ITN Unit 13

What are two ICMPv6 messages that are not present in ICMP for IPv4? (Choose two.)

• Neighbor Solicitation

• Destination Unreachable

• Host Confirmation

• Time Exceeded

• Router Advertisement

When the TTL decrements to 0 what happens?

• The packet is discarded

• The Hop Limit field takes over

• TTL is set back to 10

• TTL goes into negative numbres

ICMPv6 uses two improved features to message between router and device, these are;

• Router Solicitation

• Neighbour Solicitation

• Router Advertisement

• Neighbour Advertisement

Router Advertisement messages are sent how many seconds?

• 1

• 10

• 100

• 200

What protocol is used to make sure no two devices have the same IPv6 address?

• ICMP

• IPv6

• DAD

• DHCP

Answer explanation

duplicate address detection (DAD) to ensure that the IPv6 address is unique

Which address is a valid IPv6 link-local unicast address?

• FEC8:1::FFFF

• FD80::1:1234

• FE80::1:4545:6578:ABC1

• FE0A::100:7788:998F

• FC90:5678:4251:FFFF

Answer explanation

IPv6 LLAs are in the fe80::/10 range. The /10 indicates that the first 10 bits are 1111 1110 10xx xxxx. The first hextet has a range of 1111 1110 1000 0000 (fe80) to 1111 1110 1011 1111 (febf).

What type of IPv6 address is FE80::1?

• loopback

• link-local

• multicast

• global unicast

What is used in the EUI-64 process to create an IPv6 interface ID on an IPv6 enabled interface?

• the MAC address of the IPv6 enabled interface

• a randomly generated 64-bit hexadecimal address

• an IPv6 address that is provided by a DHCPv6 server

• an IPv4 address that is configured on the interface

Answer explanation

The EUI-64 process uses the MAC address of an interface to construct an interface ID (IID). Because the MAC address is only 48 bits in length, 16 additional bits (FF:FE) must be added to the MAC address to create the full 64-bit interface ID.

Which service provides dynamic global IPv6 addressing to end devices without using a server that keeps a record of available IPv6 addresses?

• stateful DHCPv6

• SLAAC

• static IPv6 addressing

• stateless DHCPv6

Answer explanation

Using stateless address autoconfiguration (SLAAC), a PC can solicit a router and receive the prefix length of the network. From this information the PC can then create its own IPv6 global unicast address.

Which protocol supports Stateless Address Autoconfiguration (SLAAC) for dynamic assignment of IPv6 addresses to a host?

• ARPv6

• DHCPv6

• ICMPv6

• UDP

Answer explanation

SLAAC uses ICMPv6 messages when dynamically assigning an IPv6 address to a host. DHCPv6 is an alternate method of assigning an IPv6 addresses to a host. ARPv6 does not exist. Neighbor Discovery Protocol (NDP) provides the functionality of ARP for IPv6 networks. UDP is the transport layer protocol used by DHCPv6.