It operates with data in the form of bits that are sent from the Physical layer of the sending (source) device and received at the Physical layer of the destination device. Ethernet cabling, Token Ring network technology and SCSI all function at the Physical layer of the OSI model.
compnetworking.about.com/od/basicnetworkingconcepts/l/b... compnetworking.about.com/od/basicnetworkingconcepts/l/blbasics_osi1.htm
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802.2 Logical Link Control (LLC) Allows Network layer protocols to link to Physical layer and MAC sublayer protocols ... The MAC sublayer carries the physical address of each device on the network. This address is more commonly called a device's MAC address. The MAC address is a 48-bit ... Data encapsulation by OSI Layer:
www.defoenet.com/ccna/osi_l2.html www.defoenet.com/ccna/osi_l2.html
OSI model - Wikipedia, the free encyclopedia
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The Open System Interconnection Reference Model (OSI Reference Model or OSI Model ) is an abstract description for layered communications and computer network protocol design. It was developed as ...
en.wikipedia.org/wiki/OSI_model
Data Link Layer - Wikipedia, the free encyclopedia
The Data Link Layer is Layer 2 of the seven-layer OSI model of computer networking. It corresponds to or is part of the link layer of the TCP/IP reference model. The Data Link Layer is the protocol ...
en.wikipedia.org/wiki/Data_Link_Layer
Devices in this layer copy frames or data from one network to another, depending upon the device in operation like a Hub or a Repeater. This layer basically deals with the network components that you can touch. Any device or protocol that operates at the Physical Layer deals with the physical components of the network.
www.boloji.com/computing/networking/n004.htm
OSI Layer; Layer 2 Switches (The Data-Link Layer) ; Layer 2 switches operate using physical network addresses. Physical addresses, also known as link-layer, hardware, or MAC-layer addresses, identify individual devices.
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The Physical layer is Layer One of the OSI model, and this is where troubleshooting should always start. Is the device on? Is it properly connected? If everything is fine at Layer One, you just move up to Layer Two, and continue in this structured fashion until the problem is identified.
gocertify.com/article/ccna-tutorial-osi-physical-layer.... gocertify.com/article/ccna-tutorial-osi-physical-layer.shtml
A hub is a layer 1 (physical) device because it does not use any part of the packet header to direct the packet to the right destination, it just broadcasts to all connected computers.
http://wiki.answers.com/Q/Why_Hub_comes_on_Physical_Lay...
OSI Layer Services ... OSI Model Physical Layer ... The lower layers of the OSI model handle data transport issues. The physical layer and the data link layer are implemented in hardware and software.
www.cisco.com/en/US/docs/internetworking/technology/han... www.cisco.com/en/US/docs/internetworking/technology/handbook/Intro-to-Internet.html
Within the OSI model, the Data Link layer was split into two, the Media Access Control (MAC) sub-layer and the 802.2 Logical Link Control (LLC) sub-layer. ... Once it decodes the bit stream, the physical layer notifies the data link layer that a frame has been received and passes it up. Examples of specifications include:
www.rhyshaden.com/osi.htm www.rhyshaden.com/osi.htm
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