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Plan Security for Data Transmissions
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ny good book on networking with sections on network security would not be complete without some discussion of the Open Systems Interconnection (OSI) model The OSI model came about as a way of providing a standard
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CHAPTER 6 Planning Network Security
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A domain-level group policy called WLAN Policy
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The details of the WLAN policy reveal that users can connect only to the Marketing WLAN and the Sales WLAN
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of communication across systems It was built upon the idea of a series of layers for communication that add and remove the layer-specific information and then pass the information to the next layer The direction the information is passed, up to a higher layer or down to a lower layer, is dependent on the direction of the communication, inbound or outbound, respectively Table 64 shows a diagram of the OSI model and some of the protocols that function at the different layers When we talk about securing the data transmissions across the network, we need to factor in the different layers of the OSI model so that we can determine exactly what protocols require the secure communications From there, it is a matter of finding the utilities or features that provide the data transmission security IPSec runs at the network layer, which is why it is so commonly used As data flows down the OSI stack, each layer adds new information to the packet of information given by the layer above When IPSec is enabled, the data coming into the network layers is encrypted and then handed to the data link layer for
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TABLE 64
Layer Number
The Open System Interconnection Reference Model Common Uses/ Protocols
Common applications: Outlook, Internet Explorer, Telnet Common protocols: POP/SMTP, HTTP, FTP, DNS, SNMP, HTTPS Common ports: 25, 80, 23, 53, 161 Common Protocols: TCP, UDP
Name
Application
Defined
This layer supports end-user applications for things like e-mail, web browsing, file transfer, remote administration, and more The presentation layer is responsible for transforming data into a format usable by the application it is providing it to in the application layer The role of the session layer is to initiate, maintain, and end connections between communicating systems As its name would imply, the transport layer is responsible for the end-to-end communication between systems and manages the flow control of data, while also ensuring successful data transfer The network layer is the layer that helps us get to all of the different servers we need by performing the necessary routing and switching to get from source system to destination system At the data link layer, all of our data gets changed into bits capable of being processed on the wire And last but not least, the physical layer is where all of the bits are moved from one location to another over some physical medium
Presentation
Session
Transport
Network
Common Protocols: Internet Protocol (IP) versions 4 and 6
Data link
Common protocols: PPP, SLIP ADSL, Coaxial Cable, Cat-5, ATM, ISDN
Physical
CHAPTER 6 Planning Network Security
transformation and preparation for delivery Once the encrypted information reaches its source and the data begins flowing up the OSI stack, information is removed at each layer and passed to the layer above So as the data gets passed into the network layer, IPSec will decrypt the information and hand it off to the transport layer
Exam Tip
Though you may not be tested directly about the OSI reference model, you should have a solid understanding of how information flows up and down the stack when sent from source to destination
Secure Data Transmissions Between Systems to Meet Security Requirements
Earlier, we discussed planning our implantation of IPSec as part of our overall security architecture; however, it is important to understand the significance of IPSec on your network IPSec adds a considerable amount of overhead to packets transferred between systems As with anything that you implement for security, every time you gain an advantage in one column, you add a disadvantage to another column With IPSec, that disadvantage is the added network overhead that causes a drop in communication efficiency Once again, this is the reason why we implement a feature like IPSec in locations throughout the network where such implementation has been deemed necessary Certainly, we could just force IPSec down to every system under our control and be done But in this pay me now or pay me later trade-off with IPSec, you may end up being so secure that your users can t do anything in a timely manner
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