单项选择题
What Cisco IOS feature examines packets received to make sure that the source address and interfaceare in the routing table and matck the interface that the packet was received on？（）
A.MPLS Traffic Engineering
B.Dynamic access-lists
C.Authentication
D.Receive ACL
E.Unicast RPF
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TypicalADSLbroadbandInternetaccessrequiresausernameandpasswordtobeenteredonend-userPCconnectedtotheADSLmodeminorderfortheendusertogainaccesstotheInternet.ifaCiscoADSLrouterisusedinsteadofanADSLmodem，whatfunctionalityisrequiredontheCiscoADSLroutersotheend-userconnectedtotheCiscoADSLroutercanaccesstheInternetwithoutenteringausernameandpassword？（）
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