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CompTIA N10-009 Exam Questions
Free CompTIA N10-009 Exam Actual Questions
Note: Premium Questions for N10-009 were last updated On Jul. 30, 2026 (see below)
A network administrator is looking for a solution to extend Layer 2 capabilities and replicate backups between sites. Which of the following is the best solution?
The correct solution is a Data Center Interconnect (DCI). DCIs extend Layer 2 networks across geographically dispersed data centers, enabling seamless replication of services such as SAN storage, backup synchronization, or VM migrations. This ensures workloads and data can move between sites while maintaining the same VLANs and addressing.
A . Security Service Edge (SSE) provides cloud-delivered security functions like secure web gateways and CASB, not Layer 2 extension.
C . Infrastructure as code (IaC) automates deployment and management of network infrastructure but is unrelated to extending Layer 2 domains.
D . Zero Trust architecture is a security framework ensuring strict access control but doesn't address network connectivity between sites.
In scenarios where backups need replication between sites, Layer 2 extension is often required so systems can communicate as if they are in the same broadcast domain. DCI is specifically designed to provide this functionality reliably and securely.
Reference (CompTIA Network+ N10-009):
Domain: Network Infrastructure --- WAN technologies, data center interconnect, backup replication.
Which of the following internal routing protocols is best characterized as having fast convergence and being loop-free?
The correct answer is OSPF (Open Shortest Path First). OSPF is a link-state routing protocol known for its fast convergence and use of the Dijkstra algorithm to calculate the shortest loop-free path. It efficiently scales to large enterprise networks and avoids routing loops by maintaining a complete topology map.
A . BGP is primarily an external routing protocol used between ISPs, not internal.
B . STP is not a routing protocol; it prevents loops at Layer 2.
D . RIP is an older distance-vector protocol with slower convergence and a maximum hop limit of 15.
OSPF's design makes it the preferred internal gateway protocol (IGP) for medium-to-large organizations requiring speed and loop-free reliability.
Reference (CompTIA Network+ N10-009):
Domain: Networking Concepts --- IGPs, OSPF, routing protocols.
Which of the following could provide a lightweight and private connection to a remote box?
Secure Shell (SSH) is a protocol used to securely access remote devices over an unsecured network. It provides encrypted command-line access and is a lightweight and secure method of remote administration.
A . Site-to-site VPN connects entire networks, not just a single host.
B . Telnet is not secure; it transmits data (including credentials) in plaintext.
C . Console access is direct via serial cable, not remote.
Reference:
CompTIA Network+ N10-009 Official Objectives: 2.6 -- Configure and troubleshoot remote access.
Which of the following should a network engineer check to verify that updates are still being released for a device?
The correct answer is B. EOL documentation. If a network engineer wants to confirm whether a device is still receiving updates, patches, or vendor support, the first thing to review is the vendor's End-of-Life (EOL) and often related End-of-Support (EOS) documentation. These documents show whether the device is still actively supported, whether firmware and security updates are still being issued, and when that support is scheduled to stop.
This is important in network operations because devices that are no longer supported can become security risks and operational liabilities. Once a vendor declares a product end-of-life or end-of-support, future bug fixes, feature releases, and security updates may no longer be available. That directly affects patch management, lifecycle planning, and risk assessment.
The other choices do not answer the question as directly. A baseline configuration shows the intended device settings, not the support status. Asset inventory licensing helps track ownership, software entitlements, or subscriptions, but it does not prove that updates are still being released. Software development life cycle refers to the process of building software, not the support state of a deployed network device.
For Network+ exam purposes, when the question asks whether updates are still being released, the best source is the vendor's EOL documentation.
A company is opening a new site that needs to be divided into subnets that accommodate 75 hosts each. Which of the following is the most efficient subnet?
To support 75 hosts per subnet, you must choose a subnet size that provides at least 75 usable IP addresses. In IPv4, usable hosts per subnet equals 2^(host bits) 2 (subtracting network and broadcast). A /25 leaves 7 host bits (32--25 = 7), giving 2^7 2 = 128 2 = 126 usable hosts, which meets the requirement and is the smallest (most efficient) option listed that does so. A /26 leaves 6 host bits, giving 62 usable hosts, which is insufficient. A /27 gives 30 usable, and a /28 gives 14 usable, both far below 75. Network+ subnetting objectives emphasize selecting the smallest subnet that satisfies the host requirement to conserve address space while meeting growth and design constraints. Therefore, 192.168.13.0/25 is the most efficient option that accommodates at least 75 hosts per subnet.
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