Which of the Following Rules Should a Network Administrator Obey

Multiple Choice

Which of the following rules should a network administrator obey when the network administrator uses the VLSM technology to plan subnets? (Choose three.)

A) A subnet is composed of all summarized routes.
B) A subnet can address a host or be further subnetted.
C) The Update message of a routing protocol in use must carry subnet mask information.
D) The summarized networks must have the same high-order bit.