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As a message traverses a network from one application on one host, down through the OSI model, out through the physical layer, and up another machine s OSI model, the data is encapsulated at each layer This can be viewed as an envelope inside an envelope scheme As only specific envelopes are handled at each layer, only the necessary information for that layer is presented on the envelope At each layer, the information inside the envelope is not relevant and previous envelopes have been discarded only the information on the current envelope is used This offers efficient separation of functionality between layers This concept is illustrated in Figure B-3
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Figure B-3 OSI message encapsulation
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Appendix B: OSI Model and Internet Protocols
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As a message traverses the OSI model from the application layer to the physical layer, envelopes are placed inside bigger envelopes This increases the packet size, but this increase is known and taken into account by the higher-level protocols At each level, a header is added to the front end, and it acts to encapsulate the previous layer as data At the physical level, the bits are turned into the physical signal and are transmitted to the next station At the receiving station, the bits are turned into one large packet, which represents the original envelope-within-envelope concept Then each envelope is handled at the appropriate level This encapsulation exists at the transport layer and lower, as this is the domain of a packet within a session
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To help variable systems understand the functions performed in network communication, a common framework is necessary This framework is provided by the OSI and Internet network models, which specify which functions occur, and in what order, in the transmission of data from one application to another across a network An understanding of the OSI model and thus the state in which the data exists as it transits a network enables a deeper understanding of issues related to security Understanding that SSL occurs before TCP and IP allows you to understand how SSL protects TCP and IP from outside sniffing Understanding the different protocols and what happens with data loss gives you a better understanding of how certain types of attacks are performed The essence of a framework is to allow enhanced understanding of relationships, and these network models perform this function for network professionals
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GLOSSARY
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3DES Triple DES encryption three rounds of DES encryption used to improve security 80211 A family of standards that describe network protocols for wireless devices 8021X An IEEE standard for performing authentication over networks acceptable use policy (AUP) A policy that communicates to users what specific uses of computer resources is permitted access A subject s ability to perform specific operations on an object, such as a file Typical access levels include read, write, execute, and delete access control Mechanisms or methods used to determine what access permissions subjects (such as users) have for specific objects (such as files) access control list (ACL) A list associated with an object (such as a file) that identifies what level of access each subject (such as a user) has what they can do to the object (such as read, write, or execute) Active Directory The directory service portion of the Windows operating system that stores information about network-based entities (such as applications, files, printers, and people) and provides a structured, consistent way to name, describe, locate, access, and manage these resources ActiveX A Microsoft technology that facilitates rich Internet applications, and therefore extends and enhances the functionality of Microsoft Internet Explorer Like Java, ActiveX enables the development of interactive content When an ActiveX-aware browser encounters a web page that includes an unsupported feature, it can automatically install the appropriate application so the feature can be used
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