OSI Layer 4 Class Questions

TCP/IP is the standard protocol for communicating across the internet. TCP (Transmission Control Protocol) is responsible for establishing a connection between devices and ensuring reliable data transmission, while IP (Internet Protocol) handles the addressing and routing of data packets. Together, TCP/IP provides a robust and efficient method for sending and receiving data over the internet. UDP/DP, HDP/IT, UDHP, and PDH3.3 are not valid protocols for internet communication.

TCP (Transmission Control Protocol) is the correct answer because it is one of the most widely used protocols in the transportation layer of the internet protocol suite. TCP provides reliable, connection-oriented communication between devices by ensuring that data is delivered in the correct order and without errors. It is commonly used for applications that require a high level of reliability, such as web browsing, email, file transfer, and remote access. UDP (User Datagram Protocol) is another protocol in the transportation layer, but it is used more for applications that prioritize speed and efficiency over reliability, such as streaming media and online gaming.

UDP stands for User Datagram Protocol. It is a communication protocol that operates at the transport layer of the Internet Protocol Suite. UDP is a connectionless protocol that does not guarantee delivery or order of packets. It is commonly used for applications that require low latency and can tolerate some packet loss, such as real-time streaming and online gaming. The lowercase "user datagram protocol" is also a valid way to refer to UDP.

UDP is preferred over TCP when there is a need to send information quickly without the requirement of receiving all the information. UDP is faster because it does not have the additional overhead of error checking and retransmission of lost packets, which TCP has. This makes UDP a suitable choice for applications such as streaming media or real-time communication, where speed is prioritized over reliability.

UDP does not use a checksum to find errors that were sent and TCP does. This means that UDP sacrifices error detection and correction mechanisms in favor of speed. By not performing error checking, UDP can transmit data more quickly, resulting in faster communication compared to TCP.

UDP (User Datagram Protocol) would be the most likely protocol used for streaming multimedia on a network. Unlike TCP, which ensures reliable and ordered delivery of data, UDP is a connectionless protocol that prioritizes speed and efficiency. Streaming multimedia often involves real-time data transmission, where a small delay in delivery is acceptable. UDP's lightweight nature and low overhead make it ideal for this purpose, as it allows for faster transmission and reduces the risk of buffering or lag.

UDP (User Datagram Protocol) is more speed efficient when sending many packets to many different destinations. Unlike TCP (Transmission Control Protocol), UDP does not establish a connection before transmitting data and does not provide error checking or retransmission of lost packets. This lack of overhead allows UDP to transmit data faster, making it more suitable for applications such as real-time streaming, online gaming, and VoIP, where speed and low latency are crucial. However, it is important to note that UDP sacrifices reliability for speed, as there is no guarantee that all packets will reach their destination.

The correct answer is "No, only on the TCP protocol." This means that there is no need for a checksum header on both protocols. The header with a checksum is only required on the TCP protocol.

UDP (User Datagram Protocol) depends on IP (Internet Protocol) to move packets around the network on its behalf. IP is responsible for addressing and routing packets across different networks, ensuring that they reach their intended destination. UDP uses IP to encapsulate its data into packets and relies on IP to deliver these packets to the correct destination based on the IP addresses of the source and destination devices. IP provides the necessary network layer services for UDP communication.

When a corrupted file is sent through UDP and received, it is deleted and you never see it. Unlike TCP, which ensures reliable data transmission by detecting and retransmitting corrupted or lost packets, UDP does not have error detection or correction mechanisms. Therefore, if a file sent via UDP is corrupted, it will not be delivered to the recipient and will be discarded.

UDP does use checksums to ensure the integrity of data during transmission. However, unlike TCP which requests re-transmission of corrupted data, UDP simply discards the corrupted files.