Eicon Networks S92 Manuel d'utilisateur télécharger pdf (Page 32)

YuChakTinMichael‘sGIACGCFWProjectAssignment

Page 32

n PolicyObjective7: Allinternalusers,aswellasallserversfrom the

Internal_Serverssegment, areallowedtosafelyaccesstheinternetviaproxying.

Intrusionviathisinternetlinkmustbeblocked.Therelevantpoliciesare

enforcedatISA_Cache,withadditionalprotectionsuchasJava/ActiveX

blockingprovidedbyNorton1_IDS,Norton2_IDSandNorton3_IDS.

WhydoweblockJavaandActiveXfortheusers?

JavaandActiveXmainlyrunontheusers’computers. Theyareclientside

Whydoweallowtheinternal serverstoaccesstheinternetviaproxying?

InGIAC,thereisnorealneedforserversintheInternal_Serverssegmentto

reachtheinternet.However,manyserversdorelyontheinternetasanupdate

medium(forexample,MicrosoftWindowsUpdate).Givingthemthecapability

toconnectallowscertaindegreeofflexibilityandproductivitygain.

WhydowedisallowtheRASuserstoaccessCritical_Resources?

InGIAC,theCritical_Resourcessegmentcontainsserverwithcriticaldatabase

records.Sincetheserecordscontaincriticalandsensitiveinformation,access

andupdatesmustbehandledseriously,andshouldbeconductedonlyinthe

office.Wedefinitelydonotwanttheserecordsto“leak”totheoutsideworldvia

thischannel.

WhydowedisallowtheRASuserstoaccesstheirowndesktops?

InGIAC,allresourcesaresupposedtobestoredintheservers.Byrestrictingthe

RASuserstoaccessonlytheservers,weareeffectivelyencouragingthemto

savefilesintheserversratherthantokeeplocalcopies.

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Eicon Networks S92 Manuel d'utilisateur Page 32