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- <p>So far we have seen very basic packets. These packets have shown only the source (who sent the packet) and the
- destination (who received the packet). In this level, we will see a more complex packet that will give the recipient
- information about how to respond.
- <p>Pause the simulation to view the packet sent from Alice's computer to Google. There is a new header under the
- <strong>transport layer</strong>. The header, <strong>proto</strong> defines the <strong>protocol</strong> that will
- be run on this layer. The protocol listed is <strong>ICMP</strong>, which is used to <strong>ping</strong> computers. When a
- computer receives a packet with an ICMP echo request (ping) they respond by sending back a packet with an ICMP echo
- (pong). Resume the simulation and notice the response packet sent from Google to Alice's computer.
- <h3>Level Objectives</h3>
- <ul>
- <li>To complete this level, you must send 4 more ICMP echo requests from Alice to Google. Proceed as before, by clicking the + to add new packets. Remember to fill in the new <strong>transport layer</strong> header proto header field.</li>
- </ul>
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