Which of the following protocols would a multilayer switch use to learn the IP address of a directly connected device？（）

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

单项选择题WhichofthefollowingnetworkdevicesoperatesonLayer1oftheOSImodel？（）

A.Hub
B.Switch
C.Router
D.Bridge

单项选择题Anetworktechnicianisinstallingaseriesofthreeaccesspointstocovertheentirewingofabuilding.Eachaccesspointhasawiredconnectionand802.11gisbeingusedforthewirelesstransmission.Whichofthefollowingchannelsshouldbeusedfortheaccesspoints？（）

A.Channels 1-6-11
B.Channels 1-3-5
C.Channels 7-11-1
D.Channels 2-4-6