You'll need a helper variable for this, so depending on your programming language, the solution becomes:
int helper;
helper = arr[i];
arr[i] = arr[j];
arr[j] = helper;
Answer:
Internet Control Message Protocol (ICMP) Echo Requests
Explanation:
A system that has Windows Firewall or antivirus or other third party antivirus enabled with their configuration setting set to default, ping command from another device will not be able to see if the device with an enabled firewall is alive.
The ping command sends Internet Control Message Protocol (ICMP) Echo Request to a destination device after the destination device will reply with a Reply packet. However, by default, firewalls, such as Windows firewall blocks ICMP Echo Requests from the external network and pinging will work when the firewall is disabled or an exception is created that lets ICMP Echo Requests pass through the firewall.
Answer: Zombies
Explanation: Zombie is a computer device that is responsible for the compromising the system and making it prone to several destruction such as the Trojan horse virus,hackers and other viruses as well. Zombie makes the computer system to get malfunctioned easily ,that is without much security and various malicious functions can be performed.They basically act as the infected computer .
