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Close-up view of a mouse cursor over digital security text on display.

Linux File Permissions: The Interview Question Everyone Gets Wrong

Homelab Builds, Linux Fundamentals, Uncategorized /

The Question That Ends Interviews “What does 755 mean?” I’ve seen candidates with impressive CVs stumble on this. They know Linux, they’ve used chmod, but they can’t explain what the numbers actually mean. Interview over. File permissions are the foundation of Linux security. Every file, every directory, every script you run is governed by permissions. […]

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IP subnet calculator interface showing network class selection, subnet mask input, and real-time calculation results

IP Subnet Calculator

Free Resources, Internet & Networking, Toolkits & Build Sheets, Uncategorized /

Calculate subnet masks, CIDR notation, wildcard masks, and host ranges in seconds. Built for network engineers, system administrators, and anyone configuring IP networks. What This Tool Does ▸ Instant Calculations: Enter any IP address and subnet mask to get complete network information ▸ CIDR Support: Works with CIDR notation (/24, /16, etc.) and traditional subnet

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