What is the role of route preference?（）

A、It is used as a tie breaker when the same prefix is available through multiple sources

B、It is used to determine which routes to accept into the routing table

C、It is used to select the best route between multiple equal-cost paths

D、It is used to select which routing table to use for forwarding

Referring to the exhibit, which statement is correct?（）

A、 The packets have exceeded the time-to-live value

B、 There is a loop

C、 The asterisks indicate a response time out

D、 The asterisks indicate that the traceroute is completed.

（）像表一样由列组成，其查询方式与表相同，但是不包含数据。

A、同义词

B、视图

C、索引

D、过程

Which directory does the Junos OS use to store syslog information by default?（）

A、A/ar/messages

B、A/ar/syslog

C、/var/tmp

D、/var/log

Given the following scripts， what output would be generated？（）

A、 The sky is red.

B、 The sky is blue.

C、 The sky is green.

D、 The sky is yellow.

以下选项中不合法的标识符是（　　）。

A、print

B、FOR

C、&a

D、_00