Multilayer network communication protocols provide standards that allow diverse systems to communicate with each other. Learn about the Distributed Network Protocol, or DNP3. DNP3 is a set of networking protocols designed specifically for use in class of systems known as Supervisory Control And Data Acquisition, or SCADA systems.
- [Instructor] Multi-Layer Network communication protocols provide standards that allow diverse systems to communicate with each-other over a network. The most common multi-layer protocol that security professionals encounter is the TCP/IP suite of network protocols. TPC/IP powers the internet, and almost every Local Area Network on the planet today. However, TCP/IP is not the only multi layer protocol that CISSP candidates need to be familiar with.
The distributed network protocol, or DNP3, is a set of networking protocols designed specifically for use in a class of systems known as supervisory control and data acquisition, or SCADA systems. DNP3 facilitates communications between devices using three distinct components. First, the purpose of these systems is to allow the collection of data from intelligent electronic devices, that are located at a series of remote substations, and to transmit control commands to those devices.
Each one of these remote substations has a remote terminal unit, or RTU, that provides connectivity for all of the intelligent electronic devices at that substation. This data then needs to travel over communications links. These communication links are sometimes very low speed connections that are used to reach remote sites. They could be wired connections, even using dial-up modems, copper wires, or fiberoptics. They also might make use of radio communications over RF frequencies, microwaves, or using spread spectrum technology.
Data travels over those communication links, to and from the final component of the DNP3 network, the SCADA master station. This is the centralized control point that collects data from the intelligent electronic devices, and transmit control commands back to the remote sites. The centralized control point may serve as the point where administrators actually control the system, or those administrators may use a set of external control points to manipulate the SCADA system. If you haven't already watched it, you'll learn more about SCADA systems in my course covering CISSP domain three, Security Engineering, where I cover SCADA and industrial control systems in further detail.
When you compare DNP3 to the OSI model, you'll find that it covers the entire range of the OSI stack. From the physical communication links of layer one, all the way to application interface instructions of layer seven.
Learn about communication and networking best practices, including TCP/IP networking, network security devices, and secure network design and management. Instructor and cybersecurity expert Mike Chapple also includes coverage of converged protocols, network encryption, and wireless networking. You can find Mike's companion study books for this series at the Sybex test prep site and review the complete CISSP Body of Knowledge at https://www.isc2.org/cissp-domains/default.aspx.
- IP addressing
- Switches and routers
- Content distribution networks
- Designing secure networks
- Specialized networking
- Managing secure networks
- Working with virtualized networks like SDNs
- Detecting and preventing network attaches
- Transport encryption
- Wireless networking
- Host security