Knowledge base
Networking articles
Guides, subnet references, and configuration examples for network engineers.
Apr 30, 2026
generalWireless Networking Fundamentals — 802.11 Standards, SSID, and Security
Essential wireless networking concepts for network engineers. Covers 802.11 standards, frequency bands, SSID configuration, WPA3 security, and site survey basics.
Apr 25, 2026
ciscoNetwork Redundancy Protocols — HSRP, VRRP, and GLBP on Cisco IOS
Complete guide to first-hop redundancy protocols. Configure HSRP, VRRP, and GLBP on Cisco IOS for high availability default gateway redundancy.
Apr 20, 2026
ciscoQuality of Service Guide — QoS Configuration on Cisco IOS
Complete guide to QoS on Cisco IOS. Covers classification, marking, queuing, policing, and shaping for voice, video, and data traffic prioritization.
Apr 15, 2026
generalNetwork Security Fundamentals — Firewalls, ACLs, and DMZ Design
Essential network security concepts for engineers. Covers firewall placement, ACL design, DMZ architecture, VLANs for segmentation, and defense in depth.
Apr 10, 2026
routingBGP Basics for Network Engineers — AS Numbers, Peering, and Route Advertisement
Introduction to BGP for network engineers. Covers autonomous systems, eBGP vs iBGP, BGP attributes, route advertisement, and basic Cisco IOS configuration.
Apr 5, 2026
ciscoNAT and PAT Configuration Guide — Cisco IOS Network Address Translation
Complete guide to NAT and PAT on Cisco IOS. Covers static NAT, dynamic NAT, PAT (overload), NAT debugging, and common misconfiguration issues with IP address translation.
Apr 1, 2026
ciscoDHCP Configuration Guide — Cisco IOS Server, Relay, and Troubleshooting
Complete guide to DHCP on Cisco IOS. Covers DHCP server configuration, pools, options, IP helper-address relay, exclusions, and troubleshooting DHCP failures.
Mar 30, 2026
switchingSpanning Tree Protocol Guide — STP, RSTP, and Cisco Enhancements
Complete guide to Spanning Tree Protocol. Covers STP and RSTP operation, bridge election, port roles and states, PortFast, BPDU Guard, and common troubleshooting scenarios.
Mar 25, 2026
ciscoNetwork Troubleshooting Commands — Cisco IOS and Linux Reference
Essential network troubleshooting commands for Cisco IOS, Linux, and Windows. Covers ping, traceroute, show commands, packet capture, and systematic fault isolation methodology.
Mar 20, 2026
ciscoCisco EIGRP Configuration Guide — DUAL, Metrics, and Troubleshooting
Complete guide to configuring EIGRP on Cisco IOS. Covers DUAL algorithm, composite metric, neighbour relationships, route summarisation, and troubleshooting commands.
Mar 15, 2026
subnettingCCNA Subnetting Guide — Fast Subnetting Methods for the Exam
Master IPv4 subnetting for CCNA. Covers magic number method, binary method, VLSM, and exam shortcuts for calculating network addresses, broadcast addresses, and host ranges quickly.
Mar 10, 2026
subnettingIP Addressing Basics — IPv4 Address Classes, Subnetting, and CIDR
Complete guide to IPv4 addressing. Covers address structure, classful addressing, private ranges, CIDR notation, subnet calculation, and how routers use IP addresses.
Mar 5, 2026
ciscoWildcard Mask Calculator and Guide — Cisco ACL and OSPF
Complete guide to wildcard masks in Cisco IOS. Learn how to calculate wildcard masks for ACLs and OSPF network statements, with examples and a reference table.
Mar 1, 2026
ciscoCisco VLAN Configuration Guide — Trunking, Access Ports, and VTP
Complete guide to VLAN configuration on Cisco switches. Covers VLAN creation, access and trunk ports, 802.1Q encapsulation, inter-VLAN routing, and VTP configuration.
Feb 25, 2026
subnettingIPv6 Subnetting Guide — Prefixes, Addressing, and Configuration
Practical guide to IPv6 subnetting. Learn IPv6 address types, prefix notation, how to subnet a /48 allocation, and configure IPv6 on Cisco IOS routers.
Feb 20, 2026
generalEnterprise Network Design Principles — Hierarchical Model and Best Practices
Learn the fundamentals of enterprise network design using the three-layer hierarchical model. Covers core, distribution, and access layers with IP addressing strategies.
Feb 15, 2026
ciscoOSPF Troubleshooting Guide — Common Problems and Solutions
Diagnose and fix common OSPF issues on Cisco IOS routers. Covers neighbor adjacency failures, route missing, MTU mismatch, area type conflicts, and authentication problems.
Feb 10, 2026
ciscoCisco IOS Extended ACL Configuration Guide — Examples and Best Practices
Complete guide to configuring extended access control lists on Cisco IOS. Includes numbered and named ACLs, wildcard masks, port matching, and interface application.
Feb 5, 2026
subnettingVLSM Network Design Guide — Step by Step with Examples
FeaturedLearn Variable Length Subnet Masking with practical examples. Design efficient IP addressing schemes for enterprise networks using VLSM best practices.
Feb 1, 2026
subnettingIPv4 Subnetting Cheat Sheet — Complete Reference for Network Engineers
FeaturedComplete IPv4 subnetting reference with all subnet masks, CIDR notation, usable hosts, wildcard masks, and binary representations from /1 to /32.
Jan 25, 2026
subnettingVLSM Practice Problems with Solutions — Network Design Exercises
Ten VLSM practice problems with step-by-step solutions. Practice variable length subnet masking for CCNA, CCNP, and real-world network design scenarios.
Jan 20, 2026
ciscoCisco OSPF Configuration Guide — IOS Commands and Examples
FeaturedComplete guide to configuring OSPF on Cisco IOS routers. Includes basic setup, multi-area OSPF, passive interfaces, redistribution, and verification commands.
Jan 15, 2026
subnettingIPv4 Subnet Mask Cheat Sheet — Complete Reference
FeaturedComplete IPv4 subnet mask cheat sheet with CIDR notation, usable hosts, wildcard masks, and binary representations for all prefix lengths /1 to /32.