A network administrator of a company has many branch locations each using a subnet mask of 255.255.255.224. Which of the following dynamic routing protocols should be used？（）

Auserisunabletoconnecttothenetwork.Anetworktechnicianisabletodeterminethatthereisaproblemontheswitch.Allotherusersonthatswitchareabletoconnectsuccessfullytothenetwork.Whichofthefollowingisaprobablecause？（）

A.Switching loop is occurring on the switch.
B.Wrong subnet mask on the switch.
C.Incorrect SNMP settings on the switch.
D.Port is misconfigured on the switch.

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WhichofthefollowingprotocolswouldamultilayerswitchusetolearntheIPaddressofadirectlyconnecteddevice？（）

A.ARP
B.BOOTP
C.Inverse-ARP
D.DNS

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