IPv6 SLAAC Configuration Quiz

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Questions and Answers

What does the flag 'A' signify in the RA messages sent from R1?

Indicates that R1 will not provide any configuration information to the client.

Informs the client to use DHCPv6 for address configuration.

Indicates the presence of additional optional configuration parameters.

Informs the client to use the IPv6 GUA prefix and create its own Interface ID. (correct)

Which of the following describes the Router Solicitation (RS) process?

A router sends an RA message every 30 seconds to all hosts.

A host requests an RA message from a router to learn about address configuration. (correct)

A router uses RS to directly assign IP addresses to clients.

A host sends an RA message to provide address configuration information.

What happens every 200 seconds in the context of R1's configuration?

R1 stops sending RA messages to conserve bandwidth.

R1 joins the all-routers multicast group again.

R1 sends RA messages to the all-nodes multicast address ff02::1. (correct)

R1 requests additional information from DHCPv6 servers.

Which addresses are included in R1's IPv6 configuration?

2001:db8:acad:1::1 and fe80::1 (C) Signup and view all the answers

How does SLAAC interact with DHCPv6 when enabled?

SLAAC can be deployed alongside DHCPv6 for additional configuration. (D) Signup and view all the answers

Which multicast group does R1 join to send RA messages?

ff02::1 (B) Signup and view all the answers

What is the significance of the 'O' and 'M' flags being set to 0 in R1's RA messages?

Clients can expect no additional configuration information. (C) Signup and view all the answers

What does sending RA messages every 200 seconds accomplish primarily for hosts?

Provides hosts with the latest IPv6 address configurations. (A) Signup and view all the answers

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

The client should generate its own IPv6 GUA using the advertised prefix. (C) Signup and view all the answers

Which of the following flags instructs the client to rely solely on the information in the RA message?

O flag set to 0 (C) Signup and view all the answers

What are the two possible methods for a host to generate its 64-bit interface identifier (ID) in SLAAC?

Randomly generated or EUI-64 (A) Signup and view all the answers

What happens when a router receives a Router Solicitation (RS) message from a host?

The router sends a Router Advertisement (RA) message immediately. (D) Signup and view all the answers

How often does a router send periodic RA messages by default?

Every 200 seconds (A) Signup and view all the answers

Which command can be used to verify if a router is enabled for sending RA messages?

show ipv6 interface (A) Signup and view all the answers

Which interaction allows SLAAC to function effectively alongside DHCPv6?

SLAAC can operate independently or with DHCPv6 for configurations. (D) Signup and view all the answers

What is the purpose of the Duplicated Address Detection (DAD) process in SLAAC?

To ensure the IPv6 GUA assigned to a host is unique. (D) Signup and view all the answers

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

The host should seek additional configuration from a DHCPv6 server. (A) Signup and view all the answers

Which port is used for client to server DHCPv6 messages?

UDP port 547 (C) Signup and view all the answers

How does a host utilize the information from a stateless RA message?

It uses the RA message for addressing and contacts a DHCPv6 server for additional info. (D) Signup and view all the answers

What configuration command is used to enable Stateless DHCPv6 on an interface?

ipv6 nd other-config-flag (C) Signup and view all the answers

What happens when the M flag is set to its default value of 0 in a RA message?

The host will not seek network configuration from a DHCPv6 server. (C) Signup and view all the answers

What is the primary distinction between stateful and stateless DHCPv6?

Stateful DHCPv6 provides all configuration information while stateless does not. (D) Signup and view all the answers

In which situation would a host use SLAAC?

When the host receives a stateless RA message. (C) Signup and view all the answers

What is the purpose of periodic RA messages in a network?

To provide hosts with updated information on network parameters. (C) Signup and view all the answers

Study Notes

SLAAC Overview

Hosts send Router Solicitation (RS) messages to request Router Advertisements (RA).
SLAAC can operate as a standalone service or in conjunction with DHCPv6.

Enabling SLAAC on R1

R1 G0/0/1 interface has:
- Link-local IPv6 address: fe80::1
- Global Unicast Address (GUA): 2001:db8:acad:1::1
- Subnet: 2001:db8:acad:1::/64
- All-nodes multicast address: ff02::1
R1 joins the all IPv6 multicast group, sending RA messages to hosts every 200 seconds.

Router Groups and RA Messaging

R1 responds to the IPv6 all-routers multicast address ff02::2.
Verification of group membership can be done with the show ipv6 interface command.

SLAAC Only Configuration

RA messages from R1 have specific flags:
- A = 1: Instructs clients to construct their own Interface ID using the advertised GUA prefix.
- O = 0, M = 0: Clients use the RA's information exclusively without additional configurations.
Hosts use ICMPv6 RA messages for configuration, negating the need for DHCP.

Duplicate Address Detection (DAD)

Hosts generate 64-bit interface identifiers via random generation or EUI-64.
DAD ensures IPv6 GUA uniqueness by sending ICMPv6 Neighbor Solicitation (NS) messages.

Stateless DHCPv6 Operation

An RA indicating stateless DHCPv6 leads hosts to use RA for addressing and contact a DHCPv6 server for extra configurations.
The DHCPv6 server provides configuration parameters but does not maintain an address binding list.

RA Configuration for Stateless DHCPv6

Enable stateless DHCPv6 on an interface with the command ipv6 nd other-config-flag, setting O flag to 1.
A flag = 1 indicates SLAAC, while O flag = 1 means to contact a DHCPv6 server for additional configuration.

Stateful DHCPv6 Operation

If RA points to stateful DHCPv6, hosts receive all configuration information from the DHCPv6 server.

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Description

Test your knowledge on the Stateless Address Autoconfiguration (SLAAC) method for IPv6. This quiz covers the various configurations, including router solicitations and link-local addresses. Dive into the details of IPv6 GUA and subnet addresses with practical examples.