (management) сървърите и на самите мрежови устройства, та можеш да си представиш каква паника е настанало като не само не са могли да разберат какво става, ами откъде идва. Пробвали да махнат loop-a ама проблема не се решил заради буферираните пакети. Проблема се оправил чак когато спрели всичките мрежови устройства. Всичките няколко стотин
pls. write in english only
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Hi Guys, I just finished my CCNA and would like to proceed with CCNP. I was wondering in which order should I start preparing? Switching Routing and Troubleshooting? Should I be taking the exams in the same order was well? Please suggest?
start with route
Taking this one today.
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Anybody has latest dumbs? I have heard that format is changed. Is it true?
dont tell me that format has changed? im taking my test tomorrow :(
any idea dumps are changed or not???
dears,
in Q1 asking about switch B run default as per cisco press PVST+ , switch C and A run RSTP,
explenation spanning tree enable protocol o switch c is RSTP, and realtion ship of its port with other switch P2P that is mean run the same rstp as switch A or P2P peer (STP) a point-to-point type but the neighboring device is running traditional 802.1D STP.
other
Someone can share a valid link to download packet tracer 5.3.3 ?
@corazon. This is from mark. Posted in labsim comments section.
https://www.dropbox.com/s/4pa108fx4pci2j8/PacketTracer533_setup_no_tutorials.exe
Can someone help me with E-book materials for CCNP? I want to prepare and write the exam this year. I already pass CCNA last year. Plsss help.
Can someone please share the latest 642-813 dumps, i am palnning to give exam this weekend.
my email id is sphadke2@gmail.com
Q5: If 24682.000d.65db.0102 were an option and 32769.000d.65db.0102 too, What would be the correct answer?, 24682.000d.65db.0102 because has a lower bridge id?.
Thanks in advance
pls can someone send me vce testing software. or where can i download it! am having trouble in using the vce files i have. thanks.. cisco.valentine@yahoo.com
welcome
how do you practice your lab activities? some commands not running in GNS3 and PT. I think the nly way to practice these commands is to buy or borrow some 3550/60 and 2550/60 switches.
@hungn
do you have vce from the route on http://www.digitaltut.com/ site created as well
Please can someone verify 642-813 is still valid?
hello…does anyone has the latest dump files for CCNP switch? Please email to me at hung.ng.n@gmail.com
does any one got this hotspot in exam???
@AA – Looks like it – http://lmgtfy.com/?q=is+cisco+642-813+still+valid&l=1
Really, some people just don’t deserve to pass this exam!
Hi guys! About Q5. There are not specified for which VLAN we should tell Bridge ID, so why correct is 32769?
I think answer C is more correct, because we have default Bridge ID there.
Answer D is correct for Q5.
The bridge ID = the Bridge priority + MAC
In this case it is 32769.000d.65db.0102 or 24682.000d.65db.0102. The only choice provided was 32769.000d.65db.0102.