Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A user reports that they cannot access the internet. The technician tests connectivity: pinging the default gateway succeeds, but pinging a public IP address like 8.8.8.8 fails. Firewall logs show outbound ICMP to 8.8.8.8 is permitted. What is the most likely cause?
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
Incorrect DNS configuration on the workstation
DNS is used for name resolution; pinging by IP address does not require DNS.
B
Best answer
Missing default route on the router
A missing default route means the router does not know where to send packets destined for external networks, causing failure to reach public IPs.
C
Distractor review
Duplicate IP address on the local network
A duplicate IP would cause intermittent connectivity issues but would still typically allow pinging the gateway; the symptoms described point to a routing issue.
D
Distractor review
Proxy server configuration is required
Proxy servers are used for application-layer traffic (HTTP/HTTPS), not for ICMP ping; ping does not go through a proxy.
Common exam trap
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Technical deep dive
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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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?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: Missing default route on the router — The ability to ping the default gateway indicates the local network and IP configuration are working. The failure to reach a public IP suggests the router (default gateway) does not have a route to the internet, or the external network is unreachable. A missing default route on the router is a common cause because the router knows about the local network but not how to forward traffic to the internet.
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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