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New CCNA – IPv6
Question 1
Which IPv6 address is valid?
A. 2031:0:130F::9C0:876A:130B
B. 2001:0DB8:0000:130F:0000:0000:08GC:140B
C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B
Answer: A
Explanation
Answer B is not correct because it has a letter “G”.
Answer C is not correct because it has a letter “H”.
Answer D is not correct because it has two “::”.
Question 2
Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?
A. ::1
B. ::
C. 2000::/3
D. 0::/10
Answer: A
Question 3
How many bits are contained in each field of an IPv6 address?
A. 24
B. 4
C. 8
D. 16
Answer: D
Question 4
Which IPv6 address is the all-router multicast group?
A. FF02::1
B. FF02::2
C. FF02::3
D. FF02::4
Answer: B
Question 5
Which three are characteristics of an IPv6 anycast address? (Choose three)
A. one-to-many communication model
B. one-to-nearest communication model
C. any-to-many communication model
D. a unique IPv6 address for each device in the group
E. the same address for multiple devices in the group
F. delivery of packets to the group interface that is closest to the sending device
Answer: B E F
Question 6
Which two are features of IPv6? (Choose two)
A. multicast
B. broadcast
C. allcast
D. podcast
E. anycast
Answer: A E
Explanation
Anycast IPv6 addresses are 128-bit identifiers for interfaces and sets of interfaces. A packet sent to an anycast address is delivered to one of the interfaces identified by that address (the “nearest” one, according to the routing protocols’ measure of distance)
Question 7
Which three approaches can be used while migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three)
A. static mapping of IPv4 address to IPv6 addresses
B. configuring IPv4 tunnels between IPv6 islands
C. use DHCPv6 to map IPv4 addresses to IPv6 addresses
D. use proxying and translation (NAT-PT) to translate IPv6 packets into IPv4 packets
E. configure IPv6 directly
F. enable dual-stack routing
Answer: B D F
Question 8
Which of these represents an IPv6 link-local address?
A. FE08::280e:611:a:f14f.3d69
B. FE81::280f.512b:e14f:3d69
C. FE80::380e:611a:e14f:3d69
D. FEFE:0345:5f1b::e14d:3d69
Answer: C
Explanation
The range of IPv6 link-local address (similar to the Windows auto-configuration IP address of 169.254.x.x.) is FE80::/10. For more information about IPv6, please read my IPv6 tutorial.
Question 9
Which command enables IPv6 forwarding on a cisco router?
A. IPv6 host
B. IPv6 unicast-routing
C. IPv6 local
D. IPv6 neighbor
Answer: B
Explanation
An example of configuring RIPng (similar to RIPv2 but is used for IPv6) is shown below:
Router(config)#ipv6 unicast-routing (Enables the forwarding of IPv6 unicast datagrams globally on the router)
Router(config)#interface fa0/0
Router(config-if)#ipv6 rip 9tut enable (9tut is the process name of this RIPng)
Question 10
Which two statements describe characteristics of IPv6 unicast addressing? (Choose two)
A. Global addresses start with 2000::/3
B. Link-local addresses start with FE00:/12
C. Link-local addresses start with FF00::/10
D. There is only one loopback address and it is ::1
E. If a global address is assigned to an interface, then that is the only allowable address for the interface.
Answer: A D
Explanation
Below is the list of common kinds of IPv6 addresses:
From the above table, we learn that A and D are correct while B and C are incorrect. Notice that the IPv6 unicast loopback address is equivalent to the IPv4 loopback address, 127.0.0.1. The IPv6 loopback address is 0:0:0:0:0:0:0:1, or ::1.
E is not correct because of anycast addresses which are indistinguishable from normal unicast addresses. You can think of anycast addresses like this: “send it to nearest one which have this address”. An anycast address can be assigned to many interfaces and the first interface receives the packet destined for this anycast address will proceed the packet. A benefit of anycast addressing is the capability to share load to multiple hosts. An example of this benefit is if you are a Television provider with multiple servers and you want your users to use the nearest server to them then you can use anycast addressing for your servers. When the user initiates a connection to the anycast address, the packet will be routed to the nearest server (the user does not have to specify which server they want to use).
Question 11
What are three features of the IPv6 protocol? (Choose three)
A. optional IPsec
B. autoconfiguration
C. no broadcasts
D. complicated header
E. plug-and-play
F. checksums
Answer: B C E
Question 12
Which two of these statements are true of IPv6 address representation? (Choose two)
A. The first 64 bits represent the dynamically created interface ID.
B. A single interface may be assigned multiple IPV6 addresses of any type.
C. Every IPV6 interface contains at least one loopback address.
D. Leading zeros in an IPV6 16 bit hexadecimal field are mandatory.
Answer: B C
Explanation
Leading zeros in IPv6 are optional do that 05C7 equals 5C7 and 0000 equals 0 -> D is not correct.
Question 13
Which option is a valid IPv6 address?
A. 2001:0000:130F::099a::12a
B. 2002:7654:A1AD:61:81AF:CCC1
C. FEC0:ABCD:WXYZ:0067::2A4
D. 2004:1:25A4:886F::1
Answer: D
Question 14
What is the alternative notation for the IPV6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?
A. B514:82C3:0029::EC7A:0000:EC72
B. B514:82C3:0029:EC7A:EC72
C. B514:82C3::0029:EC7A:0:EC72
D. B514:82C3::0029:EC7A:EC72
Answer: C
Question 15
Which switch would STP choose to become the root bridge in the selection process?
A. 32768: 11-22-33-44-55-66
B. 32768: 22-33-44-55-66-77
C. 32769: 11-22-33-44-55-65
D. 32769: 22-33-44-55-66-78
Answer: A
Question 16
Which command can you use to manually assign a static IPV6 address to a router interface?
A. ipv6 address PREFIX_1::1/64
B. ipv6 autoconfig 2001:db8:2222:7272::72/64
C. ipv6 autoconfig
D. ipv6 address 2001:db8:2222:7272::72/64
Answer: D
Explanation
An example of configuring IPv6 on an interface is shown below:
Router(config)# interface fastethernet 0/0
Router(config-if)# ipv6 address 3000::1/64
Question 17
What is known as “one-to-nearest” addressing in IPv6?
A. global unicast
B. anycast
C. multicast
D. unspecified address
Answer: B
Question 18
The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two)
A. telnet access does not require a password
B. nat
C. no broadcast
D. change of destination address in the IPv6 header
E. change of source address in the IPv6 header
F. autoconfiguration
Answer: C F
Explanation
With IPv6, devices can build a link-local address automatically. But notice this address is only used for communications within the local subnetwork, routers do not forward these addresses.
Which IPv6 address is valid?
A. 2031:0:130F::9C0:876A:130B
B. 2001:0DB8:0000:130F:0000:0000:08GC:140B
C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B
Answer: A
Explanation
Answer B is not correct because it has a letter “G”.
Answer C is not correct because it has a letter “H”.
Answer D is not correct because it has two “::”.
Question 2
Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?
A. ::1
B. ::
C. 2000::/3
D. 0::/10
Answer: A
Question 3
How many bits are contained in each field of an IPv6 address?
A. 24
B. 4
C. 8
D. 16
Answer: D
Question 4
Which IPv6 address is the all-router multicast group?
A. FF02::1
B. FF02::2
C. FF02::3
D. FF02::4
Answer: B
Question 5
Which three are characteristics of an IPv6 anycast address? (Choose three)
A. one-to-many communication model
B. one-to-nearest communication model
C. any-to-many communication model
D. a unique IPv6 address for each device in the group
E. the same address for multiple devices in the group
F. delivery of packets to the group interface that is closest to the sending device
Answer: B E F
Question 6
Which two are features of IPv6? (Choose two)
A. multicast
B. broadcast
C. allcast
D. podcast
E. anycast
Answer: A E
Explanation
Anycast IPv6 addresses are 128-bit identifiers for interfaces and sets of interfaces. A packet sent to an anycast address is delivered to one of the interfaces identified by that address (the “nearest” one, according to the routing protocols’ measure of distance)
Question 7
Which three approaches can be used while migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three)
A. static mapping of IPv4 address to IPv6 addresses
B. configuring IPv4 tunnels between IPv6 islands
C. use DHCPv6 to map IPv4 addresses to IPv6 addresses
D. use proxying and translation (NAT-PT) to translate IPv6 packets into IPv4 packets
E. configure IPv6 directly
F. enable dual-stack routing
Answer: B D F
Question 8
Which of these represents an IPv6 link-local address?
A. FE08::280e:611:a:f14f.3d69
B. FE81::280f.512b:e14f:3d69
C. FE80::380e:611a:e14f:3d69
D. FEFE:0345:5f1b::e14d:3d69
Answer: C
Explanation
The range of IPv6 link-local address (similar to the Windows auto-configuration IP address of 169.254.x.x.) is FE80::/10. For more information about IPv6, please read my IPv6 tutorial.
Question 9
Which command enables IPv6 forwarding on a cisco router?
A. IPv6 host
B. IPv6 unicast-routing
C. IPv6 local
D. IPv6 neighbor
Answer: B
Explanation
An example of configuring RIPng (similar to RIPv2 but is used for IPv6) is shown below:
Router(config)#ipv6 unicast-routing (Enables the forwarding of IPv6 unicast datagrams globally on the router)
Router(config)#interface fa0/0
Router(config-if)#ipv6 rip 9tut enable (9tut is the process name of this RIPng)
Question 10
Which two statements describe characteristics of IPv6 unicast addressing? (Choose two)
A. Global addresses start with 2000::/3
B. Link-local addresses start with FE00:/12
C. Link-local addresses start with FF00::/10
D. There is only one loopback address and it is ::1
E. If a global address is assigned to an interface, then that is the only allowable address for the interface.
Answer: A D
Explanation
Below is the list of common kinds of IPv6 addresses:
| Loopback address | ::1 |
| Link-local address | FE80::/10 |
| Site-local address | FEC0::/10 |
| Global address | 2000::/3 |
| Multicast address | FF00::/8 |
E is not correct because of anycast addresses which are indistinguishable from normal unicast addresses. You can think of anycast addresses like this: “send it to nearest one which have this address”. An anycast address can be assigned to many interfaces and the first interface receives the packet destined for this anycast address will proceed the packet. A benefit of anycast addressing is the capability to share load to multiple hosts. An example of this benefit is if you are a Television provider with multiple servers and you want your users to use the nearest server to them then you can use anycast addressing for your servers. When the user initiates a connection to the anycast address, the packet will be routed to the nearest server (the user does not have to specify which server they want to use).
Question 11
What are three features of the IPv6 protocol? (Choose three)
A. optional IPsec
B. autoconfiguration
C. no broadcasts
D. complicated header
E. plug-and-play
F. checksums
Answer: B C E
Question 12
Which two of these statements are true of IPv6 address representation? (Choose two)
A. The first 64 bits represent the dynamically created interface ID.
B. A single interface may be assigned multiple IPV6 addresses of any type.
C. Every IPV6 interface contains at least one loopback address.
D. Leading zeros in an IPV6 16 bit hexadecimal field are mandatory.
Answer: B C
Explanation
Leading zeros in IPv6 are optional do that 05C7 equals 5C7 and 0000 equals 0 -> D is not correct.
Question 13
Which option is a valid IPv6 address?
A. 2001:0000:130F::099a::12a
B. 2002:7654:A1AD:61:81AF:CCC1
C. FEC0:ABCD:WXYZ:0067::2A4
D. 2004:1:25A4:886F::1
Answer: D
Question 14
What is the alternative notation for the IPV6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?
A. B514:82C3:0029::EC7A:0000:EC72
B. B514:82C3:0029:EC7A:EC72
C. B514:82C3::0029:EC7A:0:EC72
D. B514:82C3::0029:EC7A:EC72
Answer: C
Question 15
Which switch would STP choose to become the root bridge in the selection process?
A. 32768: 11-22-33-44-55-66
B. 32768: 22-33-44-55-66-77
C. 32769: 11-22-33-44-55-65
D. 32769: 22-33-44-55-66-78
Answer: A
Question 16
Which command can you use to manually assign a static IPV6 address to a router interface?
A. ipv6 address PREFIX_1::1/64
B. ipv6 autoconfig 2001:db8:2222:7272::72/64
C. ipv6 autoconfig
D. ipv6 address 2001:db8:2222:7272::72/64
Answer: D
Explanation
An example of configuring IPv6 on an interface is shown below:
Router(config)# interface fastethernet 0/0
Router(config-if)# ipv6 address 3000::1/64
Question 17
What is known as “one-to-nearest” addressing in IPv6?
A. global unicast
B. anycast
C. multicast
D. unspecified address
Answer: B
Question 18
The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two)
A. telnet access does not require a password
B. nat
C. no broadcast
D. change of destination address in the IPv6 header
E. change of source address in the IPv6 header
F. autoconfiguration
Answer: C F
Explanation
With IPv6, devices can build a link-local address automatically. But notice this address is only used for communications within the local subnetwork, routers do not forward these addresses.