You need to control SSH, HTTP, and Telnet access to an MX240 router through any interface.You have decided to use a firewall filter.How should you apply the firewall filter?（）

A、as an outbound filter on interface fxp0

B、as an outbound filter on interface lo0

C、as an inbound filter on interface fxp0

D、as an inbound filter on interface lo0

Which two statements are true regarding an Ethernet collision domain?（）

If a switch is used, the collision domain is limited to each device and the switch.

If a hub is used, the collision domain is limited to each device and the hub.

If a hub is used, the collision domain includes all devices connected to the hub.

If a switch is used, the collision domain includes all devices connected to the switch.

In your database, the flash recovery area (FRA) is configured as the default for RMAN backups. You executed the following commands to configure the settings in RMAN: Which statement is true about the outcome?（）

A、 Only one channel is allocated and the backup is created in the flash recovery area

B、 Only one channel is allocated and the backup is created in the destination specified for channel

C、 Two channels are allocated and backup sets are created in the destinations specified for channels 1 and 2

D、 Three channels are allocated and backup sets are created in the destinations specified for channels 1, 2, and FRA

以下哪个选项的仪器在验收过程中不需携带。（）

A、手提电脑

B、竣工文件

C、卷尺

D、望远镜

EXCEL图表是动态的，当在图表中修改了数据系列的值，与图表相关的工作表中的数据（）

A、出现错误值

B、不变

C、自动修改

D、用特殊颜色显示

ARP协议的功能是（）。

A、由目标的IP地址求目标的MAC地址

B、由目标的MAC地址求目标的IP地址

C、由源的IP地址求源的MAC地址

D、由源的MAC地址求源的IP地址