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Question 9 : What is a key security consideration when a NAS device enables sharing of the same data among UNIX and Microsoft Windows users?

A. NAS device must map UNIX permissions to Windows and vice versa

B. NAS defines and maintains ownership to the objects

C. NIS server must separately maintain SIDs for UNIX and Windows environments

D. Object permissions are not defined in advance and assigned dynamically

Answer: A

ExplanationAuthorization defines user privileges in a network. The authorization techniques for UNIX users and Windows users are quite different. UNIX files use mode bits to define access rights granted to owners, groups, and other users, whereas Windows uses an ACL to allow or deny specific rights to a particular user for a particular file. Although NAS devices support both of these methodologies for UNIX and Windows users, complexities arise when UNIX and Windows users access and share the same data. If the NAS device supports multiple protocols, the integrity of both permission methodologies must be maintained. NAS device vendors provide a method of mapping UNIX permissions to Windows and vice versa, so a multiprotocol environment can be supported.

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