Practice
Practice & Labs
Reading explains a topic; practice makes it stick. Drill the calculations, predict what a packet does, configure a lab network and test yourself. No account needed.
- Labs
- 11
- Course tests
- 7
- Packet-flow exercises
- 4
Drills
Quick, repeatable practice with an answer and an explanation every time.
- Subnetting practiceUnlimited questions at three levels, each with a worked answer.
- CCNA practice questions215 exam-style questions by domain; study mode or timed exam mode.
- CCNA flashcards215 cards with spaced repetition: the ones you miss come back first.
- Find the subnetting mistakeSeven answers, each with one error to spot and fix.
Packet-flow exercises
Pick what happens and watch the frame and packet addresses change at every hop.
- Printer or website: where does the frame go?Choose a destination and follow the frame and packet addresses.Networking basics
- ARP: empty cache, cached, or no replyPredict when a host broadcasts and what happens when nobody answers.ARP
- OSI: where does it break?Pick a fault and find the lowest layer that fails.OSI model
- VLANs: same VLAN, broadcast or another VLANFollow a frame across an 802.1Q trunk.VLANs and trunks
CCNA labs
Plan, configure and verify a small network, then break it on purpose and fix it. Use Cisco Packet Tracer, a lab emulator or paper.
- Lab: static routing across three routersBuild full reachability between three sites with static and default routes, then test it.Routing
- Lab: single-area OSPF on three routersPlan, configure and verify OSPF on the three-router network, then find and fix the three most common faults.OSPF
- Lab: HSRP gateway failoverConfigure HSRP with preempt and tracking on two routers, then predict which router forwards after each kind of failure.First-Hop Redundancy
- Lab: static NAT and PATPublish a web server with static NAT and give an office internet access with PAT.NAT
- Lab: IPv6 addressing and static routesAddress two routers, route between three IPv6 networks in both directions, check what a PC learns by SLAAC, and fix the common faults.IPv6 Configuration
- Lab: writing and placing ACLsTurn a written policy into an extended ACL and a VTY access-class, predict what each test packet meets, and fix three classic mistakes.Security Fundamentals
- Lab: manual STP computationWork out the root bridge, every port role and the blocked port on paper, then check your answer.Spanning Tree
- Lab: Spanning Tree customizationMake different switches root for different VLANs and steer traffic onto the links you choose.Spanning Tree
- Final configuration labDesign and configure Spanning Tree for a two-tier campus, including every protection feature.Spanning Tree
- Final troubleshooting labSix broken networks: read the symptoms and the output, find the cause, then check your answer.Spanning Tree
Troubleshooting labs
Work through a broken network from symptom to fix.
Course tests
Check a whole course at once. Every wrong answer explains why, and points to the lesson to revisit.
- Test: troubleshootingCheck your understanding of the whole course.Troubleshooting
- Test: TCP & UDPCheck your understanding of the whole course.TCP & UDP
- Test: network protocolsCheck your understanding of the whole course.Network Protocols
- Test: routingCheck your understanding of the whole course.Routing
- Test: OSPFTen questions on the whole course, each with an explanation.OSPF
- Test: NATCheck your understanding of the whole course.NAT
- Test: CST fundamentalsCheck your understanding of Modules 1 and 2.Spanning Tree