1. We abbreviate Virtual Private Networks to VPN.（ ） A. 错误 B. 正确 ...

14. A （ ） is a highly intelligent device that supports connectivity between both like and unlike LANs,and between LANs and WANs or MANs. A. router B. repeater C. switch D. bridge ...

7. （ ）, type of LAN that combines star, ring, bus networks, and etc. A. Bus network B. Star network C. Ring network D. Hybrid network ...

1. A （ ） channel allows simultaneous message exchange in both directions.It really consists of two simplex channels, a forward channel and a reverse channel,linking the same points. A. half-duplex B. full-duplex C. simplex D. none of...

5. Mouse belongs to output.（ ） A. 错误 B. 正确 ...

20. （ ） is one of the components of the CPU, tells the rest of the computer system how to carry out a program's instructions. A. Control unit B. ALU C. RAM D. ROM ...

13. （ ） is the electronic device that interprets and carries out the basic instructions that operate the computer. A. Processor B. hardware C. memory D. CPU ...

7. （ ） have more storage capacity than diskettes and also offer faster access to the data they hold. A. Hard disks B. Optical disks C. Zip disk D. CD ...

2. （ ） are output devices that print characters, symbols, and graphics on a physical medium such as paper and a transparency file. A. Flat panel monitors B. Printers C. Keyboards D. Pointing device ...

7. 一般情况下，视图名称（ ）与该用户拥有的任何表的名称相同。 A. 不可以 B. 一定能 C. 在某些条件下可以 D. 以上都不对 ...