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IPv6 Questions

October 23rd, 2010 in CCIE Written Go to comments

Here you will find answer to IPv6 Questions

Question 1

Which of these statements best describes the major difference between an IPv4-compatible tunnel and a 6to4 tunnel?

A. An IPv4-compatible tunnel is a static tunnel, but an 6to4 tunnel is a semiautomatic tunnel.
B. The deployment of a IPv4-compatible tunnel requires a special code on the edge routers, but a 6to4 tunnel does not require any special code.
C. An IPv4-compatible tunnel is typically used only between two IPv6 domains, but a 6to4 tunnel is used to connect two or more IPv6 domains.
D. For an IPv4-compatible tunnel, the ISP assigns only IPv4 addresses for each domain, but for a 6to4 tunnel, the ISP assigns only IPv6 addresses for each domain.

Answer: C

Question 2

Which IPv6 address would you ping to determine if OSPFv3 is able to send and receive unicast packets across a link?

A. anycast address
B. site-local multicast
C. global address of the link
D. unique local address
E. link-local address

Answer: E

Question 3

You are using IPv6, and would like to configure EIGRPv3. Which three of these correctly describe how you can perform this configuration? (Choose three)

A. EIGRP for IPv6 is directly configured on the interfaces over which it runs.
B. EIGRP for IPv6 is not configured on the interfaces over which it runs, but if a user uses passive-interface configuration, EIGRP for IPv6 needs to be configured on the interface that is made passive.
C. There is a network statement configuration in EIGRP for IPv6, the same as for IPv4.
D. There is no network statement configuration in EIGRP for IPv6.
E. When a user uses a passive-interface configuration, EIGRP for IPv6 does not need to be configured on the interface that is made passive.
F. When a user uses a non-passive-interface configuration, EIGRP for IPv6 does not need to be configured on the interface that is made passive

Answer: A D E

Question 4

Which of these statements accurately identifies how Unicast Reverse Path Forwarding can be employed to prevent the use of malformed or forged IP sources addresses?

A.    It is applied only on the input interface of a router.
B.    If is applied only on the output interface of a router.
C.    It can be configured either on the input or output interface of a router.
D.    It cannot be configured on a router interface.
E.    It is configured under any routing protocol process.

Answer: A

Question 5

Unicast Reverse Path Forwarding can perform all of these actions except which one?

A. examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received 
B. check to see if any packet received at a router interface arrives on the best return path
C. combine with a configured ACL
D. log its events, if you specify the logging options for the ACL entries used by the unicast rpf command
E. inspect IP packets encapsulated in tunnels, such as GRE

Answer: E

Question 6

During the IPv6 address resolution, a node sends a neighbor solicitation message in order to discover which of these?

A. The Layer 2 multicast address of the destination node
B. The solicited node multicast address of the destination node
C. The Layer 2 address of the destination node based on the destination IPv6 address
D. The IPv6 address of the destination node based on the destination Layer 2 address

Answer: C

Question 7

When using IP SLA FTP operation, which two FTP modes are supported? (Choose two)

A. Only the FTP PUT operation type is supported.
B. Active mode is supported.
C. Passive FTP transfer modes are supported.
D. FTP URL specified for the FTP GET operation is not supported.

Answer: B C

  1. Anonymous
    May 3rd, 2011

    Can someone please explain Unicast Reverse Path Forwarding.

  2. Riaz
    May 5th, 2011

    Unicast Reverse Path Forwarding:

    Is a small security feature, when configured on an interface, the router checks the incoming packet’s source address with its routing table. If the incoming packet’s source is reachable via the same interface it was received, the packet is allowed. URPF provides protection again spoofed packets with unverifiable source.


  3. henk
    July 3rd, 2011

    Why is Question 3 answer E “When a user uses a passive-interface configuration, EIGRP for IPv6 does not need to be configured on the interface that is made passive” correct? If you do not configure EIGRP on the interface, the networks of this interface will not be advertised. I do not think answer E is correct.

  4. sss
    August 1st, 2011

    Why is Question 1 answer C correct? Isn’t it answer “A” ?

  5. Anon192168
    August 5th, 2011

    Again when taking these look for keywords to be off, eliminate “wrong” answers and look at what is left.
    Q1: Answer A is wrong because it’s considered an automatic tunnel, not semi-automatic Answer B is wrong because special code is not needed. This leaves C and D. D isn’t really correct, because they need to assign ipv6 and ipV4 addresses to one end of the tunnel. This leaves answer C which is correct, “6to4 tunnel is used to connect two or more IPv6 domains.” is a correct statement.
    Source is the IPV6 fundamentals course.
    Q2: IPV6 uses the link-local addresses for neighbor adjacencies. I.E. the adjacencies are build off this address FF80::/10. Answer E is the only one. Answer A, OSPF doesn’t use anycast for any reason, wrong answer. Answer B, The site local multicast FF02::5, FF02::6 will be used to send LSA’s on much like and, its nice IPv6 uses the same host with these multicast addresses! But its not the address you would ping to test the adjacency. The Global and unique addresses are not used either.
    Q3: is just misleading and a bad question. In IPv6 the network statement is gone, and IPV6 is enabled on the interfaces. So why anyone would through passive in there is just misleading.
    EIGRP config
    Ipv6 router eigrp as-number
    no shut
    Config-if commands
    Ipv6 eigrp as-number
    Therefore A is true, B is incorrect it is configured on the interface, C is incorrect no network statements, and thus D is true. E is true and misleading, but still true. F is incorrect because of the wording, non-passive is a regular interface and the config-if commands will be needed.
    Q4: The command is looking for spoofed addresses so it has to be applied inbound and on the interface. A is ture, B is false, it cannot be used on output, C is false. It has to be on the interface D is false and E is also false it does not apply to the routing process.

  6. Anon192168
    August 5th, 2011

    Q5. This function is cannot be used to inspect GRE and other tunnels…E is the only correct answer.
    Q6. There are no ARPs in IPv6, this is down by Neighbor solicitation using ICMPv3. Neighbor solicitation provides the same function as ARP did, Mapping A layer three address to a Layer two address. In this case C is correct.
    ICMPv3 port 133 fro Router solicitations
    ICMPv3 port 134 for Router advertisements
    ICMPv3 port 135 for Neighbor solicitations
    ICMPv3 port 136 for Neighbor advertisements

  7. Anon192168
    August 5th, 2011

    Q7. The answer is talking about FTP modes. The GET and the PUT are FTP operations and not FTP modes. That eliminates two answers. Plus a FTP server that cannot put or get wouldn’t be much good if you think about it.

  8. ipexpert
    September 11th, 2011

    Q7. IP SLA FTP Operation: only GET requests are supported, modes – both passive and active are supported.
    A,D wrong
    B,C correct
    more details here:

  9. Essy
    October 16th, 2011

    Thanks for sharing. Always good to find a real eprxet.

  10. Ullah
    December 31st, 2011

    Can any one tell me how many questions in written CCIE and is there any LAB in CCIE written?

  11. CiscoGuyUSA
    January 16th, 2012

    Q2- just a bit more detail on why the correct answer is link-local. Per RFC 2740, section 2.5-

    “On all OSPF interfaces except virtual links, OSPF packets are sent using the interface’s associated link-local unicast address as source.”

  12. CCIE_TO-BE
    January 23rd, 2012

    It would have been nice to have an explanation for each answer like the one for “IP Services”. Anyone taking the challenge?

  13. HST
    April 9th, 2012

    what is the first thing that happens when IPv6 is enabled on an interface on a host

    a) A router solicitation is sent on that interface
    b) there is a duplicate address detection on the host interface
    c) the link local address is assigned n the host interface
    d) a neighbor redirect message is sent on the host interface

    as per pass4sure the correct answer is B

    i wonder if this is correct? i havent found this question in this site :S

  14. ND
    April 16th, 2012

    Duplicate address detection is performed first on a new, link-local IPv6 address before the address is assigned to an interface (the new address remains in a tentative state while duplicate address detection is performed).



  15. Sagar
    June 12th, 2012

    What does a unicast prefix-based IPv6 multicast address start with?
    aA. FF80
    B. FF3
    C. FF
    D. FF7
    please tell me the correct ans. thanks

  16. Otto
    June 23rd, 2012

    @Sagar: It seems to my they are talking about the solicited multicast address which is derived from the last 24 bits of the unicast address added to the prefix FF02:0:0:0:0:1:FF00/104. In this case I would choose C.

  17. El
    July 14th, 2012

    If you search vor unicast prefix-based IPv6 multicast address you will find many links point to RFC 3306 which say this is FF3.

    See as well

  18. billigstrom
    May 25th, 2013

    Great site post.
    Do you do blogroll exchanging?

  19. Dinesh kumar
    June 18th, 2013

    @anon192168, Thanks lot for well explanation we expecting your explanation all topic as well….

  20. skywalker
    December 10th, 2013

    Q: What does unicast prefix-based IPv6 multicast address start with?

    Answer: FF.

  21. sami
    April 25th, 2014

    hi all
    subscribe to that channel http://www.youtube.com/user/Joynetworks for free


  22. Ozzy
    July 7th, 2014

    Per RFC-4291 statement. The IPv6 multicast addresses use the range FF00::/8. Which is the left 8 bits are set to 1. The remaining 9th to 12nd bits are reserved for flags (so called 0,R,P,T). P=1 means that multicast address is derived from unicast address. T=1 means that multicast address if a temporary address. For P=1, T have set to 1. And that will result a unicast prefix-based IPv6 multicast address starts with 1111 1111 0011 in binary format (the hexadecimal FF3X::/12). So the correct answer for unicast prefix-based IPv6 multicast address quiz is FF3.

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