Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A user reports that they cannot access the internet, but they can access local resources on the same subnet. The network administrator pings the default gateway and gets a response. Which tool should be used next to trace the path to an external website?
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
Distractor review
netstat
Netstat displays active connections and listening ports, but does not trace the path to a remote host. It would not help identify where traffic is failing beyond the local gateway.
B
Best answer
traceroute
Traceroute (tracert on Windows) sends packets with increasing TTL values to map the route to a destination. It can show where packets stop or time out, helping identify the point of failure.
C
Distractor review
nslookup
Nslookup queries DNS servers to resolve hostnames to IP addresses. The user can already access local resources, but the problem is connectivity, not name resolution. If the issue were DNS, nslookup could help, but the scenario points to a routing problem.
D
Distractor review
arp
ARP resolves IP addresses to MAC addresses on the local network. Since the gateway is reachable, ARP is not the issue. ARP would not provide information about routing beyond the local subnet.
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: traceroute — When a user can access local resources but not the internet, and the default gateway is reachable, the issue likely lies beyond the gateway. Traceroute identifies the path packets take to a destination, pinpointing where packets are dropped or delayed. Netstat shows local connections, nslookup tests DNS resolution, and arp shows IP-to-MAC mappings, none of which trace the route.
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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