June 2008 and December 2007
26. The ATM cells ------ byte long
(a) 48 (b) 53 (c) 64 (d) 69
27. For slotted ALOHA maximum channel utilization is
(a) 100% (b) 50% (c) 36% (d)18%
28. For channel of 3 kHz bandwidth ands signal to noise
ratio of 30db the maximum data rate is
(a) 3000bps (b) 6000bps (c) 15000bps (d) 30000bps
29. An example of public key encryption algorithm is
(a) Ceaser
cipher algorithm (b) DES algorithm (c) AES algorithm (d) knapsak algorithm
30. With reference to hierarchical routing the optimum
number of levels for an m router subnet is
(a) m^2 (b) m (c)
ln m (d) square root of m