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csev / net-intro

Introduction to Network Technology
http://www.net-intro.com/
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C4 quiz #4

Open cadenzasong opened 6 years ago

cadenzasong commented 6 years ago

4.16 About how long does it take for a packet to cross the Pacific Ocean via an undersea fiber optic cable? 0.0025 Seconds 0.025 Seconds 0.250 Seconds 2.5 Seconds

I think the answer should be: "0.250 Seconds.", rather than "0.025 Seconds"

4.20 How much larger are IPv6 addresses than IPv4 addresses? They are the same size IPv6 addresses are 50% larger than IPv4 addresses IPv6 addresses are twice as large as IPv4 addresses IPv6 addresses are 10 times larger than IPv4 addresses

Shouldn't it be 4x as large? (128 bits vs 32 bits)

4.21 What does it mean when your computer receives an IP address that starts with "169.."? Your connection to the Internet supports the Multicast protocol The gateway is mapping your local address to a global address using NAT There was no gateway available to forward your packets to the Internet The gateway for this network is a low-speed gateway with a small window size

I think the answer should be: "There was no gateway available to forward your packets to the Internet", rather than "The gateway is mapping your local address to a global address using NAT"

mrarcademachine commented 2 years ago

I've just reached this part of the book myself, and these quiz answers seem improper to me as well.

quokka-qurious commented 1 year ago

I also think 4.16 should be 0.25 seconds to match what it says in the chapter.

0xArDANT commented 3 months ago

I did the same remarks on these 3 questions by @cadenzasong And also for the second question :

How many different physical links does a typical packet cross from its source to its destination on the Internet? 1 4 ✓ 15 255

Shoudn't the answer be 20 like it is mentionned in the book ? Also here: https://web.stanford.edu/class/archive/cs/cs106a/cs106a.1216/handouts_w2021/lecture-25-internet.html , it's about 10-20 hops, so 15 is a good answer too. Maybe the question should be "How approximatively many different ..."