The Network layer
The Network layer handles connectivity of the Hitachi Content Platform to the network, and includes packet traffic to and from the server. Using the tests available in this layer, administrators can determine whether the network link to the target server is available or not, the bandwidth availability, the rate of packet transmissions to and from the host and and the uptime of the server. In addition, the administrators can also determine the operational state of the network interfaces and the reason why any interface is down.
The Device Uptime and Network Interfaces tests have been discussed in the Cisco Router