Specifies the electrical, mechanical, procedural, and functional requirements for activating, maintaining, and deactivating the physical link between end systems. Examples of physical link characteristics include voltage levels, data rates, maximum transmission distances, and physical connectors. | Telecommunications and Networking Note: these are slides that were part of a CISSP prep course that I partly developed and taught while I was with Ernst and Young. While these slides are dated – August 1999 - the core information is still relevant. Contact me w/ any questions or comments – Ben Rothke, CISSP brothke@ CBK REVIEW - August 1999 Upon completion of this lesson, you will: Explain and understand the OSI model Identify network hardware Understand LAN topologies Know basic protocols - routing and routed Understand IP addressing scheme Understand subnet masking Understand basic firewall architectures Understand basic telecommunications security issues Objective CBK REVIEW - August 1999 Course Outline Intro to OSI model LAN topologies OSI revisited hardware bridging,routing routed protocols, WANs IP addressing, subnet masks Routing Protocols CBK REVIEW - August 1999 OSI/ISO ?? OSI model developed by ISO, International Standards Organization IEEE - Institute of . | Telecommunications and Networking Note: these are slides that were part of a CISSP prep course that I partly developed and taught while I was with Ernst and Young. While these slides are dated – August 1999 - the core information is still relevant. Contact me w/ any questions or comments – Ben Rothke, CISSP brothke@ CBK REVIEW - August 1999 Upon completion of this lesson, you will: Explain and understand the OSI model Identify network hardware Understand LAN topologies Know basic protocols - routing and routed Understand IP addressing scheme Understand subnet masking Understand basic firewall architectures Understand basic telecommunications security issues Objective CBK REVIEW - August 1999 Course Outline Intro to OSI model LAN topologies OSI revisited hardware bridging,routing routed protocols, WANs IP addressing, subnet masks Routing Protocols CBK REVIEW - August 1999 OSI/ISO ?? OSI model developed by ISO, International Standards Organization IEEE - Institute of Electrical and Electronics Engineers NSA - National Security Agency NIST - National Institute for Standards and Technology ANSI - American National Standards Institute CCITT - International Telegraph and Telephone Consultative Committee CBK REVIEW - August 1999 OSI Reference Model Open Systems Interconnection Reference Model Standard model for network communications Allows dissimilar networks to communicate Defines 7 protocol layers (. protocol stack) Each layer on one workstation communicates with its respective layer on another workstation using protocols (. agreed-upon communication formats) “Mapping” each protocol to the model is useful for comparing protocols. CBK REVIEW - August 1999 OSI MODEL DIAGRAM Provides data representation between systems Establishes, maintains, manages sessions example - synchronization of data flow Provides end-to-end data transmission integrity Switches and routes information units Provides transfer of units of information to other end of physical .
