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TCP vs UDP: What Every Network Engineer Should Know!

In this Lesson, we will compare these two transport layer protocols, TCP and UDP. We will compare TCP vs UDP, we will learn what is the difference between TCP and UDP. This comparison is very important in networking world and it is generally a Network Engineering Technical Interview Question. Because, there are critical questions are coming from this lesson on certification exams. . TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two transport layer protocols. What are the differences of UDP and TCP? In this comparison lesson, we will learn the detailed mechanisms of these two protocols. . Which one is reliable, UDP or TCP? Which protocol is fast, TCP or UDP? Which protocol use which security mechanism? What is the main difference of TCP and UDP? We will answer these questions one by one. . TCP (Transmission Control Protocol) is a connection-oriented protocol that ensures reliable communication between devices over a network. It establishes a connection before transmitting data and guarantees the delivery of packets in the correct order, using mechanisms like error-checking, acknowledgments, and retransmissions of lost data. This makes TCP ideal for applications where data integrity and reliability are essential, such as web browsing, file transfers, and emails. However, the added overhead for error correction can make TCP slower compared to other protocols like UDP. . UDP (User Datagram Protocol) is a connectionless protocol that sends data packets without establishing a formal connection or ensuring their delivery. It prioritizes speed over reliability, making it faster than TCP since it doesn't perform error-checking or retransmit lost packets. This makes UDP ideal for real-time applications like video streaming, online gaming, and VoIP calls, where low latency is crucial and occasional data loss is acceptable. While it sacrifices reliability, UDP offers efficient, high-performance communication in scenarios where speed is the primary concern. . 2025 CCNA 200-301 v1.1 Complete Course | TCP Versus UDP . TCP versus UDP: https://ipcisco.com/lesson/tcp-versus... TCP Overview: https://ipcisco.com/lesson/tcp-transm... UDP Overview: https://ipcisco.com/lesson/udp-user-d... . You can also benefit from the below pages for CCNA, CCNP and CCIE! CCNA Courses and Useful Resources For CCNA 200-301 v1.1, CCNP, CCIE are below: . Full CCNA 200-301 v1.1 Course: https://ipcisco.com/course/ccna-certi... . Cisco Configuration Course With Packet Tracer: https://ipcisco.com/course/cisco-pack... . Packet Tracer Lab Files: https://ipcisco.com/cisco-packet-trac... . CCNA Flashcard Questions: https://ipcisco.com/ccna-flashcard-qu... . Network Quizes: https://ipcisco.com/all-quizes/ . #cisco #ccna #networkengineer