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DNS and DNS Types

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DNS Purpose The Domain Name System will be used for identifying the IP address of the website. How DNS Work? The DNS will work on converting the domain name of the website into an IP address inside the operating system. Diagram DNS queries DNS Query is known as the DNS request where it is used to send the request of the DNS by the user which is the DNS client to a DNS server. - Request of information (website) from the user PC to the server. Recursive Recursive query is when the DNS client is requesting the domain name, and then the DNS server will either respond an appropriate records of website or error messages if its not found. - Direct-responds - the client request and server respond immediately. Iterative  Iterative query is when the DNS client is requesting the domain name, and then the DNS server will respond the most appropriate resource for the client. - Responds answer (website) without querying other DNS server. - Request the domain name ...
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Data Validation

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Code # Name: Muhamad Raziq Aiman bin Haji Rosman # Version: Python 3 # Date: 24 January 2018 validcharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ " while True : var1 = input ( "Enter your name:" ) if all (char in validcharacters for char in var1): print ( "Your name is " + var1) break print ( "That's invalid, please try again. Please enter characters A-Z and space only" ) def input_number (message): while True : try : userInput = int ( input (message)) except ValueError : print ( "Not an integer! Try again." ) continue else : return userInput break age = input_number( "How old are you?" ) print ( "You are " + str (age) + " years old" ) Output
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