GCIA Fundamentals Of Traffic Analysis Practice Test

Which statement about Teredo is accurate?

It tunnels IPv6 over IPv4 UDP It requires no NATs It uses HTTP for control It tunnels IPv4 over IPv6 TCP

Correct Answer:

It tunnels IPv6 over IPv4 UDP

Explanation:

Teredo provides IPv6 connectivity over an IPv4 network by encapsulating IPv6 packets inside UDP datagrams sent over IPv4. This design lets hosts behind NATs reach the IPv6 Internet without a native IPv6 path, using Teredo servers to help discover the NAT type and Teredo relays to forward traffic to IPv6 destinations. It does not rely on HTTP for control and it does not tunnel IPv4 over IPv6 TCP; the traffic is IPv6 over IPv4 using UDP. So the accurate description is that Teredo tunnels IPv6 over IPv4 UDP.

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