ARP and DNS both depend on caches; ARP cache entry lifetimes are typically 10 minutes, while DNS cache lifetimes are on the order of days. Justify this difference. What undesirable consequences might there be in having too long a DNS cache entry lifetime?

When a Page Fault is encountered during a Virtual Address translation to Physical Address, either only hardware or only software can be used to handle the page fault. O True O False

Consider a system with 36-bit virtual addresses, 32-bit physical addresses, and 4KB pages. The Translation Look aside Buffer (TLB) system uses a page table to translate virtual addresses to physical addresses; each page table entry include dirty (D) and resident (R) bits. 8. Virtual Page Number (VPN) Valid Bit (V) Dirty Bit (D) PPN(Physical Page Number) Tag 00000A. in HEX 0000A a) Assuming a flat page table, what is the size of each page table entry, and how many entries does the page table have? b) If you changed the system to use 1KB pages instead of 4 KB pages, how would the number of entries in the page table change? Please give the ratio of the new size to the old size. c) For page size of 4KB, the contents of the page table and TLB are shown to the right. The page table uses an LRU replacement policy, and the LRU page (shown below) will be chosen for replacement. For each of these four accesses, compute its corresponding physical address and indicate whether the access causes a…

Suppose the virtual address width is 32 bits. Also suppose that the virtual and physical page size is 4Kbytes. If the physical address limit is 220, what is the number of bits in the Physical frame part of the physical address?