Suggest an editImprove this articleRefine the answer for “What guarantees does TCP provide?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**TCP provides a set of guarantees that make data transmission reliable and predictable for applications.** **Key point:** TCP guarantees that data will arrive correctly, in the right order, and at a suitable speed.Shown above the full answer for quick recall.Answer (EN)Image**TCP provides a set of guarantees that make data transmission reliable and predictable for applications.** More simply: **TCP guarantees that data will arrive correctly, in the right order, and at a suitable speed**. --- ## Main TCP guarantees ### 1. **Delivery guarantee** TCP acknowledges receipt of data: - every segment must be acknowledged (ACK) - if an acknowledgment does not arrive, the segment is sent **again** If a TCP connection ends successfully, the application can be sure that: - the data was **delivered to the receiver** --- ### 2. **Delivery order guarantee** TCP: - numbers segments - on the receiver's side **assembles the data in the correct order** Even if segments arrive: - out of order - with different delays the application receives an **ordered stream of data**. --- ### 3. **No duplicates** TCP: - detects duplicate segments - **does not pass duplicates to the application** The application sees the data **exactly once**. --- ### 4. **Integrity control** TCP checks: - whether the data was corrupted during transmission Corrupted segments: - are treated as undelivered - are requested again --- ### 5. **Flow control** TCP protects the receiver: - it does not send more data than the receiver can accept - it uses a window mechanism This prevents: - buffer overflow - data loss on the receiver's side --- ### 6. **Network congestion control** TCP monitors the state of the network: - it reduces speed under congestion - it increases speed when the network is free This makes the transmission: - stable - fair with respect to other flows --- ### 7. **End-to-end connection** TCP: - establishes a connection before transmission - correctly closes it after the exchange ends This guarantees: - a consistent state on the sender and the receiver --- ## What TCP does NOT guarantee (important) TCP **does not guarantee**: - minimal latency - a constant speed - delivery "by a certain time" If the network is poor: - TCP can slow down significantly - but it will **not sacrifice reliability**For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.