# Network Security Overview
Network security encompasses policies, technologies, and practices designed to monitor, prevent, and respond to unauthorized network intrusion.
# OSI & TCP/IP Models
Understanding the 7 layers of the OSI model helps security analysts pinpoint where attacks occur—from Layer 2 ARP spoofing to Layer 7 HTTP exploits.
# Packet Inspection & Wireshark
Packet analysis allows engineers to capture raw binary network frames, inspect headers, and analyze traffic behavior during anomalies.
# Common Network Attacks
Port scanning (Nmap), Man-in-the-Middle (MITM), DNS poisoning, and SYN Flood denial-of-service attacks.
# Layered Defense Strategies
Deploy next-generation firewalls, intrusion detection systems (Snort/Suricata), network segmentation (VLANs), and encrypted VPNs.