Question 1

Describe how MAC address filtering works.

Accepted Answer

The answer of Describe how MAC address filtering works....

Question 2

Errors normally appear in ______________________________, which is when more than one data bit is changed by the error-causing condition.Is there any difference in the error rates of lower speed lines and of higher speed lines? What kinds of lines are more prone to errors?

Accepted Answer

The answer of Errors normally appear in ______________________________, which is...

Question 3

What does the data link layer do? What are its primary responsibilities? Where does the data link layer sit in terms of the simplified five layer network model?

Accepted Answer

The answer of What does the data link layer do?...

Question 4

Compare and contrast roll call polling, hub polling or token passing), and contention.Which is better, hub polling or contention? Explain.

Accepted Answer

The answer of Compare and contrast roll call polling, hub...

Question 5

Describe continuous ARQ.

Accepted Answer

The answer of Describe continuous ARQ....

Question 6

What is transparency?

Accepted Answer

The answer of What is transparency?...

Question 7

The data link layer uses the ________ to recognize the source and destination addresses.

Accepted Answer

The MAC address is used by the data link layer to recognize the source and destination addresses. The IP address is used by the network layer, the URL is used by the application layer, and the email address is used by the transport layer. The local router is not used for address recognition at the data link layer.

Question 8

Briefly define noise.Describe five types of noise and the underlying causes of this noise.Which type of noise is likely to pose the greatest problem to network managers? What does error look like in a data network?

Accepted Answer

The answer of Briefly define noise.Describe five types of noise...

Question 9

What is transmission efficiency? How do information bits differ from overhead bits? What are three issues which might effect packet throughput rates? Which is better for file transfer, large packet sizes or small packet sizes?

Accepted Answer

The answer of What is transmission efficiency? How do information...

Question 10

How do amplifiers differ from repeaters?

Accepted Answer

The answer of How do amplifiers differ from repeaters?...

Question 11

What is asynchronous transmission v.synchronous transmission? Describe one protocol of each type.

Accepted Answer

The answer of What is asynchronous transmission v.synchronous transmission? Describe...

Question 12

How does cyclical redundancy checking work?

Accepted Answer

The answer of How does cyclical redundancy checking work?...

Question 13

What is media access control and why is it important? What are two examples of controlled access methods and contention based media access methods? When might one access method be preferred over another in a network, and why? Under what conditions do contention-based media access control techniques outperform controlled-access techniques i.e., have lower response time)? Explain.

Accepted Answer

The answer of What is media access control and why...

Question 14

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 15

How does forward error correction work? How is it different from other error correction methods? Under what circumstances is forward error correction desirable? What is one type of forward error correction by name? Given a diagram like that in the text of forward error correction, be able to explain how the system works.

Accepted Answer

The answer of How does forward error correction work? How...

Question 16

Describe from a high level perspective the packet layout for SDLC, Ethernet, and PPP.

Accepted Answer

The answer of Describe from a high level perspective the...

Question 17

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

Accepted Answer

The answer of What are three ways of reducing errors...

Question 18

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

The answer of Briefly describe how even parity and odd...

Question 19

__________ is a software-enabled technique that can change the hardcoded MAC address to any MAC address and thus overcome MAC address filtering.

Accepted Answer

MAC address spoofing is the technique used to change the hardcoded MAC address to any desired MAC address, which can be used to bypass MAC address filtering on a network. This technique can be performed using various software tools and is commonly used in malicious activities such as identity theft, network attacks, and unauthorized access.

Question 20

Describe three approaches to detecting errors, including how they work, the probability of detecting an error, and any other benefits or limitations.

Accepted Answer

The answer of Describe three approaches to detecting errors, including...

Quiz 4: Data Link Layer