Chapter 2 OSI Flashcards
Name all 7 layers of the OSI
physical data link network transport session presentation application
What is Encapsulation?
The process of taking data from the previous layers and passing them onto the next, the reverse of this is DE-capsulation
What is data called while it is on the top 3 layers of the OSI?( session, presentation, application )
DATA
Data is referred to as what on the Transport layer?
Segments
data from transport layer to network layer is now called?
PACKET
From the Network to Data link layer data is turned into what?
FRAME
From the Data link layer to the physical later data is turned into what?
BITS
PHYSICAL LAYER - FIRST!!!!
- deals with all aspects of physically moving data from one computer to the next
- Translates data into 1’s & 0’s
- decides how data is encoded on the media used to transport the data ( coaxial, fiber optic etc )
What devices are typically found on the physical layer?
Hubs, Wires
DATA LINK LAYER - SECOND!!!!!
- moves data from one computer to another
- contains an addressing mechanism for finding the computer or other device on the shared network segment it is trying to communicate with
What devices are typically found on the DATA link layer?
Switches
What protocols are found here?
point to point protocol PPP and the Ethernet protocol
Data link layer is split into two sublayers called?
Logical link control & Media access control
what is the logical link sublayer?
is the creation of the IEEE 802.2 standard, which was created to facilitate communications between the upper network layer and the lower physical layer
What is the Media access control sublayer?
one of the primary functions is to determine which computer has access to the network media at any given time. The “MAC” layer provides access control to the media as it implies. Also is responsible for determining where one frame begins and ends or “frame synchronization”
