Suppose a broadcasts an arp query "who-has b? ", receives b’s response, and proceeds to send b a regular ipv4 packet. if b now wishes to reply, why is it likely that a will already be present in b’s arp cache? identify a circumstance under which this can fail.

Plz 40 points what are raster vectors? a bitmap image a vector file a type of printing press a small projector

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

Jackson, who works in the finance department of a company, is holding a seminar for other employees on how to file taxes. only three employees sign up to attend the seminar. which device can he use to share his presentation with a group of three employees?