Cloud VPC Networking: Subnets, Routes, and Security Groups Explained
A Virtual Private Cloud (VPC) is your own private slice of a cloud provider’s network. AWS, Google Cloud, and Azure all offer…
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netcat — The Swiss Army Knife of Networking
Test ports, transfer files, grab banners, run ad-hoc servers. nc + everything. The tool every sysadmin learns once and uses forever.
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nmap Port Scanning Explained
Find open ports, service versions, OS fingerprints. The legitimate uses, the ethics, and the most useful flags.
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dig and nslookup — DNS Troubleshooting
The two commands every network admin needs to read DNS like a book. dig output explained, useful flags, when to use which.
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ping and traceroute Explained
The first two commands in every network debug session. ICMP, TTL, and what each tool actually tells you.
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Network Hardening Checklist
Default deny, log everything, segment ruthlessly. The 12 things to check on every network you control.
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Packet Capture with Wireshark and tcpdump
Capture filters, display filters, following streams. The skill that turns network mysteries into solved problems.
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IDS vs IPS — Detection vs Prevention
IDS watches and alerts. IPS blocks. Snort, Suricata, and where each fits in your network.
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Network Segmentation and VLANs
Why putting everything on one flat network is dangerous. How VLANs, subnets, and zero-trust ideas keep a breach from spreading.
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Common Network Attacks Every Admin Should Recognize
MitM, ARP poisoning, DDoS, DNS spoofing, packet sniffing. The attacks every network defender needs to recognize and how each one works.