When the parameters defining the queuing system vary over time, ...

[Mimi]

When the parameters defining the queuing system vary over time, the system is
  a.open.
  b.blocked.
  c.FCFS.
  d.nonstationary.

Question 2

In a closed queuing network
  a.there are no steady state probabilities.
  b.there is a unique solution for P_ij, the probability that a job will travel from server i to server j.
  c.there is a variable number of jobs in the network.
  d.the distribution of jobs at different servers are not independent.

[jackie]

Answer to Question 1

correct: d

Answer to Question 2

correct: d

[Mimi]

Thank you!

[jackie]

Always glad to help...