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CS457 midterm review
Fall Semester, 2014 Dr. Joseph Gersch
My inspira*on
Mid-‐Term Exam • Thursday, October 16, in class 2-‐3:15 • Remote students use a proctoring center • You may bring one 8-‐1/2 x 11 sheet of paper with any
notes you would like • You may bring a simple calculator, but no cellphones
• This exam is to assess your understanding of the material covered. There will be concepts, terminology and problems to be solved.
• The remaining slides give a MIND MAP outline of topics discussed in the first half of the semester.
Exam Format • About five major parts, several sub-parts, questions of
various difficulty • Very few, if any, numerical questions. Most questions will
be based on your understanding • Broad set of topics, but emphasis on thinking, not
memorizing. • Some multiple choice, fill-in the blanks and matching
questions. • Exam is longish, so manage your time VERY carefully! Do
easy questions first, come back for the rest. • Most answers are short, one or two sentences, often one or
two words. • Leave time at the end to review your answers.
How to Do Well in this Exam • Study ALL the material, but make sure you understand the
fundamentals. • Study homework questions, be ready for déjà-vu • Consider variations on the scenarios we discussed in class – “what if I change this..”
• Be VERY concise and thoughtful in your answers! I try hard to give partial credit, but you may lose it if you write something completely off the mark.
• Write short answers – long answers are most likely wrong. • Write clearly!! Use a pencil.
Sample Questions • Explain why we cannot use an LS or DV protocol for inter-
domain routing. • Contrast the operation of DV and LS protocols. Which one
converges faster? • Which transport protocol, TCP or UDP, is better suited for these
applications? File transfer, voice, video-on-demand, interactive video, email. Explain why.
• Given the contents of a FIB, match a packet with the appropriate entry.
• Given a prefix and subnet requirements, divide the prefix into appropriate subnets.
• Give two pros and two cons for NAT.
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