How To
Configure NAT and PAT on a Cisco Router
Every phone, laptop, and server on a private network needs to reach the internet, yet they all carry…
Author
Josphat Mutai
Networking
CCNA 200-301 Domain 5 Practice Test: Security Fundamentals
Security Fundamentals covers more separate skills than any other part of the Cisco CCNA 200-301 exam. It is…
AI
Install and Use Unsloth Studio for No-Code LLM Fine-Tuning
Unsloth Studio puts the whole fine-tune in a browser. You pick a base model, drop in a dataset,…
AI
Fine-Tune an LLM with Unsloth: QLoRA on a Single GPU
A QLoRA fine-tune of Llama 3.1 8B finished in about 34 seconds on a single RTX 4090, and…
Networking
Remote Access vs Site-to-Site VPN Explained
Two offices in different cities need to act like one network, and a worker at home needs to…
How To
Configure Cisco Dynamic ARP Inspection (DAI)
ARP has no way to verify that a reply is honest. A host asks “who has 192.168.10.1?” and…
How To
Configure Cisco DHCP Snooping to Block Rogue Servers
When a PC boots, it trusts the first DHCP server that answers. It cannot tell the company’s real…
How To
Cisco Port Security: Configure Sticky MACs and Violations
A switch port with nothing plugged into it is still a live network jack. Anyone who can reach…
How To
Configure Cisco Access Control Lists (ACLs)
Configure and verify Cisco ACLs: standard, extended, and named access control lists, wildcard masks, placement, and show access-lists…
How To
AAA Explained: RADIUS vs TACACS+ on Cisco
AAA explained and compared: authentication, authorization, accounting, and RADIUS vs TACACS+ ports, transport, and encryption, with Cisco AAA…
How To
Configure Cisco Device Access Control with Local Passwords
Configure and verify Cisco device access control with local passwords: enable secret, console and VTY lines, login local,…
Networking
Network Security Concepts: Threats, Exploits, and Defenses
The network security concepts the CCNA tests: threats vs vulnerabilities vs exploits, the CIA triad, defense in depth,…