In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM
A.  spacedivision 
B.  timedivision 
C.  virtual 
D.  packet 
Option: B Explanation : Click on Discuss to view users comments. 
If a network designer wants to connect 5 routers as pointtopoint simplex line, then total number of lines required would be
A.  5 
B.  10 
C.  20 
D.  32 
Option: B Explanation : If 1st router connect with other 4 routers then total for 1st=4 same as 2nd router connect with 3 routers so total for 2nd=3 same as for 3rd router connect with 2 routers so total =2 same as 4th router with 1 so total=1 so total simplex lines will be = 4+3+2+1=10. So answer is 'B'. Click on Discuss to view users comments. Deepika said: (4:41pm on Tuesday 10th September 2013)
n(n1)/2...so 5(51)/2=20/2=10
afraz said: (10:27pm on Thursday 28th November 2013)
for simplex n(n1)for half duplex or full duplex n(n1)/2

To interface a computer terminal with a modem, required physical layer standard is
A.  RS 424  A 
B.  RS 232  C 
C.  RS 449 
D.  Either (b) or (c) 
Option: D Explanation : Click on Discuss to view users comments. 
A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable ?
A.  572 
B.  672 
C.  772 
D.  873 
Option: C Explanation : Propagation speed in the cable = 200,000 km/sec = 200 km/psec. Hence 100 km cable will be filled in 500 psec. This corresponds to four 193bit frames, or 772 bits on the cable. Click on Discuss to view users comments. 