An administrator needs to implement a security patch policy on the network that adheres to aninternal SLA. Which of the following actions BEST achieves this task？（）
A、 Define a test server group， install the patches and if successful schedule installation on production servers.
B、 Define a test server group， schedule installation on production servers and then install all updates and patches.
C、 Install the patches during a non-working hour.
D、 Send an email to all company users and request the best time for installation.
RIP有几个版本？它是基于什么路由算法，最大跳数为几跳.（）
A、2链路状态16
B、1链路状态15
C、2距离向量15
D、1距离向量16
You issue the ping interface t1-1/1/0 1.1.1.1 bypass-routing count 1000 rapid command.Which statement is correct?（）
A、The bypass-routing parameter is used to test the density on the T1 line
B、The bypass-routing parameter cannot be used on a T1 interface
C、The bypass-routing parameter allows you to ping a host through an interface that has no route through it
D、The bypass-routing parameter allows you to ping a local WAN interface without generating any outbound traffic
在任何时候，工作表中（）单元格是激活的（即当前单元格）。
A、有两个
B、有且仅有一个
C、可以有一个以上
D、至少有一个
Which three are well-known mandatory BGP attributes? （）
AOrigin
BAS path
CNext hop
DCommunity
EMultiple exit discriminator
According to JUNOS software route selection algorithm, which IS-IS route type is most preferred?（）
A、Level 1 internal routes
B、Level 1 external routes
C、Level 2 internal routes
D、Level 2 external routes