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OLEGan [10]
3 years ago
6

You have a MySQL database running on an EC2 instance in a private subnet. You can connect via SSH, but you are unable to apply u

pdates to the database server via the NAT instance. What might you do to remedy this problem?
Computers and Technology
1 answer:
AnnZ [28]3 years ago
5 0

Answer:

Ensure that "Source/Destination Checks" is disabled on the NAT instance.

Explanation:

A NAT (Network Address Translation) instance is, like a bastion host, an EC2 instance that lives in your public subnet. A NAT instance, however, allows your private instances outgoing connectivity to the internet while at the same time blocking inbound traffic from the internet.

Many people configure their NAT instances to allow private instances to access the internet for important operating system updates. Patching your OS is an important part of maintaining instance level security.

NAT device enables instances in a private subnet to connect to the Internet or other AWS services, but prevents the Internet from initiating connections with the instances.

NAT devices do not support IPv6 traffic, use an egress-only Internet gateway instead.

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How do you return a value from a function?
rjkz [21]

Answer:

return instruction used to return a value from a function.

Explanation:

Function is a block of statement which perform the special task.

Syntax for define a function:

type name(parameter_1, parameter_2,...)

{

  statement;

return variable;

}

In the syntax, type define the return type of the function. It can be int, float, double and also array as well. Function can return the array as well.

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3 years ago
Implement a sublinear running time complexity recursive function in Java public static long exponentiation (long x, int n) to ca
Archy [21]

Answer:

Following are the code block in the Java Programming Language.

//define recursive function

public static long exponentiation(long x, int n) {

//check the integer variable is equal to the 0.

if (x == 0) {

//then, return 1

return 1;

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//Otherwise, set else

else {

//set long data type variable

long q = exponentiation(x, n/2);

q *= q;

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//return the variable

return q;

}

}

Explanation:

<u>Following are the description of the code block</u>.

  • Firstly, we define the long data type recursive function.
  • Then, set the if conditional statement and return the value 1.
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circular_prime A number is called a circular prime if all rotations of its digits form a prime. For example, the number 197 is a
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Answer:

function out=circular_primes(no)

prim=primes(no);% find the all prime number till the given number

pr=0;

nos=[];

po=[];

for p=1:length(prim)

   n=prim(p); % picking up each prime no one by one

   n=num2str(n);% change into string for rotation of no

   d=length(n); % length of string

   if d>1          % take nos greater than 10 beacuase below 10 no need for rotation

       for h=1:d

           a=n(1);

           for r=1:d % for rotation right to left

               if r==d  5 % for the last element of string

                   n(d)=a;

               else

               n(r)=n(r+1); %shifting

               end

           end

           

       s=str2num(n); % string to number

       nos=[nos,s]; % store rotated elements in array

       end

       if nos(end)==no   %if given no is also a circular prime we need smaller

           break;

       end

       for gr=1:length(nos) % checking rotated nos are prime or not

           p1=isprime(nos(gr));

           po=[po,p1];    %storing logical result in array

       end

           if sum(po(:))==length(nos) %if all are prime the length and sum are must be equal

               

               pr=pr+1;

               out=pr;

           else

               out=pr;

           end

       po=[];

       nos=[];

   else  

       s=str2num(n); %numbers less than 10

       f=isprime(s);

       if f==1

           pr=pr+1;

           out=pr;

       else

           out=pr;

       end

   end

       

      end

end

Explanation:

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