Podcast
Questions and Answers
What does the flag 'A' signify in the RA messages sent from R1?
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?
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?
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?
Which addresses are included in R1's IPv6 configuration?
How does SLAAC interact with DHCPv6 when enabled?
How does SLAAC interact with DHCPv6 when enabled?
Which multicast group does R1 join to send RA messages?
Which multicast group does R1 join to send RA messages?
What is the significance of the 'O' and 'M' flags being set to 0 in R1's RA messages?
What is the significance of the 'O' and 'M' flags being set to 0 in R1's RA messages?
What does sending RA messages every 200 seconds accomplish primarily for hosts?
What does sending RA messages every 200 seconds accomplish primarily for hosts?
What does the A flag set to 1 in an RA message indicate to a client?
What does the A flag set to 1 in an RA message indicate to a client?
Which of the following flags instructs the client to rely solely on the information in the RA message?
Which of the following flags instructs the client to rely solely on the information in the RA message?
What are the two possible methods for a host to generate its 64-bit interface identifier (ID) in SLAAC?
What are the two possible methods for a host to generate its 64-bit interface identifier (ID) in SLAAC?
What happens when a router receives a Router Solicitation (RS) message from a host?
What happens when a router receives a Router Solicitation (RS) message from a host?
How often does a router send periodic RA messages by default?
How often does a router send periodic RA messages by default?
Which command can be used to verify if a router is enabled for sending RA messages?
Which command can be used to verify if a router is enabled for sending RA messages?
Which interaction allows SLAAC to function effectively alongside DHCPv6?
Which interaction allows SLAAC to function effectively alongside DHCPv6?
What is the purpose of the Duplicated Address Detection (DAD) process in SLAAC?
What is the purpose of the Duplicated Address Detection (DAD) process in SLAAC?
What does the 'O' flag indicate in a Router Advertisement (RA) message?
What does the 'O' flag indicate in a Router Advertisement (RA) message?
Which port is used for client to server DHCPv6 messages?
Which port is used for client to server DHCPv6 messages?
How does a host utilize the information from a stateless RA message?
How does a host utilize the information from a stateless RA message?
What configuration command is used to enable Stateless DHCPv6 on an interface?
What configuration command is used to enable Stateless DHCPv6 on an interface?
What happens when the M flag is set to its default value of 0 in a RA message?
What happens when the M flag is set to its default value of 0 in a RA message?
What is the primary distinction between stateful and stateless DHCPv6?
What is the primary distinction between stateful and stateless DHCPv6?
In which situation would a host use SLAAC?
In which situation would a host use SLAAC?
What is the purpose of periodic RA messages in a network?
What is the purpose of periodic RA messages in a network?
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 interfacecommand.
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.
