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andriy [413]
3 years ago
12

Which of the selections below represents a recursive query?

Computers and Technology
1 answer:
ElenaW [278]3 years ago
5 0

Answer:

D. A DNS server asks another DNS server to resolve a domain name

Explanation:

DNS (Domain name system) queries are essentially of two types;

i. recursive address resolution

ii. iterative or non-recursive address resolution

=> In the <em>recursive address resolution</em>, which represents a recursive query, when a DNS server A, receives a request from a client and does not know how to resolve such request, the DNS server sends the query to another DNS server B on behalf of this client. DNS server B can either reply to the query with the actual answer or an error message. If it's an actual answer, it returns to the client. Otherwise, it queries another DNS server, say C.

=> In the <em>iterative address resolution</em>, once the DNS server A receives a request from the client, it tries to reply the client with the best answer it can give. If the DNS server A does not have an answer, it refers the client to another DNS server say B. In this case, the server A does not directly query the server B. Instead, it refers the client to the server B.

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Answer:

Here is the program that demonstrates the use of JAVA exception:

import java.util.Scanner;  //to accept input from user

public class Main {  //class name

   public static void main(String[] args) {  //start of main method

      Scanner input = new java.util.Scanner(System.in);  //creates Scanner class object to accept input from user

       int number1 = 0;  //stores the first integer value

       int number2 = 0;  //stores the second integer value

       while(true) {  //keeps looping until user enters integer value

           System.out.println("Enter 2 integers to perform addition: "); //prompts user to enter two integer values

           try {  //defines a chunk of code to check for errors        

               number1 = input.nextInt(); //reads input integer 1

               number2 = input.nextInt(); //reads input integer 2                  

               break;             }  

           catch (java.util.InputMismatchException e) { // defines a code chunk to execute if an error occurs in the try code chunk

              System.out.println("Input must be an integer "); //displays this message if user enters anything other than an integer value

              input.nextLine();              }         }  // reads input from user again until user enters both integer type values

       System.out.println("The sum is: " + (number1+number2));      }  } //if user enters 2 integers then computes and displays the sum of two integer values

Explanation:

The program uses InputMismatchException exception and asks the user to input two integers and computes the sum of two integers if user enters  integers otherwise an exception InputMismatchException is thrown and a error message Input must be an integer is displayed to the user if they input a string of letters instead o f integer values. Here while loop is used which keeps executing until user enters both the integer values. After the user enters correct values, the sum of the two integers are computed and result is displayed on output screen. The screenshot of program and its output is attached.

Another program asks the user to input an integer and the program executes correctly if they enter an integer but exception InputMismatchException is thrown with an error message that is is displayed to the user if they input a string of letters. Here is the program:

import java.util.Scanner;

public class Main {

   public static void main(String[] args) {

       Scanner input = new java.util.Scanner(System.in);

       int number1 = 0;          

       while(true) {

           System.out.println("Enter an integer value: ");        

           try {

               number1 = input.nextInt();  

               break;             }  

           catch (java.util.InputMismatchException e) {

              System.out.println("Input must be an integer ");

              input.nextLine();             }        }  

       System.out.println("The program executed correctly!");  } }

7 0
3 years ago
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