Quick Answer
The answer is Syslog, because it is the standard protocol for collecting and forwarding device logs from routers and switches to a central server for long-term retention and analysis. Unlike NetFlow, which focuses on traffic flow metadata and bandwidth usage, Syslog captures event-driven messages such as interface status changes, security alerts, and system errors, making it the correct choice for centralized logging. On the AZ-104 exam, this distinction often appears in scenarios involving monitoring and logging configurations, where a common trap is confusing NetFlow’s traffic analysis capabilities with Syslog’s log collection purpose. Remember that Syslog handles “what happened” (events and errors), while NetFlow handles “how traffic moved” (flows and throughput). A useful memory tip: Syslog sends sys-logs, NetFlow tracks net-flows.
This AZ-104 practice question tests your understanding of implement and manage virtual networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer wants device logs from routers and switches sent to a central server for long-term retention and analysis. Which service should be configured?
NTP
Why wrong: NTP keeps time in sync but does not collect logs.
DNS
Why wrong: DNS resolves names.
Syslog
Syslog provides centralized event logging.
NetFlow
Why wrong: NetFlow exports traffic metadata, not general device log messages.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Syslog
Syslog is the standard protocol for sending device logs (e.g., from routers and switches) to a central server for long-term retention and analysis. It operates over UDP port 514 (or TCP 6514 for reliable delivery) and allows network devices to forward event messages to a syslog collector, which can store, filter, and analyze them. This directly meets the requirement for centralized logging and analysis.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
NTP
DNS
Why it's wrong here
DNS resolves names.
When this WOULD be correct
If the exam question asked for a service that translates domain names into IP addresses for devices to communicate effectively, DNS would be the correct answer. For example, a question might ask about configuring a network to ensure that devices can resolve hostnames to IP addresses.
Syslog
Why this is correct
Syslog provides centralized event logging.
Related concept
Read the scenario before looking for a memorised answer.
NetFlow
Why it's wrong here
NetFlow exports traffic metadata, not general device log messages.
When this WOULD be correct
If the question asked for a solution to analyze network traffic patterns and bandwidth usage from routers and switches, then NetFlow would be the correct answer. In this scenario, the focus would be on traffic flow data rather than log retention.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
Syslog provides centralized event logging.
Why this is wrong here
NTP (Network Time Protocol) is used for synchronizing the clocks of network devices, not for collecting or sending logs. Therefore, it does not fulfill the requirement of sending device logs for analysis.
★ When this WOULD be the correct answer
If the exam question asked which service is used for time synchronization across network devices to ensure accurate timestamps on logs, then NTP would be the correct answer.
Why candidates choose this
Candidates may confuse NTP with log management services due to its importance in network operations, leading them to mistakenly think it could also handle log collection.
Why this is wrong here
DNS (Domain Name System) is used for resolving domain names to IP addresses and does not facilitate the collection or centralization of device logs from routers and switches.
★ When this WOULD be the correct answer
If the exam question asked for a service that translates domain names into IP addresses for devices to communicate effectively, DNS would be the correct answer. For example, a question might ask about configuring a network to ensure that devices can resolve hostnames to IP addresses.
Why candidates choose this
Candidates may confuse the need for network services and think that DNS is relevant for network management tasks, leading them to select it without fully understanding the specific logging requirements of the question.
Why this is wrong here
NetFlow is primarily used for monitoring and analyzing network traffic flows rather than collecting device logs. It does not provide the capability to send logs from routers and switches to a central server for retention and analysis.
★ When this WOULD be the correct answer
If the question asked for a solution to analyze network traffic patterns and bandwidth usage from routers and switches, then NetFlow would be the correct answer. In this scenario, the focus would be on traffic flow data rather than log retention.
Why candidates choose this
Candidates may choose this option because they associate NetFlow with network monitoring and performance analysis, mistakenly believing it can also handle log collection and retention tasks.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
The trap here is confusing NetFlow with syslog — both involve network data, but NetFlow is for traffic flow statistics (e.g., who talked to whom, how much bandwidth), not for device event logs, so candidates often pick NetFlow thinking it covers 'analysis' without realizing it doesn't handle log messages.
Detailed technical explanation
Syslog messages follow RFC 5424 (or the older RFC 3164) and include a severity level (0–7) and facility code, allowing granular filtering on the collector. In real-world deployments, syslog can be paired with SIEM tools (e.g., Splunk, ELK) for correlation and alerting, and devices often use logging buffered, logging console, and logging host commands to direct logs. A subtle behavior: syslog uses UDP by default, which is connectionless and may drop messages under heavy load; for critical logs, TCP or TLS (e.g., syslog over TCP 6514) is recommended for reliability.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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FAQ
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
The correct answer is: Syslog — Syslog is the standard protocol for sending device logs (e.g., from routers and switches) to a central server for long-term retention and analysis. It operates over UDP port 514 (or TCP 6514 for reliable delivery) and allows network devices to forward event messages to a syslog collector, which can store, filter, and analyze them. This directly meets the requirement for centralized logging and analysis.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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