Computer Science questions

Question: Echo is not a useful error detection technique in computer networking because:

Answer Choices:
Errors may cancel out during the echo
It is complex to use
It is difficult to implement
It is time consuming

Answer: Errors may cancel out during the echo

Question: The important functions of the Transport layer include all of the following except:

Answer Choices:
Routing
Port addressing
Segmentation
Duplicate detection

Answer: Routing

Question: The time to live field of an IP packet indicates:

Answer Choices:
The remaining life of the packet in network hops.
The announced life of the packet by the source.
The number of routers encountered by the packet during its journey.
The remaining life of the packet in seconds.

Answer: The remaining life of the packet in network hops.

Question: In a flowchart, the diamond symbol indicates some condition that must be tested.

Answer Choices:
True
False

Answer: True

Question: In code we write a dual-alternative decision structure as an if-else statement.

Answer Choices:
True
False

Answer: True

Question: Decision structures are also known as selection structures.

Answer Choices:
True
False

Answer: True

Question: If you are writing an if statement that has only one conditionally executed statement, you must enclose the conditionally executed statement in curly braces.

Answer Choices:
True
False

Answer: False

Question: Variables of the int data type are commonly used as flags.

Answer Choices:
True
False

Answer: True

Question: The ability of TCP to serve multiple applications simultaneously is called:

Answer Choices:
Multiplexing
Reliability
Connection establishment
Flow control
Segmentation

Answer: Multiplexing

Question: Boolean expressions are named in honor of the English mathematician George Boole.

Answer Choices:
True
False

Answer: True

Question: A(n) ________ statement has two parts: an if clause and an else clause.

Answer Choices:
if-else
else-if
logic
branching

Answer: if-else

Question: Most modern corporate Ethernets use switches instead of hubs.

Answer Choices:
False
True

Answer: True

Question: The binary number 11000011 represents the decimal number:

Answer Choices:
189
187
197
199

Answer: 195

Question: A switch statement’s test expression can be of any data type.

Answer Choices:
True
False

Answer: False

Question: In C#, you use the if statement to write a single-alternative decision structure.

Answer Choices:
True
False

Answer: True