Lab nf-11 - Troubleshooting Layer 1 / 2 / 3 Symptoms
When the network breaks, the engineer who fixes it first is the one with a method. Trial-and-error works
Labs
Hands-on Cisco IOS XE lab walkthroughs. Each lab ships with a real CML topology, configs you can paste, and verified show output. Articles tagged Labs cover the full CCNA 200-301 blueprint across Network Fundamentals, Network Access, IP Connectivity, IP Services, and Security Fundamentals.
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Lab nf-10 - GRE Tunnel Between Two Routers
GRE - Generic Routing Encapsulation - is the lightest-weight tunnel encapsulation in widespread use. It takes an IP packet, wraps it
Lab nf-09 - Configure PPP and CHAP on a Serial Link
PPP - Point-to-Point Protocol - is the WAN encapsulation that survived. Frame Relay died, X.25 died, ATM mostly died,
Lab nf-03 - IPv4 Addressing Essentials
Every IP packet on the planet starts and ends with two 32-bit numbers - the source and destination addresses. CCNA
Lab nf-07 - Static Routes: Next-Hop vs Exit-Interface
A static route on a Cisco router can be written two ways: with a next-hop IP address, or with
Lab nf-06 - Configure ARP and Static ARP
ARP - the Address Resolution Protocol - is the unsung mechanism that makes Layer 3 routing actually work over Layer 2 Ethernet.
Lab nf-05 - IPv6 Addressing and EUI-64
IPv6 has been "the new thing" for so long that engineers sometimes forget it is now the default
Lab nf-02 - IOS XE CLI Survival
The IOS XE command-line interface is the language you will type into every Cisco router in this library. Hundreds
Labs
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Lab sec-02 - Standard ACL (Numbered)
Standard access lists filter traffic based on source IP only. Numbered standard ACLs use IDs 1-99 and 1300-1999.
Labs
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Lab ipc-04 - OSPF Single-Area
OSPF (Open Shortest Path First) is the link-state protocol that powers most enterprise networks. Single-area OSPF puts every
Labs
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Lab na-03 - VLANs, Trunks, and VTP
VLANs work fine on a single switch. The minute you have two switches and want VLAN 10 on both, you
Labs
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Lab nf-04 - IPv4 Subnetting with VLSM
Variable-Length Subnet Masking is the skill that turns a CCNA candidate into someone who can stand at a whiteboard