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Advanced Protocols and Network Security Lecture 2

by: A. Dighe

Advanced Protocols and Network Security Lecture 2 530

Marketplace > Iowa State University > CPR E > 530 > Advanced Protocols and Network Security Lecture 2
A. Dighe
GPA 3.75

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About this Document

Today’s Topics • Protocol Specifications • Protocol Addresses • Protocol Headers
Network Security
Jacobson Doug
Class Notes
25 ?




Popular in Network Security

Popular in CPR E

This 9 page Class Notes was uploaded by A. Dighe on Friday July 29, 2016. The Class Notes belongs to 530 at Iowa State University taught by Jacobson Doug in Summer 2016. Since its upload, it has received 14 views. For similar materials see Network Security in CPR E at Iowa State University.


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Date Created: 07/29/16
CprE 530 Advanced Protocols and Network Security Lecture 2 1 Today’s Topics • Protocol Specifications • Protocol Addresses • Protocol Headers 2 Protocol Specifications • Open vs. Closed • Specification methods –English descriptions –Flow & timing diagrams –Open to interpretation • Implementation flaws 3 Network Standards • Specifies –Services provided –Services expected –Functions provided –Protocol and packet formats –Timing and sequence of the packets 4 Standards Organizations • American National Standards Institute (ANSI): ANSI is a private organization whose membership is made up of professional societies, government groups and other associations. They develop standards that help groups complete in the global market. • Institute of Electrical and Electronics Engineers (IEEE): IEEE is an international professional society that creates international standards in many different areas. • International Standards Organization (ISO): A group whose membership is standards committees from across the world. ANSI represents the United States on ISO. • International Telecommunications Union-Telecommunications Standards Sector (ITU-T): A group created by the United Nations that creates standards primarily for the phone system. • Internet Engineering Task Force (IEFT): This group develops standards for the Internet and consists of members from various organizations and is open to any person that has an interest. 5 Addressing Sender Recipient Street Address Street Address LA DC Street Corner CHI Postal System Network 6 Addressing 7 Addresses Application user address: identifies items within the Application Application application 1 2 Application port number: Identifies the instance of application UDP TCP Transport Protocoltype: Identifies the transport layer used Global Network Layer Address: IP Other Identifies the device Protocoltype: Identifies which protocolis carried in the packet TCP/IP HardwareAddress: Network Identifies which device on the physicalnetwork 8 Address Assignment - How • Static –Configuration –Built in • Dynamic –Protocol discovery –User provided 9 Address Assignment – Who • Central Authority • Ad-hoc • Locally based 10 Hardware address assignment • Hardware –Vendor assigned –Address used as a filter –Address can be changed 11 IP address assignment • Global address allocation • Address assignment –Protocol based (DHCP) –Static –Locally controlled • Addresses can be changed 12 Application address assignment • Port Number (much less control) –Well known ports –Protocol based discovery –Configuration based –User input based 13 Hostname assignment • Often political and/or commercially driven • Assignment via central authority • Protocol to find the IP address given a name (DNS) 14 Protocol Headers • Fixed packet type –Easy to parse –Limited functionality • Freeform type –Harder to parse –Easy to extend 15 Fixed packet header Fixed Options Payload Trailer Fixed: Payload dataayer addresses and payload type) Controldata Header data OpExtended fixed data Optionalcontroldata OptionalPayload control Payload: Content is not a concern of the header Trailer: Optionalfield often used for error control 16 Freeform header <Start Header> <Data type = application 7> <Data length = 400> <Data encoding = ASCII> </End Header> <Start Data> (the data) </End Data> 17


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