a. Suppose computers A, B, C, and D are connected to an ethernet cable, similar to the setup shown in lecture. Computer A begins transmitting a packet on the cable, but it collides with another transmission, so A stops transmitting. What does computer A do next?
b. Suppose we are using the following checksum scheme: add up all the bytes, and take just the last two digits of the sum. What is the checksum of the following bytes: 101, 202, 103, 100, 210, 120
c. What problem is addressed by checksums? (one sentence answer)
d. A computer connected to the internet is identified by what kind of address (the specific name, not just "internet address"):
e. Circle any of the addresses below which are not valid internet addresses:
1.2.3.4, 11.250.3.4, 45.67.212.100, 42.257.99.11, 171.64.64.171