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CCNA Library (74)

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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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Security Fundamentals CLI lab Analyze & fix

A blocked host still reaches the server — on the CLI

An ACL is supposed to stop one host from reaching a server, but the host still connects. Find why it isn’t taking effect and make it block the right traffic — two valid fixes exist. 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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