（）协议实现了IP地址与MAC地址之间的转换。 ["ARP","HTTP","FTP","IP"]
通常情况下，问卷的问题类型主要有三种：开放式问题、封闭式问题以及（）。
证券交易所
团结大陆范围外台湾同胞、港澳同胞和海外侨胞而形成的爱国统一战线，其政治基础是（）。 ["爱国主义","拥护党的领导","国际主义","拥护祖国统一","社会主义"]
In a lab, R1 connects to R2, which connects to R3. R1 and R2 each have several working interfaces, all assigned addresses in class A network 10.0.0.0. Router R3 has some working interfaces in class A net work 10.0.0.0, and others in class B network 172.16.0.0. The engineer experiments with the auto -summary command on R2 and R3, enabling and disabling the command in various combinations. Which of the following combinations will result in R1 seeing a rout e for 172.16.0.0/16, instead of the individual subnets of class B network 172.16.0.0?（） [" auto - summary on R2 and no auto - summary on R3"," auto - summary on R2 and auto - summary on R3"," no auto -summary on R2 and no auto- summary on R3"," no auto - summary on R2 and auto - summary on R3"]
生态学
