The IT Stuff

Enough space for cabling and access to the side and back of server racks and other equipment, and you must have enough height to accommodate a raised floor as well as the extra air-conditioning and ventilation ducts requirements based on your existing needs and well as three to five years into the future..
Should try to [...]

Simple Network Management Protocol (SNMP) is used in network management systems to monitor network-attached devices for conditions that warrant administrative attention.
A managed device can be any piece of equipment that sits on your data network and is SNMP compliant. Routers, switches, hubs, workstations, and printers are all examples of managed devices.
An agent is typically software [...]

System & Service monitoring

Reachability, availability

Resource measurement/monitoring

Capacity planning, availability

Performance monitoring (RTT, throughput)‏

Statistics & Accounting/Metering

Fault Management (Intrusion Detection)‏

Fault detection, troubleshooting, and tracking

Ticketing systems, help desk

Change management & configuration monitoring

Not Cover by the Network management

Provisioning
Processes associated with allocation and configuration of resources.
Security aspects in depth
Basic security comes from proper administration and management of your network.