642-902 Q&A – Implement an IPv6 based solution (21-25)

Section 4 – Implement an IPv6 based solution, given a network design and a set of requirements

QUESTION NO: 21
Which functionality is required within an IP router that is situated at the boundary of an IPv4 network and an IPv6 network to allow communication between IPv6-only and IPv4-only nodes? Select the best response.
A. Autoconfiguration
B. Automatic 6to4 Tunnel
C. Automatic 6to4 Relay
D. Network Address Translator-Protocol Translator (NAT-PT) E. Intrasite Automatic Tunnel Address Protocol (ISATAP)
Answer: D

Explanation:
A manually configured tunnel explicitly defines the destination IPv4 address, as does a GRE IPv6 tunnel. The other two types listed in the answer do not. Additionally, a manually configured tunnel uses mode ipv6ip , whereas GRE tunnels use mode gre.

QUESTION NO: 22
Refer to the exhibit. Which interoperability technique implemented on the dual-stack routers would allow connectivity between IPv6 sites across automatic created tunnels using the 2002::/16 prefix? Select the best response.

22
A. Dual Stack
B. NAT-PT
C. 6to4 tunnel
D. GRE tunnel
E. ISATAP tunnel
Answer: C

QUESTION NO: 23
Which IPv6 address correctly compresses the IPv6 unicast address 2001:0:0:0:0DB8:0:0:417A? Select the best response.
A. 2001:0DB8:417A
B. 2001::0DB8::417A C. 2001:::0DB8::417A
D. 2001:0DB8:0:0:417A
E. 2001::DB8:0:0:417A
F. 2001:::0DB8:0:0:417A
Answer: E
Explanation:
The point of this question is the about the different form of Ipv6 address.
The IPv6 address is 128 bits long, written as eight 16-bit pieces, separated by colons. Each piece is represented by four hexadecimal digits. You can compact multiple contiguous fields of zero even further. This is the exception to the rule that at least one digit must be present in every field.
You can replace multiple fields of zeros with double colons (::).
Note that :: can replace only one set of contiguous zero fields. Multiple ::s would make the address ambiguous.

QUESTION NO: 24
Refer to the exhibit. Which statement about this neighbor of R1 is true? Select the best response.

24
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.
Answer: D

QUESTION NO: 25
Refer to the exhibit. The 6to4 overlay tunnel configuration has been applied on each router to join isolated IPv6 networks over a IPv4 network. Which statements regarding the 6to4 overlay tunnel is true?

21
A. The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 Tunnel0 command will correspond to the interface E0/0 IPv4 address.
B. The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 .Tunnel0 command will correspond to the IPv4 address assigned to the  tunnel source.
C. The configuration is invalid since the tunnel source command must be configured with an IPv6 address.
D. This is actually a configuration example of an IPv4-compatible tunnel and not a 6to4 tunnel.
E. This is actually a configuration example of an ISATAP overlay tunnel and not a 6to4 tunnel.
Answer: B

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