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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Adjacent-Layer Interaction |
The general topic of how on one computer, two adjacent layers in the networking architectural model work together, with the lower layer providing services to the higher level. |
Adjacent-layer interaction on the same computer
On a single computer, one layer provides a service to a higher layer. The software or hardware that implements the higher layer requests that the next lower layer perform the needed function. (Wendell, 2013 p.26) |
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Deencapsulation
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On a computer that receives data over a network, the process in which the device interprets the lower-layer headers and, when finished with each header, removes the header, revealing the next-higher layer PDU.
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(Wendell, 2013 p.)
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encapsulation
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The placement of data from a higher-layer protocol behind the header (and in some cases, between a header and trailer) of the next-lower-layer protocol. For example, an IP packet could be encapsulated in an Ethernet header and trailer before being sent over an Ethernet.
(Wendell, 2013 p. glossary) |
reders to the proces of putting headers (and sometimes data around trailers) around some data.
(Wendell, 2013 p.32) |
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frame
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A term referring to a data link header and trailer, plus the data encapsulated between the header and trailer.
(Wendell, 2013 p. glossary) |
Example for frame locate in
(Wendell, 2013 p.31) |
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networking model
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A generic term referring to any set of protocols and standards collected into a comprehensive grouping that, when followed by the devices in a network, allows all the devices to communicate.
(Wendell, 2013 p. glossary) |
Examples include TCP/IP and OSI
A network model, sometimes also called either a networking architecture, or a networking blueprint, refers to a comprehensive set documents. Individually, each document describes one small function required for a network to work. (Wendell, 2013 p.19) |
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packet
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A logical Grouping of bytes that include the network layer header and encapsulated data, but specifically does not include any headers and trailers below the network.
(Wendell, 2013 p. glossary) |
Example for packet locate in
(Wendell, 2013 p.) |
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PDU
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Protocol Data unit
A generic term referring to the header defined by some layer of a networking model, and the data encapsulated by the header (and possibly trailer) of that layer, but specifically not including any lower-layer headers and trailers. (Wendell, 2013 p. glossary) |
The TCP/IP model uses terms such as segment, packet, and frame to refer to carious layers and their respective encapsulated data (refer to Figure 1-13). OSI uses a more generic term protocol data unit (PDU).
(Wendell, 2013 p.38) |
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same-layer interaction
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The communication between two networking devices for the purpose of a networking model, with that communication happening by using a header defined by that layer in the model. The two devices set values in the header, sen the receiving device(s) interpreting the header to decide what action to take.
(Wendell, 2013 p. glossary) |
Same layer interaction on different computers
The two computers use a protocol (an agreed-to-set of rules) to communicate with the same layer on another computer. The protocol defined by each layer uses a header that is transmitted between the computers to communicate what each computer wants to do. Header information added by a layer of the sending computer is processed by the same layer of the receiving computer. (Wendell, 2013 p.26) |
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segment
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In TCP, a term used to describe a TCP header and its encapsulated data (also called an L4DU). Also in TCP, the process of accepting a large chunck of dat from the application layer and breaking into smaller pieces that fit into TCP segments. In Ethernet , a segment is either a single Ethernet cable or a single collusion domain(no matter how many cables are used), |
Example for segment located on
(Wendell, 2013 p.25-26) |
