CCNA Routing and Switching (legacy) — Question 68

Which tunneling mechanism embeds an IPv4 address within an IPv6 address?

Answer options

• A. Teredo
• B. 6to4
• C. 4to6
• D. GRE
• E. ISATAP

Correct answer: B

Explanation

The correct answer is B, 6to4, which is specifically designed to allow IPv6 packets to be transmitted over an IPv4 network by encapsulating the IPv4 address within the IPv6 address. Options A (Teredo) and E (ISATAP) also provide IPv6 connectivity over IPv4 but do not embed the IPv4 address in the same way as 6to4. GRE (D) is a tunneling protocol but does not specifically deal with IPv4 and IPv6 address embedding.