The following questions are all short answer (at most a few sentences).

1. Why does UNIX distinguish between standard output and standard error, given that both default to the terminal?

2. Consider a memory system in which memory consists of the following hole sizes in memory order: 10K, 4K, 20K, 18K, 7K, 9K, 12K, and 15K. Which hole is taken for successive segment requests of

a. 12K

b. 10K

c. 9K

For first fit, best fit, and next fit.

3. Consider an OS that uses the buddy system for memory management. Initially it has one block of 256K at address 0. After successive requests for 6K, 19K, 53K, and 25K are processed, how many blocks are left and what are their sizes and addresses?