Assignment 8
Introduction
Please answer the questions precisely and concisely. Every question can be answered in one or at most a few sentences. I will not have the patience to read long paragraphs or essays and you may lose credit for possibly correct answers.
Submit your work via sakai as a plain text or pdf document. No Microsoft Word, Apple Pages, ePub, et cetera formats.
Reading
Section 4.7 (Broadcast and Multicast Routing)
pages 399–412.
Section 5 (Link Layer)
pages 433 - top of 476.
Questions
(1) What is an advantage of multicast routing using a group-shared tree (this is called PIM Sparse Mode) over multicast routing using a source-based tree (this is also known as PIM Dense Mode)?
(2) Page 502 - R6. In CSMA/CD, after the fifth collision, what is the probability that a node chooses K = 4? The result K = 4 corresponds to a delay of how many seconds on a 10 Mbps Ethernet?
(3) Page 503 - P6b. Consider the 5-bit generator, G=10011, and suppose that D has the value 0101101010. What is the value of R? You might find this brief article on CRC helpful.
(4) What is ARP Spoofing? (You’ll have to look on the web to find the answer)
