1.07.1Basic
Review the basic properties of UDP as a transport protocol over IP.
Which description is correct?
× Incorrect
UDP is connectionless and sends independent datagrams with low overhead. Delivery and ordering are not guaranteed by UDP itself.
Detailed explanation
Incorrect通信開始前に接続を確立し、受信確認と再送を必ず行う
Incorrect. This describes TCP's connection and reliability controls.
Correct接続確立を必要とせず、独立したデータグラムを低いオーバーヘッドで送る
Correct. UDP sends datagrams without establishing a connection.
Incorrect経路上のTTL超過などを通知し、アプリケーションのポート番号を識別しない
Incorrect. This describes ICMP.
Incorrect常に暗号化と相手認証を行ってからデータを送る
Incorrect. UDP itself does not provide encryption or peer authentication.
Try it yourself
An example you can run in a temporary verification environment.
python3 -c "import socket; print(socket.getprotobyname('udp'), socket.SOCK_DGRAM)"Expected result
17 2（UDPのプロトコル番号とデータグラムソケット種別）Key points
- Connectionless
- Datagram service
- No delivery or ordering guarantee
Notes
- Environment: Python 3 socket / 外部通信なし
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Network prefix
The part of an IP address that identifies the network rather than a host.
Transport protocol
TCP and UDP provide different delivery, reliability, and connection semantics.
Service port
A numbered endpoint used to deliver traffic to a network service.
Question IDKL-102-954
EnvironmentPython 3 socket / 外部通信なし
Last technical review2026-08-13
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