Which of the following is true regarding the use of switches and hubs for network connectivity?（）

A.A successor route is used by EIGRP to forward traffic to a destination.
B.Successor routes are saved in the topology table to be used if the primary route fails.
C.Successor routes are flagged as "active" in the routing table.
D.A successor route may be backed up by a feasible successor route.
E.Successor routes are stored in the neighbor table following the discovery process.

A.Switch1（config-if）# switchport port-security maximum 1
B.Switch1（config）# mac-address-table secure
C.Switch1（config）# access-list 10 permit ip host
D.Switch1（config-if）# switchport port-security violation shutdown
E.Switch1（config-if）# ip access-group 10

A.It divides the network communication process into smaller and simpler components， thus aiding component development， design， and troubleshooting.
B.It enables equipment from different vendors to use the same electronic components， thus saving research and development funds.
C.It supports the evolution of multiple competing standards， and thus provides business opportunities for equipment manufacturers.
D.It encourages industry standardization by defining what functions occur at each layer of the model.
E.It provides a means by which changes in functionality in one layer require changes in other layers.