DNS Different Types of Resource Records and detail explanation Forward and reverse zones What is the difference between stub and forwarding zones? What is the difference between forwarding and recursion? What is DNSSEC? Primary and Secondary Roles What are zone transfers? Recursive vs Iterative DHCP What are the steps to get an IP? DHCP Failover T1 and T2 timer Linux How do you measure and monitor system performance? How do you check if a service is running? How do you check what port protocols the service is operating on? Networking OSI/TCP IP model? VLAN? Static/Dynamic routing protocols How do you check your network traffic? Anycast

Networking basics DNS DHCP protocol DNS Queries and records