BitWithBite
CCNA Networking Worksheet
🌐 Network Security Fundamentals
SCORE___ / 20
NameClassDate
After this worksheet you can
Threat typesMalware categoriesDefense: AAA, firewalls, backupsDevice hardening📚 Quick Recap
🎯 What you'll learn: Common security threats and vulnerabilities, types of malware and network attacks, the defense-in-depth approach, key mitigations including firewalls and AAA, and how to harden a Cisco device with strong passwords and SSH.
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Self-replicating malware needing no host file:
2Disguised as legitimate software:
3Overwhelming a service with traffic is:
4AAA stands for:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5Fake emails stealing credentials = .
6A filters traffic between networks.
7Virus vs worm vs trojan - one line each.
8Basic device hardening steps?
9Why is accounting (logging) part of security?
🚀 Section C · Challenge ● CHALLENGE 5
10Defense in depth means?
💭 Reflection — the most useful thing I learned:
A ___/4 B ___/11 C ___/5 Total ___/20
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✂ answer key — fold or cut before handing out
1-A 2-A 3-A 4-A | 5 phishing 6 firewall 7 = Attaches to files; self-spreads over network; disguises as legit app 8 = Strong passwords/SSH, disable unused services/ports, patch, banner, AAA 9 = Detect, trace and prove what happened | 10 = Multiple overlapping layers - no single point of protection