The correct answer is that only SNMP requests from the 192.168.1.0/24 network are allowed with the community string 'public'. This is because the standard ACL named FILTER_SNMP is applied directly to the SNMP community string using the `snmp-server community public RO FILTER_SNMP` command, which restricts SNMP access by source IP address—the ACL permits only the specified subnet and implicitly denies all other traffic. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how to use an ACL with a community string to enforce SNMP access control, a common security requirement for network monitoring. A frequent trap is forgetting that the ACL is applied per community string, not globally, or assuming the `deny any` is optional—it is implicit but often shown for clarity. Memory tip: think of the ACL as a bouncer at the SNMP door—only IPs on the guest list (the permit statement) get in with the correct password (the community string).
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. 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.
Given the following partial configuration on a router:
ip access-list standard FILTER_SNMP
permit 192.168.1.0 0.0.0.255
deny any
!
snmp-server community public RO FILTER_SNMP
snmp-server location DataCenter
snmp-server contact admin@example.com
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only SNMP requests from the 192.168.1.0/24 network are allowed with the community string 'public'.
The configuration applies the standard ACL 'FILTER_SNMP' to the SNMP community string 'public' with read-only (RO) access. The ACL permits only the 192.168.1.0/24 network, so SNMP requests (e.g., GET, GETNEXT) from that subnet are allowed, while all other sources are denied. This is the intended effect of using an ACL to restrict SNMP access by source IP.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Only SNMP requests from the 192.168.1.0/24 network are allowed with the community string 'public'.
Why this is correct
The ACL permits the specified subnet, and the community string is tied to that ACL.
Related concept
Read the scenario before looking for a memorised answer.
✗
SNMP requests from any source are allowed because the ACL is not applied correctly.
Why it's wrong here
The ACL is referenced in the snmp-server community command, so it is applied.
✗
The community string 'public' allows read-write access.
Why it's wrong here
The 'RO' keyword specifies read-only access.
✗
The ACL is applied outbound, so SNMP responses are filtered.
Why it's wrong here
The ACL in the snmp-server community command filters incoming SNMP requests, not responses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between applying an ACL to an SNMP community versus applying it to an interface; the trap here is that candidates may think the ACL filters outbound SNMP responses or that the ACL is not applied correctly, but in reality, it filters incoming SNMP requests based on source IP.
Trap categories for this question
Keyword trap
The 'RO' keyword specifies read-only access.
Command / output trap
The ACL is referenced in the snmp-server community command, so it is applied.
Detailed technical explanation
How to think about this question
Under the hood, when a router receives an SNMP request, it checks the community string and then evaluates the associated ACL against the source IP of the request. If the ACL permits the source, the request is processed; if denied, the router silently drops the request (no response sent). This mechanism is defined in RFC 1901 (Community-based SNMPv2) and is a common security practice to limit SNMP access to trusted management stations, preventing unauthorized network discovery or configuration changes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Only SNMP requests from the 192.168.1.0/24 network are allowed with the community string 'public'. — The configuration applies the standard ACL 'FILTER_SNMP' to the SNMP community string 'public' with read-only (RO) access. The ACL permits only the 192.168.1.0/24 network, so SNMP requests (e.g., GET, GETNEXT) from that subnet are allowed, while all other sources are denied. This is the intended effect of using an ACL to restrict SNMP access by source IP.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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