Network Scanning & Enumeration: Nmap, Ports, SMB, DNS & More

Before attackers can exploit a system, they first need to understand what they're dealing with. In this episode of Cyber Decoded 101, we take a technical look at Scanning & Enumeration — two fundamental stages of ethical hacking and penetration testing. We cover how security professionals identify live hosts, discover open ports, fingerprint services and operating systems, and enumerate the information exposed by network services. You'll learn about: • TCP vs. UDP scanning • The TCP three-way handshake • SYN, Connect and ACK scans• Open, closed and filtered ports • Nmap and service/version detection• Operating-system fingerprinting • Banner grabbing • DNS enumeration• SMB & NetBIOS enumeration • SNMP enumeration • LDAP & Active Directory enumeration • Web and HTTP enumeration • TLS certificates • Vulnerability scanning • How defenders detect network scanning We also explain the important difference between reconnaissance, scanning, enumeration, vulnerability analysis and exploitation. If you're learning ethical hacking, preparing for cybersecurity certifications, or simply want to understand how attackers map networks before attempting exploitation, this episode provides the technical foundation. For educational and authorized security-testing purposes only. #Cybersecurity #EthicalHacking #Nmap #NetworkSecurity #PenetrationTesting #InfoSec #CyberSecurityTraining #Hacking