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Flip to reveal answersName the four TCP/IP layers in order.
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All 5 Flashcards — The TCP/IP model
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Question
Name the four TCP/IP layers in order.
Answer
**Application** (what it means) · **Transport** (did it all arrive) · **Internet** (which host) · **Link** (across this medium).
Question
What is encapsulation?
Answer
Each layer **wraps** what it was given in its own header on the way down, and **removes its own** on the way up.
Question
IP or MAC — which changes at each hop?
Answer
The **MAC address** is rewritten at every hop, because it names only the next device on this link. The **IP address is unchanged** end to end.
Question
TCP or UDP for a live video call?
Answer
**UDP.** TCP would retransmit a lost frame and hold everything behind it — but by then the frame is already in the past, and the pause freezes the call.
Question
What does layering buy?
Answer
Each layer depends only on the **interface** of the one below, so swapping Wi-Fi for Ethernet changes nothing above the link layer.
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Topic 2.1 hub
Network fundamentals
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Computer Science exam skills
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