What protocols used by nmap Difference between public and private ip ( mention ip ranges) Command to check connected devices , open and filter port in nmap How firewall works, can we close firewall port ? How ping scan work? Can we close port for icmp?

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Answering questions related to nmap, IP addresses, firewall, and ping scan.

Nmap uses various protocols such as TCP, UDP, ICMP, and ARP.
Public IP addresses are globally unique and routable on the internet, while private IP addresses are used within a private network and not routable on the internet. Private IP ranges include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
To check connected devices and open ports, use the command 'nmap -sP ' and 'nmap -p ', respectively. To filter ports, use the command 'nmap -p -sS '.
Firewalls work by filtering incoming and outgoing network traffic based on predefined rules. Firewall ports can be closed, but it is not recommended to close all ports as it can affect network functionality.
Ping scan works by sending ICMP echo requests to a target IP address and waiting for a response. If a response is received, the target is considered online.
ICMP ports can be closed, but it is not recommended as it can affect network functionality.

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What protocols used by nmap Difference between public and private ip ( mention ip ranges) Command to check connected devices , open and filter port in nmap How firewall works, can we close firewall port ? How ping scan work? Can we close port for icmp?

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