# Quiz 5 Solutions

Mon Nov 30

You have up to 20 minutes. You may use a standard calculator if necessary, but no text book, notes, or computer.

1. Briefly describe the main purpose of the Domain Name Service (DNS).

DNS translates a domain name to an IP address. The domain name is the text identifier, such as google.com or liu.edu. An IP address is a numeric identifier used for routing data on the Internet. An IPv4 address looks like 148.4.29.14

2. Suppose the operator of a batch computing system needs to run the following jobs, one at a time. Use timelines to illustrate two strategies, and calculate the average turn-around time with each strategy. Which strategy is better?

    J1 takes 5 minutes
J2 takes 3 minutes
J3 takes 4 minutes
J4 takes 2 minutes

(TODO)