What is NAT? How network address translation rewrites addresses, the main types from PAT to CGNAT, cloud NAT gateways, and what NAT can and cannot protect.
Subnetting explained step by step: network and host bits, subnet masks, and worked examples splitting an office network into smaller subnets.
Static vs dynamic IP addresses compared: how each works, when a business genuinely needs a static IP, and cheaper alternatives like dynamic DNS and VPNs.
Public vs private IP addresses explained: the reserved private ranges, how NAT connects them, how to find each one, and why the difference matters.
How port forwarding works, how to set it up safely on a router, why it sometimes fails, and the safer alternatives for remote access and hosting.
Latency vs bandwidth explained: why a faster plan does not always speed up websites, how round trips add up, and how to measure and reduce delay.
IPv4 vs IPv6 for businesses: how the addresses differ, what dual stack means, the security gaps to watch, and how to check your site's IPv6 support.
How to check if a port is open from inside or outside your network with online tools, PowerShell, netcat and nmap, and how to read the results.
A reference to common ports for web, email, remote access, databases and VPNs, with TCP/UDP details and which ones should never face the internet.
CIDR notation decoded: what the slash number means, a quick reference table from /8 to /32, and how CIDR ranges appear in firewalls and cloud rules.
A business VPN explained: remote access vs site-to-site, IPsec, WireGuard and SSL VPN protocols, split tunnelling, and how to set one up securely.
Base64 encoding explained: how it turns binary into text, where it is used in email, data URLs and APIs, and why it is never a form of encryption.
