IPv6 SLAAC Configuration Quiz
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Questions and Answers

What does the 'A' flag in a Router Advertisement (RA) message indicate?

  • The client needs to request additional information from a DHCPv6 server.
  • The client should configure its own default gateway.
  • The client will use the link-local address for communication.
  • The client should use the IPv6 Global Unicast Address (GUA) prefix and create its own Interface ID. (correct)

    • Which multicast address does R1 use to send Router Advertisement (RA) messages to all nodes?

  • ff02::a
  • ff02::1 (correct)
  • ff02::3
  • ff02::2

    • What information does the RA message include when the 'O' and 'M' flags are set to 0?

  • Only the link-local address of the router.
  • The requirement to join the IPv6 all-routers group.
  • DNS server and MTU information for configuration. (correct)
  • The client is instructed to ignore the provided prefix.

    • What is the purpose of Router Solicitation (RS) messages?

    <p>To request RA messages from the router.</p> Signup and view all the answers

    Which command can be used to verify if R1 has joined the IPv6 all-routers group?

    <p>show ipv6 interface</p> Signup and view all the answers

    What is the frequency of RA messages sent by R1?

    <p>Every 200 seconds</p> Signup and view all the answers

    What must a host do to generate an IPv6 Global Unicast Address (GUA) using SLAAC?

    <p>Receive a Router Advertisement with the A flag set to 1.</p> Signup and view all the answers

    Which IPv6 multicast address does the IPv6 all-routers group respond to?

    <p>ff02::2</p> Signup and view all the answers

    What triggers a router to send a Router Advertisements (RA) message?

    <p>When it receives a Router Solicitation (RS) message from a host</p> Signup and view all the answers

    Which method does SLAAC utilize to generate a host's 64-bit IPv6 interface identifier (ID)?

    <p>It can be either randomly generated or derived from the MAC address using EUI-64.</p> Signup and view all the answers

    How does SLAAC interact with DHCPv6 when obtaining an IPv6 address?

    <p>It works independently of DHCPv6 and does not interact.</p> Signup and view all the answers

    What is the role of the Router Solicitation (RS) message in the SLAAC process?

    <p>To request Router Advertisements (RAs) from the router.</p> Signup and view all the answers

    How frequently does a router send Router Advertisements (RAs) if no RS messages are received from hosts?

    <p>Every 200 seconds</p> Signup and view all the answers

    What does the O flag set to 1 in a Router Advertisement (RA) message indicate?

    <p>The host can use Stateless Address Autoconfiguration (SLAAC) and should also seek additional configuration from DHCPv6.</p> Signup and view all the answers

    If a client receives a stateless RA message, what action does it take?

    <p>It uses the information in the RA for addressing and sends a SOLICIT message to the DHCPv6 server for more configuration.</p> Signup and view all the answers

    Which command is used to enable Stateless DHCPv6 on an interface?

    <p>ipv6 nd other-config-flag</p> Signup and view all the answers

    What is the primary purpose of a stateful DHCPv6 operation?

    <p>To contact a DHCPv6 server for all configuration information.</p> Signup and view all the answers

    How does the DHCPv6 server interact in a stateless configuration?

    <p>It only supplies configuration parameters without binding addresses.</p> Signup and view all the answers

    What information is typically contained in a stateless RA message?

    <p>IPv6 GUA network prefix, prefix length, and flags for SLAAC and DHCPv6.</p> Signup and view all the answers

    What UDP port is used by DHCPv6 messages sent from the client to the server?

    <p>UDP port 547</p> Signup and view all the answers

    What default value does the M flag have in a stateless RA message?

    <p>0</p> Signup and view all the answers

    What is a key feature of the Router Solicitation (RS) process?

    <p>Hosts use RS messages to obtain a prefix from routers.</p> Signup and view all the answers

    What happens if the O flag is set to 0 in the RA?

    <p>The host must use only SLAAC and cannot seek DHCPv6 for additional information.</p> Signup and view all the answers

    What does the A flag in an RA message signify?

    <p>To use Stateless Address Autoconfiguration (SLAAC) for an IPv6 GUA</p> Signup and view all the answers

    Which flag in the RA message indicates that a stateful DHCPv6 server should be used?

    <p>M flag</p> Signup and view all the answers

    What is the primary function of SLAAC in an IPv6 network?

    <p>To enable hosts to generate their own unique IPv6 global unicast addresses</p> Signup and view all the answers

    How frequently does SLAAC send periodic ICMPv6 RA messages?

    <p>Every 200 seconds</p> Signup and view all the answers

    What scenario would lead to a host using the O flag from an RA message?

    <p>To indicate the availability of additional configuration from a stateless DHCPv6 server</p> Signup and view all the answers

    Which of the following best describes the nature of SLAAC?

    <p>SLAAC allows hosts to self-configure their addresses without a server</p> Signup and view all the answers

    Which of the following flags must be unselected to indicate that SLAAC is not being used?

    <p>A flag</p> Signup and view all the answers

    In a network with no DHCPv6 server, which method allows hosts to configure their IPv6 addresses?

    <p>SLAAC</p> Signup and view all the answers

    What does the A flag set to 1 in an RA message indicate to the client?

    <p>To create its own IPv6 GUA using the advertised prefix</p> Signup and view all the answers

    How often does a router send RA messages by default?

    <p>Every 200 seconds</p> Signup and view all the answers

    If an RA message includes both the A and M flags, what does this indicate?

    <p>The host can use either SLAAC or a stateful DHCPv6 server</p> Signup and view all the answers

    What type of service does SLAAC represent in terms of address assignment?

    <p>Stateless service</p> Signup and view all the answers

    Which command is used to enable a router to send RA messages?

    <p>ipv6 unicast-routing</p> Signup and view all the answers

    What information does a host acquire from the RA message when using SLAAC?

    <p>Subnet prefix information only</p> Signup and view all the answers

    What do the O and M flags set to 0 in an RA message instruct the client to do?

    <p>To rely solely on information provided in the RA</p> Signup and view all the answers

    What is the purpose of the DAD process in SLAAC?

    <p>To create a unique IPv6 address for a host</p> Signup and view all the answers

    Which method is NOT used by a host to generate its 64-bit interface identifier in SLAAC?

    <p>Using DHCPv6</p> Signup and view all the answers

    What triggers a router to send an additional RA message?

    <p>When it receives an RS message from a host</p> Signup and view all the answers

    What does SLAAC stand for in the context of IPv6 configuration?

    <p>Stateless Link Address and Autoconfiguration</p> Signup and view all the answers

    When using SLAAC, how does a host check for uniqueness of its IPv6 GUA?

    <p>By sending an ICMPv6 NS message with a multicast address</p> Signup and view all the answers

    Study Notes

    SLAAC Overview

    • Stateless Address Autoconfiguration (SLAAC) allows hosts to configure their own IPv6 global unicast addresses without needing a DHCPv6 server.
    • SLAAC is stateless, meaning no server maintains addressing information.
    • ICMPv6 Router Advertisement (RA) messages are sent periodically (every 200 seconds) to assist hosts in configuring their addresses.

    Router Solicitation and Advertisement

    • Hosts can send Router Solicitation (RS) messages to request Router Advertisement (RA) messages.
    • RA messages contain address configuration information for hosts utilizing SLAAC.
    • R1 configured with:
      • Link-local address: fe80::1
      • Global Unicast Address (GUA): 2001:db8:acad:1::1
      • Subnet: 2001:db8:acad:1::/64
      • IPv6 all-nodes multicast group: ff02::1

    RA Message Flags

    • Flags in RA messages inform hosts how to configure addressing:
      • A flag (Autoconfiguration flag): Set to 1, indicates using SLAAC to create a GUA.
      • O flag (Other Configuration flag): Set to 1, indicates additional configuration info is available from a stateless DHCPv6 server.
      • M flag (Managed Address Configuration flag): Indicates the use of a stateful DHCPv6 server for obtaining a GUA.

    Host Configuration Processes

    • Hosts typically acquire a 64-bit IPv6 subnet from RA and generate a unique 64-bit interface identifier (ID) through:
      • Random generation: Used by default in Windows 10.
      • EUI-64 method: Uses the host's MAC address to create an interface ID; however, this raises privacy concerns.

    Duplicate Address Detection (DAD)

    • DAD ensures the generated GUA is unique through ICMPv6 Neighbor Solicitation (NS) messages.
    • The solicited-node multicast address duplicates the last 24 bits of the host's IPv6 address.

    Stateless DHCPv6

    • When the RA indicates stateless DHCPv6, the host uses RA message information for addressing and contacts a DHCPv6 server for additional configurations.
    • The DHCPv6 server provides configuration parameters but does not maintain IPv6 address bindings.

    Stateful DHCPv6

    • If the RA indicates stateful DHCPv6, the host relies solely on the DHCPv6 server for all configuration information.

    Commands and Configuration

    • To enable SLAAC, routers must join the IPv6 all-routers group using the "ipv6 unicast-routing" command.
    • Use "show ipv6 interface" command to verify router settings.
    • The command "ipv6 nd other-config-flag" sets the O flag to 1 for stateless DHCPv6; "no ipv6 nd other-config-flag" resets it to SLAAC only.

    ICMPv6 Messages

    • PC sends an RS message to the all-routers multicast address (ff02::2) to request an RA.
    • The router replies with an RA message sent to the all-nodes multicast address (ff02::1), which the PC uses to configure its IPv6 settings.

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    Related Documents

    SRWE Module 8: SLAAC and DHCPv6 PDF

    Description

    Test your knowledge on the Stateless Address Autoconfiguration (SLAAC) process and its deployment options. This quiz will cover concepts such as Router Solicitation, Router Advertisement, and IPv6 addressing. Prepare to understand the workings of link-local and global unicast addresses.

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