Network Attacks - 9/19/2007 1 Network Attacks Network...

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Unformatted text preview: 9/19/2007 1 Network Attacks Network Attacks Wm. Arthur Conklin, PhD Assistant Professor Department of Information & Logistics Technology College of Technology Protocols o A protocol is an agreed upon format for exchanging information. o A protocol will define a number of parameters: Type of error checking Data compression method Mechanisms to signal reception of a transmission o There are a number of protocols that 2 have been established in the networking world. 9/19/2007 2 OSI Reference Model o ISO standard describing 7 layers of protocols Application : Program-level communication Presentation : Data conversion functions, data format, data encryption Session : Coordinates communication between endpoints. Session state maintained for security. Transport : end-to-end transmission, controls data flow Network : routes data from one system to the next Data Link : Handles passing of data between nodes 3 nodes Physical : Manages the transmission media/HW connections o You only have to communicate with the layer directly above and below The OSI Model Application Layer Each layer serves only its Network Layer Transport Layer Session Layer Presentation Layer adjacent layers. Thus the software which implements the Transport Layer receives input from the Session Layer or the Network Layer These Layers Implemented By Software Such as an Operating System 4 Physical Layer Data-Link Layer Network Layer. Implemented By Hardware 9/19/2007 3 TCP/IP Protocol Suite o TCP/IP refers to two network protocols used on the Internet: Transmission Control Protocol (TCP) Internet Protocol (IP) Current Version is V4 Moving to V6 o TCP and IP are only two of a large group of protocols that make up the entire suite o A real-world application of the layered concept. 5 o There is not a one-to-one relationship between the layers in the TCP/IP suite and the OSI Model. OSI and TCP/IP comparison Application TCP/IP Protocol Suite NFS FTP Telnet OSI Model Presentation Session Transport Network FTP, Telnet, SSH, SMTP SMB HTTP, NNTP RPC TCP,UDP IP ICMP Application-level protocols Network-level Data-link Physical ARP Physical protocols 9/19/2007 4 Communication Between Two Networks Via the Protocol Stack Application Data Data Windows Machine on an Ethernet Linux Machine on a FDDI A Windows Machine Sending data to a linux machine Data-Link Network Transport Session Presentation...
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Network Attacks - 9/19/2007 1 Network Attacks Network...

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