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Comptia Network+ OSI Model Pt1
Network+ Certification Prep
44
Computer Networking
Professional
09/14/2008

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Term
What is the top or last layer in the OSI model
Definition
Layer 7 - Application Layer
Term
What is Layer 6 in the OSI model?
Definition
Presentation Layer
Term
What is Layer 5 in the OSI model
Definition
Session Layer
Term
What is layer 5 in the OSI model
Definition
Transport
Term
What is layer 3 in the OSI model
Definition
Network Layer
Term
What is layer 2 in the OSI model
Definition
Data-link
Term
What is layer 1 in the OSI model
Definition
Physical
Term
This layer's charteristics are:

type of media used (such as cable, connector, pinout); identifies topology to be used (such as ring, mesh, star & bus); defines voltage on media & frequency at which signals that carry the data move from one state to another dictating speed, bandwidth & max distance media can be used.
Definition
Layer 1 - Physical
Term
This layer is responsible for getting data to physical layer. Also responsible for error detection, error correction and hardware addressing.
Definition
Data-Link Layer.
Term
The term frame is used to describe the logical grouping of data at this layer?
Definition
Data-Link
Term
What are the 2 sublayers of the Data-link layer?
Definition
MAC & LLC
Term
This sublayer controls access to network media & defines the physical address
Definition
MAC layer
Term
This sublayer is is specified in 802.2 & responsible for error and flow conrol mechanisms
Definition
LLC Layer
Term
The primary responsibility of this layer is routing.
Definition
Network Layer
Term
This layer does not specify how data is passed but rather provides the mechanisms to do so.
Definition
Network Layer
Term
Protocols at this layer are responsible for route selection
Definition
Network Layer
Term
The term packet is used to describe the logical grouping of data at this layer.
Definition
data-link layer
Term
This layer provides mechanisms to move data between network devices
Definition
Transport layer
Term
What are the 3 ways layer 4 uses to move data between network devices
Definition
The transport layer uses error checking, service addressing & segmentation.
Term
The transport layer makes sure that data is passed to the right service at the upper layers of the OSI model. What is this referred to as?
Definition
Service addressing
Term
blocks of data need to be broken down in layer 4 for the lower layers to handle. What is this process called?
Definition
segmentation
Term
protocols that operate at this layer can be either connectionless or connection oriented
Definition
transport layer
Term
This layer is responsible for flow control
Definition
transport layer
Term
This refers to the way in which the receiving device can accept data transmissions
Definition
flow control
Term
What are the 2 common methods of flow control used
Definition
buffering & windowing
Term
When this is used, data is temporarily stored & waits for the destination device to become available.
Definition
transport layer buffering flow control
Term
In this environment, data is sent in groups of segments that require only 1 acknowledgment
Definition
Transport layer flow control windowing
Term
This layer is responsible for managing & controlling the synchronization of data between applications on 2 devices
Definition
session layer
Term
This layer establishes, maintains and breaks sessions
Definition
session layer
Term
The transport layer is responsible for setting up & maintaining connections on between 2 nodes, this layer performs the same function on behalf of the application
Definition
session layer
Term
The basic function of this layer is to convert the data intended for or received from the application layer into another format.
Definition
Presentation Layer
Term
commmon data formats converted by this layer include graphics files, text & data.
Definition
Presentation layer
Term
This layer handles encryption and decryption
Definition
presentation layer
Term
this layer takes requests and data from users and pass them on.
Definition
Application layer
Term
some basic services of this layer include file & print
Definition
application layer
Term
This layer defines the physical structure of the network and the topology.
Definition
Physical (level 1)
Term
This layer provies error detection and correction. Uses 2 sub layers. Identifies methods by which media is accessed. Defines hardware addressing
Definition
Data-Link (layer 2)
Term
This layer handles discovery of destination systems and addressing. Provides mechanism by which data can be passed from one network system to another.
Definition
network (layer 3)
Term
This layer provides connection services between the sending and receiving devices and ensures reliable data delivery. Manages flow control through buffering or windowing. Provides segmentation, error checking and service identification.
Definition
transport layer
Term
This layer synchronizes the data exchange between applications on separate devices
Definition
session layer
Term
This layer translates data from applications to a format that can be transmitted across the network. Handles encryption & decryption of data. Provides compression and decompression.
Definition
Presentation layer
Term
Provides access to the network for software programs
Definition
application layer
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