Routing Table Foundations

Covers Lesson 1 and Lesson 2

Checks the two things every later routing topic assumes: what a router actually does with a packet, and where the table's first entries come from.

Topics covered

• The per-packet forwarding loop and what happens with no match
• What is preserved and what is rewritten at each hop
• The three route sources and their codes
• Connected and local routes, and when they disappear

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 4 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.

Section quiz

Routing Table Foundations

8 questions covering Lesson 1 and Lesson 2. Answer each one before you see whether you were right.

Question 1 of 8

1. Which address in an arriving packet does a router use to make its forwarding decision?

2. A packet arrives for a destination that matches no route, and the router has no default route. What happens?

3. As a packet crosses a router, what is preserved and what is rewritten?

4. Where does the next-hop IP address from a route appear in the forwarded packet?

5. You give an interface the address 10.1.1.1/24 and bring it up. How many routes does that add, and what are they?

6. An interface is configured with 10.1.2.1/30. What prefix length does its L route use?

7. An interface has an IP address configured but is administratively down. What does it contribute to the routing table?

8. Which set correctly pairs the three route sources with their table codes?

Back to Lesson 2 Continue to Lesson 3

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