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31:
You are designing a WAN connect 3 networks locate in chicago, Atlanta and£ los Angeles
desired result:
all of computer on each of 3 network must be able to communication wITh any other computer on the 3 networks
the WAN link must be capable of£ transmising data at a minimum speed of 1 Mbps
optional results:
.you want to provide continous communication when 1 link failure
.you want to provide continuous communication when 1 link failure at minimum 1Mbps
proposed solution:

connect 3 networks using 2 primary£ T1 and 2 secondary asyncHRonous 9600 bps link as shown below

figure 1

A: match results and£ match all optional
b: match results and one of optional
c: match results£ and none of optional
d: not match results
ans:b