Question 1,893 of 2,152

Device Management →hardMultiple ChoiceObjective-mapped

300-410 Device Management Practice Question

This 300-410 practice question tests your understanding of device management. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

Network management traffic from a monitoring server to routers R1, R2, and R3 is being blocked intermittently. The monitoring server uses SNMP and SSH. R1 configuration: access-list 100 permit udp any any eq snmp, access-list

100 permit tcp any any eq 22, access-list 
100 deny ip any any, and 'ip access-group 100 in' on the management interface. R2 shows: 'show snmp' indicates SNMP is enabled. R3 shows: 'show ssh' indicates SSH is enabled. The monitoring server can reach R1 but not R2 or R3. What is the root cause?

Question 1hardmultiple choice

Read the full network assurance explanation →

A
The ACL permits only SNMP and SSH, but blocks other necessary traffic such as ICMP and routing protocol packets, preventing the monitoring server from reaching R2 and R3.
The implicit deny at the end of the ACL blocks all traffic not explicitly permitted, including ICMP echo requests and routing updates, which are needed for end-to-end connectivity.
B
The ACL is applied in the wrong direction; it should be applied outbound to allow traffic from the management interface.
Why wrong: Applying the ACL inbound filters traffic entering the interface; outbound would filter traffic leaving. The direction is correct for filtering incoming management traffic, but the content is insufficient.
C
SNMP and SSH are not enabled on R2 and R3.
Why wrong: The scenario states SNMP is enabled on R2 and SSH on R3.
D
The monitoring server is not in the same subnet as the management interface, so routing is required but blocked by the ACL.
Why wrong: Routing is needed, but the ACL blocks routing updates, which is part of the issue.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The ACL permits only SNMP and SSH, but blocks other necessary traffic such as ICMP and routing protocol packets, preventing the monitoring server from reaching R2 and R3.

The ACL on R1 is applied inbound on the management interface, which filters traffic coming into R1. However, for traffic to reach R2 and R3, it must traverse R1. The ACL permits SNMP and SSH to any destination, but the implicit deny at the end blocks other traffic, including routing protocols or ICMP needed for reachability. Additionally, the ACL may be blocking return traffic if not applied correctly. The root cause is that the ACL is too restrictive, blocking necessary control plane traffic.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The ACL permits only SNMP and SSH, but blocks other necessary traffic such as ICMP and routing protocol packets, preventing the monitoring server from reaching R2 and R3.
Why this is correct
The implicit deny at the end of the ACL blocks all traffic not explicitly permitted, including ICMP echo requests and routing updates, which are needed for end-to-end connectivity.
Related concept
CIDR notation defines the prefix length.
✗
The ACL is applied in the wrong direction; it should be applied outbound to allow traffic from the management interface.
Why it's wrong here
Applying the ACL inbound filters traffic entering the interface; outbound would filter traffic leaving. The direction is correct for filtering incoming management traffic, but the content is insufficient.
✗
SNMP and SSH are not enabled on R2 and R3.
Why it's wrong here
The scenario states SNMP is enabled on R2 and SSH on R3.
✗
The monitoring server is not in the same subnet as the management interface, so routing is required but blocked by the ACL.
Why it's wrong here
Routing is needed, but the ACL blocks routing updates, which is part of the issue.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Trap categories for this question

Scenario analysis trap
The scenario states SNMP is enabled on R2 and SSH on R3.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.

Related 300-410 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Layer 3 Technologies practice questions

Practise 300-410 questions linked to Layer 3 Technologies.

EIGRP Troubleshooting practice questions

Practise 300-410 questions linked to EIGRP Troubleshooting.

OSPF Troubleshooting (v2/v3) practice questions

Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).

BGP Troubleshooting practice questions

Practise 300-410 questions linked to BGP Troubleshooting.

Route Redistribution practice questions

Practise 300-410 questions linked to Route Redistribution.

Policy-Based Routing (PBR) practice questions

Practise 300-410 questions linked to Policy-Based Routing (PBR).

VRF-Lite practice questions

Practise 300-410 questions linked to VRF-Lite.

Route Maps and Route Filtering practice questions

Practise 300-410 questions linked to Route Maps and Route Filtering.

Administrative Distance practice questions

Practise 300-410 questions linked to Administrative Distance.

Route Summarization practice questions

Practise 300-410 questions linked to Route Summarization.

Bidirectional Forwarding Detection (BFD) practice questions

Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).

VPN Technologies practice questions

Practise 300-410 questions linked to VPN Technologies.

Practice this exam

Start a free 300-410 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

300-410 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this 300-410 question test?

Device Management — This question tests Device Management — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The ACL permits only SNMP and SSH, but blocks other necessary traffic such as ICMP and routing protocol packets, preventing the monitoring server from reaching R2 and R3. — The ACL on R1 is applied inbound on the management interface, which filters traffic coming into R1. However, for traffic to reach R2 and R3, it must traverse R1. The ACL permits SNMP and SSH to any destination, but the implicit deny at the end blocks other traffic, including routing protocols or ICMP needed for reachability. Additionally, the ACL may be blocking return traffic if not applied correctly. The root cause is that the ACL is too restrictive, blocking necessary control plane traffic.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.