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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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Security Fundamentals Simulator

Standard ACL Simulator

Build a numbered or named standard ACL on R1. Send packets from PC-A/B/C to the server zone, watch them get permitted or denied. Implicit deny, shadow detection, and 6 exam scenarios baked in.

0Sent

0Permitted

0Denied

0Rules

0Shadowed

📡 Send Test Packet

Source

To

Speed

⚙️ ACL 10 — Rule Builder

📍 Standard ACL Placement Rule: Standard ACLs filter SOURCE IP only — they cannot see the destination. Always apply them as close to the destination as possible to avoid accidentally blocking traffic to other networks. This ACL is applied outbound on Gi0/1 (toward the server zone).

Remark

Action

Src IP

⚠️ Shadow detected: these rules can never be reached:

Seq	Action	Source IP / Wildcard	Hits	Order

📋 Scenario:

Practice — ACL fundamentals & edge cases

Score: 0 / 0

Mixed questions about ACL syntax, placement, wildcards, and exam traps. Next button on right and wrong.

Question

—

Drill this into reflex

When a 'deny any' lands two rules too high

1:1 mentorship with real ACL debug scenarios, lab reviews, and US interview prep. Free first session. No card on file.

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