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Table B Sharing permission NTFS permission Net permission Marketing group Change Read Read Managers group None Modify None Everyone group Read None None Cumulative permission Read (for NTFS), with a net result of None. So Sarah’s permissions are the least restrictive of Read and None—in other words, Read. So no, she cannot make changes (see Table A). Now, suppose Tim adds another group to his list of NTFS permissions: Managers. He gives the Managers group Modify access to FOLDER-A. If Sarah is a member of the Managers group, will she now be able to make changes to PRIVATE.DOC? The answer is still no, because even though permissions are cumulative within a type, they’re calculated as a whole on each group. As you can see below, the new Managers group has no net permission to the folder because it has no sharing permission, so it doesn’t enable Sarah to modify the file (see Table B). If Tim wanted to make sure Sarah had the ability to modify the file, he could: HINT Permission changes don’t take effect until the end user logs off and logs back on. After Tim changes the permissions, Sarah must log off and back on again or close the network connection to Tim’s PC and reopen it in order for his permission changes to take effect on Sarah’s end. X Give the Marketing group Modify (or better) permission under NTFS permissions. X Give the Managers group Change permission under sharing permissions. Let’s say Tim takes the first option and changes the Marketing group’s NTFS permission to Modify. Now the chart looks like Table C. Table C Sharing permission NTFS permission Net permission Marketing group Change Modify Change/Modify Managers group None Modify None Everyone group Read None None Cumulative permission Change/Modify Table D Sharing permission NTFS permission Net permission Marketing group Change Modify Change/Modify Managers group None Deny Write Deny Write Everyone group Read None None Cumulative permission Deny Write File and Share Permissions 91
