PingLabz brings together networking guides, practical reference articles, and CCNA browser labs. This page helps you choose a starting point and work through the material in order. The browser lab app replaces our retired CML lab libraries: start with free IOS Essentials, then use a paid membership to unlock the remaining labs. No CML installation or device images are needed for the app.
Last updated: September 22, 2026.
New Here? Read These 5 First
Start with these five resources: try the browser lab app, then build your understanding with the networking fundamentals and command reference.
Choose Your Path
Most readers fall into one of five groups. Find yours and follow the steps in order - each path is sequenced so every article builds on the one before it.
Path 1: I'm New to Networking
Start with the fundamentals cluster. These articles assume zero background and build the vocabulary and mental models everything else depends on.
Path 2: I'm Studying for the CCNA
Pair the CCNA study articles with hands-on practice in the browser app. The library includes 68 labs covering IOS essentials, network fundamentals, switching, routing, IP services, security, troubleshooting, and a campus capstone. IOS Essentials is free; the other 67 labs require paid membership.
- Is the CCNA Worth It in 2026? — decide how the certification fits your goals.
- Start with free IOS Essentials — learn your first commands in the browser.
- Explore the CCNA browser labs — work through the topics alongside the matching study guides.
- Use the complete guides — review a topic when a lab exposes a gap in your understanding.
Path 3: I'm a Working Engineer Going Deeper
Skip the basics and go straight to the complete guides. Each one is a full reference for its protocol, from fundamentals through enterprise design, hardening, and troubleshooting, with a reading-order index of every deep-dive article in that cluster.
Path 4: I Want Hands-On Practice
Start in the browser app: open the labs page, try IOS Essentials, and choose your next topic. If you also maintain your own home lab, the independent setup and tooling articles below remain useful references; they are not prerequisites for the app.
Path 5: I'm Focused on Network Security
Three clusters cover the security side of the house: port-based access control, the ASA firewall, and network reconnaissance.
The Complete Guides: Every Topic Pillar
Each guide below is the hub for its topic cluster. It explains the protocol end to end, shows a minimum viable configuration on Cisco IOS XE with real show output, and indexes every deep-dive article in reading order. Bookmark the ones you work with. If you would rather browse by subject than by cluster, the Topics index lists every tag on the site, ordered by how much has been written about it.
Fundamentals
OSI and TCP/IP, subnetting and VLSM, switching concepts, architectures, PoE, and virtualization.
Routing and WAN
The routing table, administrative distance, longest prefix match, and static routes.
Link-state routing: LSAs, areas, DR/BDR, cost tuning, and enterprise design.
The internet's routing protocol: attributes, best path, filtering, and RPKI.
DUAL, feasible successors, K values, and named vs classic mode.
Labels, LDP, L3VPN with MP-BGP, and segment routing.
Overlay/underlay, OMP, Catalyst SD-WAN architecture, and MPLS migration.
Tunnel config, MTU pitfalls, GRE over IPsec vs IPsec over GRE, and DMVPN intro.
Address types, the header, and IOS XE configuration.
Classification, marking, queueing, and MQC on Cisco IOS XE.
PIM sparse mode, IGMP, RPF checks, SSM, and multicast troubleshooting.
mGRE plus NHRP, Phase 1 / 2 / 3 behavior, IPsec profiles, and dual-hub design.
IKEv1 and IKEv2, crypto maps vs VTI, NAT traversal, and phase-by-phase troubleshooting.
Switching and Campus
Tagging, trunking, inter-VLAN routing, VXLAN, and L2 security.
Root bridges, RSTP, MST, guards, and campus hardening.
HSRP, VRRP, and GLBP: first-hop redundancy compared and configured.
VXLAN and BGP EVPN, LISP, SD-Access fabric roles, and choosing a segmentation layer.
Data Center
Spine-leaf on NX-OS: vPC, the OSPF underlay, BGP EVPN route types, VXLAN L2VNI and L3VNI, and anycast gateways.
Services and Automation
NAT, NTP, SNMP, syslog, DHCP relay, and TFTP/FTP with real IOS XE output.
SDN, REST APIs and JSON, Ansible, and AI in network operations.
Security, Wireless, and Tools
CoPP, uRPF, AAA with TACACS+ and RADIUS, MACsec, IPv6 first-hop security, and management-plane hardening.
Port-based NAC with Cisco ISE: EAP methods, dACLs, CoA, and deployment.
Security levels, NAT, site-to-site and AnyConnect VPNs, and failover.
The full 9800 series: architecture, config model, RRM, roaming, and troubleshooting.
Host discovery, scan types, version detection, NSE, and evasion.
TCP and UDP throughput testing, jitter and loss, window tuning, and slow-path troubleshooting.
ICMP mechanics, every failure message decoded, MTU testing, and sweeps.
Zone transfers, subdomain brute forcing, and the Kali DNS recon toolset against a live zone.
tcpdump and Wireshark, capture and display filters, reading a handshake, and proving where the packets stop.
ip, ethtool, ss, traceroute, mtr, dig, curl, netcat, socat, SSH, tshark and ngrep for network engineers: the 2026 field reference and free printable cheat sheet, routing and neighbor tables, NIC offloads, DNS resolution, path and MTU testing, socket state, port checks, tunnels, packet analysis and host firewalling from the terminal.
CCNA Browser Labs
Practice directly in your browser with guided exercises and an interactive command line. The new app replaces the retired CML build, troubleshooting, automation, Mega Lab, CCIE Super Lab, and 9800 lab libraries. The old flashcards offering has also been retired.
Start with free IOS Essentials
Explore 68 browser labs. IOS Essentials is free; paid membership unlocks the other 67 labs. No CML installation or device images required.
Explore the browser labsFree Cheat Sheets and References
Printable field references built from the same cluster content, designed to sit next to your keyboard.
How PingLabz Is Different
Our networking reference articles explain concepts through configurations, packet analysis, and captured device output. The browser lab app adds an interactive simulator for practicing supported commands and completing guided exercises without running your own CML environment.
Use the articles to understand the mechanisms and the app to practice. The app simulates networking behavior; it does not run a Cisco IOS image or replace every capability of a physical or virtual device.
New guides are added across topic clusters as they are ready. For free field references and the option to receive occasional updates, create a free account.
Frequently Asked Questions
Where should I start if I know nothing about networking?
Follow Path 1 above, in order. It starts with TCP/IP and the OSI model, then moves through devices, routing, and VLANs. After those six pieces you will be ready for the CCNA track or any of the complete guides.
Are the labs free?
IOS Essentials is free. The other 67 browser labs require a paid PingLabz membership. Open the labs page to choose an exercise and connect your membership when prompted.
What do I need to run the labs myself?
A browser and an internet connection. You do not need CML, device images, or a home-lab server to use the browser app. Lab progress is saved in your browser and does not sync between devices.
In what order should I study for the CCNA?
Follow Path 2: begin with IOS Essentials, then work through network fundamentals, network access, IP connectivity, IP services, and security. Use the matching reference articles to understand the commands and revisit exercises to check your understanding.
How often is new content published?
Weekly. New articles are added to their cluster's complete guide and to this page, so checking here (or subscribing) is enough to stay current.
Key Takeaways
Choose a path, use the complete guides as references, and practice in the CCNA browser labs. Start with free IOS Essentials and build from there.