Module 5.6.3 IPv6 Addressing Quiz Answers

Module 5.6.3 IPv6 Addressing Quiz Answers

Network Addressing and Basic Troubleshooting – Module 5.6.3 IPv6 Addressing Quiz Answers

1. Which type of IPv6 address is not routable and used only for communication on a single subnet?

  • global unicast address
  • link-local address
  • loopback address
  • unique local address
  • unspecified address

Explanation: Link-local addresses have relevance only on the local link. Routers will not forward packets that include a link-local address as either the source or destination address.

2. What are the three parts of an IPv6 global unicast address? (Choose three.)

  • broadcast address
  • global routing prefix
  • subnet mask
  • subnet ID
  • interface ID

Explanation: The general format for IPv6 global unicast addresses includes a global routing prefix, a subnet ID, and an interface ID. The global routing prefix is the network portion of the address. A typical global routing prefix is /48 assigned by the Internet provider. The subnet ID portion can be used by an organization to create multiple subnetwork numbers. The interface ID is similar to the host portion of an IPv4 address.

3. What are two types of IPv6 unicast addresses? (Choose two.)

  • multicast
  • loopback
  • link-local
  • anycast
  • broadcast

Explanation: Multicast, anycast, and unicast are types of IPv6 addresses. There is no broadcast address in IPv6. Loopback and link-local are specific types of unicast addresses.

4. A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway?

  • the all-routers multicast address
  • the link-local address of the router interface that is attached to the network
  • the unique local address of the router interface that is attached to the network
  • the global unicast address of the router interface that is attached to the network

Explanation: When a PC is configured to use the SLAAC method for configuring IPv6 addresses, it will use the prefix and prefix-length information that is contained in the RA message, combined with a 64-bit interface ID (obtained by using the EUI-64 process or by using a random number that is generated by the client operating system), to form an IPv6 address. It uses the link-local address of the router interface that is attached to the LAN segment as its IPv6 default gateway address.

5. What are IPv6 ULAs?

  • a method of translating IPv6 addresses into IPv4 addresses
  • a private IPv6 address range used for communication within a local site
  • any device that can run both an IPv6 and an IPv4 protocol stack simultaneously
  • tunneling protocols that allow two IPv6 networks to communicate across an IPv4 network

Explanation: IPv6 unique local addresses (ULAs) are a range of private addresses, similar to RFC 1918 addresses, which can be used to address endpoints in a local network. They are not meant to be routable on the Internet.

6. Which address type is not supported in IPv6?

  • private
  • multicast
  • unicast
  • broadcast

Explanation: IPv6 supports unicast, private, and multicast addresses but does not support Layer 3 broadcasts.

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

  • stateful DHCPv6
  • static IPv6 addressing
  • stateless DHCPv6

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.

8. At a minimum, which address is required on IPv6-enabled interfaces?

  • link-local
  • unique local
  • site local
  • global unicast

Explanation: All IPv6 enabled interfaces must at minimum have a link-local address. Other IPv6 addresses can be assigned to the interface as required.

9. Which type of IPv6 address refers to any unicast address that is assigned to multiple hosts?

  • unique local
  • global unicast
  • link-local
  • anycast

Explanation: The IPv6 specifications include anycast addresses. An anycast address is any unicast IPv6 address that is assigned to multiple devices.

10. Which address is used to derive an IPv6 interface ID using the EUI-64 method?

  • IPv4
  • MAC
  • multicast
  • Layer 4

Explanation: An IPv6 interface ID using the EUI-64 method is generated by inserting the hex digits FFFE between the first and last 24-bits of the interface MAC address and then inverting the seventh bit.

11. Which ICMPv6 message type contains network configuration information for clients that are performing SLAAC?

  • router advertisement
  • router solicitation
  • neighbor advertisement
  • neighbor solicitation

Explanation: When performing SLAAC, IPv6 clients receive network configuration information from router advertisement messages that are sent by a local router.

12. How many bits of an IPv6 address are used to identify the interface ID?

  • 32
  • 48
  • 64
  • 128

Explanation: An IPv6 address is split into a 64-bit prefix and a 64-bit interface ID.

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