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What is the best explanation for why digital data is represented in computers in binary?
-ANSWER It's easier, cheaper, and more reliable to build machines and devices that only
have to distinguish between binary states.
What is the 4-bit binary number for the decimal number Ten (10)? -ANSWER 1010
What is the minimum number of bits you would need to encode the 26 letters of the
alphabet plus a space - a total of 27 characters? -ANSWER 5 bits
Number systems with different bases such as binary (base-2), octal (base-8), decimal
(base-10), and hexadecimal (base-16), are all used to view and represent digital data.
Which of the following is NOT true about representing digital data? -ANSWER When data
is large enough computers switch to using decimal representation instead of binary,
because you can represent larger numbers with fewer digits.
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? -ANSWER 01010
1110
010000
A middle school is expanding to open a high school next year, doubling the total number
of students. The school keeps a database in which each student's unique ID number is
stored as an 8 bit number called studentID. Before the arrival of the new students
almost every 8 bit number has already been assigned to a student. Of the options
provided below, which is the smallest change to the way studentID is represented
necessary to ensure each incoming student receives a unique ID? -ANSWER Add a bit to
studentID to double the number of IDs that the database can represent.
A user clicks on a website, and it begins to load immediately, but it takes a long time to
load completely and pictures appear slowly, one by one. Which of the following is
demonstrated through this situation? -ANSWER Low bandwidth, low latency
, 8 bits is enough to represent 256 different numbers. How many total bits do you need to
represent 512 (twice as many) numbers? -ANSWER 9 bits
ASCII is a character-encoding scheme that uses a numeric value to represent each
character. For example, the uppercase letter "G" is represented by the decimal (base
10) value 71. A partial list of characters and their corresponding ASCII values are
shown in the table below. (See Code.Org Unit 1 Ch 1 Assessment Question 9)
ASCII characters can also be represented by binary numbers. According to ASCII
character encoding, which of the following letters is represented by the 8-bit binary
value: 0100 0010 -ANSWER ASCII Character: B
Two students have developed a protocol in which they send 4-bit messages to each
other. They decide to modify their protocol to start sending 8-bit messages instead. How
many more values can be represented in an 8-bit message than a 4-bit message? -
ANSWER 2⁴ = 16 times as many values
Which of the following statements are true about routers and routing on the Internet.
Choose two ANSWERs. -ANSWER A packet traveling between two computers on the
Internet may be rerouted many times along the way or even lost or "dropped".
Routers act independently and route packets as they see fit.
The various protocols in use on the internet are said to operate in layers in which the
protocol(s) at each layer solve one problem related to networked communication, and
higher layers are built on top of, and rely on, the lower layers to do their jobs.
From the list provided choose the two (2) ANSWERs that correctly describe which
internet protocol relies on the other. For example: if protocol A relies on protocol B, it
means that A is a higher level protocol than B, and thus protocol B must exist and work
properly in order for protocol A to do its job.
Select two ANSWERs. -ANSWER HTTP relies on TCP/IP
DNS relies on TCP/IP
A school starts tracking which websites each computer in the school is visiting by
monitoring the packets leaving the school. A sample of the information they have
collected appears below:
IP Address Time URL
... ... ...
1.1.1.1 11:05:23.22 example.com
1.5.1.8 11:05:29.71 news.com
1.1.5.1 11:06:13.48 sports.com
1.5.1.8 11:08:09.95 example.com
2026-2027 || 100% Guaranteed Pass
What is the best explanation for why digital data is represented in computers in binary?
-ANSWER It's easier, cheaper, and more reliable to build machines and devices that only
have to distinguish between binary states.
What is the 4-bit binary number for the decimal number Ten (10)? -ANSWER 1010
What is the minimum number of bits you would need to encode the 26 letters of the
alphabet plus a space - a total of 27 characters? -ANSWER 5 bits
Number systems with different bases such as binary (base-2), octal (base-8), decimal
(base-10), and hexadecimal (base-16), are all used to view and represent digital data.
Which of the following is NOT true about representing digital data? -ANSWER When data
is large enough computers switch to using decimal representation instead of binary,
because you can represent larger numbers with fewer digits.
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? -ANSWER 01010
1110
010000
A middle school is expanding to open a high school next year, doubling the total number
of students. The school keeps a database in which each student's unique ID number is
stored as an 8 bit number called studentID. Before the arrival of the new students
almost every 8 bit number has already been assigned to a student. Of the options
provided below, which is the smallest change to the way studentID is represented
necessary to ensure each incoming student receives a unique ID? -ANSWER Add a bit to
studentID to double the number of IDs that the database can represent.
A user clicks on a website, and it begins to load immediately, but it takes a long time to
load completely and pictures appear slowly, one by one. Which of the following is
demonstrated through this situation? -ANSWER Low bandwidth, low latency
, 8 bits is enough to represent 256 different numbers. How many total bits do you need to
represent 512 (twice as many) numbers? -ANSWER 9 bits
ASCII is a character-encoding scheme that uses a numeric value to represent each
character. For example, the uppercase letter "G" is represented by the decimal (base
10) value 71. A partial list of characters and their corresponding ASCII values are
shown in the table below. (See Code.Org Unit 1 Ch 1 Assessment Question 9)
ASCII characters can also be represented by binary numbers. According to ASCII
character encoding, which of the following letters is represented by the 8-bit binary
value: 0100 0010 -ANSWER ASCII Character: B
Two students have developed a protocol in which they send 4-bit messages to each
other. They decide to modify their protocol to start sending 8-bit messages instead. How
many more values can be represented in an 8-bit message than a 4-bit message? -
ANSWER 2⁴ = 16 times as many values
Which of the following statements are true about routers and routing on the Internet.
Choose two ANSWERs. -ANSWER A packet traveling between two computers on the
Internet may be rerouted many times along the way or even lost or "dropped".
Routers act independently and route packets as they see fit.
The various protocols in use on the internet are said to operate in layers in which the
protocol(s) at each layer solve one problem related to networked communication, and
higher layers are built on top of, and rely on, the lower layers to do their jobs.
From the list provided choose the two (2) ANSWERs that correctly describe which
internet protocol relies on the other. For example: if protocol A relies on protocol B, it
means that A is a higher level protocol than B, and thus protocol B must exist and work
properly in order for protocol A to do its job.
Select two ANSWERs. -ANSWER HTTP relies on TCP/IP
DNS relies on TCP/IP
A school starts tracking which websites each computer in the school is visiting by
monitoring the packets leaving the school. A sample of the information they have
collected appears below:
IP Address Time URL
... ... ...
1.1.1.1 11:05:23.22 example.com
1.5.1.8 11:05:29.71 news.com
1.1.5.1 11:06:13.48 sports.com
1.5.1.8 11:08:09.95 example.com
