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CCNA Library (74)
Browse all CCNA topics →
Network (13)
OSI Model & TCP/IPIPv4 AddressingTCP vs UDPSubnettingIPv6 BasicsARP — Address Resolution ProtocolICMP — Internet Control Message ProtocolTCP 3-Way HandshakeCabling & Media StandardsMTU & FragmentationWAN Connection TypesHierarchical Network DesignNetwork Virtualization & Containers
Device Operations (5)
Cisco IOS Device ManagementPower over Ethernet (PoE)Cisco IOS File SystemPassword Recovery & Configuration RegisterNetwork Troubleshooting Methodology
Network Access (12)
MAC Address TableVLANsTrunks & 802.1Q TaggingSpanning Tree Protocol (STP)EtherChannel (Link Aggregation)Switching OperationCDP & LLDP — Neighbor DiscoveryBPDU Guard & Root GuardCatalyst Boot ProcessVTP — VLAN Trunking ProtocolRapid STP & MSTPPrivate VLANs (PVLAN)
Wireless (6)
Wireless LAN BasicsWLAN Architectures — Autonomous, Centralized (WLC), Cloud, EmbeddedWi-Fi Security — WEP, WPA, WPA2, WPA3Wi-Fi 6, 6E, and 7 FeaturesWireless RF FundamentalsAccess Point Operating Modes
IP Connectivity (10)
Inter-VLAN RoutingStatic RoutingDefault RoutingRouting Decision ProcessFHRP — HSRP, VRRP & GLBPLayer-3 Switch & SVI RoutingOSPF Single-AreaRoute SummarizationIPv6 SLAAC & DHCPv6IPv6 Transition Mechanisms
IP Services (11)
HSRP vs VRRP vs GLBP — FHRP ComparedDHCP — Dynamic Host Configuration ProtocolNAT & PATDNS — Domain Name SystemNTP — Network Time ProtocolSyslogQoS BasicsSNMP — Simple Network Management ProtocolIGMP & IGMP SnoopingNTP Authentication & SecurityDHCP Relay & IP Helper
Security (10)
Access Control Lists (ACLs)Port SecurityDHCP SnoopingAAA · RADIUS & TACACS+802.1X — Port-Based Network Access ControlVPN Basics — IPsec & SSLDynamic ARP Inspection (DAI)IP Source Guard (IPSG)Encryption FundamentalsCybersecurity Threats & Mitigation
Automation (7)
REST APIs for Network EngineersAnsible for Network EngineersJSON, YAML & XML for Network EngineersNETCONF & YANGPython for Network EngineersSDN & Controller-Based NetworkingAI & ML in Network Operations
CCNP Library (15)
Browse all CCNP topics → SPAN, RSPAN & ERSPAN — Port MirroringGRE TunnelsEIGRPOSPF Multi-AreaIPv6 Routing — Static & OSPFv3BGP BasicsTCP Connection StatesCisco AnyConnect / Remote Access VPNCisco ISE BasicsNetFlow & Flow-Based MonitoringgRPC & gNMI — Streaming TelemetrySD-WAN ConceptsMPLS BasicsCisco DNA Center / Catalyst CenterVRF Basics — Virtual Routing and Forwarding
Practice
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Troubleshooting Labs
OSPF neighbor never comes upA blocked host still reaches the serverThe LAN can’t reach the internetA VLAN won’t cross the trunk All troubleshooting labs →
Packet Tracer Labs
VLAN + Trunk Basics (Lab 4)Standard ACL Walk-throughExtended ACL Walk-throughOSPF Multi-Area LabABR & ASBR — Multi-Area OSPFOSPF Adjacency TroubleshootingEIGRP + OSPF — Same TopologyPort Security + DHCP Snooping + DAI (Lab 32)DHCP Snooping + Dynamic ARP InspectionPort SecurityStatic + Default RoutingNAT / PAT — Fix the LabSpanning Tree — Root Bridge ElectionSpanning Tree — Rapid STP (RSTP / Rapid-PVST+)Spanning Tree — PortFast, BPDU Guard & Root GuardEtherChannel — LACP BundleHSRP — Redundant Default GatewayIPv6 — Addressing & SLAAC All labs →
Interactive Simulators
Subnetting Visualizer · LiveOSPF Neighborship · LiveStandard ACL · LiveExtended ACL · LiveVLAN + Trunk Frame Walkthrough · LiveNAT / PAT Translation Walkthrough · LiveSpanning Tree (STP) · Live All simulators →
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Interactive Simulators

Networking concepts only make sense when you can move them. These run in your browser — slide a CIDR mask, send a frame through a trunk, watch STP converge. No installs, no Packet Tracer required.

Network Fundamentals Live

Subnetting Visualizer

Practice quiz on top. Below: slide a CIDR prefix and watch network, broadcast, host range, masks and the 32-bit boundary update live. VLSM splitter included.

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IP Connectivity Live

OSPF Neighborship

Cisco-IOS-style neighbor state machine. Click Advance Handshake, watch Hello/DBD/LSR/LSU envelopes move between R1 and R2, with live IOS syslog, packet analyzer, and show commands. Includes Hello mismatch + ACL block + MTU mismatch troubleshooting scenarios.

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Security Fundamentals Live

Standard ACL

Configure a numbered or named standard ACL on an interface, send test traffic, see permit/deny verdicts and matching IOS syslog. Includes implicit deny visualization and common-pitfall scenarios.

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Security Fundamentals Live

Extended ACL

Practice extended ACL syntax: protocol + source + destination + port. Build the entry, apply it, then run packets through and see which rule matches. Console output, ACL hit counters, and worked traffic scenarios.

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Network Access Live

VLAN + Trunk Frame Walkthrough

Send a frame from one PC to another across a switch trunk. Watch the 802.1Q tag get added on ingress and stripped on egress, with native VLAN and inter-VLAN scenarios included.

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IP Services Live

NAT / PAT Translation Walkthrough

Send packets from inside hosts to the internet and watch R1 rewrite the source IP (and port for PAT/overload), build the translation table live, then untranslate the reply. Static NAT, dynamic pool, and the classic ip-nat-inside/outside + ACL misconfig scenarios included.

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Network Access Live

Spanning Tree (STP)

Three switches in a triangle. Change the bridge priorities to elect any root, watch each port become Root / Designated / Blocked, then fail a link and watch the blocked port unblock and the tree reconverge in real time.

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