CCNA - Cisco Certified Network Associate Practice Questions: IP Connectivity Domain

Published: June 22, 2025 | 20 min read

Test your CCNA - Cisco Certified Network Associate knowledge with 10 practice questions from the IP Connectivity domain. Includes detailed explanations and answers.

CCNA - Cisco Certified Network Associate Practice Questions

Master the IP Connectivity Domain

Test your knowledge in the IP Connectivity domain with these 10 practice questions. Each question is designed to help you prepare for the CCNA - Cisco Certified Network Associate certification exam with detailed explanations to reinforce your learning.

Question 1

A network administrator is configuring a router with the following command: 'router ospf 1'. What is the significance of the number '1' in this command?

A) It specifies the OSPF area number.

B) It specifies the OSPF process ID.

C) It specifies the OSPF priority.

D) It specifies the OSPF cost.

Show Answer & Explanation

Correct Answer: B

Explanation: CORRECT: The number '1' specifies the OSPF process ID, which identifies the OSPF instance on the router. Area numbers are specified in network statements, not the process ID. Correctly identifies the number as the OSPF process ID. OSPF priority is configured per interface, not in the router command. OSPF cost is configured per interface, not in the router command.

Question 2

A switch is configured with multiple VLANs. A host connected to VLAN 10 cannot communicate with a host in VLAN 20. What could be the issue?

A) The switch does not have a trunk port configured.

B) The hosts are not in the same VLAN.

C) The switch does not have a default gateway configured.

D) Inter-VLAN routing is not configured.

Show Answer & Explanation

Correct Answer: D

Explanation: CORRECT: Inter-VLAN routing is necessary for communication between different VLANs. A trunk port is needed for VLAN traffic between switches, but not within a single switch. The problem is related to communication between different VLANs, not within the same VLAN. A default gateway is not required for inter-VLAN communication within the same network. Without inter-VLAN routing, hosts in different VLANs cannot communicate.

Question 3

You are trying to configure inter-VLAN routing on a router-on-a-stick setup. After configuring the subinterfaces, hosts still cannot communicate between VLANs. What could be the cause?

A) The trunk port on the switch is not properly configured.

B) The subinterfaces lack IP addresses.

C) The router does not have a default route.

D) VLANs are not allowed on the trunk interface.

Show Answer & Explanation

Correct Answer: A

Explanation: In a router-on-a-stick configuration, the switch port connecting to the router must be configured as a trunk to carry multiple VLANs. Without this, inter-VLAN communication will fail. B is incorrect because subinterfaces typically have IP addresses if configured but this is not the main issue here. C is incorrect as a default route is not necessary for local inter-VLAN routing. D is part of the trunk configuration but it's closely related to A as both deal with trunk settings.

Question 4

You are tasked with configuring a router to prevent routing loops in a network using EIGRP. Which feature should you enable to achieve this?

A) Split horizon

B) Route poisoning

C) Hold-down timers

D) Route summarization

Show Answer & Explanation

Correct Answer: A

Explanation: Split horizon prevents routing loops by not allowing a route learned on an interface to be advertised back out of that same interface.

Question 5

After configuring OSPF on a multi-access network segment, you notice that all routers on the segment have established OSPF neighbor relationships except one. What could be the reason for this issue?

A) The router has a mismatched OSPF router ID.

B) The network type is mismatched on the router.

C) The router's OSPF priority is set higher than others.

D) The router is in a different OSPF area.

Show Answer & Explanation

Correct Answer: B

Explanation: Mismatched network types can prevent OSPF neighbors from forming on multi-access links. A mismatched OSPF router ID (A) does not affect adjacency formation. Priority (C) affects DR/BDR selection but not adjacency. A different OSPF area (D) would prevent adjacency on the same segment, but typically all routers should be configured with the same area if they are on the same link.

Question 6

Which command would you use to verify the default gateway configured on a Cisco switch?

A) show ip route

B) show ip default-gateway

C) show running-config

D) show ip interface brief

Show Answer & Explanation

Correct Answer: C

Explanation: The 'show running-config' command displays the current configuration, including the default gateway setting.

Question 7

A network engineer is troubleshooting an OSPF adjacency issue. They find that the OSPF hello and dead intervals are mismatched between two routers. What effect does this have?

A) The routers will form an adjacency but will not exchange routes.

B) The routers will form an adjacency but will have intermittent connectivity.

C) The routers will not form an adjacency.

D) The routers will form an adjacency with a delay.

Show Answer & Explanation

Correct Answer: C

Explanation: CORRECT: Mismatched hello and dead intervals prevent OSPF routers from forming an adjacency. Adjacency will not form with mismatched intervals. Adjacency will not form, so connectivity will not exist. Adjacency will not form at all, regardless of time.

Question 8

A company has multiple subnets. To route between these subnets, which type of routing is MOST appropriate?

A) Static Routing

B) Default Routing

C) Dynamic Routing

D) Direct Routing

Show Answer & Explanation

Correct Answer: C

Explanation: Dynamic routing protocols (like OSPF, EIGRP) automatically learn and adapt to changes in network topology, making them ideal for larger networks with multiple subnets. Static routing requires manual configuration for every route and is not scalable.

Question 9

During a network audit, you observe that a router is configured with both static and dynamic routes to a specific destination. Under normal circumstances, which route will the router prefer?

A) The route with the longest prefix match.

B) The static route.

C) The route learned via EIGRP.

D) The route with the lowest metric.

Show Answer & Explanation

Correct Answer: B

Explanation: Static routes have an administrative distance of 1, which is lower than any dynamic routing protocols, making them preferred over dynamic routes unless overridden by a specific configuration. Option A is not applicable unless the prefix lengths differ. Option C is incorrect unless the static route is not available. Option D is incorrect as metrics are considered after administrative distance.

Question 10

When configuring EIGRP, what does the 'variance' command do?

A) Adjusts the bandwidth for a given route

B) Specifies a backup route

C) Allows load balancing over multiple paths of unequal cost

D) Defines the maximum number of hops allowed

Show Answer & Explanation

Correct Answer: C

Explanation: The 'variance' command in EIGRP allows the router to load balance traffic across multiple paths that differ in cost, by a factor specified by the 'variance' value.

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About CCNA - Cisco Certified Network Associate Certification

The CCNA - Cisco Certified Network Associate certification validates your expertise in ip connectivity and other critical domains. Our comprehensive practice questions are carefully crafted to mirror the actual exam experience and help you identify knowledge gaps before test day.