21.  In a banyan switch, for 8 inputs and 8 outputs, we have _____ microswitches at each stage. 
Answer: (b).4

22.  A ________ switch combines spacedivision and timedivision technologies to take advantage of the best of both. 
Answer: (a).TST

23.  The most popular technology in timedivision switching is called the _________. 
Answer: (c).TSI

24.  Based on the Clos criteria, if N = 200, then n must be equal to or greater than ____. 
Answer: (a).10

25.  Based on the Clos criteria, if N = 200, then k must be equal to or greater than ____. 
Answer: (b).19

26.  Based on the Clos criteria, if N = 200, then the minimum number of crosspoints is greater than or equal to _______. 
Answer: (a).15,200

27.  In a onestage space division switch, if N = 200, the number of crosspoints is ______. 
Answer: (c).40,000

28.  In a threestage space division switch, if N = 200, the number of crosspoints is ______. 
Answer: (c).less than 40,000

29.  A ________ switch combines crossbar switches in several (normally three) stages. 
Answer: (a).multistage

30.  In _______ switching, the paths in the circuit are separated from one another spatially. 
Answer: (b).spacedivision
