CISSP Online Training Video | Communications and Network Security

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• published: 21 Sep 2015
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http://www.simplilearn.com/it-security-management/cissp-certification-training?utm_campaign=Cissp-communication-networking-n6S5wR-NDyc&utm;_medium=SC&utm;_source=youtube Communication and Network Security Domain 4 of the CISSP certification course offered by Simplilearn. This domain provides an introduction to the Communications and Network Security. After completing this domain, you will be able to: ● Describe the various secure network architectures and designs ● Recognize the importance of securing network components ● List the different secure communication channels ● List the common network attacks and the countermeasures Importance of Communication and Network Security At the Minnesota plant, a vendor who had visited the plant used his laptop to complete a few transactions. He connected to the wireless after taking approvals. He used his flash drive to take back up of the transactions. The flash drive had viruses and these entered the network through his laptop, causing the local server to crash. This had far-reaching effects. Introduction to Secure Network Architecture and Design Various communication protocols define communication. The protocols can be grouped into stacks, family, or suite. There are two most popular models, OSI and TCP/IP Models. Both the models divide communication into different layers. Each layer addresses specific requirements of the communication process. Security can be addressed more efficiently using the layered approach. Open Systems Interconnection Let us now discuss the OSI Reference model. International Organization for Standardization (ISO) created the Open Systems Interconnection (OSI) reference model in the early 1980s. The purpose was to help vendors create interoperable network devices. OSI is a standard model for network communications, which allows dissimilar networks to communicate. The OSI reference model describes how data and network information are communicated from one computer to another computer, through a network media. The OSI reference model breaks this approach into seven distinct layers, also called the protocol stack. Layering divides a piece of data into functional groups that permit an easy understanding of each piece of data. “Mapping” each protocol to the model is useful for comparing protocols. Each layer has unique set of properties and directly interacts with its adjacent layers. In the process of data encapsulation, data from one layer is wrapped around a data packet from an adjoining layer. Each layer on one workstation communicates with its respective layer on another workstation using protocols that are agreed-upon communication formats. The OSI reference model as follows, Physical Layer, Data-Link Layer, Network Layer, Transport Layer, Presentation Layer, and Application Layer. Working of the OSI Model Let us now understand the working of the OSI Model. Data is sent from a source to a destination computer. In a layered architecture model, the data passes down through each layer from the highest (Application Layer, Layer seven in the OSI model) to the lowest layer (Physical Layer, Layer one of the OSI model) of the source. It is then transmitted across the medium (cable) and is received by the destination computer, where it is passed to the layers in the opposite direction from the lowest (Layer one) to the highest (Layer seven). Each protocol operates at specific layers. Each protocol in the source computer has a job allocated. They are responsible for attaching its own unique information to the data packet when it comes to its layer. When the data packet reaches the destination computer, it moves up the model. Each protocol detaches and examines only the data that was attached by its protocol counterpart at the source computer; then it sends the rest of the packet up the protocol stack to the next higher layer. Each layer at the individual destination sees and deals only with the data that was packaged by its counterpart on the sending side. Watch full video for more information. For more updates on courses and tips follow us on: - Facebook : https://www.facebook.com/Simplilearn - Twitter: https://twitter.com/simplilearn Get the android app: http://bit.ly/1WlVo4u Get the iOS app: http://apple.co/1HIO5J0