its fine that the mac address of sw3 is lower so one of the port of sw4 should be blocked.
bt i m confused which port index no should be referred? of sw3 or sw4 ?

they said index no of sending bridge i.e. sw3. i dint knw that. i have been taught to choose blocking port just by seeing index no of sw 4. i.e. f0/11 is higher thn f0/2 so f0/11 should be blocked.
is this theory correct ? pls help me out.

A is correct because RSTP consolidate port states into 3 states: Discarding, Learning, Forwarding – you can read about it here: http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

F is NOT correct because RSTP in Cisco’s routers are actually a modified version that support PER VLAN RSTP. You can try it in Packet Tracer.

do you use a quick trick/astuce to do this 9tut? Please let me know I am taking the exam on friday.

Thank you all

If port fa0/1 on Switch3 was connected with port fa0/11 (instead of fa0/2) on Switch4, then the port put on discarding status would be fa0/2 on Switch4???!!!

I think…yes…!!! Right???

“Switch 3 has a lower bridge ID than Switch 4 (because the MAC of Switch3 is smaller than that of Switch4) so both ports of Switch3 will be in forwarding state. The alternative port will surely belong to Switch4.”

I think this is wrong. What if Switch4 has lower MAC address, then will STP make two ports in switch4 as designated and block one of ports in switch3?

I think, switch3 ports will be desginated because for two segments between switch 3 and 4, the path cost to root is shorter from switch 3, that’s why it will make ports of switch3 as DP.
If switch4 has lower MAC address, this STP port selection doesn’t change.

So, going back to question assuming switch4 has lower MAC address than switch3, if 9tut explanation is true,
Switch4 port 2 will be root, 11 will be designated.
Switch3 port 1 will be designated, 12 will be blocked and alternate.

But if we only look at cost from segments to root, the answer stays the same.

Please correct me if I’m wrong.

And the “F” implies that This switch is root bridge for the vlans in its switch and it is wrong.

This Switch must be Root Bridge for all the VLANs in all the other switches in the domain.

So “A” Might be correct.
PLease correct me, if i am wrong

=== SwitchA is currently not root bridge ====
SwitchA#show spanning-tree vlan 30

VLAN0030
Spanning tree enabled protocol rstp
Root ID Priority 32798
Address 0019.e7db.d100
Cost 4
Port 25 (GigabitEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32798 (priority 32768 sys-id-ext 30)
Address 0023.ea8d.cd00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Gi0/1 Root FWD 4 128.25 P2p
Gi0/2 Altn BLK 4 128.26 P2p

=== Let’s make SwitchA root bridge for vlan 30 ===
SwitchA#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SwitchA(config)#spanning-tree vlan 30 priority 24576
SwitchA(config)#end
SwitchA#
*Mar 1 00:16:00.579: %SYS-5-CONFIG_I: Configured from console by console
SwitchA#show spanning-tree vlan 30

VLAN0030
Spanning tree enabled protocol rstp
Root ID Priority 24606
Address 0023.ea8d.cd00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24606 (priority 24576 sys-id-ext 30)
Address 0023.ea8d.cd00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Gi0/1 Desg FWD 4 128.25 P2p
Gi0/2 Desg FWD 4 128.26 P2p

=== SwitchA now root for vlan 30, but not for other vlan that was left on default ===
SwitchA#show spanning-tree vlan 2

VLAN0002
Spanning tree enabled protocol rstp
Root ID Priority 32770
Address 0019.e7db.d100
Cost 4
Port 25 (GigabitEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)
Address 0023.ea8d.cd00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
——————- —- — ——— ——– ——————————–
Gi0/1 Root FWD 4 128.25 P2p
Gi0/2 Altn BLK 4 128.26 P2p

Question 5 on the 9tut.com the answer are A C E

but on the exam collection spike the answer are C E F

witch is correct one URGENT Please ??????/
my exam
next week

Question 5 on the 9tut.com the answer are A C E

but on the exam collection spike the answer are C E F

witch is correct one URGENT Please ??????/

tomorrow is my exam

About questionon F need to explain shortly that if you use command ” SHOW SPANNING-TREE ” on SWITCH then you would see the result about all current VLAN situation which is not show in this question totally.

A – All ports will be in a state of discarding, learning or forwarding.it’s a general sentence about RSTP (Rapid STP – listening, blocking is eliminated)

F – How we know that the switch is root switch for all vlans ?

witch is correct one URGENT Please

Here, “rstp” means, it runs the “Per Vlan Rapid Spanning Tree”

F. The switch must be the root bridge for all VLANs on this switch.

With PVRST, you can control the root assignment to a Switch as you wish for each VLAN with the below commands

Switch (config)# spanning-tree vlan 1 root primary
Switch (config)# spanning-tree vlan 1 priority 4096 ; lower value

A. All ports will be in a state of discarding, learning or forwarding.
F. The switch must be the root bridge for all VLANs on this switch.

We are dealing with the situation under VLAN 30 here.

In general for RSTP “A” is correct but since we are dealing with VLAN 30 this is wrong.

Now if we look at “F”, since the Priority is lower than the default (correct answer “C”), we might assume that this “must be” the root bridge for all VLANs.

If “F” is rephrased to (The switch “is” the root bridge for all VLANs on this switch) then this would be wrong.

This one is a bit tricky, for this is only my analysis of the situation. I am open to all ideas for we might encounter this kind of situation in the exam.

Feel free to comment for we all benefit for any information shared.

Thanks!

VALID Q
Q#9

Q:3
Q:9

Today I have passed the CCNA. (860/825)
50 questions 3 labs (VTP, EIGRP, ACL). 35 from 9tut.

Also thanks a lot Brar and Sekhar (still valid from examcollection)

Ty again 9tut

from here Q 4, 8

@9tut :

I do agree with my fellows about question 5.
“F. The switch must be the root bridge for all VLANs on this switch” should be a correct answer since we are on RSTP and not on PVST.

What do you think ?

Also since the given switch is the root bridge all its ports will be designated which in turn will only be in forwarding state. So option A is wrong. Option F is correct.

pls..explain

You are mixing port roles & port states, so port state will be only discarding, learning or forwarding (discarding merges blocking, listening & disabled from STP).
Port roles are root, designated, alternate or backup (alt. and backup replaced blocking)

can you pls explain q13 why switch 3 GI0/2 cannot be in discarding role.

Pls help thanks.

However, the output indicates that the protocol is “rstp.” Correct me if I am wrong, but doesn’t rstp define additional port roles of “alternate and backup?”

So shouldn’t A- read: All ports will be in a state of discarding, learning, forwarding, alternate, and backup?

C is correct, but a side note; There could be a successful DTP completion *WITHOUT* 801.1Q (trunking) is used.

dynamic auto – the port will negotiate the mode automatically, however, it prefers to be an access port
dynamic desirable – the port will negotiate the mode automatically, however, it prefers to be a trunk port

Hence:
dynamic auto + dynamic auto = access
dynamic auto + dynamic desirable = trunk
dynamic desirable + dynamic desirable = trunk
dynamic auto or dynamic desirable + trunk = trunk
dynamic auto or dynamic desirable + access = access

https://supportforums.cisco.com/thread/2000727

The switch must be the root bridge for all vlans in the Local network…else f is implying that PER VLAN stp is being used.

ABOUT MY EXAM:
I had total of 50 questions….
Had three simulations….ACL2, same as here at 9tut but modified as the third table of modifications above and i was dealing with host B plus different IP addresses, EIGRP almost the same as here, had to change the AS in router Home 2 from somethng 21 to 221 and add the appropriate networks also i had to delete and add some networks from router Home 1 (central router) and finaly the VTP…same as here just different question to follow the same procedures in resolving
NB: i ddnt see anythng that i had not come across before

for any other enquiries find me at ropamson@gmail.com …..best of luck for everybody working on CCNA

could you please explain this question:
Which two data link protocols are supported by cisco ios software for IPv6?

A.Frame Relay
B.PPPv6
C.HLDCP
D.ATM
E.FDDI
F.MPLS/6PE

Answer: A and C

in q13 in explanation it is said that “fa0/12 is inferior to fa0/1″ can anyone plz tell me how..???

in q1 why can’t the ans be D E F

in q13 what are “port index” and “Port values” can we configure them manually if yes, how?

plz help me I hv my xm in few days………tnx in advance

Answer:A and C

Can any one please explain why A and E are answers. I find below article but I dont know is reliable or not. (http://ipv6int.net/systems/cisco_ios_router-ipv6.html)

Cisco IOS supports a variety of IPv6 over data link layers, including:
Ethernet (Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet)
Frame Relay
PPPv6
HLDCP
ATM
FDDI
MPLS/6PE

i believe, the question in your images differs from the question, where B is the right answer ;-)

take a look:

http://tinypic.com/r/2ros313/6

in my image, B is the correct answer, because they ask for SOME redundany to increase reliabiliy. in your image they ask for MAXIMUM RELIABILITY.

hope, i’m right and helped you.

in shekhar dumps ans. is C but ..in other dumps i see answer is B …so can anyone tell me whta is the exact ans. n y ???
thnx in advance :) :)

Q11. Which port state is introduced by Rapid-PVST?

Frank T