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IPv6 does not replace TCP and UDP protocols with SCTP. Instead, TCP and UDP remain as the primary transport-layer protocols for IPv6, ensuring backward compatibility with existing applications. SCTP is an additional transport protocol introduced to handle new use cases like multimedia streaming, but it is not mandatory in IPv6. This design decision was intentional to maintain compatibility and provide flexibility. For instance, applications developed for IPv4 networks using TCP/UDP do not need significant changes to operate in an IPv6 environment. IPv6 focuses on expanding address space, enhancing routing efficiency, and improving security while retaining compatibility with existing transport-layer protocols. Why Other Options Are Incorrect :
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