Osi Layers
1. Complete the review questions: a. The seventh layer of the OSI model is the Application layer. b. Protocols in the Transport layer accept data from the Session layer and manage end-to-end delivery of data. c. True or False: The IP (Internet Protocol) operates in the Transport layer. False d. True or False: Standards help to ensure interoperability between software and hardware from different manufacturers. True e. True or False: Standards define maximum acceptable performance. False
OSI Layers | Description | Hardware | Protocols | How Built | Physical 7 | Provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects. | cables, cards and physical aspects | Fast Ethernet, RS232, and ATM | Last | Data Link 6 | Data packets are encoded and decoded into bits. | Bridges, Switches, Wireless access points, NICs, Modems, Cable Modems, DSL Modems, Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | L2TP, PPP, PPTP, SLIP | 6th | Network 5 | This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. | Routers, Layer 3 Switches, Firewalls, Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | ARP, ICMP, IGMP, IP, IPSec, RARP | 5th | Transport 4 | Provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control. | Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | TCP, UDP | 4th | Session 3 | establishes, manages and terminates connections between applications. | Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | RTP, SIP | 3rd | Presentation 2 | Formats and encrypts data to be sent across a network, providing freedom from compatibility problems. | Gateways, Proxy Servers, Application Switches, Content Filtering
OSI Layers | Description | Hardware | Protocols | How Built | Physical 7 | Provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects. | cables, cards and physical aspects | Fast Ethernet, RS232, and ATM | Last | Data Link 6 | Data packets are encoded and decoded into bits. | Bridges, Switches, Wireless access points, NICs, Modems, Cable Modems, DSL Modems, Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | L2TP, PPP, PPTP, SLIP | 6th | Network 5 | This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. | Routers, Layer 3 Switches, Firewalls, Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | ARP, ICMP, IGMP, IP, IPSec, RARP | 5th | Transport 4 | Provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control. | Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | TCP, UDP | 4th | Session 3 | establishes, manages and terminates connections between applications. | Gateways, Proxy Servers, Application Switches, Content Filtering Firewalls | RTP, SIP | 3rd | Presentation 2 | Formats and encrypts data to be sent across a network, providing freedom from compatibility problems. | Gateways, Proxy Servers, Application Switches, Content Filtering
References: http://www.sans.org/reading_room/whitepapers/standards/osi-model-overview_543