The Best Things to Include in Your CCNA Exam Cheat Sheet

The CCNA can feel overwhelming. There is a huge amount of networking concepts, commands, and troubleshooting steps. You’re expected to remember many details, which is why creating a focused CCNA exam cheat sheet can be helpful. If your exam allows a digital notes sheet, stay organized. You can also prepare a mental cheat sheet before walking in. The key is to keep things short, simple, and practical.

Here are the most useful things to include so you can stay calm and focused during the exam.

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1. Subnetting Shortcuts

Subnetting is a big part of the CCNA. Even if you’re fast at it, having quick references helps.

Add these to your sheet:

• /24 → 256 addresses → 254 usable
• /25 → 128 addresses
• /26 → 64 addresses
• /27 → 32 addresses
• /28 → 16 addresses
• /29 → 8 addresses
• /30 → 4 addresses (point-to-point)

Also include the magic numbers:

• /26 → increments of 64
• /27 → increments of 32
• /28 → increments of 16
• /29 → increments of 8

You don’t need to calculate everything from scratch — these shortcuts save time.

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2. Common Cisco Commands You Must Know in Your CCNA Exam Cheat Sheet

Write down the commands you always mix up or forget under pressure.

Examples:

Basic device management

enable

configure terminal

copy run start

show running-config

show ip interface brief

Routing

show ip route

router ospf 1

network x.x.x.x <wildcard> area 0

router eigrp 1

network x.x.x.x 0.0.0.255

Interface

interface g0/0

ip address x.x.x.x y.y.y.y

no shutdown

If you can configure interfaces and routing quickly, you’re already ahead.

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3. OSI vs TCP/IP Layers

A quick reminder helps when answering conceptual questions.

OSI

1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application

TCP/IP

• Network Access
• Internet
• Transport
• Application

You don’t need full definitions — just the order.

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4. VLAN and Trunking Essentials

VLAN questions appear a lot in CCNA exams.

Include on your sheet:

• switchport mode access
• switchport access vlan X
• switchport mode trunk
• switchport trunk allowed vlan X,Y,Z
• Native VLAN = untagged traffic
• Trunk = carries multiple VLANs

A simple 1-line mental rule:

Access = 1 VLAN. Trunk = many VLANs.

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5. Spanning Tree Protocol Quick Rules

Just the basics you always need:

• Root Bridge = lowest BID
• Priority default = 32768
• Port roles: Root, Designated, Alternate
• PortFast = for hosts
• BPDU Guard = blocks if BPDU detected

You don’t need to memorize the entire STP behavior — just these core points.

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6. IPv6 Essentials (because CCNA loves IPv6)

Add these:

• Link-local starts with fe80::
• Global unicast starts with 2*
• ipv6 unicast-routing (don’t forget!)
• show ipv6 interface brief
• Abbreviation rules
  • Remove leading zeros
  • Replace longest sequence of 0000 with :: (once only)

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7. Routing Protocol Differences

A simple table helps you avoid exam traps.

OSPF

• Link-state
• Area-based
• Metric: cost
• Uses SPF algorithm

EIGRP

• Advanced distance-vector
• Metric: bandwidth + delay
• Fast convergence
• Uses DUAL

You don’t need full theory — just enough to answer comparison questions.

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Need Extra Help?

You can prepare faster with our CCNA Real Exam Questions PDF, designed to be brutally effective for last-minute review.

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Final Thoughts

Your CCNA cheat sheet doesn’t need to be long — it just needs to be useful. Focus on the topics that actually show up in the exam: subnetting, VLANs, routing, IPv6, and essential commands.

Keep things simple, stay calm, and trust your preparation.

You’ve got this.