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Khan Academy The Internet Study List Exam Questions and Answers Tiffany is helping a family member learn how to use Gmail. She notices the website is using a different font and logo, and that the emails are suspiciously worded: Tiffany suspects that has been compromised by a DNS spoofing attac...

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  • November 11, 2024
  • 36
  • 2024/2025
  • Exam (elaborations)
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Khan Academy The Internet Study List

Exam Questions and Answers


Tiffany is helping a family member learn how to use Gmail.


She notices the website is using a different font and logo, and that the emails are suspiciously worded:


Tiffany suspects that gmail.com has been compromised by a DNS spoofing attack.


Which of these are good next steps?


Note that there are 2 answers to this question. - ANSWER✔✔-Contact the Gmail team via social

media or phone




Close the Gmail tab


TCP/IP are the protocols that route data around the internet.


What are they each responsible for?


Note that there are 2 answers to this question. - ANSWER✔✔-IP is responsible for routing of packets

from source to destination across the internet.




TCP is responsible for reliable transmission of packets.


IP v4 addresses currently cost more to lease than in the past.



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What's the most likely explanation for why people are willing to pay more for IP v4 addresses now? -

ANSWER✔✔-There are very few available IP v4 addresses in the world, and the scarcity increases the

demand.


Over the years, engineers have invented many networking technologies for LANs (local area networks).

Many are still in use, and many of the very slow ones were abandoned long ago.


The following is a sampling of LAN technologies and their bandwidths.


Sort the technologies from lowest to highest bandwidth, with the lowest on the top and the highest on

the bottom:




"LocalTalk" @ 230 kbit/s


"Econet" @ 800 kbit/s


"Omninet" @ 1 Mbit/s


"FireWire" @ 400 Mbit/s


"Gigabit Ethernet" @ 1 Gbit/s


"Omni-Path" @ 100 Gbit/s - ANSWER✔✔-"LocalTalk" @ 230 kbit/s


"Econet" @ 800 kbit/s


"Omninet" @ 1 Mbit/s


"FireWire" @ 400 Mbit/s


"Gigabit Ethernet" @ 1 Gbit/s




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"Omni-Path" @ 100 Gbit/s


Startuppr is a web company that's running their servers out of their garage. Uptime is important to

them, so they pay for two internet service providers, Xfinity & Wave. The ISP routers then send their

server's packets to the rest of the internet.


Unfortunately, this network is not fault tolerant: there's still a single point of failure.


Which router needs to stay available for Startuppr servers to stay connected to the internet? -

ANSWER✔✔-Router A


NSFNET was an early internet connecting the computer science departments of universities. In 1986,

NSFNET connected 6 departments across the US:


Redundancy in a network makes it more fault-tolerant. When two computers in a network are connected

by multiple routes, that adds redundancy.


In this network, how many routes are between San Diego and Cornell? - ANSWER✔✔-4 routes


D'Andre is riding a train with wireless internet service. When he logs online, he sees a warning that the

wireless network has limited bandwidth.


Which online activities are most likely to be affected by limited bandwidth?


Note that there are 2 answers to this question. - ANSWER✔✔-Watching online movies




Downloading a large application


Which of these could be a valid IP v4 or IP v6 address?


Note that there may be multiple answers to this question. - ANSWER✔✔-192.168.17.43


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2001:0db8:85a3:03eF:7cb3:8a2e:0370:7334


Which of these is the best description of the domain name system (DNS)? - ANSWER✔✔-The domain

name system associates domain names with IP addresses, like "www.youtube.com" with

208.65.153.251.


Each IP packet contains a sequence number.


What is the primary purpose of the sequence number? - ANSWER✔✔-It helps the receiving computer

reassemble the packets.


Comcast, an Internet Service Provider in the US, has many IP addresses that it can assign to its

customer's computers. One IP address is 24.128.139.211.


Which explanation best describes the hierarchical nature of that address? - ANSWER✔✔-The first part of

the address (24.128) identifies the network (Comcast) and the second part (139.211) identifies the

individual customer.


Nadia is at an internet cafe in Paraguay, where the download speed is 600 kbps. She's chatting with her

friend Jun in Singapore, where the download speed is 60 Mbps.


How much faster is Jun's speed than Nadia's? - ANSWER✔✔-100x


Consider the website:


help.donorschoose.org


That website hosts the help center for DonorsChoose, a site where teachers can fundraise for

classrooms.



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