ccna practice test Practice Exam 2025: Latest Questions

A network administrator needs to divide the 192.168.1.0/24 network into 4 equal subnets. What subnet mask should be used?

Which spanning-tree port state allows a switch port to send and receive BPDUs but not forward user data?

An organization wants to implement a first-hop redundancy protocol that supports load balancing across multiple gateways. Which protocol should they use?

A network engineer is troubleshooting connectivity issues and executes the command 'show ip interface brief' on a router. The interface shows status 'up' and protocol 'down'. What is the most likely cause?

What is the primary purpose of the DHCP Discover message in the DHCP process?

A company wants to restrict SSH access to a router so that only the management subnet 10.10.10.0/24 can connect. Which configuration accomplishes this goal?

Which REST API HTTP method should be used to retrieve information from a network device without modifying any configuration?

A network has multiple OSPF routers in Area 0. Router A has a directly connected network 172.16.10.0/24, while Router B learns about network 192.168.5.0/24 via EIGRP and redistributes it into OSPF. What type of LSA does Router B generate for the 192.168.5.0/24 network?

A switch port is configured with 'switchport port-security maximum 2' and 'switchport port-security violation restrict'. What happens when a third MAC address attempts to send traffic through this port?

Which data format is characterized by using key-value pairs, is human-readable, and is commonly used in network automation with Ansible?

A network administrator needs to configure a switch port to automatically detect and provide power to an IP phone. Which feature should be enabled on the switch port?

An engineer is troubleshooting connectivity issues and executes the command 'show ip interface brief' on a router. The interface status shows 'up' but the protocol status shows 'down'. What is the most likely cause?

Which REST API method should be used to retrieve configuration information from a network device without making any changes?

A company has implemented port security on all access switches. An authorized user connects a small hub to access multiple devices from their desk. What will happen if the port security violation mode is set to 'restrict'?

What is the primary purpose of the DHCP Discover message in the DHCP process?

A network engineer needs to configure OSPF on a router with multiple interfaces. The router ID has not been manually configured. Which value will OSPF select as the router ID?

An administrator is configuring inter-VLAN routing using a router-on-a-stick topology. The physical interface is Gi0/0, and subinterfaces have been created for VLANs 10 and 20. Which command must be configured on each subinterface?

A security administrator wants to implement 802.1X authentication on the network. Which three components are required for 802.1X to function properly?

A network architect is designing a campus network and needs to select an EtherChannel protocol. The network uses switches from multiple vendors. Which protocol should be used to ensure compatibility?

A company's network uses both IPv4 and IPv6. The engineer notices that IPv6 routing is not working even though IPv6 addresses are configured on interfaces. What is the most likely cause?

A network administrator is configuring a Cisco router to provide automatic IP address assignment to hosts on the 192.168.10.0/24 network. Which command should be used to exclude the first 10 addresses from being assigned by the DHCP server?

A network engineer is troubleshooting connectivity issues and discovers that frames are being corrupted on a switchport. Upon inspection, the show interfaces command displays a high number of CRC errors. What is the most likely cause of this problem?

An organization wants to implement network automation using REST APIs to configure their Cisco devices. Which data format is most commonly used for exchanging structured data between REST API clients and Cisco network devices?

A company has implemented a new wireless network using WPA3-Enterprise authentication. Users are experiencing intermittent authentication failures. The network administrator discovers that some older devices cannot connect while newer devices work fine. What is the most likely explanation and solution?

A network architect is designing a solution for a large enterprise campus with multiple distribution layer switches. To provide optimal convergence time and prevent routing loops while maintaining multiple active paths for load balancing, which routing protocol and configuration approach should be implemented between the distribution and core layers?