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CompTIA Security+ Certification Guide by Ian Neil

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Account types

Each user in a system needs an account to access the network in a Microsoft Active Directory environment; the user account has a Security Identifier (SID) linked to the account. When I create a user called Ian they may have an SID of SID 1-5-1-2345678-345678. When the account is deleted the SID is gone and a new SID is created.

For example, a member of the IT team has deleted a user account called Ian—it may have a SID of SID 1-5-1-2345678-345678, so he quickly creates another account called Ian but this account cannot access resources as it has a new SID of SID 1-5-1-2345678-3499999. The first portion from left to right, identifies the domain and then the remainder is a serial number that is never reused.

There are various ...

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