A firewall is a(68)system designed to(69)all organization, s network against threats.A．operatingB．programmingC．securityD．service

● Every valid character in a computer that uses even（66） must always have an even number of 1 bits.

● The maximum number of data that can be expressed by 8 bits is（67） .

● Integration （68） is the process of verifying that the components of a system work together as described in the program design and system design specifications.

● GIF files are limited to a maximum of 8 bits/pixel, it simply means that no more than 256 colors are allowed in （69） .

● Computer （70） is a complex consisting of two or more connected computing units, it is used for the purpose of data communication and resource sharing.

（66）

A. parity

B. check

C. test

D. compare

（67）

A. 64

B. 128

C. 255

D. 256

（68）

A. trying

B. testing

C. checking

D. coding

（69）

A. an image

B. a file

C. a window

D. a page

（70）

A. storage

B. device

C. processor

D. network

Because Web servers are platform. and application(66), they can send or request data from legacy or external applications including databases. All replies, once converted into(67)mark - up language, can then be transmitted to a(68). Used in this way, Intranets can(69)lower desktop support costs, easy links with legacy applications and databases and,(70)all, ease of use.

A．coupled

B．dependent

C．independent

D．related

Communication protocols are(66)connection-oriented or connectionless,(67)whether the sender of a message needs to contact and maintain a dialog with the recipient or(68)send a message without any, prior connect and with the hope that the recipient receives everything.(69).These methods(70)the two ways that communication is implemented on networks.

A．not

B．neither

C．either

D．all

Some of the keys have a special use. There are referred to as command keys. The 3 most common are the Control or(66), Alternate or(67)and the Shift keys though there can be more(the Windows key for example or the Command key). Each key on a standard keyboard has one or two characters. Press the key to get the lower character and hold Shift to get the upper. Disk Drives - All(68)need a drive to get information off - or(69)- and put information on the disk - or(70). Each drive is designed for a specific type of disk whether it is a CD, DVD, hard disk or floppy. Often the term 'disk'and 'drive'are used to describe the same thing but it helps to understand that the disk is the storage device which contains computer files-or software - and the drive is the mechanism that runs the disk.

A．CON

B．CTRL

C．COTL

D．CTR