Question 1hardmulti select
Full question →hardmulti selectObjective-mapped
A branch office reports intermittent failures reaching internal sites. DHCP logs show clients receiving leases from an unknown MAC address, and DNS responses for intranet.example resolve to an address owned by the same device. Which two attacks best match the evidence? Select two.
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
A rogue DHCP server is issuing unauthorized lease information.
Clients are receiving leases from an unknown MAC address, which strongly suggests an unauthorized DHCP server on the network. A rogue server can hand out incorrect gateway, DNS, or lease settings and quickly disrupt connectivity. That makes it a direct match for the observed lease behavior.
B
Best answer
DNS spoofing or poisoning is directing users to the wrong host.
If DNS responses for an internal host resolve to an address owned by the suspicious device, name resolution has been manipulated. That is the hallmark of DNS spoofing or poisoning. The attacker is intentionally causing clients to trust false name-to-address mappings, which can redirect traffic or capture credentials.
C
Distractor review
A SYN flood is exhausting the DHCP service.
A SYN flood targets TCP connection handling and would be visible as many incomplete handshakes, not as unauthorized DHCP leases or altered DNS responses. DHCP is a separate protocol, and the symptoms described are about address assignment and name resolution, not session exhaustion on a TCP listener.
D
Distractor review
A port scan is enumerating exposed services on the branch subnet.
Port scanning typically creates many connection attempts across a range of ports or hosts. It does not explain clients getting bad DHCP offers or DNS answers from a suspicious device. The issue here is identity and resolution of network services, not service enumeration.
E
Distractor review
Password spraying is attempting many logins with common passwords.
Password spraying affects authentication logs, usually across identity providers, VPNs, or SaaS platforms. It has no direct relationship to DHCP leases or DNS replies. Those protocols are involved in network configuration and naming, so password spraying is not the best explanation for this evidence.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
An employee reports a ransomware note on a file server. The server is still powered on, shares are still being accessed, and management wants service restored as quickly as possible. What should the incident response team do first?
Question 3
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Question 4
You are handed a company laptop suspected in an insider theft case. Legal says the evidence may be needed in court. Which action best preserves admissibility?
Question 5
A developer wants to reduce the risk of SQL injection in a new customer search form. Which two changes are the best mitigations? Select two.
Question 6
A branch office uses a flat LAN, and a compromise on one user workstation could spread quickly to finance systems. Management wants finance workstations isolated from general users, but finance staff still need access to a central finance application and network printer. What is the best design change?
FAQ
Questions learners often ask
What does this SY0-701 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: A rogue DHCP server is issuing unauthorized lease information. — The evidence points to two related network attacks. An unknown device issuing DHCP leases is a rogue DHCP server, which can hand clients bad configuration details. The same device answering DNS requests with incorrect addresses indicates DNS spoofing or poisoning. Together, these attacks can redirect traffic, break connectivity, and potentially set up interception or credential theft. Why others are wrong: SYN flooding, port scanning, and password spraying all produce different telemetry. They would not create unauthorized DHCP leases or false DNS responses from the same device. The key evidence is protocol abuse of configuration and name-resolution services, which maps directly to rogue DHCP and DNS poisoning.
What should I do if I get this SY0-701 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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