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CCNA Library (74)

Browse all CCNA topics →

Network (13)

OSI Model & TCP/IP IPv4 Addressing TCP vs UDP Subnetting IPv6 Basics ARP — Address Resolution Protocol ICMP — Internet Control Message Protocol TCP 3-Way Handshake Cabling & Media Standards MTU & Fragmentation WAN Connection Types Hierarchical Network Design Network Virtualization & Containers

Device Operations (5)

Cisco IOS Device Management Power over Ethernet (PoE)Cisco IOS File System Password Recovery & Configuration Register Network Troubleshooting Methodology

Network Access (12)

MAC Address Table VLANs Trunks & 802.1Q Tagging Spanning Tree Protocol (STP)EtherChannel (Link Aggregation)Switching Operation CDP & LLDP — Neighbor Discovery BPDU Guard & Root Guard Catalyst Boot Process VTP — VLAN Trunking Protocol Rapid STP & MSTP Private VLANs (PVLAN)

Wireless (6)

Wireless LAN Basics WLAN Architectures — Autonomous, Centralized (WLC), Cloud, Embedded Wi-Fi Security — WEP, WPA, WPA2, WPA3 Wi-Fi 6, 6E, and 7 Features Wireless RF Fundamentals Access Point Operating Modes

IP Connectivity (10)

Inter-VLAN Routing Static Routing Default Routing Routing Decision Process FHRP — HSRP, VRRP & GLBP Layer-3 Switch & SVI Routing OSPF Single-Area Route Summarization IPv6 SLAAC & DHCPv6 IPv6 Transition Mechanisms

IP Services (11)

HSRP vs VRRP vs GLBP — FHRP Compared DHCP — Dynamic Host Configuration Protocol NAT & PAT DNS — Domain Name System NTP — Network Time Protocol Syslog QoS Basics SNMP — Simple Network Management Protocol IGMP & IGMP Snooping NTP Authentication & Security DHCP Relay & IP Helper

Security (10)

Access Control Lists (ACLs)Port Security DHCP Snooping AAA · RADIUS & TACACS+802.1X — Port-Based Network Access Control VPN Basics — IPsec & SSL Dynamic ARP Inspection (DAI)IP Source Guard (IPSG)Encryption Fundamentals Cybersecurity Threats & Mitigation

Automation (7)

REST APIs for Network Engineers Ansible for Network Engineers JSON, YAML & XML for Network Engineers NETCONF & YANG Python for Network Engineers SDN & Controller-Based Networking AI & ML in Network Operations

CCNP Library (15)

Browse all CCNP topics → SPAN, RSPAN & ERSPAN — Port Mirroring GRE Tunnels EIGRP OSPF Multi-Area IPv6 Routing — Static & OSPFv3 BGP Basics TCP Connection States Cisco AnyConnect / Remote Access VPN Cisco ISE Basics NetFlow & Flow-Based Monitoring gRPC & gNMI — Streaming Telemetry SD-WAN Concepts MPLS Basics Cisco DNA Center / Catalyst Center VRF Basics — Virtual Routing and Forwarding

Practice

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Troubleshooting Labs

OSPF neighbor never comes up Multi-area OSPF: area 1 can’t reach area 0 A blocked host still reaches the server Port-security err-disabled a legitimate host The LAN can’t reach the internet Clients aren’t getting an IP from the DHCP server NTP sync never reaches stratum VLAN 10 and VLAN 20 hosts can’t reach each other A VLAN won’t cross the trunk STP elected the wrong root bridge EtherChannel bundle never forms HSRP failover never happens A remote LAN is unreachable — static route missing All troubleshooting labs →

Packet Tracer Labs

VLAN + Trunk Basics (Lab 4)Standard ACL Walk-through Extended ACL Walk-through OSPF Multi-Area Lab ABR & ASBR — Multi-Area OSPF OSPF Adjacency Troubleshooting EIGRP + OSPF — Same Topology Port Security + DHCP Snooping + DAI (Lab 32)DHCP Snooping + Dynamic ARP Inspection Port Security Static + Default Routing NAT / PAT — Fix the Lab Spanning Tree — Root Bridge Election Spanning Tree — Rapid STP (RSTP / Rapid-PVST+)Spanning Tree — PortFast, BPDU Guard & Root Guard EtherChannel — LACP Bundle HSRP — Redundant Default Gateway IPv6 — Addressing & SLAAC All labs →

Interactive Simulators

Subnetting Visualizer · Live OSPF Neighborship · Live Standard ACL · Live Extended ACL · Live VLAN + Trunk Frame Walkthrough · Live NAT / PAT Translation Walkthrough · Live Spanning Tree (STP) · Live DHCP DORA Simulator · Live HSRP Failover Simulator · Live IPv6 SLAAC Boot Simulator · Live TCP Handshake Simulator · Live EIGRP Successor / FS Simulator · Live EtherChannel LACP Simulator · Live CDP / LLDP Neighbor Discovery · Live Route Summarization / CIDR Aggregation · Live All simulators →

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Network Access Simulator

EtherChannel — bundle-formation matrix

Two switches with four cables between them. Pick a channel-group mode on each switch. Watch show etherchannel summary live — does the bundle form? Is STP still blocking? Which flag does each member get?

SW1 mode (channel-group 1 mode …) SW2 mode

SW1 · show etherchannel summary

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SW2 · show etherchannel summary

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Verdict

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Practice — quick check

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