下列哪些对于 “限制性应用协议” （Constrained Application Protocol, CoAP) 的讯息交换 （message exchange) 的方法叙述是错误的 ？A．讯息交换式建构在 TCP 协议上, 有所讯息交换都是可靠的B．讯息交换式建构在 UDP 协议上, 但也提供可靠讯息交换的机制C．可靠交换使用 CON 讯息以及 ACK 讯息D．不可靠交换使用 NON 讯息
下列哪些对于 “限制性应用协议” （Constrained Application Protocol, CoAP) 的讯息交换 （message exchange) 的方法叙述是错误的 ？
A．讯息交换式建构在 TCP 协议上, 有所讯息交换都是可靠的
B．讯息交换式建构在 UDP 协议上, 但也提供可靠讯息交换的机制
C．可靠交换使用 CON 讯息以及 ACK 讯息
D．不可靠交换使用 NON 讯息
参考答案和解析
是针对在限制性节点与限制性网路的环境下设计的网页传输协议 (webtransfer protocol), 用来提供高阶且便利的机器对机器通讯协议;CoAP 协议通讯的方式是”需求/回复” 互动模式;需求端采用 URIs 来表示拟存取的数据标的 (如感测器的温度数据)
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