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？（）

单项选择题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.

单项选择题WhichofthefollowingprotocolswouldamultilayerswitchusetolearntheIPaddressofadirectlyconnecteddevice？（）

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

单项选择题Whichofthefollowingisthedefaultportfortelnet？（）

A.20
B.21
C.22
D.23

单项选择题Given the following routing table entries， which of the following will the next-hop address be for a packet destined for the address 192.168.1.203？（）

A.77.0.5.5
B.40.40.0.254
C.66.40.90.121
D.72.40.91.1

多项选择题WhichofthefollowingareformsofgigabitEthernetthatrequiretheuseoffiberopticcables？（）

A.1000Base-CX
B.1000Base-TX
C.1000Base-SX
D.10Base-T
E.1000Base-T
F.1000Base-LX