NHPREPnetworkershome

Home Browse Courses Labs Lessons Quiz Blog

Sign In Start Free

Interview PreparationBack

Lesson 2 of 13

OSI and TCP/IP Models

Practice with Hands-On Labs

30 step-by-step labs for CCNA, CCNP Enterprise & Security

Course Content

Interview Preparation Roadmap and Fundamentals Overview

OSI and TCP/IP Models

TCP/IP Stack and Transport Layer Mechanisms

TCP Header Fields, Sequence Numbers and Window Scaling

TCP State Machine and Connection Teardown

TCP Connection Resets and SYN Flood Mitigations

ARP, Gratuitous ARP and Proxy ARP

NAT and PAT: Static, Dynamic, and Port Forwarding

DNS Functionality and DHCP Operation

Email Protocols and DNS Security Records

VLANs, STP, DTP, VTP and EtherChannel

SSL and TLS Protocols and Handshake

Security Interview Scenarios and Troubleshooting

NHPREPnetworkershome

Where network engineers are made. CCNA to CCIE, labs to AI — one subscription.

🇮🇳 🇸🇦 🇲🇽 🇫🇷 🇦🇪

Learn

Browse Courses Hands-On Labs Lessons Quiz AI Mock Interviews

Tracks

CCNA CCNP CCIE Security Cloud & DevOps AI & Automation

Resources

Blog (70+ articles)Interview Series Sign Up — Free Sign In

Company

About Contact Privacy Terms Refund Policy

© 2026 NHPREP · networkershomeMade for engineers, by engineers.