IPv6 Questions 3

is ques 6 right?
ithink the ans should be “a”

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@suddhshil search for the command on this page http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-ospf.html

To suddhoshil: Quest 6 is right. There are test banks that state that the answer is “A” and the test banks are incorrect. I looked up the answer on the Cisco Web site:

“When the process keyword is used with the clear ipv6 ospf command, the OSPFv3 database is cleared and repopulated, and then the SPF algorithm is performed.”

http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-ospf.html

@ALL

R1#show ipv6 neighbor

IPv6 Address Age Link-layer Addr State Interface

FE80::21E:79FF:FEAB:3141 2 001e.79ab.3141 STALE Gi0/1

Which statement about this neighbor of R1 is true? Select the best response.

A – OSPFv3 adjacency has been lost, which causes the neighbor to be considered Stale.
B – Aggregate global addresses are always used between IPv6 neighbors.
C – OSPFv3 adjacency will not work between link-local addresses.
D – R1 used ICMP to learn about this neighbor

Isn’t IPv6 only compatible with neighbor discovery protocol (NDP) and NOT ICMP ????

@man

NDP is an umbrella protocol that actually uses 5 types of ICMPv6 packets:
- router solicitation
- router advertisement
- neighbor solicitation
- neighbor advertisement
- redirect message

Hope that helps.

Don’t mix ICMP with ARP,

ARP ‘address resolution protocol” is for IPv4
NDP ‘neighbor discovery protocol” is for IPv6

ICMP is the ping echo

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for Quatation # 5

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Could someone pl explain this in Q1. I don’t understand what is meant about short address; how would it be permitted to assign like that?

“Note: The reason for inverting the “U/L” bit is to allow ignoring it for short values in the manual configuration case. For example, you can manually assign the short address fc80::1 instead of the long fc80:0:0:0:0200::1.”

Did he mean FE80:0:200::1 ?

How many questions are coming from ipv6 ?

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I just started to study the ROUTE test after taking almost two years off from passing the CCNA. I am planning to take the ROUTE test in two months. Are the Sims, Drag and Drop, Questions, and everything else on this site still valid for the ROUTE test?

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the seventh bit in an ipv6 interface identifier is referred to as the Universal/Local (U/L) bit. reference book Implementing Cisco IP Routing (ROUTE) Diane Teare page 702

Q7 an dQ9 looks like inconsistent but why not do the same with different commands

yes U/L bit is the seventh no sixth in ipv6 address !

how many questions r on Ipv6?Is there any new quest othere than this?

Question 9: Which command enables OSPF for IPv6 on a router? Shouldn’t the answer be D, “ipv6 ospf process-id area-id”, which is executed under an interface. This command is what enables OSPFv3. Doing the command “ipv6 router ospf process-id” goes under the process in order to do some configuration only, but not to enable it. If you were to execute this command first, it wouldn’t work until you configure one of the interfaces in an area. Right?

doubt about Q4, a RS will trigger a RA that will advertise the global prefix that enable the node to to build its global ip address of the node. so B might be correct.

i agree with Alaa…Q7 and Q9 are contraditing with each other ..see the comment under Q9 it says command should be used in global config mode whereas in Q7 , it says option B which is interface level.
Please comment

@alaa

The question mentioned that ipv6 should be enabled on the existing router which is running ospf… so it would be definitely ospfv2 where ipv6 is enabled in global mode. Option D would have been correct if ospfv3 was to be enabled.

for question number 8, it should be

E. Intra-area prefix LSA right?

Is Question 8 from an actual certification test??? The OFFICIAL Certification Guide for this very test only sais that type 9 is “Opaque”.

This is the very reason I use sites like this one – how the hell are we supposed to learn stuff when it’s not even included in Cisco’s own training material?!

Same thing about Question 3: The official guide never mentions that IPv6 prefixes have a lifetime. Bah!

And again, Question 6, not a single word about this in the Official Certification Guide.

As for Q7 and Q9:

ipv6 router ospf process-id enables OSPFv3 on the ROUTER.

ipv6 ospf process-id area area-id enables OSPFv3 on the INTERFACE.

So Q7=B and Q9=A

(Also note that in Q9 answer D has the wrong syntax.)

In the explanation for Question 1, the U/L bit is mentioned as the 6th bit in the MAC. It is actually the 7th bit.

That’s why 0012 becomes 0212:

0×0012 = 0000 0000 0001 0010

0×0212 = 0000 0010 0001 0010

Swede, the explanation says start counting from zero, and you start counting from bit 1. So both explanations are correct.

HEY ANYBODY COULD YOU PLEASE LET ME KNOW WHY THESE QUESTIONS ARE NOT DISCUSSED IN DIGITALTUT ????? :—-

http://www.aiotestking.com/cisco/2011/09/what-did-the-tac-engineer-configure-incorrectly/
it is about crypto questions of IPSEC TUNNEL

QUESTIONS 84, 85 , 86 FROM WHEEL MAN DUMPS …..
I m having a real hard time understanding these questions….. pls anybody help !!!

also, has anybody recently given route exam faced these questions regarding crypto ipsec ??

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I think Q6 is wrong. The answer should be letter A.

I did a lab in GNS3, output after did the command: (the neighbor go FULL to DOWN and after go DOWN to FULL)

R2#clear ipv6 ospf 1 process
Reset OSPF process? [no]: yes
R2#
*Mar 1 00:06:06.139: %OSPFv3-5-ADJCHG: Process 1, Nbr 1.1.1.1 on FastEthernet0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Mar 1 00:06:06.163: %OSPFv3-5-ADJCHG: Process 1, Nbr 1.1.1.1 on FastEthernet0/0 from LOADING to FULL, Loading Done
R2#

In IPv6, the interfaces running OSPF can be configured with multiple address prefixes. Which statement is true about the IPv6 addresses that can be included into the OSPF process?

Select the best response.

A. Specific addresses cannot be selected for importation into the OSPF process.
B. Specific addresses can be selected using an ACL.
C. Specific addresses can be selected using a route map.
D. Specific addresses can be selected using a prefix list.

Ans given: A

Can someone help to explain this? Thanks.

Question 6 is correct.

The *MAIN* act taking place during a clear ip ospf process command is the forcing of an SPF calculation.

No crap the neighbors go down and up, cuz you are bouncing the whole process. You need to find the BEST answer.

@DK
I think that A is correct because in OSPFv3 you cannot use “network command” to match interfaces where you want to run ospf on (like you can do in OSPFv2).
In OSPFv3 you have to go under the interface and type “ipv6 ospf area ”
(this also confirms that Swede’s comment about Q9′s answer D is true => answer D has wrong sintax)

@DK
I think that A is correct because in OSPFv3 you cannot use “network command” to match interfaces where you want to run ospf on (like you can do in OSPFv2).
In OSPFv3 you have to go under the interface and type “ipv6 ospf area ”
(this also confirms that Swede’s comment about Q9′s answer D is true => answer D has wrong sintax)

sorry for all reposts
What I ment is that ospfv3 correct sintax is “ipv6 ospf area “

MMI, no. Syntax is ipv6 ospf PROCESS-ID area AREA-ID.

for #9
R1(config)#int f0/0
R1(config-if)#no shut
R1(config-if)#ip add 1.1.1.1
*Mar 1 00:00:39.667: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar 1 00:00:40.667: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#router ospf 1
R1(config-router)#net 1.1.1.0 0.0.0.255 a 0
R1(config-router)#do sh cdp n
Capability Codes: R – Router, T – Trans Bridge, B – Source Route Bridge
S – Switch, H – Host, I – IGMP, r – Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID
R2.lab.local Fas 0/0 139 R S I 2691 Fas 0/0
R1(config-router)#do sh ip o n

Neighbor ID Pri State Dead Time Address Interface
1.1.1.2 1 EXSTART/DR 00:00:38 1.1.1.2 FastEthernet0/0
R1(config-router)#
*Mar 1 00:03:01.331: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.2 on FastEthernet0/0 from LOADING to FULL, Loading Done
R1(config-router)#int f0/0
R1(config-if)#ipv6 add 2001::1/64
R1(config-if)#ipv6 unicast
R1(config)#int f0/0
R1(config-if)#ipv6 ospf 1 are 0
R1(config-if)#do sh ip
*Mar 1 00:06:26.023: %OSPFv3-5-ADJCHG: Process 1, Nbr 1.1.1.2 on FastEthernet0/0 from LOADING to FULL, Loading Done
R1(config-if)#do sh ipv6 ospf
Routing Process “ospfv3 1″ with ID 1.1.1.1
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0×000000
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Reference bandwidth unit is 100 mbps
Area BACKBONE(0)
Number of interfaces in this area is 1
SPF algorithm executed 2 times
Number of LSA 6. Checksum Sum 0x01B587
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0

Thus question 9 is E.
ipv6 ospf (PROCESS ID) area (AREA NUMBER)

Same applies to 6 i suppose, sorry for spam

how ever
R4#config t
Enter configuration commands, one per line. End with CNTL/Z.
R4(config)#ipv6 uni
R4(config)#ipv6 router ospf 1
R4(config-rtr)#do sh ipv6 ospf
Routing Process “ospfv3 1″ with ID 172.16.100.1
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0×000000
Number of areas in this router is 0. 0 normal 0 stub 0 nssa
Reference bandwidth unit is 100 mbps

so if i were to test running both these now, id pick A, because D is bad and A does too

Question 1

Answer “MAC address” is not correct for Windows Vista and Windows 7/8 operating systems. They generate random hostID part of address by default. Though this can be changed with:

netsh interface ipv6 set privacy state=disabled store=active
netsh interface ipv6 set privacy state=disabled store=persistent
netsh interface ipv6 set global randomizeidentifiers=disabled store=active
netsh interface ipv6 set global randomizeidentifiers=disabled store=persistent

@DK

From Cisco- it’s talking about which v6 addresses on an interface are imported into OSPF when you use the interface command:

“In IPv6, users can configure many address prefixes on an interface. In OSPFv3, all address prefixes on an interface are included by default. Users cannot select some address prefixes to be imported into OSPFv3; either all address prefixes on an interface are imported, or no address prefixes on an interface are imported.”

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I would like to explain about Question 9 a little. Its answer is not for interface subcommand.
It is a command to enter ipv6 ospf router configuration mode .It is used to configure vitrual link,stub,NSSA,etc.So , you don’t need to confuse about this answer.The question asks to setting up ospf in ipv6 router, not to enable ospfv3 on the interface.

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