CompTIA Network+ Practice Test for Subdomain 3.4 #02

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Today’s practice test is based on Subdomain 3.4 (Given a scenario, implement IPv4 and IPv6 network services) 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.

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

CompTIA Network+ Practice Test for Subdomain 3.4 #02

10 questions • Single best answer

Question 1

A help desk analyst receives a ticket from a remote office user who reports that their workstation cannot connect to any network resources after a DHCP server outage. The analyst notices that the workstation has automatically assigned itself an IP address in the 169.254.0.0/16 range. The workstation is now attempting to communicate using this address. Which feature caused the workstation to self-assign this address?

A. SLAAC, which allows IPv6-capable devices to generate their own addresses using the router's advertised prefix B. APIPA, which causes a Windows device to self-assign a link-local IPv4 address in the 169.254.0.0/16 range when a DHCP server cannot be reached C. A static IP address configured by the user under the network adapter settings as a fallback address D. DHCP relay, which forwards the workstation's DISCOVER message to a backup DHCP server on a remote subnet

Question 2

A network engineer is configuring DHCP on a new branch office router. Fifteen devices need permanent IP address assignments because they host services accessed by name and IP. The remaining forty workstations should receive dynamic addresses from the available pool. The engineer wants the permanent assignments tied to each device's hardware identifier so the same address is always given to each specific device. Which DHCP feature should be configured for the fifteen service hosts?

A. DHCP exclusions, which remove specific IP addresses from the dynamic pool so they cannot be assigned to any device B. DHCP reservations, which bind a specific IP address to a client's MAC address so that device always receives the same lease C. DHCP lease time reduction, which forces all devices to renew more frequently so reserved addresses remain available D. DHCP scope options, which push default gateway and DNS server information to all clients requesting an address

Question 3

A network administrator at a university campus is designing the IP address management strategy for new student dormitory subnets. Each subnet spans a different VLAN and is served by a centralized DHCP server located in the core network. Student devices connecting to a dormitory VLAN send DHCP DISCOVER broadcasts, but broadcasts do not cross VLAN boundaries. Which DHCP feature must be configured on each dormitory VLAN gateway to forward DHCP requests from the students to the central server?

A. DHCP lease time, configured on each VLAN interface to match the central server's scope settings for the dormitory subnets B. DHCP relay agent, also known as IP helper, configured on each VLAN interface to forward client broadcast DISCOVER messages as unicast to the central DHCP server C. DHCP reservations on the central server for every student device MAC address to ensure correct subnet assignment D. DHCP exclusions on the central server removing all dormitory subnet addresses from the dynamic pool until relay forwarding is confirmed

Question 4

A junior network technician is reviewing DNS record types for a company's internal zone. The technician needs to identify the record type responsible for resolving a hostname such as server01.corp.local to its IPv4 address, as well as the record type used to resolve a hostname to its IPv6 address. Which pair of record types correctly identifies these two mappings?

A. MX records for IPv4 hostname resolution and PTR records for IPv6 hostname resolution B. A records for IPv4 hostname-to-address resolution and AAAA records for IPv6 hostname-to-address resolution C. CNAME records for IPv4 hostname resolution and NS records for IPv6 hostname resolution D. PTR records for IPv4 hostname-to-address resolution and A records for IPv6 hostname-to-address resolution

Question 5

A DNS administrator is troubleshooting an issue where internal clients can reach external websites by IP address but not by hostname. The administrator queries the internal DNS server for an external domain and receives a response from the server's own cache. The administrator notices the cached entry is outdated and does not reflect a recent IP change made by the external domain owner. Which DNS record attribute controls how long a resolver may cache this record before querying again?

A. The SOA serial number, which increments when zone data changes and signals secondary servers to initiate a zone transfer B. The TTL (Time to Live) value on the DNS record, which specifies the number of seconds a resolver may cache the record before it must be refreshed C. The NS record priority, which determines the order in which name servers are queried when a cached record becomes stale D. The CNAME chain depth, which limits how many alias redirections the resolver follows before the cached entry expires

Question 6

A network engineer is configuring DNS for a new internal application server that will be accessed by multiple teams using the same hostname app.internal.corp. The application actually runs on three physical servers with different IP addresses for load distribution, and clients should be directed to the appropriate server based on their query. The engineer wants a single hostname to map to multiple IP addresses. Which DNS configuration achieves this?

A. Create a single CNAME record pointing app.internal.corp to one of the three physical server hostnames B. Create multiple A records for app.internal.corp, each pointing to one of the three server IP addresses, allowing DNS round-robin distribution C. Create an MX record for app.internal.corp with a priority value assigned to each server address D. Create a PTR record for each server IP address pointing back to app.internal.corp for reverse resolution

Question 7

A network technician is troubleshooting a workstation that is receiving an IP address but cannot resolve internal hostnames. The technician verifies that the workstation's DNS server setting points to the correct internal DNS server. Upon inspecting the workstation's local hosts file, the technician discovers an entry that maps the internal application server's hostname to an incorrect IP address. The workstation resolves the hostname to the wrong address even though DNS returns the correct answer. Why does the incorrect hosts file entry take precedence over the DNS response?

A. DNS caching on the local resolver takes precedence over hosts file entries, so an incorrect cache entry must have been cleared before the hosts file was checked B. The hosts file is checked before DNS queries are sent by the operating system's resolver, so a matching hosts file entry overrides the DNS response C. The hosts file entry is only used when the DNS server is unreachable, acting as a fallback resolver for offline scenarios D. The workstation applies the hosts file entry only for IPv6 lookups and uses DNS exclusively for IPv4 hostname resolution

Question 8

A network administrator is configuring NTP on all network infrastructure devices in a new data center deployment. All switches and routers must synchronize their clocks to an authoritative time source to ensure consistent log timestamps and certificate validation. The administrator plans to point all devices to an internal NTP server that itself synchronizes to an external stratum 1 source. What stratum level would the internal NTP server in this scenario hold?

A. Stratum 0, because it is directly connected to an external primary reference and acts as the root of the organization's time hierarchy B. Stratum 1, because it synchronizes directly from a stratum 0 reference clock such as a GPS or atomic clock source C. Stratum 2, because it receives time from a stratum 1 external source and distributes that time to stratum 3 clients D. Stratum 3, because all internal NTP servers are classified at stratum 3 regardless of their upstream time source

Question 9

A senior network engineer is explaining DHCPv6 and SLAAC to an intern preparing for certification. The intern asks how an IPv6 device can configure its own IP address without a DHCP server. The engineer explains that the device uses a combination of the router's advertised prefix and its own identifier to form a complete, globally unique IPv6 address. Which IPv6 feature enables this automatic self-configuration?

A. DHCPv6, which assigns globally unique IPv6 addresses from a configured pool in the same way as DHCPv4 B. SLAAC (Stateless Address Autoconfiguration), which allows a device to generate its own IPv6 address using the network prefix from Router Advertisements and a host portion derived from the interface identifier C. Static IPv6 assignment, which requires an administrator to manually configure each device's full 128-bit IPv6 address D. NAT64, which translates IPv4 addresses into IPv6 format to allow legacy devices to communicate on IPv6 networks

Question 10

A network engineer at a company with both IPv4 and IPv6 infrastructure is asked to explain dual stack to a colleague. The colleague asks what the primary advantage of running dual stack is compared to using tunneling or translation mechanisms for IPv6 migration. Which statement best explains the advantage of dual stack?

A. Dual stack reduces IP address consumption by allowing a single IPv4 address to serve as a proxy for multiple IPv6 addresses across the organization B. Dual stack allows a device to run both IPv4 and IPv6 natively and communicate with either protocol without translation or encapsulation overhead C. Dual stack eliminates the need for DNS entirely, as devices use the protocol version determined at the hardware layer rather than hostname resolution D. Dual stack automatically converts all IPv4 traffic to IPv6 over time, completing the migration without administrator intervention

CompTIA Network+ Practice Test for Subdomain 3.4 #02

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