Topics
Every topic on PingLabz, from routing protocols to hands-on labs captured on real Cisco gear.
Labs
Hands-on Cisco IOS XE lab walkthroughs. Each lab ships with a real CML topology, configs you can paste, and verified show output. Articles tagged Labs cover the full CCNA 200-301 blueprint across Network Fundamentals, Network Access, IP Connectivity, IP Services, and Security Fundamentals.
241 posts
CCIE
CCIE-level material for engineers past the CCNP line. Articles tagged CCIE cover expert-track routing, overlays, security and automation, with full configs and real device output from CML.
126 posts
Fundamentals
Networking fundamentals and CCNA-level reference content. The TCP/IP and OSI models, ethernet basics, encapsulation, IPv4 addressing, layer 2 fundamentals, and the Cisco IOS commands every network engineer reaches for. The foundations beneath the pillar guides.
111 posts
ASA
Cisco Adaptive Security Appliance, the stateful firewall platform that has anchored enterprise perimeters for two decades and is now being succeeded by Secure Firewall (FTD). Articles tagged ASA cover security levels, NAT 8.3+ and twice NAT, ACLs, AnyConnect SSL and IKEv2 VPN, site-to-site IPsec, failover, packet-tracer, hardening, and ASAv 9.x lab walkthroughs.
69 posts
OSPF
Open Shortest Path First, the link-state IGP behind most enterprise networks. Articles tagged OSPF cover neighbor relationships, LSA types, areas, DR/BDR election, and Cisco IOS XE configuration.
60 posts
BGP
Border Gateway Protocol, the path-vector protocol that holds the internet together and increasingly runs inside enterprise data centers. Articles tagged BGP cover fundamentals, neighbor states, path attributes, best-path selection, traffic engineering, and Cisco IOS XE configuration.
59 posts
Wireless
Enterprise Wi-Fi on Cisco Catalyst 9800, the WLC platform that replaced the AireOS generation. Articles tagged Wireless cover the configuration model, AP join, WPA3, FlexConnect, RRM, fast roaming, SSO HA, and IOS XE troubleshooting.
52 posts
Network Security
Hardening the network you already run. Articles tagged Network Security cover control-plane protection, access control, segmentation, and the attacks each countermeasure is actually stopping.
50 posts
VLAN
Virtual LANs and Layer 2 switching, the foundation of every campus network. Articles tagged VLAN cover fundamentals, trunking, inter-VLAN routing, EtherChannel, troubleshooting, and campus design on Cisco Catalyst switches.
47 posts
CCNA
Everything mapped to the CCNA 200-301 blueprint. Articles tagged CCNA cover the exam topics in the order you actually learn them, each one backed by a lab you can build yourself.
40 posts
802.1X
Port-based network access control, the standard for authenticating users and devices onto wired and wireless networks. Articles tagged 802.1X cover supplicant and authenticator behavior, RADIUS, EAP methods, Cisco ISE, dynamic VLANs, dACLs, host modes, and phased deployment.
38 posts
STP
Spanning Tree Protocol, the loop-prevention mechanism that keeps Layer 2 networks stable. Articles tagged STP cover port roles and states, RSTP and MST, root bridge configuration, BPDU Guard and Root Guard hardening, and Cisco Catalyst troubleshooting.
36 posts
EIGRP
Enhanced Interior Gateway Routing Protocol, Cisco's hybrid distance-vector IGP. Articles tagged EIGRP cover the DUAL algorithm, composite metric and K values, stub routing, adjacency requirements, and Cisco IOS XE configuration.
28 posts
Networking
Vendor-neutral fundamentals that apply no matter whose box you are logged into. Addressing, encapsulation, the OSI layers in practice, and why the packet went where it did.
24 posts
IP Services
The services running alongside routing that keep a network usable. Articles tagged IP Services cover NAT, DHCP, NTP, SNMP, syslog, NetFlow and IP SLA on Cisco IOS XE.
23 posts
Network Automation
Configuring and validating devices with code instead of a keyboard. Articles tagged Network Automation cover Python tooling, model-driven interfaces and testing changes before they ship.
23 posts
VPN
Site-to-site and remote-access VPN across Cisco platforms. Articles tagged VPN cover tunnel design, encryption choices, routing over the overlay, and how to prove traffic is actually protected.
23 posts
IPsec
The encryption suite underneath almost every Cisco VPN. Articles tagged IPsec cover IKEv2 negotiation, transform sets, SA lifetimes, and reading a phase 1 or phase 2 failure.
22 posts
MPLS
Multiprotocol Label Switching, the forwarding paradigm that powers most service provider backbones and large enterprise WANs. Articles tagged MPLS cover labels and the label stack, LDP, L3VPN with MP-BGP and VPNv4, traffic engineering, and segment routing.
21 posts
SD-WAN
Software-Defined WAN, the overlay-based architecture replacing traditional hub-and-spoke MPLS in enterprise networks. Articles tagged SD-WAN cover architecture, Cisco Catalyst SD-WAN (Viptela), SASE convergence, deployment models, and day-2 operational realities.
21 posts
IPv6
The 128-bit successor to IPv4 and the protocol every modern network is migrating toward. Articles tagged IPv6 cover address format and types, the simplified header, Neighbor Discovery, SLAAC autoconfiguration, and Cisco IOS XE configuration.
20 posts
Troubleshooting
Broken networks, reproduced on purpose. Articles tagged Troubleshooting walk a fault from symptom to root cause using show commands, captures and a repeatable method.
20 posts
Cisco IOS XE
The operating system behind nearly every capture on this site. Articles tagged Cisco IOS XE cover configuration syntax, show command output, platform behaviour and version quirks.
19 posts
GRE
Generic Routing Encapsulation, the simple tunneling protocol that sits behind countless enterprise overlays. Articles tagged GRE cover how it works, packet format, Cisco IOS XE configuration, keepalives, MTU, GRE over IPsec, and routing protocol support.
18 posts
Cisco Modeling Labs
The virtual lab every PingLabz capture comes from. Articles tagged Cisco Modeling Labs cover topology design, bridging real hosts into a lab, and getting output that matches production.
16 posts
IP Routing
The routing half of the CCNP and CCIE blueprints. Articles tagged IP Routing cover static and dynamic routing, redistribution, policy routing and route manipulation on Cisco IOS XE.
15 posts
QoS
Quality of Service, the toolkit for keeping latency-sensitive traffic flowing predictably across crowded networks. Articles tagged QoS cover classification and marking (DSCP, CoS), MQC, queueing (LLQ, CBWFQ), policing, shaping, and voice and video treatment in SD-WAN and wireless.
14 posts
DMVPN
Dynamic Multipoint VPN, the hub-and-spoke overlay that builds spoke-to-spoke tunnels on demand. Articles tagged DMVPN cover NHRP, mGRE, the three phases, and routing over the overlay.
13 posts
Nmap
The scanner most engineers reach for first. Articles tagged Nmap cover host discovery, port and service detection, timing and NSE scripts, run against real lab targets.
12 posts
Security
Broader security topics that touch the network without belonging to a single platform. Threat models, defensive design, and the trade-offs behind each control.
10 posts
Multicast
One sender, many receivers, and a forwarding model that runs backwards. Articles tagged Multicast cover IGMP, PIM sparse and dense mode, RP placement and the RPF check.
8 posts
Routing
How routers choose a path and what happens when two protocols disagree. Articles tagged Routing cover administrative distance, redistribution, path selection and route filtering.
7 posts
FHRP
First Hop Redundancy Protocols (HSRP, VRRP, GLBP), the gateway redundancy mechanisms that keep clients connected when a router fails. Articles tagged FHRP cover the three protocols compared, configuration patterns, STP integration, and Cisco IOS XE walkthroughs.
7 posts
Overlay Networking
Virtual topologies built on top of an existing IP network. Articles tagged Overlay Networking cover VXLAN, EVPN, LISP and the encapsulation choices behind each fabric.
7 posts
Kali Linux
The attacker workstation in the PingLabz lab. Articles tagged Kali Linux cover the tooling that ships with the distro and how each one behaves against Cisco infrastructure.
6 posts
DNS Enumeration
Pulling structure out of a domain from the outside. Articles tagged DNS Enumeration cover zone transfers, brute forcing, reverse lookups and the Kali tooling for each.
6 posts
DNS
Name resolution and the failures that look like everything else. Articles tagged DNS cover resolvers, record types, zone behaviour and query troubleshooting.
6 posts
Penetration Testing
Offensive technique run against lab gear you own. Articles tagged Penetration Testing cover recon, enumeration and exploitation from a real Kali host wired into the lab.
6 posts
iPerf
Measuring throughput instead of guessing at it. Articles tagged iPerf cover TCP and UDP tests, tuning windows and parallel streams, and reading results from a real Linux host.
6 posts
Ping
The first command anyone runs and the most misread result in networking. Articles tagged Ping cover options, sizing, exit codes and what a failure does and does not prove.
6 posts
Python
Python for people who run networks. Articles tagged Python cover the libraries, scripts and patterns used to talk to devices, parse output and automate the boring parts.
5 posts
Monitoring
Knowing something broke before the tickets arrive. Articles tagged Monitoring cover SNMP, syslog, NetFlow, IP SLA and what is worth alerting on.
5 posts
CML
Short notes on running Cisco Modeling Labs itself. Node definitions, external connectors, resource limits and the quirks you hit building topologies.
4 posts
Catalyst 9800
Cisco's wireless LAN controller platform. Articles tagged Catalyst 9800 cover WLAN profiles, policy and RF tags, AP join behaviour and controller troubleshooting.
3 posts
Linux
The Linux side of a network engineer's job. Articles tagged Linux cover interfaces, routing tables, name resolution and the CLI tools used for testing from a real host.
3 posts