Midterm Exam 2 Review Exam time is July

Midterm Exam #2 Review • Exam time is July 5 th 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, i. Phone, etc)

Question Types – Knowledge questions – True or false statement (explain why) – Protocol – Calculations

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, receiver needs a buffer to buffer out-of -order packets • Difference between “Ethernet hub” and “Ethernet switch”? • IPv 6 uses how many bits for addresses?

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? IPv 6 address? • What are three blocks of private IP subnets? • What is the minimum Hamming distance?

Protocol Example • Stop-and-wait ARQ for noisy channel (hw 2, Q 9) • CRC circuit design (homework 2) • Bit stuffing and byte stuffing (ch 11, homework 2)

Calculation Problem Examples • • • Hamming Distance (ch 10, Page 17 -20) Checksum (ch 10, homework 2) Go-back-N utilization compute (ch 11. ppt, Page 34 -37) IP block subnet allocation (ch 19. ppt, Page 34 -40) NAT table and address translation (ch 19. ppt, Page 44) • All questions in homework 2 will be covered

Midterm 2 Grade Statistics