SCTP設計的目的是為了提供更快速的而且更可靠的、更多功能性的signaling transfer
因為比起UDP跟TCP來說：
UDP：unreliable、lack of congestion and flow controls
TCP：HOL delay、limited scope、can be attacked (SYN attack)
而SCTP可以提供一個reliable、不會有HOL delay、而且又快、可以使用multi-homed hosts、不會被DoS攻擊(4-way handshake)
＊ 現在的SCTP 提供了哪些功能？
* To ensure reliable, error-free, in-sequence delivery of user messages (optional).─ 可靠性
* To support fast delivery of messages and avoid head-of-line blocking.─ 快，沒有HOL delay
* To support network-level fault tolerance that is critical for carrier-grade network performance by using multi-home hosts.─network layer fault tolerance
* To provide protection against DoS attack by using 4-way handshake and cookies. – 4-way handshake
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