The OSI Model Flashcards
What is Layer 1 of the OSI model?
Physical
What is Layer 2 of the OSI model?
Data Link
What is Layer 3 of the OSI model?
Network
What is Layer 4 of the OSI model?
Transport
What is Layer 5 of the OSI model?
Session
What is Layer 6 of the OSI model?
Presentation
What is Layer 7 of the OSI model?
Application
Routers operate at which layer of the OSI model?
Layer 3 - Network
Switches operate at which layer of the OSI model?
Layer 2 - Data Link
What is the purpose of the OSI model?
To provide a means of describing how data is transmitted over a network.
What are the six main benefits of the OSI model?
Reduces complexity Standardizes interfaces Facilitates modular engineering Ensures inter-operable technology Accelerates evolution Simplifies teaching and learning
What is the function of Layer 1 of the OSI model?
Binary Transmission:
Defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link.
What is the function of Layer 2 of the OSI model?
Access to Media:
Defines how data is formatted for transmission and how access to the network is controlled.
Provides error detection.
What is the function of Layer 3 of the OSI model?
Data Delivery:
Routes data packets.
Selects best path to deliver data.
Provides logical addressing and path selection.
What is the function of Layer 4 of the OSI model?
End to End Connections:
Handles transportation issues between hosts.
Ensures data transport reliability.
Establishes, maintains, and terminates virtual circuits.
Provides reliability though fault detection and recovery information flow control.
What is the function of Layer 5 of the OSI model?
Inter-host Communication:
Establishes, manages, and terminates sessions between applications.
What is the function of Layer 6 of the OSI model?
Data Representation:
Ensures that data is readable by receiving system.
Formats data.
Structures data.
Negotiates data transfer syntax for application layer.
Provides encryption.
What is the function of Layer 7 of the OSI model?
Network Processes to Applications:
Provides network services to application processes (e.g. email, file transfer, terminal emulation).
Provides user authentication.
Bits are found at what layer of the OSI model?
Layer 1 - Physical
Frames are found at what layer of the OSI model?
Layer 2 - Data Link
Packets are found at what layer of the OSI model?
Layer 3 - Network
Segments are found at what layer of the OSI model?
Layer 4 - Transport
Flow control takes place at which layer of the OSI model?
Layer 4 - Transport
Encryption takes place at which layer of the OSI model?
Layer 6 - Presentation
True or False: The network layer uses physical addresses to route data to destination hosts.
False: The network layer uses logical addresses to route data to destination hosts.
Error detection and recovery takes place at which layer of the OSI model?
Layer 4 - Transport
Which layer of the OSI model establishes, maintains, and terminates communications between applications located on different devices?
Layer 5 - Session
IP is implemented at which OSI model layer?
Layer 3 - Network
Which layer of the OSI model handles the formatting of application data so that it will be readable by the destination system?
Layer 6 - Presentation
Which layer of the OSI model translates between physical and logical addresses?
Layer 3 - Network
What does OSI stand for?
Open Systems Interconnect
Repeaters and hubs operate at which layer of the OSI model?
Layer 2 - Data Link
Bit synchronization is handled at which layer of the OSI model?
Layer 1 - Physical
True or False: most logical addresses are preset in network interface cards at the factory.
False: Physical (MAC) addresses are (except in rare instances) preset at the factory. Logical (IP) addresses are configured by a network administrator.
Bridges operate at which layer of the OSI model?
Layer 2 - Data Link
Which layer of the OSI model is responsible for packet sequencing, acknowledgments, and requests for re-transmission?
Layer 4 - Transport
How many layers are in the OSI model?
7
How many layers are in the TCP/IP model?
4
What is Layer 1 of the TCP/IP model?
Network Access
What is Layer 2 of the TCP/IP model?
Internet
What is Layer 3 of the TCP/IP model?
Transport
What is Layer 4 of the TCP/IP model?
Application
Layer 1 of the TCP/IP model maps to what layer(s) in the OSI model?
Layer 1 - Physical
Layer 2 - Data Link
Layer 2 of the TCP/IP model maps to what layer(s) in the OSI model?
Layer 3 - Network
Layer 3 of the TCP/IP model maps to what layer(s) in the OSI model?
Layer 4 - Transport
Layer 4 of the TCP/IP model maps to what layer(s) in the OSI model?
Layer 5 - Session
Layer 6 - Presentation
Layer 7 - Application
TCP Header is found at what layer of the OSI model?
Layer 4 - Transport
IP Header is found at what layer of the OSI model?
Layer 3 - Network
Ethernet Header is found at what layer of the OSI model?
Layer 2 - Data Link
