<span>a group or system of interconnected people or things</span>
Answer:
Follows are the matching to this question:

Explanation:
While time-consuming or prone to errors mechanical adjustments to both the referential, databases could be configured with four measures to engine violations. The restricted action causes the insert, update, and removes to only be denied. Set Null to NULL sets the invalid external key, whereas Set Default to a specific core consideration specified in SQL sets a default foreign key. Its Cascade operation spreads the main changes in external keys.
Answer: DMZ
Explanation:
DMZ is the demilitarized zone network and it is use in providing he various services to the users or customers by using the public internet. It basically contain organizational services in the logical and physical sub-network and usually works in large network.
The main purpose of DMZ that it is use as web server over the internet for reaching to the users and customers. It also add one additional layer in the organization for security purpose.
Some of the services that DMZ provides as web server, DNS and proxy server.
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