BitWithBite
CCNA Networking Worksheet
🌐 Transport Layer
SCORE___ / 20
NameClassDate
After this worksheet you can
TCP vs UDPPort numbersThree-way handshakeReliability mechanisms📚 Quick Recap
🎯 What you'll learn: The role of the Transport Layer, TCP vs UDP and when each is used, TCP and UDP header fields, port numbers and socket pairs, the TCP three-way handshake and session termination, TCP reliability and flow control, and how UDP handles communication without those guarantees.
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Reliable, ordered delivery is:
2Low-overhead, connectionless is:
3The handshake is:
4Well-known ports range:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5HTTP(S) uses ports 80 and .
6DNS uses port .
7Why does DNS use UDP mostly but TCP sometimes?
8What do sequence numbers achieve?
9TCP vs UDP for online gaming - why UDP?
🚀 Section C · Challenge ● CHALLENGE 5
10What is a socket 192.168.1.5:443?
💭 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 | 5 443 6 53 7 = Small fast queries via UDP; large/zone transfers via TCP 8 = Reordering and loss detection 9 = Fresh data beats late retransmits; low latency wins | 10 = Endpoint = IP + port identifying one conversation