Which three statements about RSTP are true?（）
A. RSTP significantly reduces topology reconverging time after a link failure.
B. RSTP expends the STP port roles by adding the alternate and backup roles.
C. RSTP port satates are blocking,discarding,learing,or forwarding.
D. RSTP also uses the STP proprsal-agreement sequence.
E. RSTP use the same timer-baseed process as STP on point-to-point links.
F. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
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You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 is configured as an enterprise root certification authority (CA). You need to back up the CA's database and log files. You must achieve this goal by using the minimum amount of disk space. What should you run? （）
A. Certreq.exe by using the –new parameter
B. Certutil.exe by using the -backup parameter
Cipher.exe by using the /k parameter
D. Ntbackup.exe by using the systemstate parameter
下列选项中选出获取Photoshop联机帮助的方法有（）
A. 通过双击工具条顶端的小图标
B. 通过按下F1键
C. 通过杳看相关书籍
D. 通过帮助菜单
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