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Sybex Network+ Chapter 2
The OSI Model
41
Computer Networking
Professional
04/08/2010

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Term
Name layer 1 of the OSI model.
Definition
Physical
Term
Name layer 2 of the OSI model.
Definition
Data Link
Term
Name Layer 3 of the OSI model.
Definition
Network
Term
Name layer 4 of the OSI model.
Definition
Transport
Term
Name layer 5 of the OSI model.
Definition
Session
Term
Name layer 6 of the OSI model.
Definition
Presentation
Term
Name layer 7 of the OSI model.
Definition
Application
Term
Name the two sub layers of the Data Link level.
Definition
LLC (Logical Link Control) MAC (Media Access Control)
Term
What is the MAC sublayer primarily responsible for?
Definition
Physical addressing and determining the appropriate time and place to put data on a network.
Term
This OSI layer that provides a user interface with the other layers
Definition
Layer 7, Application
Term
This layer of the OSI model is responsible for data translation and code formatting. It is essentially a translator. Also handles encryption.
Definition
Layer 6, Presentation
Term
This layer of the OSI model is responsible to setting up, managing, and tearing down sessions including offering simplex, full duplex and half-duplex communication modes
Definition
Layer 5 Session
Term
This layer of the OSI model segments and reassembles data into a data stream.
Definition
Layer 4, Transport
Term
This layer can be connection-oriented, or connectionless.
Definition
Layer 4, Transport
Term
Define SYN, SYN-ACK, SYN. What is it an example of?
Definition
Synchronize, Synchronize-Acknowledgment, Synchronize.
It is a handshake that describes establishing a connection-oriented session in the Transport layer.
Term
Data integrity is maintained at the Transport layer by maintaining ________ .
Definition
Flow Control
Term
A service is considered connection-oriented if it has the following four things:
Definition
a virtual circuit like a 3 way handshake
sequencing
acknowledgments
flow control
Term
What is important about the size of a window?
Definition
The size of a window equals how much information can be sent from one end to another before an acknowledgment is received.
Term
This layer of the OSI model manages device addressing, tracks device location, and determines the best way to move data
Definition
Layer 3, Network
Term
Name the two types of packets used in the Network layer of the OSI model.
Definition
Data packets, Route-update packets
Term
Which layer of the OSI model provides the physical transmission of data, provides error notification, network topography, and flow control.
Definition
Layer 2, Data Link
Term
Layer that defines when and how packets are placed on the lines.
Definition
Layer 2, Data Link
Term
This identifies Network-layer protocols and encapsulates them.
Definition
LLC
Term
This layer of the OSI model sends and receives bits
Definition
Layer 1, Physical
Term
Hubs and repeaters operate on this layer.
Definition
Layer 1, physical, because they only see bits.
Term
Switches and Bridges operate on this layer.
Definition
Layer 2, Data Link, because they make decisions based on layer 2 addresses.
Term
Routers operate on layer...
Definition
layer 3, because they work with layer 3 addresses. (They can be called a layer 3 switch.)
Term
Workstations work on this layer...
Definition
Layer 7, Application, because they run applications.
Term
Encryption happens at the _______ layer
Definition
Layer 6, Presentation
Term
Layer __________ performs error correction.
Definition
Layer 4, transport.
Term
Layer _________ provides logical addressing.
Definition
Layer 3, Network
Term
Layer _________ performs error detection, but not correction.
Definition
Layer 2, Data Link
Term
Layer that offers simplex, half duplex, or full duplex modes.
Definition
Layer 5, Session
Term
This layer provides reliable or unreliable delivery.
Definition
Layer 4, Transport
Term
TCP is a _____________ and UDP is a ____________ that operate on the ________ level.
Definition
Reliable, unreliable protocols on the Transport layer. Layer 4
Term
Flow control is handled at the ___________ layer.
Definition
Transport, layer 4
Term
What is LLC in charge of?
Definition
Identifying Network layer protocols and encapsulating them.
Term
What sublayer handles logical topography.
Definition
MAC sublayer of the Data Link.
Term
IP is a __________ layer protocol.
Definition
Layer 3, network
Term
Ethernet is a _________ layer protocol.
Definition
Layer 2, Data Link
Term
T1 is a _____________ layer protocol.
Definition
Layer 1, Physical
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