QoS question need answers

图书介绍

First Question

http://i34.tinypic.com/53lrmt.jpg

Which DSCP value will the TestKing5 branch router apply to voice traffic destined
for the IP Phone on the local network from the TestKing2 router at the main site?
A. 56 (cs7)
B. 70
C. 46 (ef)
D. 50
E. 48 (cs6)
F. None of the above
Answer: C ==============================why???and how??????


Which DSCP value will the TestKing5 ranch router apply to voice traffic destined
for the Main office from the IP Phone on the local network?
A. 48 (vs6)
B. 50
C. 56(cs7)
D. 70
E. 46 (ef)
F. 48 (cs6)
G. None of the abov

answer f ==============================why???and how??????

Which QoS model has been implemented on the Branch router by the SDM wizard
for the various expected traffic types?
A. IntServ
B. Priority Queuing
C. Best Effort
D. DiffServ
E. None of the above



answer D


HOW can u know these answer from the figure??????????????