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CCNA Networking Worksheet
🌐 Network Layer
SCORE___ / 20
NameClassDate
After this worksheet you can
IPv4/IPv6 roleRouting basicsHost forwarding decisionIP header essentials📚 Quick Recap
🎯 What you'll learn: Network layer characteristics (connectionless, best effort, media independent), IPv4 packet header fields, IPv6 improvements and header, how hosts make forwarding decisions, the default gateway, and an introduction to routing (static vs dynamic).
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Layer 3 provides:
2Routers forward based on:
3A host sends off-network traffic to its:
4TTL prevents:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5IP is connectionless and -effort.
6The default is the router interface for the LAN.
7Host decision: local or remote destination - how?
8Three route sources in a table?
9Why is IP best-effort acceptable?
🚀 Section C · Challenge ● CHALLENGE 5
10What happens at TTL 0?
💭 Reflection — the most useful thing I learned:
A ___/4 B ___/11 C ___/5 Total ___/20
Teacher's Signature
Parent's Signature
✂ answer key — fold or cut before handing out
1-A 2-A 3-A 4-A | 5 best 6 gateway 7 = ANDs destination with its subnet mask; same network = direct, else gateway 8 = Directly connected, static, dynamic (routing protocols) 9 = Upper layers (TCP) add reliability when needed | 10 = Packet dropped; ICMP time-exceeded returned (traceroute uses this)