Podcast
Questions and Answers
Which layer is responsible for creating communication channels, called sessions, between devices?
Which layer is responsible for creating communication channels, called sessions, between devices?
What is the role of the presentation layer in the OSI model?
What is the role of the presentation layer in the OSI model?
Which protocol operates at the application layer for handling web browsing?
Which protocol operates at the application layer for handling web browsing?
What is the primary function of the transport layer in the OSI model?
What is the primary function of the transport layer in the OSI model?
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Which layer defines how devices should encode, encrypt, and compress data for transmission?
Which layer defines how devices should encode, encrypt, and compress data for transmission?
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What does the session layer do if a data transfer session is interrupted?
What does the session layer do if a data transfer session is interrupted?
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What is the main function of the transport layer?
What is the main function of the transport layer?
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Which layer establishes and terminates a connection between two physically-connected nodes on a network?
Which layer establishes and terminates a connection between two physically-connected nodes on a network?
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What does the network layer use to route packets to a destination node?
What does the network layer use to route packets to a destination node?
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In which layer of the OSI model are segments broken up into network packets?
In which layer of the OSI model are segments broken up into network packets?
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Which model was created by the US Department of Defense and is simpler than the OSI model?
Which model was created by the US Department of Defense and is simpler than the OSI model?
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What is a unique numerical identifier for every device or network that connects to the internet?
What is a unique numerical identifier for every device or network that connects to the internet?
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Which layer of the OSI model focuses on the physical cable or wireless connection between network nodes?
Which layer of the OSI model focuses on the physical cable or wireless connection between network nodes?
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Study Notes
OSI Model
- The OSI model is a reference model from the International Organization for Standardization (ISO) that provides a common basis for the coordination of standards development for the purpose of systems interconnection.
Layers of the OSI Model
- The application layer is used by end-user software such as web browsers and email clients, providing protocols like HTTP, FTP, POP, SMTP, and DNS.
- The presentation layer prepares data for the application layer, defining how to encode, encrypt, and compress data.
- The session layer creates communication channels (sessions) between devices, opening and closing them as needed, and setting checkpoints during data transfer.
- The transport layer takes data, breaks it into segments, and reassembles them on the receiving end, carrying out flow control and error control.
- The network layer breaks up segments into network packets, routes packets using network addresses (like IP addresses), and reassembles them on the receiving end.
- The data link layer establishes connections between physically-connected nodes, breaking up packets into frames and sending them from source to destination.
- The physical layer is responsible for the physical cable or wireless connection, defining the connector, electrical cable or wireless technology, and transmission of raw data.
Advantages of OSI Model
- Helps determine required hardware and software to build a network.
- Helps understand and communicate the process followed by components communicating across a network.
- Aids in troubleshooting by identifying which network layer is causing an issue.
TCP/IP Model
- Is older than the OSI model and was created by the US Department of Defense (DoD).
- Combines OSI layers 5, 6, and 7 into one Application Layer.
- Combines OSI layers 1 and 2 into one Network Access Layer.
IP Addresses
- An Internet Protocol (IP) address is a unique numerical identifier for every device or network that connects to the internet.
- IP addresses can be static (assigned to a device and remaining constant) or dynamic (changing each time a device connects to the internet).
- Class A addresses are for networks with a large number of total hosts.
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Description
Test your knowledge on the different layers of the OSI model, including the application layer which is used by end-user software, and the presentation layer which prepares data for transmission. Explore protocols like HTTP, FTP, POP, SMTP, and DNS.
