Osi Layers

Topics: OSI model, Transmission Control Protocol, Session Layer Pages: 2 (353 words) Published: July 2, 2013
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 Firewalls|...


References: http://www.sans.org/reading_room/whitepapers/standards/osi-model-overview_543
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