Week 1 Checkpoint

Covers all six lessons and Lab 1

Confirms you can combine the clusters this week taught separately. Every question here spans at least two lessons — no item simply re-asks a section quiz.

Topics covered

• Tracing one message end to end across networks
• Addresses that change per hop versus addresses that survive
• Switch behaviour and the two kinds of domain
• Choosing a transport, and what ports do that IP addresses cannot
• Classifying addresses and knowing when NAT is required
• Using the layer stack to decide what to check first

Every question here is answerable from the first-party notes of the lessons above. You commit to an answer before you see whether it was right.

This quiz is a Week 1 milestone in its own right. Passing it does not change the completion state of any individual lesson, and you do not need it to finish the lessons it covers.

Weekly checkpoint

Week 1 Checkpoint

12 questions covering all six lessons and Lab 1. Answer each one before you see whether you were right.

Question 1 of 12

1. A workstation at 10.10.0.5 pings a server at 203.0.113.20. Before the very first packet leaves, what must the workstation resolve, and by what means?

2. In that same first frame, what is the destination IP address inside the packet?

3. That packet crosses two routers. Which fields are different when it arrives compared to when it left, and which are identical?

4. A host sends an ARP request on a network built from one switch with eight ports, all in use. Which devices receive that frame, and why?

5. A link between two switches reports up / down. Using the layer stack as a checking order, what have you already ruled out and what should you examine?

6. A ping to a server times out. Which conclusion is actually justified?

7. A live voice call and a file download run over the same network. Which transport suits each, and what is the Layer 4 PDU called in each case?

8. One server at a single IP address runs both a web service and an SSH service. What makes it possible to reach each one separately?

9. A workstation addressed 192.168.4.20 needs to reach a public web server. What has to happen at the network edge, and why?

10. A laptop that normally works shows the address 169.254.8.31 and cannot reach anything. What does that address tell you?

11. At which OSI layer do port numbers live, and what is the PDU at that layer called when the transport is TCP?

12. An old hub is replaced by an eight-port switch. What changes for collision domains and broadcast domains?

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