Discover which IPv6 transition method encapsulates IPv6 packets inside IPv4 packets for compatibility on the CCNA 200-301 exam. Learn why Teredo is the correct answer and how it enables IPv6 connectivity across IPv4-only networks, even behind NAT.
Table of Contents
Question
What IPv6 transition method allows IPv6 packets to be encapsulated inside IPv4 packets for compatibility?
A. Dual Stack
B. NAT64
C. DNS64
D. Teredo
E. EUI-64
Answer
D. Teredo
Explanation
Teredo encapsulates IPv6 packets inside IPv4 to enable IPv6 connectivity across IPv4-only networks.
Teredo is an IPv6 transition technology specifically designed to enable IPv6 connectivity for hosts that reside on IPv4 networks, particularly those behind Network Address Translation (NAT) devices. Teredo achieves this by encapsulating IPv6 packets within IPv4 UDP packets, allowing them to traverse IPv4-only infrastructure and NAT devices seamlessly.
- Encapsulation Process: Teredo wraps IPv6 datagrams inside IPv4 UDP packets. These encapsulated packets can be routed over the IPv4 Internet, including through NAT devices, which typically do not support native IPv6 traffic.
- NAT Traversal: Unlike other tunneling methods (such as 6to4), Teredo is specifically engineered to work even when the client is behind a NAT, a common scenario in many modern networks.
- Components: Teredo uses Teredo servers and relays to facilitate the tunneling and routing of these encapsulated packets between IPv6 and IPv4 networks.
Why the Other Options Are Incorrect:
A. Dual Stack: This method runs both IPv4 and IPv6 protocols simultaneously on network devices but does not encapsulate IPv6 packets inside IPv4 packets.
B. NAT64: This translates IPv6 packets to IPv4 packets and vice versa, rather than encapsulating them.
C. DNS64: This is a DNS-based mechanism that helps IPv6-only clients communicate with IPv4-only servers by synthesizing AAAA records, not encapsulating packets.
E. EUI-64: This is a method for generating IPv6 interface identifiers, not a transition or tunneling mechanism.
Teredo is the IPv6 transition method that allows IPv6 packets to be encapsulated inside IPv4 packets, ensuring compatibility and connectivity across IPv4-only networks, even when NAT is present.
Cisco Certified Network Associate CCNA 200-301 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Network Associate CCNA 200-301 exam and earn Cisco Certified Network Associate CCNA 200-301 certification.