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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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Network Access CLI lab Analyze & fix

A VLAN won’t cross the trunk — on the CLI

VLAN 20 hosts can’t reach the other switch even though VLAN 10 works across the same trunk. Find why VLAN 20 isn’t crossing and restore connectivity. Type real Cisco IOS commands — abbreviations and Tab-completion work — to find the fault and fix it.

Hands-on CLI lab · type real IOS commands

Practice lab

Objectives

Discover commands like the real exam: type ? anywhere (e.g. show ? or ip ospf ?). Tab completes · ↑ recalls.

console

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