Refer to the exhibit.

The enterprise has decided to use the network address 172.16.0.0. The network administrator needs to design a classful addressing scheme to accommodate the three subnets, with 30, 40, and 50 hosts, as shown. What subnet mask would accommodate this network?

Refer to the topology below.

What interfaces on Router1 have not had any configurations applied? (Choose two)

Which two devices can interfere with the operation of a wireless network because they operate on similar frequencies? (Choose two.)

Refer to the exhibit. A network administrator has recently installed a new router in the NY office and has established a console connection with the new router. The administrator is unable to backup the configuration file and IOS to a TFTP server that is located in the Atlanta office. What is the cause of this problem?

Why would a network administrator configure port security on a switch?