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Question 3:

Which of the following are benefits of using a layered network model?
. it specifies how changes to one layer must be propagated through the other layers
B . it facilitates troubleshooting
C . it focuses on details rather than general functions of networking
D . it breaks the complex process of networking into more manageable chunks 
E . it allows layers developed by different vendors to interoperate.

A and B only
B, D, and E
A and C only
none of the above
all of the above