Module 6.2.3 IPv6 Neighbor Discovery Quiz Answers

Module 6.2.3 IPv6 Neighbor Discovery Quiz Answers

Network Addressing and Basic Troubleshooting – Module 6.2.3 IPv6 Neighbor Discovery Quiz Answers

1. Which two ICMPv6 messages are used during the Ethernet MAC address resolution process? (Choose two.)

  • router solicitation
  • router advertisement
  • neighbor solicitation
  • neighbor advertisement
  • echo request

Explanation: IPv6 uses neighbor solicitation (NS) and neighbor advertisement (NA) ICMPv6 messages for MAC address resolution.

2. What address scope is used in the IPv6 frame to ensure that an IPv6 neighbor solicitation message would not be forwarded by routers?

  • site-local scope
  • link-local scope
  • subnet-local scope
  • interface-local scope

Explanation: An IPv6 neighbor solicitation message is sent via multicast. The multicast address is set with the link-local scope so the message can transmit only within the same link.

3. What type of data transmission does an IPv6 host use to send a neighbor solicitation message?

  • unicast
  • anycast
  • multicast
  • broadcast

Explanation: When an IPv6 host needs to initiate address resolution process, the host sends a multicast neighbor solicitation message.

4. What type of Ethernet frame does an IPv6 host use to send a message in responding to an address resolution request?

  • unicast
  • anycast
  • multicast
  • broadcast

Explanation: An IPv6 host will send a unicast Ethernet frame when the host receives a neighbor solicitation message.

5. How many messages are used in ICMPv6 neighbor discovery protocol?

  • 3
  • 4
  • 5
  • 6

Explanation: IPv6 Neighbor Discovery protocol, also referred to as ND or NDP, provides address resolution, router discovery, and redirection services for IPv6 using ICMPv6. ICMPv6 ND uses five ICMPv6 messages to perform these services. They are neighbor solicitation, neighbor advertisement, router solicitation, router advertisement, and redirect.

6. Which protocol provides messages to support IPv6 address resolution?

  • DNS
  • ARP
  • ICMPv6
  • DHCPv6

Explanation: IPv6 Neighbor Discovery protocol, also referred to as ND or NDP, provides address resolution, router discovery, and redirection services for IPv6 using ICMPv6.

7. Which OSI layer provides IPv6 neighbor discovery operation

  • network
  • data link
  • transport
  • application

Explanation: IPv6 Neighbor Discovery protocol, also referred to as ND or NDP, provides address resolution, router discovery, and redirection services for IPv6 using ICMPv6. ICMPv6 is an OSI network layer protocol.

8. Which method would an IPv6-enabled host using SLAAC employ to learn the address of the default gateway?

  • router advertisement messages received from the link router
  • neighbor solicitation messages sent to link neighbors
  • neighbor advertisement messages received from link neighbors
  • router solicitation messages received from the link router

Explanation: When using SLAAC, a host will learn from the router advertisement that is sent by the link router the address to use as a default gateway.

9. Which message should an IPv6 host send in response to a request of its MAC address?

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

Explanation: When an IPv6 host receives an ICMPv6 neighbor solicitation message for MAC address resolution, the host returns a neighbor advertisement message to provide the MAC address.

10. Which statement describes the neighbor solicitation and neighbor advertisement messages used in the IPv6 neighbor discovery protocol?

  • They are used only between two routers.
  • They are used only between two computers.
  • They are used for messaging to all devices on the same network.
  • They are used for device-to-device messaging and devices include both computers and routers.

Explanation: Neighbor Solicitation and Neighbor Advertisement messages are used for device-to-device messaging such as address resolution. Devices include both host computers and routers.

11. IPv6 host A is sending a neighbor solicitation message to IPv6 host B on the same Ethernet network. What address type is used in the Destination MAC field of the Ethernet frame header?

  • unicast MAC address
  • anycast MAC address
  • multicast MAC address
  • broadcast MAC address

Explanation: When an IPv6 host sends a neighbor solicitation message to another IPv6 host on the same Ethernet network, the sending host creates an Ethernet frame and add a multicast MAC address in the Destination MAC address field.

12. An IPv6 host needs to start communication with another IPv6 host. What is the first step that the sending host should do?

  • Broadcast an ARP message to the network.
  • Send a neighbor solicitation message to the destination host.
  • Determine if the destination host is on the same IPv6 network.
  • Send a neighbor advertisement message to the destination host.

Explanation: When a host needs to initiate a communication to another host, the first thing the sending host needs to do is to determine if the destination host is on the same network. This will lead to the decision as to whether the packet should be sent directly to the destination host or to the default gateway device.

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