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Midterm Exam #2 Review

Midterm Exam #2 Review. Exam time is July 5th during class time. The second homework and lecture content after first mid-exam until this class will be covered. You need to compute out the final numerical results in your answer. Do not simply write down the formula as your answer.

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Midterm Exam #2 Review

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  1. Midterm Exam #2 Review • Exam time is July 5th during class time. • The second homework and lecture content after first mid-exam until this class will be covered. • You need to compute out the final numerical results in your answer. Do not simply write down the formula as your answer. • You can bring a calculator (no computer, iPhone, etc)

  2. Question Types • Knowledge questions • True or false statement (explain why) • Protocol • Calculations

  3. Knowledge Question Examples • Compare pros and cons for go-back-N and selective repeat ARQ? • Go-back-N: pro: single timer, simple con: not efficient, waste bandwidth when a packet is lost/broken • Selective repeat: pro: efficient, only lost/broken packets need retransmission con: complicated with multiple timers • Difference between “Ethernet hub” and “Ethernet switch”? • IPv6 uses how many bits for addresses?

  4. Knowledge Question Examples • Difference between Ethernet switch and router? • What is VLAN? Its advantages? • Interpret IP address block “a.b.c.d/n”? How many IPs in it? First address? Last address? • What is NAT? Its pros and cons? • How many bytes are used for MAC address? IP address? IPv6 address? • What are the three blocks of private IP subnets? • What is the minimum Hamming distance?

  5. Protocol Example • Stop-and-wait ARQ for noisy channel (hw2, Q9) • CRC circuit design (homework 2) • Bit stuffing and byte stuffing (ch11, homework 2)

  6. Calculation Problem Examples • Hamming Distance (ch10, Page 17-20) • Checksum (ch10, homework 2) • Go-back-N utilization compute (ch11.ppt, Page 34-37) • IP block subnet allocation (ch19.ppt, Page 34-40) • NAT table and address translation (ch19.ppt, Page 44) • All questions in homework 2 will be covered

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