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Order of OSI Layers
Physical
Data Link
Network
Transport
Session
Presentation
Application
What is the Physical Layer?
Responsible for transmission and receipt of the bit stream to/from nodes
Physical Layer Protocols/Devices
Protocols
Ethernet
USB
Bluetooth
Devices
Hub
Repeater
What is the Data Link Layer?
Responsible for providing point-to-point validity of the data
Data Link Layer Protocols/Devices
Protocols
Point to point
Serial Line
ATM
Devices
Switch
Bridge
Wireless AP (WAP)
What is the Network Layer?
Enables internetworking, provides globally unique addressing for every node in the network
Determines routes between source and destination networks
Network Layer Protocols/Devices
Protocols
IP
Address Resolution (ARP)
ICMP (ping)
Devices
Router
Layer 3 Switch
What is the Transport Layer?
Responsible for host-to-hosts integrity of transmission
Detects damaged or lost packets and generates retransmit requests
Transport Layer Protocols/Devices
Protocols and Devices
TCP/UDP
What is the Session Layer?
Establishes, maintains, and terminates host-to-host interactive sessions
Used to uniquely identify a service application, or function on a host via ports
Session Layer Protocols/Devices
Protocols
NFS
RFC
SQL
NetBIOS
What is the Presentation Layer?
Responsible for managing the way data is presented
Presentation Layer Protocols/Devices
Protocols
ASCII
SSL
JEPG
GIF
IMAP
What is the Application Layer?
Provides the interface between users applications and network’s services
Application Layer Protocols/Devices
Protocols
HTTP
DNS
Device
User Application
What Layers fall under Network Access?
Physical
Data link
What Layers fall under Internet?
Network
What Layers fall under Transport?
Transport
What Layers fall under Application?
Session
Presentation
Application
Physical Layer Data Type
Bits
Data Link Layer Data Type
Frames
Network Layer Data Type
Packets
Transport Layer Data Type
Segments