[单选题] Whereas a repeater operates only in the physical layer of the OSI model,a bridge operates in both the physical layer and the()laye r of the OSI model.

1、[单选题]The software that controls the interaction between the input and output hardware is called BIOS,which stands of()

• A、Classic Input Output System
• B、Junior Input Output System
• C、Advanced Input Output System
• D、Basic Input Output System

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2、[多选题]A virus is a program that reproduces its own code by().

• A、inserting into the middle of a file
• B、adding to the end of a file
• C、simply placing a pointer
• D、replacing another program

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3、[多选题]The World Wide Web also subsumes previous Internet information s ystems such as().

• A、Gopher
• B、Telnet
• C、Ftp
• D、FTP

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4、[多选题]which is the threat to computer security in the following choices?

• A、Computer Criminals
• B、Computer Crime
• C、earthquake
• D、Human Errors

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5、[多选题]Security is usually enforced through().

• A、auditing
• B、encryption
• C、access control
• D、data storing
• E、data retrieving

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