Configure a Cisco DHCP Server and Relay
A laptop that joins a network gets its IP address, subnet mask, default gateway, and DNS server in…
A laptop that joins a network gets its IP address, subnet mask, default gateway, and DNS server in…
Every phone, laptop, and server on a private network needs to reach the internet, yet they all carry…
Unsloth Studio puts the whole fine-tune in a browser. You pick a base model, drop in a dataset,…
A QLoRA fine-tune of Llama 3.1 8B finished in about 34 seconds on a single RTX 4090, and…
ARP has no way to verify that a reply is honest. A host asks “who has 192.168.10.1?” and…
When a PC boots, it trusts the first DHCP server that answers. It cannot tell the company’s real…
A switch port with nothing plugged into it is still a live network jack. Anyone who can reach…
Configure and verify Cisco ACLs: standard, extended, and named access control lists, wildcard masks, placement, and show access-lists…
AAA explained and compared: authentication, authorization, accounting, and RADIUS vs TACACS+ ports, transport, and encryption, with Cisco AAA…
Configure and verify Cisco device access control with local passwords: enable secret, console and VTY lines, login local,…
Router-on-a-stick gets inter-VLAN routing working, but it routes in software and squeezes every packet between VLANs through one…
Put two computers in different VLANs on the same switch and they cannot reach each other. That is…