What methods of network device scanning are you familiar with?

Main methods of scanning network devices that can be used with Python:

1. Ping scanning — checking device availability via ICMP requests.
2. TCP port scanning — attempting to establish TCP connections on specific ports to identify open services.
3. UDP scanning — sending UDP packets to detect open UDP ports.
4. ARP scanning — identifying devices on a local network via ARP requests.
5. SNMP scanning — retrieving information from devices supporting SNMP.

Common libraries used for implementation:

• scapy — for creating and sending various types of packets.
• socket — for low-level network connection handling.
• python-nmap — a wrapper for nmap, a powerful scanning tool.

Example of a simple TCP scanner in Python:

import socket

def scan_port(ip, port):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.settimeout(1)
        try:
            s.connect((ip, port))
            return True
        except:
            return False

ip = '192.168.1.1'
ports = [22, 80, 443]
for port in ports:
    if scan_port(ip, port):
        print(f"Port {port} is open")
    else:
        print(f"Port {port} is closed")