350-501 Question #385: Real Exam Question with Answer & Explanation

Question

What are two features of 6RD IPv6 transition mechanism? (Choose two.)

Options

• AIt inserts IPv4 bits into an IPv6 delegated prefix.
• BIt uses a native IPv6-routed network between CE routers and the BR router.
• CIt allows dynamic 1:N translation of IPv6 address.
• DIt uses stateful automatic 6to4 tunnels between CE routers and the BR router.
• EIt uses stateless automatic 6to4 tunnels between CE routers and the BR router.

Explanation

6RD (IPv6 Rapid Deployment) is a stateless IPv6 transition mechanism that embeds a customer's IPv4 address within a delegated IPv6 prefix, enabling stateless tunneling of IPv6 packets over an IPv4 infrastructure.

Common mistakes.

• B. 6RD is designed to operate over an existing IPv4 network between the customer edge (CE) router and the border relay (BR) router, not a native IPv6-routed network.
• C. 6RD provides a 1:1 mapping between a customer's public IPv4 address and a block of IPv6 addresses, not a dynamic 1:N translation.
• D. 6RD (like 6to4) is a stateless tunneling mechanism, meaning it does not maintain per-flow state information like stateful NAT64 would.

Concept tested. IPv6 6RD transition mechanism features

Reference. https://datatracker.ietf.org/doc/html/rfc5569

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