5.3 Given 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?
The concept
DHCP maintains a pool of addresses for lease. When the pool is fully leased out, no new addresses remain for additional clients, a condition known as address pool exhaustion.
Why this answer
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.
- Correct: this matches the described symptom exactly.
- BA wrong default gateway would let a device get an address but fail to reach other networks, not fail to get an address at all.
- CA VLAN mismatch could cause connectivity issues, but existing devices would also be affected if the VLAN itself were wrong.
- DSTP blocking would affect all traffic through that port, not selectively block only new DHCP clients.
- EA DNS record issue affects name resolution, not the assignment of IP addresses by DHCP.
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.