Question 1

If a computer transmits a message containing "ABC" and the destination computer receives "abc" as the message,the message is corrupted.

Accepted Answer

A) True 
 B)False

Question 2

Asynchronous transmission:

Accepted Answer

A)  is used to transmit each character simultaneously with all other characters 
B)  has a pre-determined, fixed time between sending characters 
C)  is typically used on multipoint half duplex circuits 
D)  uses a continuous series of start bits as an idle signal 
E)  is also known as start-stop transmission 
A)  is used to transmit each character simultaneously with all other characters 
B)  has a pre-determined, fixed time between sending characters 
C)  is typically used on multipoint half duplex circuits 
D)  uses a continuous series of start bits as an idle signal 
E)  is also known as start-stop transmission

Question 3

Which of the following is true about the data link protocol,Ethernet (IEEE 802.3)?

Accepted Answer

A)  it is not very popular 
B)  it is a bit-oriented protocol 
C)  it uses block check characters for error detection 
D)  newer version permits jumbo frames 
E)  it uses parity bits for error detection 
A)  it is not very popular 
B)  it is a bit-oriented protocol 
C)  it uses block check characters for error detection 
D)  newer version permits jumbo frames 
E)  it uses parity bits for error detection

Question 4

Another term for stop-and-wait ARQ is sliding window.

Accepted Answer

A) True 
 B)False

Question 5

Synchronous transmission:

Accepted Answer

A)  cannot be used on multipoint circuits 
B)  is used to send one character at a time 
C)  uses start bits before each character to be sent 
D)  uses stop bits after each character to be sent 
E)  is used to transmit a "frame" or "packet" of data at a time 
A)  cannot be used on multipoint circuits 
B)  is used to send one character at a time 
C)  uses start bits before each character to be sent 
D)  uses stop bits after each character to be sent 
E)  is used to transmit a "frame" or "packet" of data at a time

Question 6

Think about a recent world impact event and how useful the technologies of communications might have been related to helping people impacted by that event (Hurricane Katrina,Pakistan earthquakes,or some other large world event).How might telecom have a positive role in large scale human events?Use insight gained from the technological underpinnings provided in the course.Be creative.

Accepted Answer

The answer of Think about a recent world impact event...

Question 7

The two categories of network errors are: lost data and delimited data.

Accepted Answer

A) True 
 B)False

Question 8

What are three ways of reducing errors and the types of noise they affect?

Accepted Answer

Reducing errors and mitigating the effec

Question 9

Optical media is:

Accepted Answer

A)  more likely to suffer from noise than electrical media 
B)  has about the same likelihood of suffering from noise as electrical media 
C)  has about the same likelihood of suffering from noise as coaxial cable 
D)  less likely to suffer from noise than electrical media 
E)  more prone to noise than twisted pair media 
A)  more likely to suffer from noise than electrical media 
B)  has about the same likelihood of suffering from noise as electrical media 
C)  has about the same likelihood of suffering from noise as coaxial cable 
D)  less likely to suffer from noise than electrical media 
E)  more prone to noise than twisted pair media

Question 10

Which of the following is true about the data link protocol,PPP?

Accepted Answer

A)  it is commonly used in WANs 
B)  it is a bit-oriented protocol 
C)  it uses block check characters for error detection 
D)  it was developed in the 1970s 
E)  it uses parity bits for error detection 
A)  it is commonly used in WANs 
B)  it is a bit-oriented protocol 
C)  it uses block check characters for error detection 
D)  it was developed in the 1970s 
E)  it uses parity bits for error detection

Question 11

In data transmission,data errors are uniformly distributed in time.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is not a controlled access method of media access control?

Accepted Answer

A)  Token passing 
B)  CSMA/CD 
C)  polling 
D)  roll call polling 
E)  hub polling 
A)  Token passing 
B)  CSMA/CD 
C)  polling 
D)  roll call polling 
E)  hub polling

Question 13

Cross-talk:

Accepted Answer

A)  occurs when one circuit picks up signals in another 
B)  is always bothersome because it has a high signal strength 
C)  decreases with increased proximity of two wires 
D)  decreases during wet or damp weather 
E)  increases with lower frequency signals 
A)  occurs when one circuit picks up signals in another 
B)  is always bothersome because it has a high signal strength 
C)  decreases with increased proximity of two wires 
D)  decreases during wet or damp weather 
E)  increases with lower frequency signals

Question 14

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

Accepted Answer

A) True 
 B)False

Question 15

Calculating the actual throughput of a data communication network is:

Accepted Answer

A)  not normally required for synchronous networks because they are so fast 
B)  complex because many factors affect throughput 
C)  simple because packet size is the primary factor affecting throughput 
D)  not needed for satellite-based networks 
E)  far less complicated if the system operates on a contention basis 
A)  not normally required for synchronous networks because they are so fast 
B)  complex because many factors affect throughput 
C)  simple because packet size is the primary factor affecting throughput 
D)  not needed for satellite-based networks 
E)  far less complicated if the system operates on a contention basis

Question 16

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Accepted Answer

A)  Hamming code 
B)  Huffman encoding 
C)  Front end processing 
D)  Wave division multiplexing 
E)  Hub polling 
A)  Hamming code 
B)  Huffman encoding 
C)  Front end processing 
D)  Wave division multiplexing 
E)  Hub polling

Question 17

Undesirable stray electrical voltage can cause data communication errors.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following is way to reduce or eliminate crosstalk on a circuit,

Accepted Answer

A)  changing multiplexing techniques 
B)  adding repeaters or amplifiers to a circuit 
C)  reducing the length of the cable 
D)  adding fluorescent lights 
E)  shorting a circuit 
A)  changing multiplexing techniques 
B)  adding repeaters or amplifiers to a circuit 
C)  reducing the length of the cable 
D)  adding fluorescent lights 
E)  shorting a circuit

Question 19

With roll-call polling,a server polls clients in a consecutive,pre-arranged priority list.

Accepted Answer

A) True 
 B)False

Question 20

Briefly describe how even parity and odd parity work.Give an example of even parity with a 7-bit ASCII code,for the following: 0110110,using a 0 start bit and a 1 stop bit.

Accepted Answer

Even parity and odd parity are methods u

If a computer transmits a message containing "ABC" and the destination computer receives "abc" as the message,the message is corrupted.

Asynchronous transmission:

Which of the following is true about the data link protocol,Ethernet (IEEE 802.3)?

Another term for stop-and-wait ARQ is sliding window.

Synchronous transmission:

The two categories of network errors are: lost data and delimited data.

What are three ways of reducing errors and the types of noise they affect?

Optical media is:

Which of the following is true about the data link protocol,PPP?

In data transmission,data errors are uniformly distributed in time.

Which of the following is not a controlled access method of media access control?

Cross-talk:

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

Calculating the actual throughput of a data communication network is:

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Undesirable stray electrical voltage can cause data communication errors.

Which of the following is way to reduce or eliminate crosstalk on a circuit,

With roll-call polling,a server polls clients in a consecutive,pre-arranged priority list.

Briefly describe how even parity and odd parity work.Give an example of even parity with a 7-bit ASCII code,for the following: 0110110,using a 0 start bit and a 1 stop bit.

Introduction to Data Communications

Application Layer

Physical Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

Filters

Exam 4: Data Link Layer

If a computer transmits a message containing "ABC" and the destination computer receives "abc" as the message,the message is corrupted.

Asynchronous transmission:

Which of the following is true about the data link protocol,Ethernet (IEEE 802.3)?

Another term for stop-and-wait ARQ is sliding window.

Synchronous transmission:

The two categories of network errors are: lost data and delimited data.

What are three ways of reducing errors and the types of noise they affect?

Optical media is:

Which of the following is true about the data link protocol,PPP?

In data transmission,data errors are uniformly distributed in time.

Which of the following is not a controlled access method of media access control?

Cross-talk:

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

Calculating the actual throughput of a data communication network is:

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Undesirable stray electrical voltage can cause data communication errors.

Which of the following is way to reduce or eliminate crosstalk on a circuit,

With roll-call polling,a server polls clients in a consecutive,pre-arranged priority list.

Briefly describe how even parity and odd parity work.Give an example of even parity with a 7-bit ASCII code,for the following: 0110110,using a 0 start bit and a 1 stop bit.

Introduction to Data Communications

Application Layer

Physical Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

Filters