1. Network Monitoring
Charles Warren

2. What Comprises a Network?
What are some different devices or components that comprise a network?

3. The Scope of a Network A network is made of:
Computers: Servers, kiosks, workstations, laptops.
Network resources: Printers, projectors, consolidated communication devices.
Networking devices: Firewalls, routers, switches, IDS/IPS.
What do all of these devices need to have in common?

4. The Goal of Network Monitoring
Features of a network monitoring platform:
Route analytics: monitors the posture of networks.
Network tomography: monitors the health of connections.
Server monitoring: checks system metrics.
To monitor a computer network for slow or failing components and notify the network administrator in case of outages or other trouble.

5. Methods of Communication and Discovery
Many different concepts are utilized in network monitoring, here are the most common:
SNMP
ICMP
Service Accounts
Why is network monitoring an important feature of any system?
What services should be monitored in an enterprise system?

6. Simple Network Management Protocol
Components of SNMP:
Managed Devices
Agent
Network Management Station
Protocol Details:
Traps: PDUs that are sent from the agent to the manager without being explicitly requested.
Community Strings: SNMPv1 and SNMPv2 use communities to establish trust between managers and agents.
A managed device is a network node that implements an SNMP interface that allows unidirectional (read-only) or bidirectional (read and write) access to node-specific information. Managed devices exchange node-specific information with the NMSs. Sometimes called network elements, the managed devices can be any type of device, including, but not limited to, routers, access servers, switches, cable modems, bridges, hubs, IP telephones, IP video cameras, computer hosts, and printers.
An agent is a network-management software module that resides on a managed device. An agent has local knowledge of management information and translates that information to or from an SNMP-specific form.
A network management station executes applications that monitor and control managed devices. NMSs provide the bulk of the processing and memory resources required for network management. One or more NMSs may exist on any managed network.