多项选择题
Why does the data communication industry use the layered OSI reference model? (Choose two.)（）
A.It divides the network communication process into smaller and simpler components， thus aiding component development， design， and troubleshooting.
B.It enables equipment from different vendors to use the same electronic components， thus saving research and development funds.
C.It supports the evolution of multiple competing standards， and thus provides business opportunities for equipment manufacturers.
D.It encourages industry standardization by defining what functions occur at each layer of the model.
E.It provides a means by which changes in functionality in one layer require changes in other layers.
相关考题
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多项选择题
AninboundaccesslisthasbeenconfiguredonaserialinterfacetodenypacketentryforTCPandUDPports21,23and25.WhattypesofpacketswillbepermittedbythisACL?(Choosethree.)（）
A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3 -
多项选择题
WhichtwopasswordsmustbesuppliedinordertoconnectbyTelnettoaproperlysecuredCiscoswitchandmakechangestothedeviceconfiguration?(Choosetwo.)（）
A.console password
B.vty password
C.aux password
D.tty password
E.enable secret password
F.username password -
多项选择题
TheOSPFHelloprotocolperformswhichofthefollowingtasks?(Choosetwo.)（）
A.It provides dynamic neighbor discovery.
B.It detects unreachable neighbors in 90 second intervals.
C.It maintains neighbor relationships.
D.It negotiates correctness parameters between neighboring interfaces.
E.It uses timers to elect the router with the fastest links as the designated router.
F.It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF
