【单选题】【消耗次数：1】
在TCP/IP协议簇中，（）协议属于网络层的无连接协议。
①
IP
②
SMTP
③
UDP
④
TCP
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在TCP/IP协议中，论述正确的有：（ ）。
①
TCP是面向连接的协议
②
UDP是非面向连接的协议
③
ARP是完成物理地址到IP地址的转换
④
RARP是实现物理地址到IP地址转换的协议
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calls for
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look round
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pains her
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hysterious
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①
in her honor
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on her honor
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①
sharp
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④
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