What is a collaboration-oriented technology on the web that allows anyone to update posted information?
a. facebook
b. twitter
c. wiki
d. youtube

Some of the items below indicate the steps required to move a slide to a different location in a presentation. select those steps and indicate the order in which they should be performed to move the slide. (for example, if an item describes what you do first, select 1.) included in the list are items that are not part of the process. for these items, select n/a, an abbreviation for not applicable. 1 — first 2 — second 3 — third 4 — fourth 5 — fifth 6 — sixth n/a — not applicable drag the slide to the desired place. enter the slide position desired. hold the mouse button down. select move from the tools menu. select the slide. switch to the notes view.

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a, b,c, d sharing the medium. (a) stations a, b,c, d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful. when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?

10. when you create a pivottable, you need to specify where to find the data for the pivottable. is it true