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N10-009 Router R1 Cannot Reach R3 Practice Questions

Use this page to practise N10-009 Router R1 Cannot Reach R3 Practice Questions practice questions. The goal is not to memorise dumps, but to understand the concept, review the explanation and improve your exam readiness.

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15
scenario questions
N10-009
exam code
CompTIA
vendor

Scenario guide

How to approach router r1 cannot reach r3 practice questions

Practise routing and connectivity troubleshooting scenarios involving R1, R2, R3, static routes, OSPF, next hops and routing tables.

Quick answer

Router R1 Cannot Reach R3 Practice Questions questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

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Practice set

Practice scenarios

Question 1mediummultiple choice
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A network engineer is implementing OSPF on a router. All directly connected neighbors are listed with state FULL, but routes from another area are not appearing in the routing table. Which of the following is the most likely cause?

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Question 2hardmultiple choice
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A network engineer has successfully established an IPsec site-to-site VPN tunnel between a branch office (10.0.1.0/24) and the main office (192.168.1.0/24). The tunnel status shows as active, and both sides can ping each other's tunnel interface IP addresses. However, users at the branch office cannot ping the main office server at 192.168.1.10, and the main office cannot ping the branch office server at 10.0.1.10. The firewall rules on both sides permit IPsec traffic and all internal traffic. What should the engineer check NEXT?

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Question 3hardmultiple choice
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A user reports intermittent inability to access websites. When the issue occurs, the user can ping external IP addresses (e.g., 8.8.8.8) but cannot ping domain names like google.com. The user's IP configuration shows a DNS server address of 8.8.8.8. What is the most likely cause?

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Question 4hardmultiple choice
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A network engineer has established an IPsec VPN tunnel between a branch office (10.0.0.0/24) and the main office (192.168.10.0/24). The tunnel shows as up and active, but users at the branch office cannot ping the main office server at 192.168.10.10. The main office can ping the branch office gateway successfully. What is the most likely cause of this issue?

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Question 5hardmultiple choice
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A network administrator is configuring OSPF on routers in a multi-area network. The administrator wants to ensure that a router in area 1 does not learn external routes (Type 5 LSAs) injected by an ASBR in area 0, but it must still learn inter-area routes (Type 3 LSAs). The administrator wants to reduce the routing table size. Which OSPF area type should be configured for area 1?

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Question 6hardmultiple choice
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A network administrator is concerned about DHCP security. To prevent rogue DHCP servers from offering incorrect IP addresses, the administrator enables DHCP snooping on the switches. Additionally, the administrator wants to prevent DHCP starvation attacks that exhaust the DHCP pool. Which feature should be enabled on the switch to specifically mitigate DHCP starvation?

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Question 7hardmultiple choice
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A network administrator is configuring OSPF on a router that has interfaces in only one area and does not perform route redistribution. Which OSPF router type best describes this router?

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Question 8hardmultiple choice
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A network administrator configures a router to send syslog messages to a central log server. The administrator can ping the server from the router, but the server is not receiving any logs. What is the most likely cause?

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Question 9hardmultiple choice
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A network technician is troubleshooting connectivity between two branch offices connected by a site-to-site VPN. The VPN tunnel shows as active and up. Users at Branch A can ping the VPN gateway IP at Branch B successfully, but they cannot access any servers behind the firewall at Branch B. The firewall at Branch B is stateful and its logs show that traffic from Branch A is being dropped. What is the most likely cause?

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Question 10mediummultiple choice
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A router receives a packet destined for 10.0.0.15. It has the following routes in the routing table: 10.0.0.0/8 via 192.168.1.1, 10.0.0.0/16 via 192.168.2.1, 0.0.0.0/0 via 192.168.3.1. Which route will be used?

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Question 11mediummultiple choice
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A router has two routes to the same destination network: one learned via OSPF with a metric of 10, and another learned via EIGRP with a composite metric of 3072. The default administrative distances are OSPF=110, EIGRP=90. Which route will be installed in the routing table?

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Question 12hardmultiple choice
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A network technician is troubleshooting an intermittent connectivity issue between two switches connected via fiber optic cable. The link status shows up/down flapping. The technician checks the optical power levels and finds they are within acceptable range. Which of the following is the most likely cause?

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Question 13mediummultiple choice
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A network technician is troubleshooting intermittent internet access for a single user. The user’s workstation can ping the default gateway consistently, but web pages fail to load intermittently. Which of the following should the technician check NEXT?

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Question 14mediummultiple choice
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A technician is troubleshooting a user's inability to access the internet. The user can successfully ping the default gateway and internal servers, but cannot ping a public IP address such as 8.8.8.8. The technician checks the firewall logs and confirms that outbound ICMP traffic to 8.8.8.8 is permitted. Which of the following is the most likely cause of the issue?

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Question 15hardmultiple choice
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A user at a branch office reports that they cannot connect to a file server at the main office. The branch office connects to the main office via a site-to-site VPN, and the VPN tunnel shows as active. The user can ping the main office's default gateway but not the file server. Which of the following should the technician check NEXT?

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