Which of the following statements about Internet routing and protocols is correct?

Question

Which of the following statements about Internet routing and protocols is correct?

1. A. BGP is used primarily for routing within a single local network.
2. B. ICMP is used to encrypt data packets over the Internet.
3. C. IPv6 adoption eliminates the need for NAT because it provides a vastly larger address space. (Correct answer)
4. D. HTTP/3 relies on TCP for faster connections and multiplexing multiple streams.

Correct Answer

Option C — C

Detailed Solution & Explanation

The correct answer is Option C.

Key Points

• IPv6 adoption eliminates the need for NAT because it provides a vastly larger address space.
• NAT (Network Address Translation) exists mainly because IPv4's ~4.3 billion addresses are too few, so many devices share one public IPv4 address. IPv6 offers a practically unlimited address space (2^128), so every device can have its own public address and NAT is no longer needed.

Additional Information

• (A) BGP routes between large networks (autonomous systems) across the internet, not within a single LAN.
• (B) ICMP is for diagnostics/error messages (ping, traceroute), not encryption.
• (D) HTTP/3 runs over QUIC (UDP), not TCP — that is its key change from HTTP/2.

Exam Tip

• IPv4 = 32-bit, IPv6 = 128-bit; NAT is an IPv4 workaround that IPv6 makes unnecessary.