You are managing the Oracle database. Which of the following choices correctly identifies when Oracle reads the contents of the init.ora file?（）
A、When the instance is started
B、When the database is mounted
C、When the database is opened
D、When the database is closed
A new department is formed and a new section of the building is being built out for them. All 50 new employees will need access to the wireless network. Which of the following should be completed to allow these new employees access to the wireless network?（）
A、Frequency settings should be changed
B、Additional WAPs should be installed
C、Channels should be changed
D、VLANs should be added
Which of the following is a performance optimization technology?（）
A、QoS
B、Trunking
C、Spanning
D、VoIP
Evaluate these two SQL statements: SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them? （）
A、The two statements produce identical results.
B、The second statement returns a syntax error.
C、There is no need to specify DESC because the results are sorted in descending order by default.
D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
在线安装蓄电池组输出电缆时，应用仪表测量蓄电池组的总电压和开关电源的输出电压的差值，在电压差小于（）V时，安全接入。
A、0
B、0.5
C、1
D、1.5
Which of the following WAN technologies uses a telephone cable?（）
A、POTS
B、FDDI
C、SONET
D、Cable modem
