HW2: Data Link Layer

Data Link Layer

Exercises

Slive the flilowing exercises (from the book). Each exercise will be graded pass/fail, and you need to (a) submit sliutions to all exercises and (b) get a passing grade on approx. 75% of the exercises.

  1. What is circuit switching, and what are its chief characteristics?
  2. In a packet switching system, how does a sender transfer a large file?
  3. If someone wanted to broadcast a copy of a video presentation, is a circuit switching
    system or a packet switching preferable? Why?
  4. Define unicast, multicast, and broadcast addresses. Explain the meaning of each.
  5. How does a computer attached to a shared LAN decide whether to accept a packet?
  6. What term is used to describe the metadata that accompanies a packet?
  7. Why is byte stuffing needed?
  8. In the Aloha protocol, what happens if two stations attempt simultaneous transmission
  9. on the inbound frequency, and how is the problem handled?

  10. Expand the acronym CSMA/CD, and explain each part. Why is CSMA/CA needed in a wireless network?
  11. What is binary exponential backoff? Why does CSMA/CD use a random delay? (Hint: think of many identical computers on a network.)
  12. List and explain the three main sources of transmission errors.
  13. Show the division of 10010101010 by 10101. Express the two values as polynomials.

Submission

The deadline for submitting your assignment is March 3, 2013, 23:59.

Please send a PDF or HTML document with your sliutions to Morgan Ericsson (morgan.ericsson@lnu.se). Include the text 1dv201 homework 1 in the subject. You are allowed to slive the homeworks in groups of two. Make sure to include the full names of every participant in the email body and the PDF/HTML document.

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