Say it like this
- We're using TCP for this connection to guarantee delivery.
- TCP ensures that packets arrive in order and without loss.
- The protocol stack uses TCP at the transport layer.
Use it at work
Networking
- TCP makes sure all packets arrive in order.
- The service listens on TCP port 5432.
Debugging
- There are lots of TCP connection resets.
- Check the TCP timeout settings.
In an interview
- What's the difference between TCP and UDP?
- Explain the TCP handshake.
Don't say this
TCP is a protocol, not a verb. You do not TCP something; you use TCP to transmit something.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| TCP | Reliable, ordered delivery | Network engineers | Web, databases |
| UDP | Fast, no delivery guarantee | Network engineers | Video, games |
Practice
Try it
4 quick exercises
1. Your manager asks which protocol ensures no data loss. What do you say?
2. We chose _______ over UDP because we cannot afford to lose any customer payment records.
3. Which sentence uses TCP incorrectly?
4. Rewrite this in natural tech English: 'We must select a protocol that makes sure packets come in the right order and do not get lost.'
Say it out loud
Phrase 1 of 3
"We're using TCP for this connection to guarantee delivery."
We don't save your recording. The word check uses your browser's speech recognition.
More about TCP
Real examples(3)
- in a standup
"We implemented TCP retransmission logic to handle packet loss on unstable networks."
- in a code review
"This service must use TCP, not UDP, because we can't afford to lose payment transaction data."
- in a team meeting
"TCP has higher overhead than UDP, so we need to decide if reliability or throughput is the priority here."
More mistakes(2)
Handle with care. TCP is often confused with UDP; people sometimes use TCP when they mean any network protocol. TCP is specifically for reliable, ordered delivery.
- ✕TCP and UDP do the same thing; TCP is just older.✓TCP guarantees reliable delivery and ordering, while UDP prioritizes speed with no guarantee of delivery.
TCP and UDP serve different purposes. TCP is not simply an older version of UDP.
- ✕We should use TCP because it is always better.✓We should use TCP for applications where reliability is critical, and UDP for real-time applications where speed matters more.
TCP is not universally better; the choice depends on the use case.
Other forms(2)
- TCP noun
"TCP is the protocol we rely on for web browsing."
- TCP (used as modifier) adjective
"The TCP connection was established after the three-way handshake."
Often used with(5)
- TCP/IP · The combined protocol suite; TCP handles transport layer, IP handles routing.
- TCP connection · A reliable communication channel established between two devices.
- TCP port · A specific endpoint on a device identified by a number (e.g., port 80 for HTTP).
- TCP handshake · The three-step process (SYN, SYN-ACK, ACK) that establishes a TCP connection.
- TCP timeout · The wait period before TCP considers a connection lost and retransmits data.
Similar words(1)
- Transmission Control Protocol · The full formal name; used in documentation and formal settings.
Opposites(2)
- UDP (User Datagram Protocol)
- QUIC (Quick UDP Internet Connections)
Questions(5)
- What does TCP stand for?
- TCP stands for Transmission Control Protocol. It is one of the main protocols used for internet communication, responsible for the reliable delivery of data packets between computers.
- How does TCP differ from UDP?
- TCP guarantees reliable, ordered delivery of data with error checking and retransmission of lost packets. UDP sends data faster but does not guarantee delivery or ordering. Use TCP when reliability is critical (email, file transfer, web browsing) and UDP when speed matters more (video streaming, online gaming).
- What is a TCP connection?
- A TCP connection is an established communication channel between two devices. It begins with a three-way handshake (SYN, SYN-ACK, ACK) and maintains a reliable pathway for data exchange until one side closes the connection.
- When should I use TCP instead of UDP?
- Use TCP when data integrity is more important than latency, such as for banking transactions, file downloads, email, and web services. Use UDP for applications tolerant of some data loss, like video calls or online multiplayer games.
- Is TCP formal or informal?
- TCP is neutral in formality. It is used in both casual team conversations and formal technical documentation without adjustment.
