This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. Consider two hosts, A and B, connected by a single link. A is to send a packet to B. Assume dtrans and dprop represent transmission and propagation delay.

a. Suppose Host A begins to transmit the packet at time t = 0. At time t = dtrans, where is the last bit of the packet and why?

b. Suppose dprop > dtrans. At time t = dtrans, where is the first bit of the packet and why? c. Suppose dprop < dtrans. At time t = dtrans, where is the first bit of the packet and why?

Which type of tab stop is most for weights and measurements?

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)?

Janice usually works on a particular workbook that contains all business related data. she decides to keep a backup of all the data in a separate workbook. she opens a new workbook to transfer the data. which option should she use to copy all the data from one workbook to another workbook?