ARP协议的功能是()。
A、由目标的IP地址求目标的MAC地址
B、由目标的MAC地址求目标的IP地址
C、由源的IP地址求源的MAC地址
D、由源的MAC地址求源的IP地址
In your database, the LDAP_DIRECTORY_SYSAUTH initialization parameter has been set to YES and the users who need to access the database as DBAs have been granted SYSDBA enterprise role in Oracle Internet Directory (OID). SSL and the password file have been configured. A user SCOTT with the SYSDBA privilege tries to connect to the database instance from a remote machine using the command: Which authentication method would be used first?()
A、 authentication by password file
B、 authentication by using certificates over SSL
C、 authentication by using the Oracle Internet Directory
D、 authentication by using the local OS of the database server
EXCEL图表是动态的,当在图表中修改了数据系列的值,与图表相关的工作表中的数据()
A、出现错误值
B、不变
C、自动修改
D、用特殊颜色显示
简述线程的生命周期,重点注意线程阻塞的几种情况,以及如何重回就绪状态。
10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } 16. class Sales extends Employee { 17. // insert method here 18. } Which two methods, inserted independently at line 17, correctly complete the Sales class?()
Adouble getSalesAmount() { return 1230.45; }
Bpublic double getSalesAmount() { return 1230.45; }
Cprivate double getSalesAmount() { return 1230.45; }
Dprotected double getSalesAmount() { return 1230.45; }
Which two statements are true regarding an Ethernet collision domain?()
AIf a switch is used, the collision domain is limited to each device and the switch.
BIf a hub is used, the collision domain is limited to each device and the hub.
CIf a hub is used, the collision domain includes all devices connected to the hub.
DIf a switch is used, the collision domain includes all devices connected to the switch.