The last one , info is not sparse or little , we have plenty of it
Answer:
A downloaded executable file may contain harmful software know as malware.
Further details:
Malwares:
Malware (a portmanteau for pernicious programming) is any product purposefully intended to make harm a PC, server, customer, or PC network. Malware does the harm after it is embedded or brought somehow or another into an objective's PC and can appear as legitimately executable code, contents, supposed "dynamic substance" (Microsoft Windows), and different types of data. Some sorts of malware are to a great extent alluded to in the media as PC infections, worms, Trojan steeds, ransomware, spyware, adware, and scareware, among different terms. Malware has a malignant expectation, acting against the enthusiasm of the PC client—thus does exclude programming that causes accidental damage because of some lack, which is regularly portrayed as a product bug.
Uses:
Malware is once in a while utilized comprehensively against government or corporate sites to assemble monitored information, or to upset their activity as a rule. However, malware can be utilized against people to pick up data, for example, individual recognizable proof numbers or subtleties, bank or charge card numbers, and passwords.
Answer details:
Subject: Computer and technology
Level: College
Keywords:
• Harmful software
• Malware
• Malware software
• Uses of malware
• Purpose of malware
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Answer: A. passive attacks
Explanation:
Passive attack is a type of attack where by a system is tracked and scanned to determine how vulnerable it is and to also detect open port. The major purpose of a passive attack on a network is to gain access to the information of the target without altering the data.
A passive attack on a network may not be necessarily malicious, it is a type of network attack that is very difficult to detect.
Methods of carrying out passive attacks.
•War driving: scanning of networks is carried out to detect Wi-Fi that are vulnerable.
•Dumpster driving: Attackers or intruders search for information from discarded computers and
other gadgets, those information can help to attack a network.
Answer:
<u>How to implement a stack in C using an array?</u>
A stack is a linear data structure that follows the Last in, First out principle (i.e. the last added elements are removed first).
This abstract data type can be implemented in C in multiple ways. One such way is by using an array.
Pro of using an array:
No extra memory required to store the pointers.
Con of using an array:
The size of the stack is pre-set so it cannot increase or decrease.
Answer:
This is the complete correct program:
#include <stdio.h>
#include<sys/types.h>
#include<unistd.h>
int value = 128;
int main()
{
pid_t pid;
pid=fork();
if (pid==0) /* child process */
{
value +=8;
return 0; }
else if (pid > 0) {/* parent process */
wait (NULL);
printf ("PARENT: value =%d\n" ,value); /* LINEA */
return 0;
}
}
The output of the LINE A is:
PARENT: value = 128
Explanation:
The fork() function used in the program creates a new process and this process is the child process. The child process is same as the original process having its own address space or memory.
In the child process the value of pid is 0. So the if condition checks if pid==0. Then the child process adds 8 to the value of its variable according to the following statement
value +=8;
Now the original process has value = 128. In else if part the parents process has the value of pid greater than zero and this portion of the program is of the parent process :
else if (pid > 0)
{ wait (NULL);
printf ("PARENT: value =%d\n" ,value);
return 0; }
So the value 128 is printed at the end in the output.
wait(NULL) is used to wait for the child process to terminate so the parent process waits untill child process completes.
So the conclusion is that even if the value of the variable pid is changed in the child process but it will not affect the value in the variable of the parent process.
