Objective 5.3
N10-009Given a scenario, troubleshoot common issues with network services.
Objective 5.3 sits in Network Troubleshooting, which carries 24% of the Network+ exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.
Objective title verbatim from the official objectives. CompTIA exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
A network administrator notices that new laptops joining the office subnet fail to receive IP addresses, while existing devices keep working normally. Which issue is most likely occurring?
Correct.
Checked against learn.microsoft.com, July 2026Concept
A fault that hits only new arrivals while everything already working keeps working points at an allocation step, not at a path. State handed out earlier stays valid on the machines holding it, so the break stays invisible until something has to ask for a fresh assignment. Ask what is being requested at the moment of failure.
Why A
New devices failing to get addresses while existing leased devices keep working is the classic symptom of a DHCP scope running out of available addresses, i.e. address pool exhaustion.
Source
Microsoft Learn: Windows Server DHCP, checked July 2026The DHCP server maintains a pool of IP addresses and leases an address to any DHCP-enabled client when it starts up on the network. Because the IP addresses are dynamic (leased) rather than static (permanently assigned), addresses no longer in use are automatically returned to the pool for reallocation.
Now you: objective 5.3 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
In Windows Server DHCP, which feature forwards client DHCP messages across subnet boundaries so that a DHCP server is not required on every subnet?
Sample question 2 of 3
A user's workstation received a lease from the DHCP server and can communicate with hosts on the local subnet, but all connections to remote networks time out. Which DHCP option value is most likely missing or wrong?
Sample question 3 of 3
A network printer holds a DHCP reservation for 192.168.1.50. A laptop later receives a dynamic lease for the same address, and both devices report an IP conflict. Which administrator action most likely caused this?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.