Both firewalls run the same FreeBSD packet filter, so on a mini-PC the raw speed numbers come out…
You buy a fanless N100 or N305 mini-PC, load OPNsense onto it, and everything looks perfect until the…
Before you buy a box to run pfSense or OPNsense, settle one question: how fast is the link…
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…
Security Fundamentals covers more separate skills than any other part of the Cisco CCNA 200-301 exam. It is…
Two offices in different cities need to act like one network, and a worker at home needs to…
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…
