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6 Networking Pt.1 - CET 4663 Networking Part 1 Last Time We...

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CET 4663 Networking Part 1
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Last Time We talked about encryption Symmetric-key Public-key We are going to jump around a bit now Networking
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Network Communication Many security related issues Confidentiality Integrity Availability Extremely complex system Many points of vulnerability
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How does it all work anyway? Question: When you communicate from one computer to another, what is really going on? Answer: A lot
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Moving Data on a Network Many different tasks required to move data One computer wants to communicate with another computer Application to application communication Network to network communication Point to point communication Physical media communication
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Layered Model To accomplish these varied tasks we break the problem down into separate layers OSI 7-Layer model Somewhat idealized model of network comm
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History Rapid growth of computer networks caused compatibility problems ISO recognized the problem and released the OSI model in 1984 OSI stands for Open Systems Interconnection and consists of 7 Layers The use of layers is designed to reduce complexity and make standardization easier
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7 Layers of the OSI Model Layer Responsible For: 7.) Application Provides Services to User Apps 6.) Presentation Data Representation 5.) Session Communication Between Hosts 4.) Transport Flow Ctrl, Error Detection/Correction 3.) Network End to End Delivery, Logical Addr 2.) Data Link Media Access Ctrl, Physical Addr 1.) Physical Medium, Interfaces, Puts Bits on Med.
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Examples Layer Example 7.) Application HTTP, FTP, SMTP 6.) Presentation ASCII, JPEG, PGP 5.) Session BOOTP, NetBIOS, DHCP, DNS 4.) Transport TCP, UDP, SPX 3.) Network IP, IPX, ICMP 2.) Data Link Ethernet, Token Ring, Frame Relay 1.) Physical Bits, Interfaces, Hubs
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