Examkin

Question

Difficulty: Very hardIPv6 Addressing and Deployment

An enterprise network engineering team is deploying IPv6 across a new corporate VLAN. The design requirements mandate that client endpoints dynamically auto-configure their Global Unicast Address (GUA) interface identifiers using SLAAC and EUI-64 from the prefix advertised by the local default gateway. Additionally, clients must receive additional network settings—specifically IPv6 DNS server addresses and domain search lists—from a central DHCPv6 server without creating or tracking stateful IPv6 address leases on the DHCPv6 server. During initial deployment verification, client workstations correctly construct their GUA and link-local addresses but fail to receive any DNS configuration from the network. Which Router Advertisement (RA) flag configuration on the local default gateway router interface must be applied to resolve this issue?

  1. Set the Managed Address Configuration flag (M flag) to 0 and the Other Stateful Configuration flag (O flag) to 1 on the router interface.Answer
  2. B
    Set the Managed Address Configuration flag (M flag) to 1 and the Other Stateful Configuration flag (O flag) to 1, while defining the server's DHCPv6 pool range using multiple double-colon zero compressions such as 2001:db8::1::50.
  3. C
    Deploy an IPv6 DNS server and configure a standard DNS A record on the DNS server to map host IPv6 GUAs to hostnames.
  4. D
    Set the Managed Address Configuration flag (M flag) to 1 and the Other Stateful Configuration flag (O flag) to 0, while assigning the host default gateway address to a non-local IPv4 subnet address.

Answer

The local router interface must be configured with the Managed Address Configuration flag (M flag) set to 0 and the Other Stateful Configuration flag (O flag) set to 1.
Stateless DHCPv6 allows client endpoints to auto-configure their own IPv6 Global Unicast Address via SLAAC while contacting a DHCPv6 server for additional network options like DNS. This behavior is enabled on the network segment by sending ICMPv6 Router Advertisements with the Managed Address Configuration flag (M flag) cleared (0) and the Other Stateful Configuration flag (O flag) set (1).

Step-by-Step Solution

1
Analyze the autoconfiguration requirement for host addresses.
Hosts must use SLAAC with EUI-64 to derive their Global Unicast Address from the advertised prefix.
The requirement specifies dynamic self-generation of address interface identifiers without stateful address tracking.
2
Evaluate the Router Advertisement (RA) Managed Address Configuration flag (M flag).
The M flag must be set to 0 (disabled).
An M flag value of 0 signals to client hosts that IPv6 addresses are not available via stateful DHCPv6 and must be acquired through SLAAC.
3
Evaluate the Router Advertisement (RA) Other Stateful Configuration flag (O flag).
The O flag must be set to 1 (enabled).
An O flag value of 1 informs client hosts to use Stateless DHCPv6 to obtain supplementary configuration information (such as DNS server addresses and domain search names) while keeping address generation under SLAAC.

Key Concept

IPv6 Stateless DHCPv6 Configuration via Router Advertisement Flags (M flag = 0, O flag = 1)
Rate this question

Topics

IPv6 Addressing and Deployment

More questions from this topic