Osi Layers (Detailed)

Front 1

* Voltage levels and timings of voltage changes.
* Physical data rates and maximum transmission distances
* Physical Connectors.

Back 1

Physical Layer (Layer 1)

Front 2

Specifies the topology or layout of the transmission media.

Back 2

Physical Layer (Layer 1)

Front 3

* Network Interface Cards (NIC)
* Transceivers
* Repeaters
* Hubs
* Multi Station Access Units (MAU’s)

Back 3

Physical Layer (Layer 1)

Front 4

* LAN specifications and
* WAN specifications

Back 4

Physical Layer (Layer 1)

Front 5

The protocol layer which transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network segment.

Back 5

Data Link Layer (Layer 2)

Front 6

Provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the Physical Layer.

Back 6

Data Link Layer (Layer 2)

Front 7

Concerned with local delivery of frames between devices on the same LAN.

Back 7

Data Link Layer (Layer 2)

Front 8

Specifies how devices detect and recover from collisions, but it does not prevent them from happening.

Back 8

Data Link Layer (Layer 2)

Front 9

This layer conveys the bit stream electrical impulse, light or radio signal through the network at the electrical and mechanical level.

Back 9

Physical Layer (Layer 1)

Front 10

Provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects.

Back 10

Physical Layer (Layer 1)

Front 11

Fast Ethernet, RS232, and ATM are protocols within this layer's components.

Back 11

Physical Layer (Layer 1)

Front 12

At this layer, data packets are encoded and decoded into bits.

Back 12

Data Link Layer (Layer 2)

Front 13

Furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization.

Back 13

Data Link Layer (Layer 2)

Front 14

This layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer.

Back 14

Data Link Layer (Layer 2)

Front 15

This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node.

Back 15

Network Layer (Layer 3)

Front 16

Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing.

Back 16

Network Layer (Layer 3)

Front 17

Responds to service requests from the Transport Layer and issues service requests to the Data Link Layer.

Back 17

Network Layer (Layer 3)

Front 18

Host addressing
Message forwarding

Back 18

Network Layer (Layer 3)

Front 19

Maintains logical addresses such as IP addresses for devices on the network.

Back 19

Network Layer (Layer 3)

Front 20

This layer provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control.

Back 20

Transportation Layer (Layer 4)

Front 21

Ensures complete data transfer.

Back 21

Transportation Layer (Layer 4)

Front 22

Responsible for delivering data to the appropriate application process on the host computers.

Back 22

Transportation Layer (Layer 4)

Front 23

Provides the necessary functions to enable communication between software application processes on different computers.

Back 23

Transportation Layer (Layer 4)

Front 24

Responsible for end-to-end or host-to-host transport.

Back 24

Transportation Layer (Layer 4)

Front 25

Responsible for defining the means by which potentially large amounts of application data are divided into smaller blocks for transmission.

Back 25

Transportation Layer (Layer 4)

Front 26

Provides connection services for the protocols and applications that run at the levels above it. These can be categorized as either connection-oriented services or connectionless services.

Back 26

Transportation Layer (Layer 4)

Front 27

This layer establishes, manages and terminates connections between applications.

Back 27

Session Layer (Layer 5)

Front 28

Sets up, coordinates, and terminates conversations, exchanges, and dialogues between the applications at each end.

Back 28

Session Layer (Layer 5)

Front 29

Provides the higher layer protocols through command sets often called application program interfaces or APIs.

Back 29

Session Layer (Layer 5)

Front 30

This layer provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa.

Back 30

Presentation Layer (Layer 6)

Front 31

Works to transform data into the form that the application layer can accept.

Back 31

Presentation Layer (Layer 6)

Front 32

This layer formats and encrypts data to be sent across a network, providing freedom from compatibility problems.

Back 32

Presentation Layer (Layer 6)

Front 33

Sometimes called the syntax layer.

Back 33

Presentation Layer (Layer 6)

Front 34

In this layer all different formats from all sources are made into a common uniform format that the rest of the OSI model can understand.

Back 34

Presentation Layer (Layer 6)

Front 35

Responsible for protocol conversion, character conversion,data encryption / decryption, expanding graphics commands, data compression.

Back 35

Presentation Layer (Layer 6)

Front 36

Sets standards for different systems to provide seamless communication from multiple protocol stacks.

Back 36

Presentation Layer (Layer 6)

Front 37

Not always implemented in a network protocol.

Back 37

Presentation Layer (Layer 6)

Front 38

Takes the data provided by the Application layer and converts it into a standard format that the other layers can understand.

Back 38

Presentation Layer (Layer 6)

Front 39

This layer supports application and end-user processes.

Back 39

Application Layer (Layer 7)

Front 40

Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified.

Back 40

Application Layer (Layer 7)

Front 41

Everything at this layer is application-specific.

Back 41

Application Layer (Layer 7)

Front 42

This layer provides application services for file transfers, e-mail, and other network software services.

Back 42

Application Layer (Layer 7)

Front 43

Telnet and FTP are applications that exist entirely in this layer.

Back 43

Application Layer (Layer 7)

Front 44

Protocols:
DNS; FTP; TFTP; BOOTP; SNMP;RLOGIN; SMTP; MIME; NFS; FINGER; TELNET; NCP; APPC; AFP; SMB

Back 44

Application Layer (Layer 7)

Front 45

Network Components:
Gateway

Back 45

Application Layer (Layer 7)

Front 46

Protocols:
IEEE 802
IEEE 802.2
ISO 2110
ISDN

Back 46

Physical Layer (Layer 1)

Front 47

Network Components:
Gateway
Redirector

Back 47

Presentation Layer (Layer 6)

Front 48

Protocols:
NetBIOS
Names Pipes
Mail Slots
RPC

Back 48

Session Layer (Layer 5)

Front 49

Network Components:
Repeater
Multiplexer
Hubs
* Passive
* Active
TDR
Oscilloscope
Amplifier

Back 49

Physical Layer (Layer 1)

Front 50

Protocols:
TCP, ARP, RARP;
SPX
NWLink
NetBIOS / NetBEUI
ATP

Back 50

Transportation Layer (Layer 4)

Front 51

Network Components:
Gateway
Advanced Cable Tester
Brouter

Back 51

Transportation Layer (Layer 4)

Front 52

Protocols:
IP, ARP, RARP, ICMP, RIP, OSFP, IGMP, IPX, NWLink, NetBEUI, OSI, DDP, DECnet

Back 52

Network Layer (Layer 3)

Front 53

Network Components:
Brouter
Router
Frame Relay Device
ATM Switch
Advanced Cable Tester

Back 53

Network Layer (Layer 3)

Front 54

* communicates with the adapter card
* controls the type of media being used:
802.3 CSMA/CD (Ethernet)
802.4 Token Bus (ARCnet)
802.5 Token Ring
802.12 Demand Priority

Back 54

Media Access Control (SubLayer of Data Link Layer {Layer 2})

Front 55

* error correction and flow control
* manages link control and defines SAPs
802.1 OSI Model
802.2 Logical Link Control

Back 55

Logical Link Control (SubLayer of Data Link Layer {Layer 2})