$[$Multiple Correct$[$Multiple correct$]$ Which of the following statements about network design is correct?

A$.$ It's needed to do performance evaluation to design a reasonable network

B$.$ For access layer, we can design a switch cascading network or a switch ring network

C$.$ A $3-$layer network is combined of core layer, convergence layer and access layer while a $2-$layer network doesn't have convergence layer

D$.$ Dual$-$core networking helps the network to be more reliable