I was asked the following questions when applying for a job, How did I do with my answers?

What is the difference between a layer 2 and layer 3 network?

Layer 2 specifies transmission of frames between connected nodes on the physical server

Layer 3 is used for addressing, routing and traffic control of a multi node network 

What use does a VPN have within a business?

A Virtual Private Network allows for a secured networked environment with end to end encryption that only authorized personnel will have access to.

What is the difference between a security and distribution group?

A distribution group is used for the distribution of emails to groups of users. A security group is used to assign access rights to users for specific resources i.e applications/ shared folders.

A user cannot login to their machine, as they have this error message: 
“The trust relationship between this workstation and the primary domain failed”. How do you fix this?

Using an Admin Account I would reset the users password via Active Directory 

What are DHCP Options used for? 

Dynamic Host Control Protocol is used to automatically assign IP Addresses to clients on the network