# זיהוי DNS tunneling — subdomains חריג בארוכים
import dns.resolver

def check_suspicious_dns(domain: str) -> bool:
    subdomains = domain.split('.')
    # subdomain ארוך מ-30 תווים חשוד
    for sub in subdomains[:-2]:
        if len(sub) > 30:
            return True
    # entropy גבוה מרמז על encoded data
    import math
    freq = {c: domain.count(c) for c in set(domain)}
    entropy = -sum(f/len(domain) * math.log2(f/len(domain)) for f in freq.values())
    return entropy > 4.0

Network Security Fundamentals — OSI, TCP/IP, Firewalls

Network Security Fundamentals — OSI, TCP/IP, Firewalls

Network Security Fundamentals — OSI, TCP/IP, Firewalls