For security reasons， an administrator is asked to modify the system to prevent someone from leaving a terminal logged in. To enable a five minute timeout for all users， what would need to be done to accomplish this task？（）

A、Add the following line to /etc/environment：  TMOUT=300

B、Add the following lines to /.profile  TMOUT=5  export TMOUT

C、Execute the following command：  chuser -u ALL -a TIMEOUT=5M

D、Execute the following command：  chsec -u ALL -a TIMEOUT=600

Which form of BGP changes the BGP Next Hop attribute by default?（）

A、IBGP

B、EBGP

C、CBGP

D、MBGP

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.

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.

以下选项中不合法的标识符是（　　）。

A、print

B、FOR

C、&a

D、_00

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