If you're studying for CCNA, you've probably seen the exam details by now.
170 minutes. Around 100 questions. Six domains covering routing, switching,
security, and automation.
Here's what most guides skip: people who fail CCNA don't fail because they're
not capable. They fail because they studied the wrong things, in the wrong order,
without enough practice.
This is the plan I'd follow starting today.
Week 1-2: Build the Foundation Before Anything Else
Don't touch OSPF or ACLs until these four are solid:
- OSI Model - know all 7 layers and what happens at each one
- IPv4 Subnetting - non-negotiable. You need to do this fast, in your head
- TCP/IP fundamentals - how packets travel from source to destination
- Ethernet and switching basics - MAC addresses, how a switch forwards frames
Subnetting shows up in roughly 15-20% of exam questions, directly and indirectly.
Spend at least 5-6 hours on it before moving on. Use a site like
subnettingpractice.com and drill until it's automatic.
Week 3-4: Routing and Switching Core
Once the foundation is solid, tackle these in order:
- Static routes - configure, troubleshoot, know when to use them
- OSPF single area - this is heavily tested. Learn hello packets, DR/BDR election, and neighbour states
- VLANs and trunking - access vs trunk ports, 802.1Q encapsulation
- STP - understand why it exists, how port states work, what BPDU does
- Inter-VLAN routing - router-on-a-stick and Layer 3 switching
For each topic: read the theory, then immediately configure it in a lab.
Don't read three chapters before touching a command line.
What Lab Tool Should You Use?
Cisco Packet Tracer is free and covers most CCNA topics. Download it from
Cisco's NetAcad portal.
For more realistic scenarios, EVE-NG is a better choice. It runs actual
Cisco IOS images and behaves closer to production equipment - which is also
closer to what you'll see in the hands-on exam questions.
If you learn better with structure and guidance than solo study,
SMEnode Academy runs live instructor-led CCNA
courses built on EVE-NG with real topology scenarios. You get direct access to
an instructor during labs rather than figuring out why a config isn't working
on your own at 11pm.
Week 5-6: Security, WAN, and Automation
These are the topics people leave to last. Don't.
Security (about 15% of the exam):
- Port security on switches
- ACLs: standard vs extended, where to place them on the network
- NAT/PAT: how private-to-public address translation works
- DHCP snooping and dynamic ARP inspection
WAN concepts:
- PPP and HDLC at a conceptual level
- SD-WAN fundamentals (these appear in newer exam versions)
- VPN basics: IPsec vs SSL, site-to-site vs remote access
Automation and programmability (about 10%):
- REST APIs: HTTP verbs (GET, POST, PUT, DELETE)
- JSON: be able to read it, not necessarily write it
- SDN concepts: control plane vs data plane separation
- Cisco DNA Centre at a conceptual level
Don't panic about automation. The exam doesn't ask you to write Python scripts.
It tests whether you understand the concepts.
Week 7-8: Practice Exams Only
Two weeks out: stop reading new material. Only practice exams and review.
Take a full practice exam every two days. Scoring under 80%? Go back to every
wrong answer and understand why it was wrong, not just what the correct answer
was.
Good sources for practice questions:
- Boson ExSim - widely considered the most realistic
- Wendell Odom's Official Cert Guide - includes solid question banks
- Cisco's official practice exam via the Pearson Vue portal
When you're consistently hitting 80-85%, you're ready to book the exam.
Common Mistakes That Cause Failures
Watching videos without doing labs. Videos feel productive. They're not
enough on their own. Every topic needs hands-on time.
Memorising commands without understanding them. The exam shows you
an output and asks what's wrong. If you don't understand the protocol, you
can't interpret the output.
Skipping automation topics. 10% of the exam is a significant chunk of marks
to give away because it felt intimidating.
Using only one resource. Wendell Odom's book is the gold standard, but
mixing in video content and labs improves retention significantly.
60-Day Timeline at a Glance
| Week | Focus |
|---|---|
| 1-2 | OSI model, subnetting, TCP/IP, Ethernet basics |
| 3-4 | Static routing, OSPF, VLANs, STP, Inter-VLAN routing |
| 5 | Security topics, WAN concepts |
| 6 | Automation and programmability, full review |
| 7-8 | Practice exams, targeted weak-spot review |
CCNA is genuinely passable with the right approach. The candidates who fail
usually rushed through the first two weeks. Master subnetting early. Lab every
topic you read about. Don't skip automation.
Good luck with the exam.
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