多项选择题

What are five of the seven layers that are found in the OSI model?（）

A.application
B.protocol
C.session
D.transport
E.physical
F.gateway
G.data link

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Cisco Technical Support Services portfolio provide customers resources that help ensure that Cisco products operate efficiently, remain highly available, and benefit from up-to-date system software. Is it correct?（）

A.Yes
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Which Cisco product is a software component that blocks unwanted connections and provides other gateway security functions for small business?（）

A.Cisco Internetwork Operating System (IOS) Firewall
B.Cisco Secure Access Control Server (ACS)
C.Cisco Firewall Services Module (FWSM)
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What is the Cisco collaboration per-person licensing option that simplifies purchasing and provides customers with maximum flexibility?（）

A.Cisco Unified Collaboration Licensing
B.Cisco Unified Communications Software Subscription
C.Cisco Unified Workspace Licensing
D.Cisco User Connect Licensing