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Network Devices & Protocols Explained

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About Course

This course dives deep into the networking devices and communication protocols that form the backbone of the internet. You’ll learn how routers, switches, and firewalls operate, how data packets are transmitted using TCP/IP, and how common protocols like HTTP, DNS, and SSH work behind the scenes.
By the end, learners will confidently identify, configure, and secure basic network components — a must-have skill for cybersecurity professionals.

What Will You Learn?

  • Identify and understand all major network devices
  • Explain OSI and TCP/IP layers clearly
  • Describe how key protocols (HTTP, DNS, SSH, FTP) work
  • Use basic commands for network monitoring
  • Understand security devices like Firewalls and IDS

Course Content

Introduction to Networking Devices
What are networking devices? Difference between passive and active devices Network device categories (core, distribution, access layer)

Hub, Switch, and Router Explained
Hub: Simple broadcast device (Layer 1) Switch: Smart forwarding device (Layer 2) Router: Connects different networks (Layer 3) Comparison table: Hub vs Switch vs Router Real-world example: Data flow between LAN & Internet

Other Important Network Devices
Modem: Connecting LAN to ISP Access Point: Wireless communication hub Repeater: Signal amplification Bridge: Connecting two LANs Gateway: Interface between dissimilar systems

Network Security Devices
Firewall: Filtering inbound/outbound traffic IDS/IPS: Intrusion Detection & Prevention Systems Proxy Server: Hides internal network identity Load Balancer: Distributes traffic efficiently

Introduction to Protocols
What is a protocol? Protocol layers and communication How protocols define rules for data exchange

OSI & TCP/IP Model (Protocol Layers)
7 Layers of OSI explained simply 4 Layers of TCP/IP model Mapping OSI ↔ TCP/IP layers Role of each layer (Physical → Application)

Key Network Protocols & Their Roles
Application Layer: HTTP, HTTPS, DNS, SMTP, FTP, SSH Transport Layer: TCP, UDP Network Layer: IP, ICMP Link Layer: ARP, MAC, Ethernet Common port numbers and functions

Real-World Protocol Communication
DNS lookup process explained HTTP request & response demonstration Ping and traceroute hands-on Secure communication with SSH demo

Network Configuration & Monitoring
Checking IP, MAC, and routes (Windows/Linux commands) Configuring static and dynamic IP Using ipconfig, ping, netstat, traceroute, nslookup Monitoring network traffic (Wireshark basics intro)

Quiz + Practical Task
Quiz covering devices, OSI layers, and protocols Practical: Identify devices in your home/college network Bonus: Capture network packets using Wireshark (demo task)

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sachin rathor
4 weeks ago
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