Answer from cs61c-ei (Jing Chen 16669246) for Question 1
The TLB is a cache that holds a subset of virtual-to-physical page mappings of the page table. Essentially, it holds the most recently used pages. Caches are temporary storages for data that has been accessed most recently. 

TLB miss rates are typically lower than LI cache miss rates because the TLB deals specifically with pages, chunks of memory, whereas caches deal with blocks of data (words/bytes). Therefore, it is much more likely to get a cache data miss than a page miss/fault.