Courseiva
← N10-009
Full test
easymultiple choiceObjective-mapped

A security analyst notices that the company's web server is receiving a high volume of TCP SYN packets from a single source IP address, but the server is not completing the three-way handshake. Which type of attack is most likely occurring?

Question 1easymultiple choice
Full question →

A security analyst notices that the company's web server is receiving a high volume of TCP SYN packets from a single source IP address, but the server is not completing the three-way handshake. Which type of attack is most likely occurring?

Full question →

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) SYN flood

Correct. A SYN flood is a DoS attack that sends numerous SYN packets, leaving half-open connections and consuming server resources.

B

Distractor review

B) Smurf attack

Incorrect. A Smurf attack uses ICMP echo requests to a broadcast address, causing all hosts to reply to the victim. It does not involve TCP SYN packets.

C

Distractor review

C) Ping of death

Incorrect. A Ping of death sends an oversized ICMP packet that causes a buffer overflow. It does not use TCP SYN packets.

D

Distractor review

D) ARP poisoning

Incorrect. ARP poisoning involves sending fake ARP replies to intercept traffic, not sending TCP SYN packets to a server.

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.

Related practice questions

Related N10-009 practice-question pages

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

Network+ network fundamentals practice questions

Practise N10-009 questions linked to Network+ network fundamentals.

Network+ implementation practice questions

Practise N10-009 questions linked to Network+ implementation.

Network+ operations practice questions

Practise N10-009 questions linked to Network+ operations.

Network+ security practice questions

Practise N10-009 questions linked to Network+ security.

Network+ troubleshooting practice questions

Practise N10-009 questions linked to Network+ troubleshooting.

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

A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?

Question 2

A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?

Question 3

A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?

Question 4

A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?

Question 5

A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?

Question 6

A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?

FAQ

Questions learners often ask

What does this N10-009 question test?

CIDR notation defines the prefix length.

What is the correct answer to this question?

The correct answer is: A) SYN flood — A SYN flood attack sends many TCP SYN requests without completing the handshake, exhausting the server's connection queue. This prevents legitimate connections. A Smurf attack uses ICMP broadcast amplification. A Ping of death involves oversized ICMP packets. ARP poisoning manipulates local ARP caches.

What should I do if I get this N10-009 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

Discussion

Loading comments…

Sign in to join the discussion.