Answer:
1. DMZ (Demilitarized zone)
Explanation:
In computer networking, a Demilitarized Zone is a physical or logical network designed to give an extra layer of security on the organization’s private network. The DMZ acts as an interface between an untrusted network such as the internet and the organization’s internal network. When a server is set up in a demilitarized zone, users can reach it via its public IP address. In case there is an attack on the server, the private network is still protected.
Answer:
Explanation:
More data storage will become available currently there are kilobytes (KB), megabytes (MB), gigabytes (GB) and terabytes (1TB) of storage but in the future maybe there will be tetrabytes
<u>Purposes of finder </u>:-
It allows the user to do the following mentioned (below) jobs such as:
1) It provides interference in
•coping •moving •deleting etc.
2) It is also associated in the acts of openings and navigation of:
•folders •files
3) Moreover, it can also move windows anywhere on the desktop.
4) Finder is also beneficial in a way that it is capable of revealing different elements and materials or softwares like:
•Storage devices
•Applications
•Files and folders etc
Answer:
Given that: Design scenario - page 197 has a continuation of the chapter 1 design scenario for ElectroMyCycle
Explanation:
See attached image
Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator 
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
