Category: Network
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What Are Cookies? Why Do You Stay Logged In? ── The Real Meaning of “Accept Cookies?”
The sites and work systems you casually stay logged into ── close the browser, come back tomorrow, and they still greet you signed in. But behind them, the server tends to forget you with every single request. So why are you remembered? The answer is the cookie ── the same…
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What Is HTTPS, and What Makes HTTP Dangerous? The Real Meaning of the Lock Icon in Your Address Bar ── How You Can Send a “Secret Box” Nobody Else Can Open
“As long as it’s HTTPS, you’re safe” ── but how true is that, really? And when HTTP gets flagged as “Not secure”, what exactly isn’t secure about it? HTTPS puts everything between you and a website into a “secret box” that nobody along the route can open ── but how…
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What Happens Between Typing a URL and the Page Appearing? ── DNS, IP, DHCP, NAT, Switches and Routers, and Firewalls, Explained Step by Step
You type a URL into the address bar, hit Enter, and the page appears in under a second ── behind that instant, your PC borrows an address, looks up a phone book, entrusts its package to a sorting clerk and the town exit, passes a checkpoint inspection, and receives an…
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Switch vs Router: What’s Actually Different? ── The Town’s Sorting Clerk and the Town Exit (MAC vs IP Two-Story Addresses, Hubs vs Switches, and Why Your Wi-Fi Router Is Really Several Devices in One)
At home there’s “the router.” Under the office desk there’s a different box with a whole row of LAN ports ── so what’s the difference between the two? The answer lies in how each one uses addresses. A switch hands packages to recipients within the same town (the same network)…
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Why Does Your IP Address Assign Itself? ── DHCP Explained Through a “Move-In Process” (DORA, Leases, Pool Exhaustion, and the Truth About 169.254)
You type in the Wi-Fi password and the web just works ── yet you never entered an address, and someone, somewhere, must be assigning one to your device. That someone is DHCP. This article explains the building-manager mechanism that lends addresses on fixed-term leases: the four-step DORA move-in process, why…
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What Is NAT? The “Translation Desk” That Lets Everyone Share One IP ── Why You’re Unreachable from Outside, the NAT Table, Port Forwarding, and Game NAT Types
Check “what is my IP” on every device in your house and you get the same value back ── the thing working behind that mystery is NAT (Network Address Translation). This article covers the “translation desk and ledger” mechanism that lets everyone share one global IP, why outside-initiated traffic structurally…
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What Is a VPN? The Encrypted Tunnel That Lets Your PC Pretend It’s in the Office ── Encapsulation, Full vs. Split Tunnels, and How Company VPNs Differ from VPN Apps
That “Connect VPN” button you click every work-from-home morning ── behind it, your traffic is being sealed into encrypted envelopes and carried through a “tunnel” to the office. This article covers the two problems a VPN solves (snooping on the route, and internal systems being unreachable from outside), how tunneling…
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Why Is the Office Network So Slow? A Practitioner’s Map of the Usual Suspects ── DNS, Broadcasts, VPNs, and Address Exhaustion
“The office network crawls every Monday morning” ― “everything slows down the moment I connect to the VPN” ― a slow company network has a cast of usual suspects, each defined by whether bandwidth, latency, or loss is the thing that’s clogged. This article maps the classic bottlenecks ― DNS,…
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What Is DNS? A Beginner-Friendly Guide to How Domain Names Become IP Addresses
When you type “toolcluster.app” into your browser, a Web page comes back almost instantly because DNS (the Domain Name System) is silently translating that string into an IP address behind the scenes. This article walks through the 7-phase “name resolution journey” from your browser to the authoritative name server, explains…
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What Is an IP Address? A Visual Beginner’s Guide to How Devices Are Grouped on the Internet
What does an address like “192.168.1.10” actually mean? This beginner-friendly guide visualizes how IP addresses are grouped into networks, with an interactive tree view and color-coded table — covering octets, subnets, and CIDR notation in plain language.