GCIA Question #37: Real Exam Question with Answer & Explanation

The correct answer is C. 6to4. DirectAccess uses 6to4 when the client has a publicly routable IPv4 address, allowing IPv6 traffic to be encapsulated and tunneled over the IPv4 internet.

Question

Which of the following IPv6 transition technologies is used by the DirectAccess if a user is in a remote location and a public IPv4 address, instead of public IPv6 address, has been assigned to the computer?

Options

AISATAP
BPortProxy
C6to4
DTeredo

Explanation

DirectAccess uses 6to4 when the client has a publicly routable IPv4 address, allowing IPv6 traffic to be encapsulated and tunneled over the IPv4 internet.

Common mistakes.

A. ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is designed to transmit IPv6 packets within an intranet over an IPv4 infrastructure, not for external DirectAccess clients with public IPv4 addresses.
B. PortProxy is a Windows netsh command used to forward TCP connections between addresses and ports, not an IPv6 transition or encapsulation technology.
D. Teredo encapsulates IPv6 over UDP to traverse NAT devices, so DirectAccess uses it only when the client is behind NAT with a private IPv4 address, not a public one.

Concept tested. DirectAccess IPv6 transition technology selection (6to4)

Reference. https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/dd637564(v=ws.10)

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