What Does a Successful DoS Attack Most Likely Affect?
Short answer
A A successful DoS flood saturates available bandwidth, so bandwidth is the resource most likely affected among the listed options.
Question
Key Takeaways
The exam tests whether you can map a DoS attack to the finite resource it directly consumes—bandwidth—rather than to configuration objects or storage side effects.
This N10-009 item asks which resource a successful DoS attack most likely degrades, and the answer is network bandwidth (A). The explanation separates primary DoS resource exhaustion from secondary effects such as NAT pool, ACL, or storage pressure.
Common mistake: A tempting wrong answer is D, storage availability, because some attacks fill disks or logs; however, a classic successful DoS flood overwhelms throughput, not storage capacity.
Expert Analysis
The boundary: availability through resource exhaustion A DoS attack is defined by its outcome, not by one packet type: it makes a service or network unavailable by exhausting a finite resource. In this scenario, the word “successful” is the clue. A flood that fills the access link or ISP circuit consumes the capacity legitimate traffic needs, so the immediate casualty is bandwidth. That is why A is the best answer.
Why not the other resources A NAT pool (B) can be depleted by many simultaneous translations, and an ACL (C) can be stressed by a high volume of matching traffic, but neither is the primary target of a generic DoS; they are configuration or stateful side effects. Storage availability (D) becomes the headline issue in a disk-filling or log-exhaustion attack, not in the classic traffic flood described here. DoS is about reachability and throughput; storage is about data capacity.
DoS vs. DDoS The common confusion is DoS versus DDoS. Both can saturate bandwidth; the difference is source count. A single host flooding a target is still a DoS, and the impact remains bandwidth contention. The supplied comment makes the same point: malicious traffic consumes throughput and prevents legitimate users from reaching services. So do not overthink whether there is one attacker or a botnet—the question asks what a successful DoS most likely affects.
Exam takeaway When an item asks for the “most likely” impact, choose the shared resource consumed by the attack traffic itself: bandwidth. Reserve NAT pool and ACL for questions about connection-state exhaustion or filtering behavior, and storage for disk-fill or logging attacks.
Official Reference
- https://csrc.nist.gov/glossary/term/denial_of_service
- https://www.comptia.org/certifications/network
These links open the official vendor documentation in a new tab.
Exam Strategy
For attack-impact questions, identify the resource the attack traffic consumes in real time. DoS and DDoS floods compete for link capacity, so choose bandwidth unless the stem names a disk-fill, log, connection-table, or NAT-translation symptom. Use the “most likely” wording to reject resources that are only indirectly affected or require a special variant. This technique also helps separate DoS from malware, ransomware, and reconnaissance questions.
Frequently Asked Questions
Why is bandwidth more affected than storage availability in a DoS attack?
Can a DoS attack exhaust a NAT pool instead of bandwidth?
Does a DoS attack require multiple sources?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 1 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 1
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ERB14 👍 1 Answered AA. Bandwidth: A Denial of Service (DoS) attack aims to overwhelm a target network or server with a flood of malicious traffic. This traffic consumes all available network throughput (bandwidth), saturating the pipe and preventing legitimate users from accessing services or resources.
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