Podcast
Questions and Answers
Which layer of the OSI model does the application layer sit on top of?
Which layer of the OSI model does the application layer sit on top of?
- Network
- Data link
- Transport (correct)
- Physical
What type of data transfer is used by UDP?
What type of data transfer is used by UDP?
- Reliable, ordered
- Reliable, unordered
- Unreliable, ordered
- Unreliable, unordered (correct)
What type of issue must be taken into account when designing a system that uses UDP?
What type of issue must be taken into account when designing a system that uses UDP?
- Network latency
- Network congestion (correct)
- Network security
- Network reliability
Flashcards
Layer above Application in OSI model?
Layer above Application in OSI model?
The Application layer sits on top of the Transport layer in the OSI model.
UDP data transfer type?
UDP data transfer type?
UDP uses unreliable, unordered data transfer. This means packets may be lost or arrive out of order.
Issue with UDP system design?
Issue with UDP system design?
Network congestion must be taken into account when designing a system that uses UDP because UDP does not have built-in congestion control mechanisms.
Study Notes
- The application layer is an abstraction layer that sits on top of the transport layer.
- Application layer protocols use the underlying transport layer protocols to establish host-to-host connections.
- For example, World-Wide-Web servers operate on port 80, and email relay servers usually listen on port 25.
- TCP is used for reliable, ordered data transfers, while UDP is used for less reliable, unordered data transfers.
- UDP lacks built-in network congestion avoidance, and so must be carefully designed to prevent network collapse.
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