Editing Network Security (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'Firewall Logic' (Filtering Traffic):'''
<syntaxhighlight lang="python">
def firewall_check(ip_address, port, is_encrypted):
    """
    A simple rule-based packet filter.
    """
    allowed_ports = [80, 443, 22]
    blocked_ips = ["192.168.1.50", "10.0.0.99"]
    
    if ip_address in blocked_ips:
        return "BLOCK: Source IP is on the Blacklist."
    
    if port not in allowed_ports:
        return f"BLOCK: Port {port} is closed for security."
        
    if port == 80 and not is_encrypted:
        return "WARNING: Allowing unencrypted web traffic (HTTP)."
        
    return "ALLOW: Traffic matches security policy."

# Testing a suspicious request
print(firewall_check("192.168.1.50", 443, True))
# This is how firewalls protect your home and business 
# from thousands of 'knocks' per day.
</syntaxhighlight>

; Security Landmarks
: '''The Morris Worm (1988)''' → The first major internet worm, which showed how a single bug could crash 10% of the early internet.
: '''Stuxnet''' → A sophisticated cyber-weapon that used network security flaws to physically destroy nuclear centrifuges.
: '''HTTPS Everywhere''' → The global movement that made encryption the default for all web traffic.
: '''Wi-Fi Security (WPA3)''' → The latest standard for protecting wireless networks from "Packet Sniffing" and password cracking.
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