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For learners studying for CompTIA Network+ N10-010 (V10)
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Practice pack content
Domain 1 - Networking Concepts
Domain 2 – Network Implementation
Domain 3 – Network Operations
Domain 4 – Network Security
Domain 5 – Network Troubleshooting
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Try 3 Network+ N10-010 practice questions
Choose an answer, explore the explanation, and see why the other options are less suitable. Three short scenarios. No sign-in required.
1. Sizing an office subnet
A technician is allocating a conventional IPv4 subnet for an office VLAN with 50 client devices and one router interface serving as the default gateway. The network and broadcast addresses cannot be assigned to devices. Which prefix provides enough usable addresses while allocating the smallest address block?
Answer and full explanation
Correct answer: B — A /26 subnet provides 62 usable addresses.
Why B is correct
A /26 prefix leaves six bits for addresses within the subnet, producing 64 total addresses. Reserving the network and broadcast addresses leaves 62 usable addresses. The office needs 51 usable addresses for its 50 clients and gateway. A /26 therefore meets the requirement with 11 usable addresses remaining. The next smaller block, /27, provides only 30 usable addresses, so /26 is the smallest suitable choice.
Why the other options are less suitable
- A — Larger /25 block: A /25 provides 128 total addresses and 126 usable addresses under the stated convention. It has enough capacity, but allocates a larger block than this office needs.
- C — Insufficient /27 block: A /27 provides 32 total addresses and 30 usable addresses. It cannot accommodate the 51 devices that require addresses on this subnet.
- D — Insufficient /28 block: A /28 provides 16 total addresses and 14 usable addresses. This block is too small for the client devices even before accounting for the gateway.
Key takeaway: Count every required interface, then select the smallest subnet with enough usable host addresses.
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2. Reaching a remote DHCP server
An administrator creates a client VLAN while keeping the DHCP server in a separate, routed subnet. The server already has an active scope for the new VLAN, and routing and firewall rules permit the required traffic, but clients cannot obtain leases. Which configuration should the administrator add to forward the clients' initial DHCP messages to the existing server?
Answer and full explanation
Correct answer: D — Configure DHCP relay on the client VLAN gateway.
Why D is correct
A DHCP relay lets clients communicate with a DHCP server outside their local subnet. Initial DHCP discovery uses a broadcast that ordinary routing does not forward to the remote server. The relay receives the client message and forwards it to the configured DHCP server. Its relay information allows the server to select an appropriate address pool for the client network. Because the scope and routed path already exist, adding the relay addresses the missing function.
Why the other options are less suitable
- A — Remote server as gateway: The default gateway must provide routing from the client's local subnet. Using the remote DHCP server as that gateway does not forward the initial DHCP broadcast or replace a relay.
- B — DNS forwarding: A DNS forwarder sends name-resolution queries to another DNS server. DHCP address assignment is a separate service, so this configuration does not deliver client discovery messages.
- C — Additional static route: The scenario already confirms a working routed path to the server. Another static route would not make the gateway relay the local DHCP discovery broadcast.
Key takeaway: An available DHCP scope and working routing still require a relay when clients and the server occupy different routed subnets.
3. Correcting a stale DNS record
An internal application moves to a new IPv4 address and responds when a technician connects directly to that address, but users entering its hostname still reach the old server. A direct query to the authoritative DNS server returns the application's previous IPv4 address. Which change corrects the source of this name-resolution problem?
Answer and full explanation
Correct answer: A — Update the authoritative A record.
Why A is correct
An A record maps a hostname to an IPv4 address. The authoritative response shows that the source record still contains the old address. Updating that record corrects the hostname's published destination. Cached copies may still require expiration or an appropriate cache refresh before every client observes the change. The successful direct connection and incorrect authoritative response make the address record the relevant starting point.
Why the other options are less suitable
- B — Reverse DNS record: A PTR record supports reverse lookup from an address to a name. Changing it does not correct the A record used to resolve the application's hostname to an IPv4 address.
- C — Client-cache clearing: Clearing a client cache can help after the authoritative record is correct. Here, a fresh lookup would still retrieve the old address from the authoritative server, so cache clearing alone leaves the cause unresolved.
- D — Longer cache lifetime: TTL controls how long a DNS response can normally remain cached before it is refreshed. Increasing it does not change the record's address and can extend how long newly cached incorrect data remains in use.
Key takeaway: Check the authoritative answer before treating an incorrect DNS result as a client-cache problem.
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Requirements
- Familiarity with IP addressing, switches, routers and basic network services helps you work through these scenarios. Practise reading simple topology diagrams and interpreting a device’s IP configuration.
- If these concepts are unfamiliar, combine question practice with foundational networking study and your own subnetting, configuration and troubleshooting exercises before relying on mixed practice alone.
- Use an internet-connected computer or other suitable device, a current web browser and an ExamsDigest account to access the online practice product and review your work.
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These details describe CompTIA’s official Network+ N10-010 exam.
What our students say
"The subnetting questions showed me where I was making mistakes. Reading the explanations helped me understand the calculations instead of just remembering the correct option."
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"I found DHCP and DNS troubleshooting confusing at first. The scenarios helped me slow down, identify the important clues and work through each problem more carefully”
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"What helped most was understanding why the other answers were wrong. I started keeping notes on the topics I missed and used those notes to guide my revision."
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