Describe the qmail program.
What will be an ideal response?
The qmail program, written by Dan Bernstein, is a fast, modular mail transfer agent (MTA) designed to be lightweight, secure, and reliable. Unlike sendmail, qmail was designed with security and ease of use in mind, which makes it easier to configure (such as allowing multiple domains). Multiple modules, each no bigger than 30 KB, handle qmail's MTA functions.
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Answer the following statements true (T) or false (F)
1. An iteration structure is always needed to process a menu selection made by a user. 2. An If-Then-Else statement can be used as one way to process a user's menu selection. 3. The user's menu selection can be validated using an input validation loop immediately after the input statements. 4. It is never possible to give a user a chance to make more than one selection without re-running the whole program.
Each of the following lines of code purport to round the results of the division of doubles to the nearest integer value (but still of type double). All are correct C++ code but some do not round correctly. Tell which rounds down, up, or to the nearest integer value, or is not reasonable Assume that math.h has been included, and that all variables have appropriate values.
double x, y, z; a) ``` z = ceil(x/y);a) ``` b) ``` z = ceil(x/y-0.5); ``` c) ``` z = floor(x/y-0.5); ``` d) ``` z = floor(x/y+0.5); ``` e)``` z = floor(x/y); ```
The AVERAGE function CANNOT calculate the arithmetic mean or average of values in a range
Indicate whether the statement is true or false
Match each term with the correct statement below.
A. Originally designed for UNIX environments for point-to-point communications among computers, servers, and hosts using TCP/IP B. A starting-to-ending-point encryption technique that uses special encryption keys varying in length from 40 to 128 bits C. A WAN communications technology that relies on packet switching and virtual connection techniques to transmit at rates from 56 Kbps to 45 Mbps D. Like a tunnel through a larger network-such as the Internet, an enterprise network, or both-that is restricted to designated member clients only E. Encapsulates the data packet in the Hypertext Transfer Protocol (HTTP) used through Web communications F. A technology that uses advanced modulation techniques on regular telephone lines for high-speed networking at speeds of up to about 52 Mbps between subscribers and a telecommunications company G. A dedicated leased telephone line that can be used for data communications over multiple channels for speeds of up to 400.352 Mbps H. A data encryption technique employed between a server and a client, such as between a client's browser and an Internet server I. Can automatically negotiate communications with several network communications layers at once