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.  
 
        
             
        
        
        
i think it would be the investment with high risk and high return such as Stocks.When
investing in stock, investor analyze whether a specific company will be
doing well in the time of investment (which will increase the market
price of the stock) and take a profit from it.
        
             
        
        
        
Answer:
We will use script in oracle and SQl(Structured Query Language) and use of algorithms like cipher for encryption to insert a new flight into the flights table for the flight number 165 and that Cipher will show the desired message.
  
        
             
        
        
        
I think you can call it to a Network Switch, but LAN is always used device network: Hubs and Switch or maybe Connect Device or Cable.