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Eg shutting down system access when they leave.
Onboarding policies.
Ensuring new employees are aware of any policies that are in existence, and ensure they understand them.
See Policies
Ensuring only limited access is granted within the probation period where possible.
Of course, if they are coming onboard as a system administrator, then they need the keys to the kingdom on day one, so that is a huge risk that you need to be aware of.
Ensuring keys and access passes are returned. This is predicated on having good systems to ensure that you know when people are joining and leaving the company. It is surprising how difficult this is for many orgs.
Networks
A huge area. Different if you just have a simple wifi network and use cloud apps vs having on premise servers.
Are you required to share network access with another company.
Is there any regulatory controls that impact your network operations.