CompTIA Network+ Practice Test for Subdomain 1.7 #02

Welcome to today’s CompTIA Network+ practice test!

This practice test uses our new UI!

Today’s practice test is based on Subdomain 1.7 (Given a scenario, use appropriate IPv4 network addressing) from the CompTIA Network+ N10-009 objectives.

This beginner-level practice test is inspired by the CompTIA Network+ (N10-009) exam and is designed to help you reinforce key networking concepts on a daily basis.

These questions are not official exam questions, nor are they brain dumps, but they reflect topics and scenarios relevant to the Network+ certification. Use them to test your knowledge, identify areas for improvement, and build daily cybersecurity habits.

Note: CompTIA and Network+ are registered trademarks of CompTIA. This content is not affiliated with or endorsed by CompTIA.

To choose CompTIA Network+ practice tests based on specific domains/subdomains, click that link.

CompTIA Network+ Practice Test for Subdomain 1.7 #02

10 questions • Single best answer

Question 1

A help desk analyst receives a ticket from a user reporting that they cannot access any shared drives, printers, or the internet, but the machine appears to boot normally. The analyst runs ipconfig on the Windows workstation and observes the IP address 169.254.87.14 with a subnet mask of 255.255.0.0. The DHCP server is confirmed operational and serving all other workstations on the same floor. What does this address assignment indicate?

A. The workstation has been manually configured with a static IP in the link-local range by a previous administrator B. The DHCP server intentionally assigned this address to isolate the workstation from the production network C. The workstation failed to obtain a DHCP lease and self-assigned an APIPA address, preventing normal network communication D. The address is a valid Class B private address from the RFC1918 range and should allow full network access

Question 2

A network administrator is auditing the IP addressing plan for an organization preparing to expand its internal network infrastructure. The team must confirm that all internal host addresses use private, non-routable space as defined by RFC1918 to avoid conflicts with public internet routing. Which of the following address ranges is NOT defined as private address space by RFC1918?

A. 10.0.0.0/8 B. 172.16.0.0/12 C. 192.168.0.0/16 D. 192.0.2.0/24

Question 3

A developer at a software firm is testing a locally hosted REST API before staging it for production deployment. The developer successfully reaches the API at http://127.0.0.1:8080 from the same machine. A colleague on the same LAN subnet attempts to connect to http://127.0.0.1:8080 from their own workstation and receives a connection refused error. Which of the following best explains this behavior?

A. The address 127.0.0.1 is a broadcast address that cannot be used for directed traffic between hosts B. The loopback address 127.0.0.1 refers only to the local machine itself and is never transmitted on the physical network C. The 127.0.0.0/8 range is a private RFC1918 block that requires NAT to reach across a subnet boundary D. The colleague's workstation is blocking traffic to 127.0.0.1 because APIPA conflicts with the loopback range

Question 4

A network engineer at a healthcare organization needs to divide the 192.168.20.0/24 address block into exactly four equal subnets to support four separate VLANs. The engineer uses CIDR notation to select the correct subnet mask. Which CIDR prefix length correctly divides a /24 network into exactly four equal subnets?

A. /25 B. /26 C. /27 D. /28

Question 5

During a network audit at a financial services company, a technician records a device with the IP address 172.19.45.200. The technician must correctly classify this address by both its IPv4 class and whether it is private or public according to RFC1918. Which of the following correctly identifies this address?

A. Class A, private address per RFC1918 B. Class B, private address per RFC1918 C. Class B, public address routable on the internet D. Class C, private address per RFC1918

Question 6

A network engineer at a regional university is designing an IP addressing scheme for four departments using the 10.10.0.0/24 block. Department A requires 100 hosts, Department B requires 50 hosts, Department C requires 25 hosts, and Department D requires 10 hosts. The engineer decides to use Variable Length Subnet Masking (VLSM). What is the primary advantage of using VLSM over traditional fixed-length subnetting in this scenario?

A. VLSM allows subnets to use both public and private address ranges simultaneously within the same network B. VLSM enables each subnet to be sized according to its actual host requirements, minimizing wasted IP address space C. VLSM eliminates the need for a default gateway by allowing hosts to communicate directly across subnet boundaries D. VLSM automatically configures DHCP scope options for each department based on subnet size

Question 7

A network instructor is reviewing IPv4 address class concepts with a group of certification candidates. One candidate asks about the purpose of Class D addresses and how they differ from Class A, B, and C. Which of the following correctly describes the intended use of Class D IPv4 addresses?

A. Class D addresses are reserved by IANA for experimental and future use and should never appear in production environments B. Class D addresses are used for multicast communication, allowing a single packet to be delivered to a group of interested receivers simultaneously C. Class D addresses are private addresses allocated to ISPs for internal backbone routing between edge routers D. Class D addresses represent the APIPA range and are assigned automatically when DHCP services are unavailable

Question 8

An ISP assigns the network block 198.51.100.0/28 to a new small business customer. The customer's network administrator needs to determine how many IP addresses can actually be assigned to host devices within this allocation. How many usable host addresses are available in a /28 network?

A. 16 B. 14 C. 30 D. 12

Question 9

A network administrator at a logistics company is reviewing perimeter firewall logs and notices that packets are being dropped at the WAN interface with a source IP address of 10.200.100.55. The firewall policy includes an inbound rule that denies RFC1918 addresses arriving on the external interface. Why is this firewall rule considered a security best practice?

A. RFC1918 addresses are part of the Class D multicast range and are automatically blocked by all stateful firewalls B. RFC1918 addresses are non-routable on the public internet and should never legitimately appear as source addresses on the WAN interface, making their presence indicative of IP spoofing or misconfiguration C. The 10.0.0.0/8 range conflicts with the loopback address space and must be filtered at all network boundaries D. RFC1918 addresses trigger APIPA self-assignment on connected hosts if not blocked at the perimeter

Question 10

A network team at a manufacturing company is onboarding a new site and reviewing the existing IP documentation. An engineer identifies that several servers are assigned addresses in the 10.0.0.0/8 block and asks a junior team member to classify them correctly. Which of the following correctly describes addresses in the 10.0.0.0/8 range?

A. Class B, private addresses per RFC1918 with a default subnet mask of 255.255.0.0 B. Class A, public addresses allocated by IANA to large enterprises C. Class A, private addresses per RFC1918 with a default subnet mask of 255.0.0.0 D. Class C, private addresses per RFC1918 with a default subnet mask of 255.255.255.0

CompTIA Network+ Practice Test for Subdomain 1.7 #02

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