LFCS Question #61: Real Exam Question with Answer & Explanation

Question

Which of the following is true about IPv6?

Options

• AWith IPv6, the TCP port numbers of most services have changed.
• BIPv6 no longer supports broadcast addresses.
• CIPv4 addresses can be used without any change with IPv6.
• DIPv6 no longer supports multicast addresses.
• EFor IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.

Explanation

IPv6 deprecates broadcast addresses, replacing their functionality with more efficient multicast addressing for delivering data to multiple hosts.

Common mistakes.

• A. TCP port numbers are a layer 4 concept and remain unchanged with the adoption of IPv6, which operates at layer 3.
• C. IPv4 addresses are 32-bit and cannot be used directly with 128-bit IPv6; specific transition mechanisms like tunneling or dual-stack are required.
• D. IPv6 extensively uses and enhances multicast addresses, making them a fundamental part of its addressing scheme, not removing them.
• E. UDP and TCP are transport layer protocols and are fully supported and unchanged by IPv6, which is a network layer protocol.

Concept tested. IPv6 addressing and protocol changes

Reference. https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipv6/ipv6-overview

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