IPv6 Questions 4
Here you will find answers to IPv6 questions – part 4
Question 1
Which IPv4-mapped IPv6 address is equivalent to IPv6 address ::ffff:AC11:AC11?
A. ::ffff:10.12.10.12
B. ::ffff:10.14.10.14
C. ::ffff:44.49.44.49
D. ::ffff:161.193.161.193
E. ::ffff:172.17.172.17
F. ::ffff:193.11.193.11
Answer: E
Explanation
The IPv4-mapped IPv6 addresses are regular IPv4 addresses that have been mapped into the IPv6 address space. The range of this kind of IP address is 0:0:0:0:0:FFFF/96 (or ::FFFF/96). They have a set of 16 ones after the initial string of 80 zeroes, and then the IPv4 address. For example, if an IPv4 device has the address 172.17.172.17, it would be represented as 0:0:0:0:0:FFFF:172.17.172.17, or ::FFFF:172.17.172.17. To convert this address to IPv6 address, just write the IPv4 part in binary form and convert a group of four bits into a hexadecimal digit. For example: 172 = 1010 1100 = AC.
Question 2
Which command must be globally enabled on a Cisco router to support IPv6?
A. ip routing ipv6
B. ipv6 unicast-routing
C. ipv6 routing
D. ip classless
E. ipv6 cef
Answer: B
Question 3
What number is a valid representation for the 200F:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?
A. 200F:0:0:AB/56
B. 200F:0:AB00::/56
C. 200F::AB00/56
D. 200F:AB/56
Answer: B
Question 4
An enterprise has plans to start adding IPv6 support. The initial deployment requires support from some IPv6-only devices that need to access servers that support only IPv4. Which of the following tools would be most appropriate?
A. Native IPv6
B. Point-to-point tunnels
C. Multipoint tunnels
D. NAT-PT
Answer: D
Explanation
The Network Address Translator – Protocol Translator (NAT-PT) defines a set of network-layer translation mechanisms designed to allow nodes that only support IPv4 to communicate with nodes that only support IPv6, during the transition to the use of IPv6 in the Internet.
NAT-PT provides IPv4/IPv6 protocol translation. It resides within an IP router, situated at the boundary of an IPv4 network and an IPv6 network. By installing NAT-PT between an IPv4 and IPv6 network, all IPv4 users are given access to the IPv6 network without modification in the local IPv4-hosts (and vice versa). Equally, all hosts on the IPv6 network are given access to the IPv4 hosts without modification to the local IPv6-hosts. This is accomplished with a pool of IPv4 addresses for assignment to IPv6 nodes on a dynamic basis as sessions are initiated across IPv4-IPv6 boundaries.
(Reference: http://www.ietf.org/rfc/rfc4966.txt and http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps1835/prod_white_paper09186a008011ff51_ps6640_Products_White_Paper.html)
Question 5
Using the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F:9C0::123A:121B
D. 2031::240F:::09C0:123A:121B
Answer: A
Question 6
Which of the following address types are associated with IPv6? (Choose three)
A. Unicast
B. Private
C. Broadcast
D. Public
E. Multicast
F. Anycast
Answer: A E F
Question 7
Which three IPv6 notations represent the same address? (Select three)
A. 2031::130F::9C0:876A:130B
B. 2031:0000:130F:0000:0000:09C0:876A:130B
C. 2031:0:130F:::9C0:876A:130B
D. 2031::130F:0::9C0:876A:130B
E. 2031:0:130F:0:0:09C0:876A: 130B
F. 2031:0:130F::9C0:876A:130B
Answer: B E F
Question 8
An IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across an IPv4 infrastructure. There are currently five IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true? (Choose three)
A. Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.
B. Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6.
C. Cisco IOS supports manual, generic, routing encapsulation (GRE), IPv6-compatible. 4to6, and multiprotocol Label Switching (MPLS) Overlay tunneling mechanism.
D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
E. A manual overlay tunnel supports point-to-multipoint tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.
F. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.
Answer: B D F
Question 9
What is the benefit of deploying IPv6 in a campus network using dual stack mode?
A. Dual Stack Mode takes advantage of IPv6 over IPv4 tunnel within a network.
B. IPv4 and IPv6 run alongside one another and have no dependency on each other to function
C. IPv4 and IPv6 share network resources.
D. IPv6 can depend on existing IPv4 routing, QoS, security, and multicast policies.
Answer: B
Question 10
Refer to the exhibit. Which two statements are true about the router configuration? (Choose two)
A. This configuration allows applications on the same segment to communicate via IPv4 or IPv6.
B. This configuration is referred to as a dual-stack 6to4 tunnel.
C. This configuration is referred to as a dual stack.
D. This configuration will attempt to route packets using IPv4 first, and if that fails, then IPv6.
Answer: A C
