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158 (6)
158 .235 (6)
Lecture

Networks Security and the Internet Lecture 1.pdf

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Department
158
Course
158 .235
Professor
Arno Leist
Semester
Spring

Description
158.235 Networks, Security and the Internet Network Types LAN – Local Area Network – room, building, group of PC’s that share a circuit. BN – Backbone Network – less than a few kms, high speed backbone linking together organizational LANs. MAN – Metropolitan Area Network – more than a few kms, connects LANs and BNs, size of a city. WAN – Wide Area Network – Global scale, far greater than 10 kms. Intranet vs. Extranet Intranet: LAN that uses the internet technologies within an organization. Only available to those in the organization. Eg. The Warehouse intranet for staff members. Extranet: LAN that uses the internet technologies across an organization, open to those invited users outside the organization. Eg. The Warehouse website for customers to browse products. Multi-Layer Network Models Open System Interconnection Model (OSI Model): Historic Created by International Standards Organisation(ISO) in 1984. 7 Layers 1. Physical 5. Session 2. Data Link 6. Presentation 3. Network 7. Application 4. Transport “Please Do Not Touch Steve’s Pet Alligators” Internet Model: Popular Created by DARPA in 1970’s Developed to solve the problem of internetworking 5 Layers 1. Physical 4. Transport 2. Data Link 5. Application also covers session and 3. Network presentation layers “Please Do Not Touch Alligators” Protocols Used by the network model layers Sets of standardi
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