A.fter the first collision, each station waits either 0 or l (72) times before trying again. If two stations collide and each one picks the same random number, they will collide again. After the second collision, each one picks either 0,1,2,or 3 at random and waits that number of slot times. If a third collision occurs (the probability of this happening is 0.25), then the next time the number of slots to wait is chosen at (73) from the interval 0 to 23-1.
In general, after i collisions,a random number between 0 and 2i-1 is chosen, and that number of slots is skipped. However, after ten collisions have been reached, the randomization (74) is frozen at a maximum of 1023 slots. After 16 collisions, the controller throws in the towel and reports failure back to the computer. Further recoveryis up to (75 )layers.(71)
A.datagram
B.collision
c.connection
D. service(72)
A.slot
B.switch
C.process
D.fire(73)
A.rest
B.random
C.once
D.odds(74)
A.unicast
B.multicast
C.broadcast
D.interval(75)
A.local
B.next
C.higher
D.lower
[填空题] “And now let us begin with lot 1”所表示的中文意思是()。
[试题](49) In fact, it is difficult to see how journalists who do not have a clear preps of the basic features of the Canadian Constitution can do a competent job on political stories.
[试题](49)In fact, it is difficult to see how journalists who do not have a clear preps of the basic features of the Canadian Constitution can do a competent job on political stories.此处译文为:
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