Internet of Things: How did we get here? Coursera Quiz Answers

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Internet of Things: How did we get here? Week 01 Quiz Answers

Q1. What are the three technologies that had a huge impact on humanity in terms of information?

• Telephone
• Internet
• Fire
• Printing press
• Steam Engine

Q2. Which of the following is not an IoT application found in the intro video?

• Healthcare
• Remote Monitoring
• Home Automation
• Self-driving automobiles
• Machine Learning and AI

Q3. What does the right side of the video control about the audio?

• Tempo
• Noise
• Beat
• Melody
• Volume

Quiz 2: Intro Module

Q1. What is the oldest broadcast technology that you learned in this course?

• AM Radio
• T​elevision
• Telephone
• Printing press
• I​nternet

Q2. Which of the following is not an IoT application found in the intro video?

• Home Automation
• Machine Learning and AI
• Remote Monitoring
• Healthcare
• Self-driving automobiles

Q3. What does the right side of the video control about the audio?

• Melody
• Tempo
• Noise
• Volume
• Beat

Q4. What is the purpose of Physionet in Capstone 2?

• Provide medical data
• Visualize the data.
• Act as the internet interface.
• Store the data being streamed.
• Streams the data to the cloud

Q5. What interactive resource is available once a week?

• OpenHours
• 96Boards Forum
• 96Boards newsletter
• IRC
• 96Boards YouTube

Quiz 3: Lesson 1

Q1. Why did humans need language when we were hunting with tools?

• We always used language.
• We didn’t need it
• It was just the natural way to communicate
• We liked to talk about our lives while hunting.
• Their hands became full and we needed a way of communicating

Q2. What altruistic background did Alexander Graham Bell have in speech before he invented the Telephone?

• Was a volunteer speechgiver
• Worked on audio amplifiers
• Worked on the telegraph lines
• Taught a class on giving speeches
• Taught the deaf how to communicate in alternate ways

Q3. nWhat system did ATT create to avoid having direct connections between all users and reduce the number?

• A network of directly connected users.
• A star network where users connect to a central hub
• A network of inter-connected computers
• A distributed network
• A hub that connected to everyone’s computers

Q4. What two changes did ATT need to make to De Forest’s vacuum tube?

• Allow it to work with higher voltages, add gas
• Allow it to work with lower voltages, remove the gass
• Allow it to work with lower voltages, add gas
• None are correct
• Allow it to work with higher voltages, remove the gas

Q5. With regard to the “Early Days” part of the “History of Bell Systems” reading, which of the following is false?

• C.M. described an electric telegraph based on static electricity.
• The reason for the silence in response to C.M. was that static electricity is too limited to be effective in telegraphy.
• The electric telegraph developed slowly between 1753 and 1838.
• The electric telegraph never caught up to the Chappe System.
• Visual telegraph systems were instituted in England and America as well when it was found how well they worked in France

Quiz 4: Lesson 2

Q1. Which of the following is false?

• de Forest earned an Oscar award for putting sound in movies.
• de Forest is the self-proclaimed father of radio.
• In 1913, de Forest sold the patent rights to the triode to ATT for $50,000.
• de Forest had a pension for legal battles.
• In 1914, de Forest, he sold all rights to the vacuum tube for another $90,000 to ATT.

Q2. What caused de Forest and E.H. Armstrong to both be ruined financially?

• fraud
• depression
• medical problems
• constant failed inventions
• continual lawsuits

Q3. What major modern news network did RCA continue to create?

• FOX
• ABC
• CNN
• NBC
• CBS

Q4. In the entertainment industry, what is king?

Answer: Content

Q5. In 1953, ATT described their system using this. What was its name?

• The Magic of ATT Networks
• The Magic of Communication
• How ATT Works
• How ATT Networks Work
• Communication

Quiz 5: Lesson 3

Q1. According to Nyquist, at what KHz frequency do we need to properly sample a signal with a bandwidth of 4KHz?

Answer: 8khz

Q2. What is the significance of simultaneous masking?

• Some data points do not need to be represented.
• Speech signals must be larger than normal.
• We can transfer data at lower voltages.
• We can transfer data at higher voltages.
• More data points need to be represented.

Q3. What does the encoder add more of that compression strips away?

• Quality
• Redundancy
• Entropy
• Voltage
• Clarity

Q4. Who of the following was awarded a Nobel Prize in Physics for the invention of the transistor?

• Lee de Forest
• Walter Brattain
• John Bardeen
• Claude Shannon
• William Shockley

Q5. Which of the following are based on Unix?

• Linux
• Android
• Windows
• iOS
• OSX

Quiz 6: Lesson 4

Q1. Which of the following companies became part of ATT when Theodore Vail went on in his buying spree?

• Bell Labs
• Comcast
• Verizon
• Western Electric
• Independent Exchanges

Q2. Which of the following is false?

• In 1984, ATT did not break up.
• In 1914, ATT agreed to lease long-distance networks to independent exchanges.
• In 1921, the Willis Graham Act allowed ATT to acquire more local companies.
• In 1989, the lawsuit against Western Electric forced ATT to agree not to get into the computer business.
• In 1968, the FCC ruled in favor of Carterfone and attaching a wireless transceiver.

Q3. Even though Bell Labs was part of a much larger bureaucratic monopolistic company, they were able to have a huge impact on research. Is this true or false?

• True
• False

Q4. According to the network effect, if a network has a cost of 10, what is its value?

Answer: The value is not determined solely by cost; it depends on various factors.

Q5. What is the name of the device that ATT sued a man in Texas for in 1968?

Answer: Carterfone

Quiz 7: Lesson 1

Q1. Which of the statements are false?

• One of the media access control methods that might be used in circuit switching include frequency-division multiple access.
• The primary use of packet switching is cell phone service.
• A packet is defined by a frame with the network layer header prepended to it.
• The forwarding mechanism that is used in packet switching is store-and-forward, in which the packets are stored until it is fully processed and then forwarded to the next hop.
• None of the above

Q2. Select the correct protocol data unit and protocol pair.

• segment – User Datagram Protocol
• packet – Internet Protocol
• segment – Transport Control Protocol
• packet – Address Resolution Protocol
• frame – Ethernet

Q3. What is the argument that states that completeness and correctness must be satisfied for functionality to be implemented at a lower layer? Give one word with hyphens.

Answer: Layering

Q4. Because IP is in the center of the Internet architecture, what shape is commonly associated with the Internet? A hint is that there are many protocols in the link layer and the application layer. There are fewer protocols in the transport layer, but there is only IP in the network layer.

Answer: Triangle

Q5. Which of these statements are true?

• The two things that the IETF looks for in new software are “rough consensus and running code.”
• One of the features of UDP is reliability.
• An advantage of wireless communication over Ethernet is that communication can be full duplex meaning that communication can happen in both directions simultaneously.
• The 4-layer model for connecting computers is called the OSI architecture.
• None of the above

Quiz 8: Lesson 2

Q1. An important document concerning email was written in September 1973. Which of the following information is contained or implied in this document?

• Greenwich Mean Time is one of the zones that can used within the network mail header.
• The keywords are case-sensitive.
• There are restrictions concerning the format of the day of the month. The day of the month must always be expressed as 2 decimal digits. Therefore, the 4th of any month must be represented as 04.
• Other than the month of May, all the months must be represented as 4 letters.
• In order to transmit network mail over the FTP connection, one must utilize the MAIL command.

Q2. Which of the statements is false?

• Raymond Tomlinson joined Bolt Beranek and Newman, which is now known as Raytheon BBN Technologies.
• The Network Control Program is a transport layer protocol that was replaced by the Transmission Control Protocol.
• DNS must be used in order to attain the record for the domain of the receiver, which is the part located to the right of the @ symbol.
• One of the reasons that SMTP stopped using only ASCII characters was due to international emails, which demanded more characters.
• None of the above

Q3. What is the popular nickname for the person who wrote the first web client and server?

Answer: Tim Berners-Lee is often referred to as the inventor of the World Wide Web.

Q4. Name the three fundamental parts of the web from its creation to even now. Keep the answers separated by commas and answer the question in alphabetical order. For example, “IP, TCP, UDP” would be validly formatted, ignoring the quotations.

Answer: HTML, HTTP, URL

Quiz 9: Lesson 3

Q1. Before CIDR was announced, IP addresses were separated into different classes. What are the bits that represent a class E address in this class-based addressing scheme?

• 10
• 1110
• 110
• 111
• None of the above

Q2. What is another name for the address equivalent to a mask that will return the IP address itself whenever used correctly? In order to use the mask, you have to use a bit operation between the mask and the IP address.

Answer: Loopback address (127.0.0.1)

Q3. What is the minimum number of bits, for which the checksum from the IPv4 header will detect errors successfully every time?

Answer: The IPv4 checksum is 16 bits long, so it can detect errors when at least one bit is in error.

Q4. Which of these statements is true?

• BGP is the short name for a protocol that provides internetwork routing and is based on TCP.
• The first set of additional nodes on the ARPANET were UC Santa Barbara and the University of Utah.
• The Cerf/Kahn paper described a protocol called UDP, which would provide the transport layer for the Internet.
• The IAB also reformatted its infrastructure by combining the Task Forces in order to create the IRTF chaired by Leiner.
• DARPA supported UC Berkeley to make changes to the Unix OS because of the evolutions in different protocols such as TCP/IP.

Internet of Things: How did we get here? Week 02 Quiz Answers

Quiz 1: Lesson 1

Q1. Given a signal voltage of 4 millivolts and a noise voltage of 40 microvolts, what is the signal-to-noise ratio in decibels? Write your answers without the units and as an integer.

Asnwer: signal-to-noise ratio is 40 dB.

Q2. Signalling System 7 (SS7) is a communication protocol in public switched telephone networks (PSTN):

• Is based on Dual Tone Multifrequency signals sent along voice data in PSTN for call control.
• Is a packet-switched protocol that was a building block of the Internet.
• That uses multi-frequency tones for setting up calls between two users.
• Is a packet-switched protocol used for setting up and tearing down calls, that became adopted internationally.

Q3. Which of these characteristics is representative of the mu-law, but not the A-law?

• This provides a better signal/distortion performance when it deals with low-level signals.
• Out of the two, this provides a shorter dynamic range.
• It needs 13 bits for the uniform PCM equivalent.
• The most significant bit for the word identifies the polarity.
• This is used primarily in Europe.

Q4. What is the theoretical load capacity for the A-law? You do not need to put the units

Answer: The theoretical load capacity for the A-law is 30 channels.

Quiz 2: Lesson 2

Q1. Which of these are not true facts about “The Big 5”?

• In Berlin, Siemens manufactured the first electronically controlled telephone exchange.
• Ericcson started off as a company focused on repairing telegraph instruments.
• McGinn was asked to temporarily serve as Lucent’s CEO instead of Schact when the company struggled.
• Nortel was discontinued due to bankruptcy.
• In the year of 2007, NTT established a local subsidiary in Malaysia and Thailand.

Q2. Which of these statements is false?

• The DPC, also known as the Destination Point Code, is the number that represents a node in the SS7 network.
• There were 256 announcements at the switching system as of AIN Release 0.1.
• The ITU-T built upon the ideas of the AIN in order to develop an equivalent called the CE-1.
• Adjacent processors or APs can reduce the processing requirements of SCP’s within the SS7 network as they provide database processing services.
• ANSI is the American National Standards Institute.

Quiz 3: Lesson 3

Q1. Which components listed would you most likely find in advanced IVR systems in the modern era?

• telephony card
• webserver with parts written in HTML
• TCP/IP network
• UDP network
• XML telephony server

Q2. In addition to Alexander Graham Bell, who from the following is also credited for inventing the telephone?

• Antonio Meucci from Italy
• The great American inventor Thomas Edison
• Guglielmo Marconi, the Italian inventor
• Samuel Morse, an American Inventor

Q3. What country had the earliest example of a call center? Give the unabbreviated name of the country.

Answer: The United States had the earliest example of a call center.

Q4. Which of the following companies were providing telephone network infrastructure to telephone operators in the late twentieth century?

• Ericsson
• Western Digital
• Western Electric Company – Lucent
• Westinghouse Electric Corporation
• Nortel

Q5. RFC 791 defines one of the fundamental building blocks of the Internet called IP – the Internet Protocol. Select the only FALSE statement from the list below:

• The Source Address and the Destination address are 4 bytes each.
• IP packets contain (i) 24-byte header information and (ii) a variable number of bytes corresponding to the payload data.
• The total length of the IP packet specified by byte #3 (note that we count from 0, so this is the fourth byte) includes the length of the header plus the payload.
• The IP provides for reliable transmission of the packets from the source to the destination.
• The addresses in IPv4 (IP version 4, specified by RFC 791) are typically represented by 4 numbers in the range 0 – 255, separated by decimal (.). One example is 192.168.0.0 through 192.168.255.255, a block of addresses used on a local network.

Quiz 4: Lesson 4

Q1. What was the frequency of the early dial tone in America? Give the answer in Hz, but you do not need to explicitly write Hz or Hertz.

Answer: 600hz

Q2. Which of these statements is true?

• The outage occurred just before midnight PDT and lasted for about 7 hours.
• CenturyLink was under contract with the state of Washington in order to manage the ESINet and to prevent another outage from occurring.
• Intrado is a Colorado-based provider of 911 service.
• Verizon Business is the provider in 11 counties in Northern California for 911 service.
• Minnesota was one of the states that experienced the 911 outage in April 2014.

Q3. Who was/were involved in the request to the FCC for cybersecurity implementations within the SS7 protocol?

• Ted Lieu
• Peter Wood
• Ajit Pai
• C.E. Woolman
• Ron Wyden

Quiz 5: Lesson 5

Q1. True or false:

“The Telephony network is all analog communication and the Internet is all digital communication.”

• True
• False

Q2. What is another name for utilizing telephony to communicate 1-to-N?

Answer: Broadcasting

Q3. True or false:

“The current Telephony network is all circuit-switched communication and the Internet is all digital communication.”

• True
• False

Q4. What is the term defined by the concept of connecting any device to the internet? Give your answer in abbreviated form.

Answer: IoT (Internet of Things)

Quiz 6: Lesson 1

Q1. How is the 1 800 DENTIST number used in the 1 800 process?

• Used to identify who the caller can pay for the call.
• Used the identify a real phone number in a database to call.
• It is the direct number of the company.
• It is used to identify the caller.
• Used to identify a real address in a database to send mail.

Q2. About how many years did it take to cover the U.S. and Canada in 911 coverage?

Answer: About 40 Years

Q3. What is the minimum number of satellites to use GPS?

Answer: At least 4 satellites.

Q4. What sensor did Samsung’s phone use to allow you to write phone numbers in the air?

Answer: The accelerometer sensor.

Q5. True or false?

“The cellular telephony was all analog in 1G and became all digital 2G onwards.”

• True
• False

Quiz 6: Lesson 1

Q1. How is the bottle of whiskey made smart in our example?

• Can upload to a website about your drinking statistics.
• Can talk.
• Can move.
• Can detect what kind of whiskey is in it.
• Can detect whether it has been opened and interact with a phone.

Q2. Which of the following are devices that we mention as an example of IoT devices?

• Thermostat
• Fridge
• Television
• Toilet
• Phone

Q3. Which of the following do you need to build your own IoT?

• optimal power
• low cost
• ability to act
• compute platform
• modular to add on components

Q4. What is the name of the device we will be using? Just the first two words as one word without the model number and all lower case.

Answer: Raspberry Pi.

Q5. What cloud platform will be using in Course 3?

• Google Cloud Compute
• The Cloud
• Qualcomm Cloud
• Microsoft Azure
• Amazon Web Services

Quiz 7: Lesson 2

Q1. What is the method of using massive amounts of information to infer new information in the technology age?

• Reading
• Learning
• Spying
• Big Data
• Data collection

Q2. What is the approximate amount of time in minutes that it takes the brain to react to being full? Hint: Ganz mentions it many times

Answer: 20 Minutes

Q3. What attribute does Ganz think that Smart Home devices are trying to emphasize?

• Laziness
• Joy
• Happiness
• Anger
• Sadness

Q4. What will be center of the Smart Home?

• Door
• Phone
• Television
• Computer
• Fridge

Q5. Since the cars can not on all the time, how can power limits problem be solved as mentioned in the video?

• Always on
• Solar powered
• Never on
• Plugged in to grid
• Periodic wakes

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