master bushing
kelly slips
kelly bushing
rotary bushing
第1题：
A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame ______.
A.stopper
B.screen
C.filter
D.restrictor
第2题：
You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack？（）
第3题：
A. Statistics collection is not done for the CUSTOMERS table when schema stats are gathered.
B. Statistics collection is not done for the CUSTOMERS table when database stats are gathered.
C. Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.
D. Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.
E. Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
第4题：
When creating a Virtual Ethernet adapter， which of the following steps is done FIRST？（）
第5题：
In an Ethernet network, under what two scenarios can devices transmit?（）
第6题：
第7题：
属于事务控制的语句是（）。
第8题：
A. Traffic addressed to the chassis that requires some form of special handling by the RE before it can be forwarded out an egress port.
B. Traffic that enters an ingress port, is compared against the forwarding table, and is forwarded out an egress port.
C. Any traffic that requires the generation of an ICMP message.
D. Traffic that requires some form of special attention and does not pass through the device.
第9题：
When using Device Manager, a red ‘X” indicates which of the following?（）
第10题：
In which scenario do you use the Flashback Database feature？（）