Acknowledgment
An acknowledgment is a protocol message or signal confirming that transmitted data, a message, request, or operation was received or processed.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
An acknowledgment is an 802.11 control message confirming receipt of a frame.
- How it is used
- Confirms successful 802.11 frame delivery and triggers retransmission when confirmation is missing.
- How deep it goes
- Explains control-frame classification, receiver confirmation, and retransmission, but does not detail timing or frame fields.
- Examples
- Uses wireless frame delivery and contrasts DHCP lease confirmation with TFTP block acknowledgments.
- What you can do after
- Evaluate whether a wireless frame was confirmed and understand why the sender retransmits it.
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Kafka for Architects
An acknowledgment is a confirmation that a message or delivery operation has been received or completed.
- How it is used
- Confirms broker acceptance so producers can decide whether to retry an unconfirmed send.
- How deep it goes
- Explains producer and consumer confirmation through failure recovery, but defers detailed client configuration choices.
- Examples
- Uses a timeout-and-retry diagram and a customer address-change event distributed to independent subscribers.
- What you can do after
- Operate/configure it by considering producer acknowledgment settings alongside data criticality, replication, and consumer offset commits.
Apache Kafka in Action
An acknowledgment (ack) is a Kafka broker response indicating the configured level of message receipt or persistence.
- How it is used
- Uses producer ACKs to choose when a Kafka write is confirmed and to weigh reliability against latency.
- How deep it goes
- Explains three settings, failure risks, callbacks, and broker-side waiting, without detailing consumer read tracking.
- Examples
- Demonstrates each setting with a console producer and shows a Python delivery callback.
- What you can do after
- Operate/configure it by setting producer `acks` and interpreting which write stage an ACK confirms.
Akka in Action, Second Edition
An acknowledgment is a message or signal confirming that a sent message or operation has been received or processed.
- How it is used
- Coordinates asynchronous actor work when the sender must know whether processing produced a response.
- How deep it goes
- Contrasts confirmation with fire-and-forget delivery and traces timeouts, worker failure, and dead letters.
- Examples
- Uses Conversation–Mentions communication and manager–worker processing with successful replies, timeouts, and dead letters.
- What you can do after
- Diagnose actor interactions by distinguishing replies, timeouts, and dead-lettered messages.
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Related concepts
- TCPused by · TCP is a connection-oriented transport-layer protocol that provides reliable, ordered delivery of byte streams between network endpoints.
- primary nodeproduced by · A primary node is a designated authoritative or coordinating member of a distributed system, typically responsible for accepting operations or coordinating replicated state.
- network threadproduced by · A network thread is a broker thread that handles network communication and contributes to the broker's request-processing capacity.
- Kafka producerused by · A Kafka producer is an application or client that publishes records to Kafka topics.
- producerused by · A producer is an entity or process that creates or supplies values, data, messages, events, or work for another entity to consume.
- synchronous replicationused by · Synchronous replication is a replication method in which an operation is acknowledged or completed only after required replicas have confirmed the change.
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