Learn networking fundamentals with clear guides on the OSI vs TCP/IP models, IP addressing & subnetting, routing vs switching, DNS & DHCP, NAT/port forwarding,
Affichage de 1 – 17 sur 17 articles
TCP/IP model explained: the 4 real layers per RFC 1122, how they map to OSI's 7 layers, and how to spot each one in a live packet capture.
The OSI model explained: what each of the 7 layers does, PDU names, encapsulation, device mapping, and how to troubleshoot issues layer by layer.
Evergreen beginner guide explaining what is a VPN, how tunneling and encryption work, key protocols (IPsec, SSL VPN, WireGuard), deployment models, trade-offs, and troubleshooting.
A beginner-friendly, step-by-step guide to network troubleshooting basics using an OSI layered approach, baseline testing, key diagnostic commands, and a practical checklist.
Evergreen guide to packet loss and jitter: definitions, real-world impact on VoIP/video/gaming, measurement with common network tools, and step-by-step fixes for Wi‑Fi, wired, and upstream causes.
Evergreen guide that explains MTU, fragmentation, PMTUD/PLPMTUD, blackhole MTU symptoms, and practical troubleshooting steps including MSS clamping and tunnel overhead considerations.
Evergreen explanation of bandwidth, latency/RTT, jitter, and throughput with measurement tools, application impact, misconceptions, and a troubleshooting checklist to identify network bottlenecks.
An evergreen beginner guide explaining the differences between a modem, router, switch, and access point, with WAN/LAN context, home/SMB examples, and practical setup tips.
Beginner guide explaining what is a firewall, how firewall rules/ACLs and state tables control ingress/egress traffic, and best practices for secure network and cloud deployments.
Beginner-friendly guide comparing TCP vs UDP, explaining how each works, key differences, performance tradeoffs, and when to use each with real-world protocol and port examples.
Beginner-friendly NAT explained guide covering what NAT is, why it exists, SNAT vs DNAT, PAT/masquerade, Linux and cloud examples, limitations, and troubleshooting.
DHCP explained: the DORA process, lease renewal (T1/T2), the options that matter, scopes vs reservations, DHCP security, and step-by-step troubleshooting.
DNS TTL and caching explained: how resolution really works, why propagation is just cache expiry, and the exact TTL timing that keeps a migration downtime-free.
VLAN basics explained: what VLANs are, 802.1Q tagging, access vs trunk ports, VLAN ID ranges, VLAN hopping risks, and a tested config example.
How routers work: how routing tables (RIB/FIB) are built, next hop resolution, and longest prefix match, with worked packet-forwarding examples.
An evergreen beginner guide to IPv6 basics covering address notation, hextets, prefixes and /64 subnetting, SLAAC/DHCPv6, NDP, IPv6 vs IPv4 differences, and transition strategies like dual stack and NAT64.
Beginner-friendly OSI model vs TCP/IP model comparison with layer mapping, protocol examples, troubleshooting guidance, and interview takeaways.
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