65 terms

OSI Reference Model

This quizlet reviews the various layers of both the OSI Reference Model and The TCT/IP DoD model comparing each different layer
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This OSI Reference Model layer integrates network functionality into the host operating system, and enables network services. This layer does not include specific applications that provide services, but rather provides the capability for services to operate on the network
Application
This OSI Reference Model layer ensures formatting and translation of data between systems
Presentation
This OSI Reference Model layer integrates network functionality into the host operating system, and enables network services. This layer does not include specific applications that provide services, but rather provides the capability for services to operate on the network
Layer 7
Three services typically associated with the Application layer
HTTP FTP Telnet
HTTP operates at which layer of the OSI Reference Model Layer 1
Layer 1
Which OSI Reference layer formats or "presents" data into a compatible form for receipt by the Application layer or the destination system
Presentation
The OSI Reference Model layer's primary function is managing the sessions in which data is transferred
Session
The OSI Reference Model layer provides a transition between the upper and lower layers of the OSI model, making the upper and lower layers transparent from each other
Transport
Presentation
This OSI Reference Model layer ensures negotiation of data transfer syntax between systems, through converting character sets to the correct format
Data at the Network layer is referred to as
Packet
Data at the transport layer is referred to as
Segment
Data at the data link layer is referred to as
Frame
This OSI Reference Model layer ensures encapsulation of data into message envelopes by encryption and compression
Presentation
This OSI Reference Model layer describes how data is routed across networks and on to the destination
Network
One data link layer function
How hosts on the network are identified (physical or MAC address).
Second data link layer function
How and when devices can transmit on the network medium (media access control and (logical topology).
Third data link layer function
How to verify that the data received from the Physical layer is error free (parity and CRC).
Fourth data link layer function
How devices control the rate of data transmissions between hosts (flow control).
This layer of the OSI model sets standards for sending and receiving electrical signals between devices
Physical
This OSI Reference Model layer defines the rules and procedures for hosts as they access the Physical layer.
Data link
What are the two sub layers of the data link layer
MAC and LLC
Layer 1 of the OSI Reference Model is
Physical
Layer 3 of the OSI Reference Model is
Network
Layer 7 of the OSI Reference Model is
Application
Layer 4 of the OSI Reference Model is
Transport
Layer 2 of the OSI Reference Model is
Data link
Layer 6 of the OSI Reference Model is
Presentation
Layer 5 of the OSI Reference Model is
Session
The presentation layer is layer
Six
Layer six of the OSI Reference Model ensures
Restoration of data by decryption and decompression
Protocols at the Physical layer identify
How digital data (bits) are converted to electric pulses, radio waves, or pulses of lights
Assignment of the session ID number to each session to keep data streams separate occurs at which layer of the OSI Reference Model
Session
Maintaining a list of known networks and neighboring routers occurs at which layer of the OSI Reference Model
Network
The OSI Reference Model layer that defines specifications for cables and connectors
Physical
The physical topology is a function at
The physical layer of the OSI Reference Model
One function that occur at layer 5 of the OSI Reference model
Set up, maintain, and tear down communication sessions
A second function that occur at layer 5 of the OSI Reference model
Assignment of the session ID number to each session to keep data streams separate.
How hosts on the network are identified (physical or MAC address) occurs at which layer of the OSI Reference Model
Data link
In what way is the data link layer different from the network layer with respect to network addressing
With the data link layer hosts on the network are identified by physical or MAC address while at the network layer hosts and networks use logical addresses such as 10.15.24.5 (IP)
Management of multiple sessions (each client connection is called a session) where a server can concurrently maintain thousands of sessions occurs at which layer of the OSI Model
Session
Assignment of the session ID number to each session to keep data streams separate occurs at which layer of the OSI Model
Session
Set up, maintain, and tear down communication sessions occurs at which layer of the OSI Model
session
End - to - end flow control occurs at which layer of the OSI Reference Model
Transport
Port and socket numbers are managed at which layer of the OSI Reference Model
Transport
Segmentation, sequencing, and combinatio occur at which layer of the OSI Model
Transport
Connection services, either reliable (connection-oriented) or unreliable (connectionless) delivery of data occues at which layer of the OSI Model
Transport
Determining the next network point to which data should be sent. Routers use a routing protocol to take into account various factors such as the number of hops in the path, link speed, and link reliability to select the optimal path for data
Describes a layer 3 function
Connection services, either reliable (connection-oriented) or unreliable (connectionless) delivery of data occur at which layer of the OSI Reference Model
Layer 4
Segmentation, sequencing, and combination occur at which layer of the OSI Reference
Transport
Transport delivery services can be either connection oriented or connectionless oriented
True
One function that occurs at the data link
How hosts on the network are identified (physical or MAC address).
A second function that occurs at the data link
How and when devices can transmit on the network medium (media access control and logical topology).
A third function that occurs at the data link
How to verify that the data received from the Physical layer is error free (parity and CRC).
A fourth function that occurs at the data link
How devices control the rate of data transmissions between hosts (flow control).
How hosts on the network are identified (physical or MAC address) is similar to the logical addressing function of this OSI Reference Model layer
Network
Not a function of the physical layer in the OSI Reference Model
How devices control the rate of data transmissions between hosts (flow control)
What TCP/IP model layer corresponds to the Session, Presentation, and Application layers of the OSI model? Protocols associated with this layer include FTP, HTTP, Telnet, SMTP, DNS, and SNMP.
Application
What TCP/IP model layer is comparable to the Transport layer of the OSI model and is responsible for error checking and reliable packet delivery. Here, the data stream is broken into segments that must be assigned sequence numbers so that the segments can be reassembled correctly on the remote side after they are transported. Protocols associated with this layer include Transport Control Protocol (TCP) and User-Datagram Protocol (UDP).
Host - to - host
What TCP/IP model layer is comparable to the Network layer of the OSI model? It is responsible for moving packets through a network. This involves addressing of hosts and making routing decisions to identify how the packet traverses the network. Protocols associated with this layer include Address Resolution Protocol (ARP), Internet Control Message Protocol (ICMP), and Internet Group Management Protocol (IGMP).
Internet
Network access
What TCP/IP model layer corresponds to the functions of the Physical and Data Link layers of the OSI model? It is responsible for describing the physical layout of the network and how messages are formatted on the transmission medium.
Hubs and repeaters work at which layer of the OSI Reference Model
Physical
Logical addressing such as an IP address operates at which layer of the OSI Reference Model
Network
A Physical address is also known as an Ethernet or hardware address. An example is FB-24-EC-A8-34-BB (12 digit hex number or 48-bit binary number). AT which layer of the OSI Reference Model would MAC address be found at
Data link
Routing protocols such as RIP and interior gateway protocol operate at
The network layer
TCP and UDP typically are ______________ layer protocols
Transport
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