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Difficulty: HardIPv6 Addressing and Deployment

An enterprise network infrastructure team is implementing IPv6 addressing across corporate VLANs. The core router is configured to transmit Router Advertisement (RA) messages on the local segment with the Managed Address Configuration flag set to 0 (M=0M=0) and the Other Stateful Configuration flag set to 1 (O=1O=1). Which of the following best describes how client workstations on this subnet will obtain their IPv6 configuration parameters?

  1. Workstations generate their IPv6 global unicast address autonomously using SLAAC from the advertised prefix, and query a stateless DHCPv6 server for additional parameters such as DNS server addresses.Answer
  2. B
    Workstations obtain both their IPv6 global unicast address and all network configuration parameters exclusively from a stateful DHCPv6 server.
  3. C
    Workstations use SLAAC to generate their IPv6 address via EUI-64 but are prevented from receiving any domain name resolution settings because DHCPv6 is disabled by the M=0M=0 flag.
  4. D
    Workstations derive their link-local address via SLAAC, but must compress their global unicast address using double-colon notation before registering with the local router.

Answer

Workstations generate their IPv6 global unicast address autonomously using SLAAC from the advertised prefix, and query a stateless DHCPv6 server for additional parameters such as DNS server addresses.
In IPv6 deployment, ICMPv6 Router Advertisement (RA) flags direct host configuration behavior. When the Managed Address flag is off (M=0M=0) and the Other flag is on (O=1O=1), clients utilize Stateless Address Autoconfiguration (SLAAC) to build their own global unicast IP address using the prefix provided in the RA message. Concurrently, clients send information requests to a stateless DHCPv6 server to acquire non-address parameters such as DNS server addresses and domain names.

Step-by-Step Solution

1
Analyze the Router Advertisement (RA) flag settings provided in the scenario.
The Managed Address Configuration flag is set to 0 (M=0M=0), and the Other Stateful Configuration flag is set to 1 (O=1O=1).
RA flags dictate whether clients use SLAAC, stateful DHCPv6, or stateless DHCPv6.
2
Evaluate the impact of M=0M=0 on address autoconfiguration.
Hosts do not use a stateful DHCPv6 server for IPv6 address assignment; instead, they use Stateless Address Autoconfiguration (SLAAC) to derive their IP address from the network prefix.
M=0M=0 indicates that addresses are not managed by a stateful DHCPv6 server.
3
Evaluate the impact of O=1O=1 on additional network options.
Hosts query a stateless DHCPv6 server for non-address configuration information such as DNS server IP addresses and domain search lists.
O=1O=1 specifies that 'other' configuration details are available via DHCPv6.

Key Concept

IPv6 Router Advertisement (RA) Flags and Autoconfiguration Modes (SLAAC vs. Stateless/Stateful DHCPv6)
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Topics

IPv6 Addressing and Deployment

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