01
Security in a Networked Environment
Once systems are connected, the attack surface expands. Network security focuses on protecting data in transit, network services, connected devices, and the paths through which users and attackers communicate.
Basic security concerns in networks include:
- unauthorized access,
- eavesdropping,
- spoofing,
- service disruption,
- malware spread,
- weak remote access,
- insecure wireless connections.
Network security is especially important because a single weak point can affect many systems at once.
02
Network Devices and Security Functions
Several network components contribute to security.
| Device or Concept | Security Purpose |
|---|---|
| Firewall | Filters traffic according to rules |
| Router | Connects networks and can enforce some traffic policies |
| Switch | Connects devices in a local network; can support VLAN separation |
| IDS | Detects suspicious activity |
| IPS | Detects and can block suspicious activity |
| VPN | Protects remote communications over untrusted networks |
| Proxy | Intermediates requests and can filter content |
A firewall is important, but it is not enough by itself. Secure network design often includes segmentation, rule review, host hardening, secure services, and monitoring.
03
Segmentation, Secure Protocols, and Design Basics
ProPro activity
ProReviewer — locked
Drills, code labs, and full solutions.
04
Wireless and Remote Access Security
ProPro activity
ProReviewer — locked
Drills, code labs, and full solutions.
05
Practice & Exam Drills — Lesson 5
ProPro activity
ProReviewer — locked
Drills, code labs, and full solutions.