- A
High CPU usage on the switch
Why wrong: Not a direct symptom of ARP spoofing.
- B
Duplicate IP addresses in the ARP table
ARP spoofing can cause multiple MACs for one IP.
- C
Increased broadcast traffic
Why wrong: ARP spoofing does not necessarily increase broadcasts.
- D
Intermittent connectivity to a server
Traffic may be intercepted, causing connectivity issues.
- E
Unusual outbound DNS queries
Why wrong: More indicative of DNS tunneling.
Question 856 of 988
350-701 Security Concepts Practice Question
This 350-701 practice question tests your understanding of security concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 security analyst is investigating a potential ARP spoofing attack. Which two symptoms would indicate this type of attack?
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
✓
Duplicate IP addresses in the ARP table
ARP spoofing involves sending fake ARP messages to associate the attacker's MAC with the IP of another host, causing traffic to be misdirected.
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.
- ✗
High CPU usage on the switch
Why it's wrong here
Not a direct symptom of ARP spoofing.
- ✓
Duplicate IP addresses in the ARP table
- ✗
Increased broadcast traffic
Why it's wrong here
ARP spoofing does not necessarily increase broadcasts.
- ✓
Intermittent connectivity to a server
Why this is correct
Traffic may be intercepted, causing connectivity issues.
Related concept
CIDR notation defines the prefix length.
- ✗
Unusual outbound DNS queries
Why it's wrong here
More indicative of DNS tunneling.
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.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 350-701 question test?
Security Concepts — This question tests Security Concepts — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Duplicate IP addresses in the ARP table — ARP spoofing involves sending fake ARP messages to associate the attacker's MAC with the IP of another host, causing traffic to be misdirected.
What should I do if I get this 350-701 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jul 4, 2026
This 350-701 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 350-701 exam.
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