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2009-04-10 09:13:11
随着电气电子技术的发展，家用电器产品日益普及和电子化，广播电视、邮电通讯和计算机网络的日益发达，电磁环境日益复杂和恶化，使得电气电子产品的电磁兼容性(EMC电磁干扰EMI与电磁抗EMS)问题也受到各国政府和生产企业的日益重视。电子、电器产品的电磁兼容性（）是一项非常重要的质量指标，它不仅关系到产品本身的工作可靠性和使用安全性，而且还可能影响到其他设备和系统的正常工作，关系到电磁环境的保护问题。
(电磁兼容性)的全称是Electro Magnetic Compatibility，其定义为“设备和系统在其电磁环境中能正常工作且不对环境中任何事物构成不能承受的电磁骚扰的能力” 该定义包含两个方面的意思，首先，该设备应能在一定的电磁环境下正常工作，即该设备应具备一定的电磁抗扰度(EMS)；其次，该设备自身产生的电磁骚扰不能对其他电子产品产生过大的影响，即电磁骚扰(EMI)。
欧共体政府规定，从1996年1月1起，所有电气电子产品必须通过EMC认证，加贴CE标志后才能在欧共体市场上销售。此举在世界上引起广泛影响，各国政府纷纷采取措施，对电气电子产品的RMC性能实行强制性管理。国际上比较有影响的，例如欧盟89/336/EEC指令（即EMC指令）、美国联邦法典 CFR 47/FCC Rules等都对电磁兼容认证提出了明确的要求。
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1. Which NetWorker command can be used to find out the dates that a specific save set has been backed up?
A.mminfo
B.mmls
C.nsrinfo
D.nsrls
Answer: A
2. You are designing a backup schedule for a file system that changes frequently.
Which NetWorker weekly backup schedule results in the fastest recovery?
A.Full incr incr incr incr incr incr
B.Full 1 2 3 4 5 6
C.Full 4 7 4 7 4 7
D.Full 8 8 8 8 8 8
Answer: D
3. Which NetWorker server daemon is responsible for starting other server and storage node daemons?
A.nsrd
B.nsrjobd
C.nsrmmdbd
D.nsrmmgd
Answer: A
4. You want to make sure that only NetWorker Server S1 can back up client C1's data. What do you need
to do?
A.Add C1 to /nsr/res file on the NetWorker Server S1
B.Add C1 to /nsr/res/clients file on the NetWorker Server S1
C.Add S1 to /nsr/res/permissions on the client machine C1
D.Add S1 to /nsr/res/servers file on the client machine C1
Answer: D
5. You noticed that a full level save set is still browsable even after its browse time has expired. What
could be the cause?
A.A clone of the save set exists and has a longer retention period
B.Incremental save sets depending upon this full save set are still
browsable
C.The volume containing the save set is still browsable
D.There was a read error on the volume containing the save set, giving it
a "suspect" status
Answer: B
6. The status of a volume was prematurely set to full. Which command can be used to change the status
of the volume to continue writing to it?
A.jbedit
B.mminfo
C.nsrck
D.nsrmm
Answer: D
7. You are designing a solution for a customer using NetWorker and PowerSnap, to create and back up
copy on write (CoW) snapshots of a STD device on a DMX3
accessed from a Solaris 9 application host.
The STD volume size is 300 GB with a change rate of 10%.
What is the minimum VDEV (Virtual Device) size needed?
A.30 GB
B.270 GB
C.300 GB
D.330 GB
Answer: C
8. Which NetWorker Management Console server daemon acts as a mini web server and responds to the
initial http request from console clients?
A.dbsrv9
B.gstd
C.gsttclsh
D.nsrd
Answer: C
