单项选择题
Which of the following will cause a ghost image on a printout?（）
A. Problem with the developing drum
B. Problem with the formatter board
C. Worn pickup rollers
D. Scanner unit is defective
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Which of the following commands would a technician use to view the active applicationconnections on a local PC to the network?（）
A.ipconfig
B.netstat
C.nslookup
D.net use -
单项选择题
Which of the following protocols uses port 443 by default?（）
A.LDAP
B.SNMP
C.HTTPS
D.HTTP -
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A user has discovered that even though they are using the latest version of the anti-virus software,the computer is still being infected by a virus. Which of the following is the BEST solution for this problem?（）
A. Replace the computer.
B. Run chkdsk /f.
C. Update the virus signatures.
D. Run scandisk.
