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== 5. UDP in Network Scanning and Analysis == UDP behavior differs from TCP during scanning: ; When scanning a closed UDP port: : The system may reply with an ICMP "Port Unreachable" message (Type 3, Code 3). ; When scanning an open UDP port: : Typically no response is returned, which forces scanners to rely on timeouts. ; Tools commonly used: * `nmap -sU` β performs UDP port scans * `netcat -u` β sends custom UDP packets * `hping3 --udp` β crafts and sends raw UDP traffic * `Wireshark` β captures and decodes UDP-based traffic
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