AP CSP fall final multiple choice

Pick Two: Pick the two statements about packets and routing on the Internet which are true. -Packets travelling across the Internet take a standardized amount of time and so can be counted on to arrive in the order they were sent -TCP ensures messages can be reliably transmitted across the Internet -TCP depends on the infrastructure of the Internet to be reliable enough to ensure no packets are lost in transmission -TCP must account for the fact that packets may not arrive at a destination computer in the intended order

- TCP ensures messages can be reliably transmitted across the Internet -TCP must account for the fact that packets may not arrive at a destination computer in the intended order

Which two of the following statements are true about routing on the Internet. -Information travelling between two computers over the Internet will always take the same path. -Your router receives all the traffic of the Internet and delivers to your computer only the messages intended for you. -There is one router which receives and redirects all the traffic of the Internet. -A packet travelling between two computers on the Internet may be rerouted many times along the way. - A packet contains addressing information to allow routers to decide how best to forward along that packet towards its destination.

-A packet travelling between two computers on the Internet may be rerouted many times along the way. - A packet contains addressing information to allow routers to decide how best to forward along that packet towards its destination.

If the post office delivered mail exactly like routers deliver messages on the internet, which 2 of the following statements would be true? -One mailman would be responsible for delivering a letter from sender to receiver. -The mailman would sometimes take a different path to deliver each letter to your home. -Letters would be written on the outside of envelopes for all to read instead of letters put inside envelopes. -Your mail could not be delivered if a road your mailman was planning to take were under construction.

-The mailman would sometimes take a different path to deliver each letter to your home. -Letters would be written on the outside of envelopes for all to read instead of letters put inside envelopes.

Choose the two best answers to complete the sentence: If I understand how the internet works then I will be able to: -make informed choices to support or oppose decisions my government makes about access to the internet. -connect the latest devices to the internet. -get the best price for my cell phone plan. -speed up my downloads of movies I purchase. -make informed choices about my privacy on the internet.

-make informed choices to support or oppose decisions my government makes about access to the internet. -make informed choices about my privacy on the internet

You have a coordinate grid that is 96 x 96. Assuming that you encode the x and y coordinate as separate numbers, what is the minimum number of bits that you will need to encode a coordinate in that space? -16 -14 -13 -10

14

When responding to a question with 4 choices, the most efficient method will require _____ number of bits. -5 bits -4 bits -3 bits -2 bits -1 bit

2 bits

How many bits? ASCII has an encoding for every character of the alphabet as well as encodings for numbers -- that is, encodings for the symbols of the digits 0-9. So here is a trick question: How many bits are required to store the text of the number "150" in ASCII?' -3 bits -8 bits -16 bits -24 bits -32 bits

24 bits

What is the minimum number of bits you need to encode the 26 letters of the alphabet plus a space? -2 bits -3 bits -4 bits -5 bits -6 bits

5 bits

How many unique IP addresses could be made in a fixed-length IP address system using 6 bits? - 6 users -12 users -32 users -64 users

64 users

The standard QWERTY keyboard has 47 keys that can place characters on the screen. Each of these keys can also display a second character by holding the "Shift" key at the same time. How many bits would you need to encode everything that could be typed on this keyboard? -3 bits -4 bits -5 bits -6 bits -7 bits -12 bits

7 bits

If you just had two shapes (say, a circle and a square), how many 3-place patterns could you make? -4 -6 -8 -10 -12

8

The Internet Engineering Task Force (IETF) defines the protocols and standards for how the Internet works. The members of the IETF are: - An International coalition of government agencies who oversee the Internet in their countries. - The worldwide leaders of the Tier 1 Internet service providers. - A loosely organized collection of citizens and engineers who communicate mostly by email. - Political leaders and heads of state. -There are no members. IETF is an "organization" in name only.

A loosely organized collection of citizens and engineers who communicate mostly by email.

Which of the following is NOT true about packets? -Packets are numbered so if they arrive out of order the message can be reassembled. - A message sent across the Internet can always be contained in a single packet -Packets are routed on different paths from sender to receiver. -The receiver computer must confirm to the sending computer that each packet was received.

A message sent across the Internet can always be contained in a single packet

A binary question is defined as: -A question which can be answered in only one of two possible ways -A piece of information that is sent in pairs -Two questions which share the same answer -A message which has two possible states

A question which can be answered in only one of two possible ways

A binary message consisting of four bits was sent to you by a friend. The message was supposed to be ABAB. Unfortunately, your friend set the bit on the wire once every 2 seconds, but you read the wire once every second. Assuming that the first bit was sent and read at the same time, what message did you receive instead? - ABAB -AABB -AAAA -BBBB -ABBB

AABB

What feature of DNS and IP allow the internet to scale? - A. Redundancy -B. Hierarchy -C. Multiple servers - D. Government control

B. Hierarchy

A single central register of IP addresses and names (a DNS style system) is an efficient means of translating human readable names to IP addresses. Which of the following is NOT solved by DNS? - A. It is inefficient to have everyone on the Internet maintain their own list of IP addresses. - B. There are too few IP addresses to meet the current demand. -C. When someone new joins the Internet they must inform everyone else of the new IP address -D. When an IP address changes, it is impossible to locate a computer until the owner announces the change.

B. There are too few IP addresses to meet the current demand.

What is an RFC? - Restricted Fiduciary Contract - Request For Comments -Radio Frequency Controller -Related Fundamental Content - ReFactored Code

Request For Comments

In the Internet Simulator, your router knows to send your message to a different router because: -You set the "other router" bit in the message. -Everyone is on the same router. -The first 4 bits of the address specify the router number that your friend is on. -Messages are routed over different paths.

The first 4 bits of the address specify the router number that your friend is on.

Which of the following information is not necessary in your protocol to play battleship? -Grid Coordinates -From -To -Time of Day

Time of Day

To improve communication in playing battleship on the Internet Simulator your group invented a(n): -heuristic -algorithm -protocol -encoding

protocol