Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A user reports that they can access a web server by its IP address (e.g., 10.10.10.50) but cannot access it by its domain name (e.g., server.example.com). The technician verifies that the DNS server is reachable and that the name resolves correctly from other workstations on the same subnet. Which of the following should the technician check NEXT?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Check the DNS cache on the user's workstation
A corrupted or stale DNS cache can prevent a client from resolving a name even though the DNS server is functional. Flushing the cache often resolves the issue.
B
Distractor review
Verify the default gateway configuration
Since the user can reach the server by IP address, the default gateway is working; the issue is name resolution, not routing.
C
Distractor review
Renew the DHCP lease
Renewing the DHCP lease would reassign IP configuration but would not directly affect DNS resolution if the workstation already has correct DNS server addresses.
D
Distractor review
Disable the Windows Firewall
Firewall rules at the client could block DNS traffic, but since other users can resolve the name and the client can reach the DNS server, this is less likely than a local DNS cache issue.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Question 2
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 3
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 4
A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?
Question 5
A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?
Question 6
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
FAQ
Questions learners often ask
What does this N10-009 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Check the DNS cache on the user's workstation — Since the DNS server is functioning and other users can resolve the name, the issue is likely local to the user's workstation. A common cause is a stale DNS cache on the client. Additionally, proxy settings could be misconfigured, but checking the DNS cache is a quick first step. The default gateway is not involved since the IP works. The hosts file could also be checked, but DNS cache is more likely. Among the options, checking the local DNS cache is the most direct next step.
What should I do if I get this N10-009 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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