ICND1 – IPv6 Questions

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Question 1

[am4show have=’p2;’]Which technology supports the stateless assignment of IPv6 addresses?

A. DNS
B. DHCPv6
C. DHCP
D. autoconfiguration

 

Answer: B[/am4show]

Explanation

There are several ways to assign IPv6 to a device:

+ Static IPv6: The IPv6 address, subnet prefix length and default gateway are configured manually in the system configuration file.
+ Dynamic Host Configuration Protocol for IPv6 (DHCPv6): this mode requires a DHCPv6 server in your LAN. This is the most used mode for IPv6 assignment. There are two methods of DHCPv6:
– stateless mode: Only extended information, such as primary and optional secondary DNS server, is obtained from a DHCPv6 server. IPv6 address is not assigned, so the IPv6 address from the Ethernet configuration is set for a Static address of Ethernet interface.
– stateful mode: DHCPv6 server maintains a database of leased IPv6 addresses, and assigns to the client an unused IPv6 address. The DHCPv6 server specifies also a primary and optional secondary DNS server. The DNS server is used to resolve the IP address for a known host name.
+ IPv6 Stateless Address Autoconfiguration (SLAAC): provides the ability to address a host based on a network prefix that is advertised from a local network router via Router Advertisements (RA). Notice that with this mode, the device which requires an IPV6 always receive a dynamic IPv6 address.

The question asks about “stateless assignment of IPv6 addresses” which means stateless mode of DHCPv6.

Question 2

[am4show have=’p2;’]Which entity assigns IPv6 addresses to end users?

A. ICANN
B. APNIC
C. RIR
D. ISPs

 

Answer: D[/am4show]

Explanation

According to the official IANA website “Users are assigned IP addresses by Internet service providers (ISPs). ISPs obtain allocations of IP addresses from a local Internet registry (LIR) or National Internet Registry (NIR), or from their appropriate Regional Internet Registry (RIR): https://www.iana.org/numbers

Question 3

[am4show have=’p2;’]What is one requirement for interfaces to run IPv6?

A. An IPv6 address must be configured on the interface.
B. An IPv4 address must be configured.
C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface.
D. IPv6 must be enabled with the ipv6 enable command in global configuration mode.

 

Answer: A[/am4show]

Explanation

To run IPv6 on an interface we have to configure an IPv6 on that interface somehow -> A is correct.

IPv6 must be enabled first but with the “ipv6 unicast-routing”, not “ipv6 enable” command -> D is not correct.

Question 4

[am4show have=’p2;’]What is the requirement of configuring 6to4 tunnelling on two routers?

A. Both ipv6 and ipv4 must be configured
B. Only IPv6
C. Only IPv4

 

Answer: A[/am4show]

Question 5

[am4show have=’p2;’]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[/am4show]

Question 6

[am4show have=’p2;’]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[/am4show]

Explanation

Leading zeros in IPv6 are optional do that 05C7 equals 5C7 and 0000 equals 0 -> D is not correct.

Question 7

[am4show have=’p2;’]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[/am4show]

Question 8

[am4show have=’p2;’]How many bits are contained in each field of an IPv6 address?

A. 24
B. 4
C. 8
D. 16

 

Answer: D[/am4show]

Question 9

[am4show have=’p2;’]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[/am4show]

Question 10

[am4show have=’p2;’]Which statement about IPv6 is true?

A. Addresses are not hierarchical and are assigned at random.
B. Broadcasts have been eliminated and replaced with multicasts.
C. There are 2.7 billion available addresses.
D. An interface can only be configured with one IPv6 address.

 

Answer: B[/am4show]