Questions and Answers
What is the primary responsibility of the transport layer in computer networking?
Providing logical communication between application processes on different hosts
Which protocol operates in a connection-oriented and reliable manner at the transport layer?
TCP
What are the main functionalities of the transport layer?
Multiplexing/demultiplexing, reliable data transfer, flow control, and congestion control
Which type of transport layer protocol is UDP?
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What is the primary function of the network layer in computer networking?
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What is the main difference between connection-oriented and connectionless protocols?
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Which feature is specific to TCP and not available in UDP?
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What is the purpose of multiplexing at the sender's side?
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Which type of protocol uses a handshake process to establish a connection between devices?
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What is the main difference between TCP and UDP in terms of data transfer?
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The transport layer is responsible for data transfer between hosts.
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TCP is a connectionless and unreliable transport protocol.
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Multiplexing and demultiplexing are functionalities of the transport layer.
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The network layer is responsible for reliable data transfer and flow control.
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UDP is a connection-oriented reliable transport protocol.
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Connection-oriented protocols transmit segments to the receiver in the same order the sender has sent them.
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Connectionless protocols establish a dedicated connection between devices before transmitting data.
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UDP provides reliable data transfer.
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Multiplexing at the sender's side involves collecting messages from multiple sockets and adding transport headers to be used later in demultiplexing.
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TCP and UDP both provide determined delay guarantees and security of data transfer.
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Study Notes
Transport Layer Responsibilities
- The primary responsibility of the transport layer is to ensure reliable data transfer between hosts.
Transport Layer Protocols
- TCP (Transmission Control Protocol) operates in a connection-oriented and reliable manner at the transport layer.
- UDP (User Datagram Protocol) is a connectionless transport protocol.
Transport Layer Functionalities
- The main functionalities of the transport layer include multiplexing and demultiplexing.
Connection-Oriented vs Connectionless Protocols
- Connection-oriented protocols transmit segments to the receiver in the same order the sender has sent them, ensuring reliability and order.
- Connectionless protocols do not establish a dedicated connection before transmitting data, and do not guarantee the order of segment receipt.
TCP Specific Features
- TCP uses a handshake process to establish a connection between devices.
- TCP provides reliable data transfer, a feature not available in UDP.
Multiplexing Purpose
- The purpose of multiplexing at the sender's side is to collect messages from multiple sockets and add transport headers to be used later in demultiplexing.
TCP vs UDP
- The main difference between TCP and UDP in terms of data transfer is that TCP is connection-oriented and reliable, while UDP is connectionless and unreliable.
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