Osi Mode Layers
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Squatty.com - OSI Cheat Sheet
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April 08, 2003
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The Open Systems Interconnect (OSI) model is something every good geek should know. I came across this nifty OSI reference during my recent review of the CISSP Telecommunications and Network Security domain. I added a few notes and put together a quick visio to form the below cheat sheet....
Open Systems Interconnect Model OSI segments networking tasks, processes, and services into different layers. Each layer has its own responsibilities when it comes to how two computers communicate over a network. Each layer has certain functionalities and the services and protocols that work within that layer to fulfill them. Each protocol at a specific OSI layer communicates with a protocol that operates at the same OSI layer on another computer. This happens through encapsulation. A message is constructed at the application layer and then passed down through the protocol’s stack. Each layer adds its own information to the message; thus, the message grows in size as it goes down the protocol stack. The message is then sent to the destination computer and the encapsulation is reversed by taking the message apart through the same steps as the source computer that encapsulated it. This is how computers communicate logically. Each layer adds its own information to the packet and then each layer at the destination computer only takes information that pertains to it.
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Security: Confidentiality, authentication, data integrity, non-repudiation Layer 7
Application
Technology: gateways Protocols: FTP, SMB, TELNET, TFTP, SMTP, HTTP, NNTP, CDP, GOPHER, SNMP, NDS, AFP, SAP, NCP, SET
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Includes the protocols that support the application. Responsible for all application-to-application communications. User information maintained at this layer is user data.
Mail Story to a Friend Printable Story Format
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Security: confidentiality, authentication, encryption
Chatterblock Total public Chats: 455 Sign in for private Messages No chat records on file
Technology: gateway Protocols: ASCII, EBCDIC, POSTSCRIPT, JPEG, MPEG, GIF
Username Enter Message Layer 6
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Security: None Technology: gateways Protocols: Remote Procedure Calls (RPC) and SQL, RADIUS, DNS, ASP Layer 5
Receives information from the application layer protocols and puts it into a format that all computers following OSI can understand. Responsible for the formatting of the data so that it is suitable for presentation. Responsible for character conversion (ASCII/EBCDIC), Encryption/Decryption, Compression, and Virtual Terminal Emulation. User information maintained at this layer is called messages. Responsible for the setup of the connection, maintaining of the connection, and the connection tear-down. Simplex – communication takes place in one direction Half-duplex – comm. takes place in both directions, only 1system can send info at a time.
Session
Full-duplex – comm. takes place in both directions, both systems send information at the same ime. Security: Confidentiality, authentication, integrity Layer 4
Transport
Technology: gateways Protocols: TCP, UDP, SSL, SSH2, SPX, NetBios, ATP Security: confidentiality, authentication, data integrity
Layer 3
Network
Technology: virtual circuits (ATM), routers Protocols: IP, IPX, ICMP, OSPF, IGRP, EIGRP, RIP, BOOTP, DHCP, ISIS, ZIP, DDP, X.25
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (2 of 4)10/7/2005 11:59:27 AM
Responsible for the guaranteed delivery of information. It is also responsible for error detection, correction, and flow control. Information at this layer is called datagrams. Responsible for the routing of data from one node to another through the network including the path selection. Logical addresses are used at this layer. Information maintained at this layer is called packets.
Squatty.com - OSI Cheat Sheet
Security: confidentiality Technology: bridges, switch
Layer 2
Data Link
Protocols: L2F, PPTP, L2TP, PPP, SLIP, ARP, RARP, SLARP, IARP, SNAP, BAP, CHAP, LCP, LZS, MLP, Frame Relay, Annex A, Annex D, HDLC, BPDU, LAPD, ISL, MAC, Ethernet, Token Ring, FDDI
Security: confidentiality Technology: ISDN, Hubs, Repeaters, Cables Layer 1
Physical
Protocols: 10BaseT, 100BaseT, 1000BaseT, 10Base2, 10Base5, OC-3, OC-12, DS1, DS3, E1, E3, ATM, BRI, PRI, X.23
Responsible for translating data into LAN or WAN binary format for proper line transmission. Formats the data frame…puts the correct info into the header. Responsible for the physical addressing of the network via MAC addresses. There are two sublevels to the Data-Link layer. MAC and LLC. The Data-Link layer has error detection, frame ordering, and flow control. Information maintained at this layer is called frames. Responsible for the physical transmission of the binary digits through the physical medium. This layer includes things such as the physical cables, interfaces, and data rate specifications. Information maintained at this layer is called bits (the 1s and 0s). Bits are converted into voltage for transmission.
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (3 of 4)10/7/2005 11:59:27 AM
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Copyright © 2004 Squatty.com
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Powered By GeekLog v1.3.9 Created this page in 0.35 seconds
(Advanced Search)
Search May 24, 2005 Welcome to Squatty.com Submit a Story
Site Menu
Links
Geek Links Geek Support » Geek Downloads » Config Tool Geek Docs » Plugin Manual Geek Demo Geek Directory
Login Username: Password:
It appears you arrived here from a Google search. You can also search Squatty. com's archives with your query.
Site Stats
About
FAQ
What's Related ●
April 08, 2003
Contributed by:squatty
Views: 1805
●
More by squatty More from How-to
Story Options ● ●
The Open Systems Interconnect (OSI) model is something every good geek should know. I came across this nifty OSI reference during my recent review of the CISSP Telecommunications and Network Security domain. I added a few notes and put together a quick visio to form the below cheat sheet....
Open Systems Interconnect Model OSI segments networking tasks, processes, and services into different layers. Each layer has its own responsibilities when it comes to how two computers communicate over a network. Each layer has certain functionalities and the services and protocols that work within that layer to fulfill them. Each protocol at a specific OSI layer communicates with a protocol that operates at the same OSI layer on another computer. This happens through encapsulation. A message is constructed at the application layer and then passed down through the protocol’s stack. Each layer adds its own information to the message; thus, the message grows in size as it goes down the protocol stack. The message is then sent to the destination computer and the encapsulation is reversed by taking the message apart through the same steps as the source computer that encapsulated it. This is how computers communicate logically. Each layer adds its own information to the packet and then each layer at the destination computer only takes information that pertains to it.
Login Don't have an account yet? Sign up as a New User
Google Helper
Forum
OSI Cheat Sheet
Home Privacy Policy Site Index » Topics Ask Squatty Development » How-to Geeklog News » Product Reviews Just Fun Site Updates
Downloads
Security: Confidentiality, authentication, data integrity, non-repudiation Layer 7
Application
Technology: gateways Protocols: FTP, SMB, TELNET, TFTP, SMTP, HTTP, NNTP, CDP, GOPHER, SNMP, NDS, AFP, SAP, NCP, SET
Search Now!
Donations Help me help you! By donating you ensure squatty.com a future!
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (1 of 4)10/7/2005 11:59:27 AM
Includes the protocols that support the application. Responsible for all application-to-application communications. User information maintained at this layer is user data.
Mail Story to a Friend Printable Story Format
Squatty.com - OSI Cheat Sheet
Security: confidentiality, authentication, encryption
Chatterblock Total public Chats: 455 Sign in for private Messages No chat records on file
Technology: gateway Protocols: ASCII, EBCDIC, POSTSCRIPT, JPEG, MPEG, GIF
Username Enter Message Layer 6
Send/Refresh
Presentation
Chatterlog
Top Downloads Order By: Blocks Hacks Plugins Themes Title
D/Ls
Weather - Entire World Database for Geeklog
3685
Google Search
2665
Industrial Grey
2248
Geeklog 1.3.7s2 - Gallery 1.3.4 Integration
2160
Site Calendar Block
2154
FileMgmt Plugin Ver 1.2 Final Release
2119
Weather Plugin 2.0
2097
Who's Online w/ IP plot
2009
Theme Changer
1899
Gallery Random Photo Block v1.2
1631
More Downloads
Security: None Technology: gateways Protocols: Remote Procedure Calls (RPC) and SQL, RADIUS, DNS, ASP Layer 5
Receives information from the application layer protocols and puts it into a format that all computers following OSI can understand. Responsible for the formatting of the data so that it is suitable for presentation. Responsible for character conversion (ASCII/EBCDIC), Encryption/Decryption, Compression, and Virtual Terminal Emulation. User information maintained at this layer is called messages. Responsible for the setup of the connection, maintaining of the connection, and the connection tear-down. Simplex – communication takes place in one direction Half-duplex – comm. takes place in both directions, only 1system can send info at a time.
Session
Full-duplex – comm. takes place in both directions, both systems send information at the same ime. Security: Confidentiality, authentication, integrity Layer 4
Transport
Technology: gateways Protocols: TCP, UDP, SSL, SSH2, SPX, NetBios, ATP Security: confidentiality, authentication, data integrity
Layer 3
Network
Technology: virtual circuits (ATM), routers Protocols: IP, IPX, ICMP, OSPF, IGRP, EIGRP, RIP, BOOTP, DHCP, ISIS, ZIP, DDP, X.25
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (2 of 4)10/7/2005 11:59:27 AM
Responsible for the guaranteed delivery of information. It is also responsible for error detection, correction, and flow control. Information at this layer is called datagrams. Responsible for the routing of data from one node to another through the network including the path selection. Logical addresses are used at this layer. Information maintained at this layer is called packets.
Squatty.com - OSI Cheat Sheet
Security: confidentiality Technology: bridges, switch
Layer 2
Data Link
Protocols: L2F, PPTP, L2TP, PPP, SLIP, ARP, RARP, SLARP, IARP, SNAP, BAP, CHAP, LCP, LZS, MLP, Frame Relay, Annex A, Annex D, HDLC, BPDU, LAPD, ISL, MAC, Ethernet, Token Ring, FDDI
Security: confidentiality Technology: ISDN, Hubs, Repeaters, Cables Layer 1
Physical
Protocols: 10BaseT, 100BaseT, 1000BaseT, 10Base2, 10Base5, OC-3, OC-12, DS1, DS3, E1, E3, ATM, BRI, PRI, X.23
Responsible for translating data into LAN or WAN binary format for proper line transmission. Formats the data frame…puts the correct info into the header. Responsible for the physical addressing of the network via MAC addresses. There are two sublevels to the Data-Link layer. MAC and LLC. The Data-Link layer has error detection, frame ordering, and flow control. Information maintained at this layer is called frames. Responsible for the physical transmission of the binary digits through the physical medium. This layer includes things such as the physical cables, interfaces, and data rate specifications. Information maintained at this layer is called bits (the 1s and 0s). Bits are converted into voltage for transmission.
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (3 of 4)10/7/2005 11:59:27 AM
Squatty.com - OSI Cheat Sheet
Copyright © 2004 Squatty.com
Squatty.com News Feed
file:///C|/Documents and Settings/Administrator/Desktop/TOOLSET/CHEAT SHEETS/Squatty_com - OSI Cheat Sheet.htm (4 of 4)10/7/2005 11:59:27 AM
Powered By GeekLog v1.3.9 Created this page in 0.35 seconds
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