INTERNET SECURITY : Networking Lecture Notes

TOPIC: INTERNET SECURITY What is IPSec? IPSecurity (IPSec) is a collection of protocols designed to provide security at the network layer. Transport mode:  The IPSec header and trailer are added to the information  corning from the transport layer. The IP header is added later. Tunnel mode: It takes an IP packet, including the header, applies IPSec security methods to the entire packet, and then adds a new IP header . What are the protocols associated with IPSec? Authentication Header (AH): provides source authentication and data integrity. The protocol uses a hash function and a symmetric key to create a message digest; Encapsulating...

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Pointers (Lecture Notes) : CUSAT s1s2 Questions

Hi friends,Here I'm posting some important concepts asked in CUSAT B Tech S1 S2 C programming examination. All the concepts are descried here in very briefly so that you can grasp it quickly.Here we go..!!! :)Pointer · Pointer is a variable that represents the location of a data item. · Address operator (&) : It evaluates the address of its operand. · Indirection Operator(*): Used to access data item referenced by a pointer. Example: Main() { Int a=3; Int *ptr; Ptr=&a; Printf(“%d %u” , *ptr, ptr); } Pointer to an array · A pointer can be used to reference an array. · The name...

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SELECTION SORT ~ CUSAT Previous Questions with Answers- C programming.( S1 S2)

Hi friends, Here I'm posting a C program implementing Selection sort. It is specially dedicated to S1 S2 B tech students because Selection sort is one of the most frequently asking questions in "Computer  Programming" exams. Hope this will be Useful  4  you.!!! :) #include<stdio.h> #include<conio.h> void main() { clrscr(); int n,i,j,temp,a[50];  printf("\nEnter how many elements="); scanf("%d",&n);  printf("\nEnter %d elements",n);// Input the elements for(i=0;i<n;i++) { scanf("%d",&a[i]); }  for(i=0;i<n-1;i++)// Sorting the elements { for(j=i+1;j<n;j++) { if(a[i]>a[j]) { temp=a[j]; a[j]=a[i]; a[i]=temp; } } } printf("\nSorted...

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CUSAT Previous Questions with Answers- C programming.( S1 S2)

Hi Friends, here I'm posting one of the frequently asking question in CUSAT B tech C programming ( s 1 s2 ) and its solution: Question: Write a C program which prints all Armstrong numbers between 1 and 1000. Solution: #include<stdio.h> main() { int number, temp, digit=0, dup; printf("Printing all Armstrong numbers between 1 and 500:\n\n"); number = 1; while (number <= 500) { temp=0; dup=number; while(dup>0) { digit=dup%10; temp+=(digit*digit*digit); dup=dup/10; } if (temp==number) { printf("\nAmstrong Number:%d", temp); } number++; } getch(); } &nbs...

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