What Internet Protocol version 6 (IPv6) transition method involves encapsulating IPv6 packets within IPv4 headers to carry them over IPv4 routing systems?

What Internet Protocol version 6 (IPv6) transition method involves encapsulating IPv6 packets within IPv4 headers to carry them over IPv4 routing systems?

• A. Dual Internet Protocol (IP) layer
• B. IPv4 compatible IPv6 addresses
• C. Automatically tunneling of IPv6 over IPv4
• D. Configured tunneling of IPv6 over IPv4

Answer: (D)

The correct method for encapsulating IPv6 packets within IPv4 headers to facilitate their transport over IPv4 routing systems is configured tunneling of IPv6 over IPv4. This technique involves setting up a tunnel that explicitly manages the encapsulation and routing of the IPv6 packets through an IPv4 infrastructure, allowing for a seamless transition to IPv6 networks without requiring changes to the underlying IPv4 transport layer. Configured tunneling typically requires the establishment of endpoints that know how to handle the encapsulated data, allowing for greater control and customization in how traffic is managed. This can be advantageous in networks that require specific routing configurations or need to enforce security policies. In contrast, the other methods listed—such as dual IP layer, IPv4 compatible IPv6 addresses, and automatically tunneling—represent different approaches to addressing the issues of transitioning from IPv4 to IPv6, but they do not specifically describe the encapsulation of IPv6 packets within IPv4 headers for transport over existing IPv4 networks. Each serves unique purposes within transition strategies but doesn't align with what configured tunneling achieves.

The correct method for encapsulating IPv6 packets within IPv4 headers to facilitate their transport over IPv4 routing systems is configured tunneling of IPv6 over IPv4. This technique involves setting up a tunnel that explicitly manages the encapsulation and routing of the IPv6 packets through an IPv4 infrastructure, allowing for a seamless transition to IPv6 networks without requiring changes to the underlying IPv4 transport layer.

Configured tunneling typically requires the establishment of endpoints that know how to handle the encapsulated data, allowing for greater control and customization in how traffic is managed. This can be advantageous in networks that require specific routing configurations or need to enforce security policies.

In contrast, the other methods listed—such as dual IP layer, IPv4 compatible IPv6 addresses, and automatically tunneling—represent different approaches to addressing the issues of transitioning from IPv4 to IPv6, but they do not specifically describe the encapsulation of IPv6 packets within IPv4 headers for transport over existing IPv4 networks. Each serves unique purposes within transition strategies but doesn't align with what configured tunneling achieves.