This free Cisco CCNA Network Access practice test covers VLANs, trunking, EtherChannel, Spanning Tree Protocol, discovery protocols (CDP/LLDP), and wireless LAN access including WPA2/WPA3 for the CCNA 200-301. Each question includes a detailed explanation — perfect for Cisco CCNA 200-301 exam prep.
What is the default administrative distance for OSPF routes?
Correct answer: C
Explanation: OSPF (Open Shortest Path First) has a default administrative distance of 110. This is higher than EIGRP (90) but lower than RIP (120), making OSPF routes preferred over RIP but not over EIGRP.
Which spanning tree protocol provides the fastest convergence?
Correct answer: B
Explanation: RSTP (Rapid Spanning Tree Protocol) provides the fastest convergence, typically within seconds compared to the 30-50 seconds required by traditional STP. It achieves this through improved BPDU handling and port state transitions.
A network administrator is troubleshooting connectivity issues between VLAN 10 and VLAN 20. Both VLANs are configured on the same switch, but devices on VLAN 10 cannot ping devices on VLAN 20. What is the MOST likely cause?
Correct answer: B
Explanation: Inter-VLAN routing is required for communication between different VLANs on the same switch. Without a router or a Layer 3 switch with appropriate routing configurations (like a router on a stick or VLAN routing with subinterfaces), VLANs are isolated. A misconfigured DHCP server would affect IP address assignment, not connectivity between VLANs. An STP loop would cause a broadcast storm, not necessarily a complete connectivity outage between VLANs. The cable type is relevant only for the connection to individual devices within a VLAN, not inter-VLAN communication.
A network technician is configuring a trunk link between two Cisco switches. The trunk link must carry VLANs 10, 20, and 30. Which command is used to add these VLANs to the allowed VLAN list on the trunk port?
Correct answer: B
Explanation: The command `switchport trunk allowed vlan 10,20,30` explicitly defines the VLANs allowed on the trunk port. Option A configures the port as an access port, not a trunk port. Option C configures the encapsulation type for the trunk, which is necessary but doesn't add VLANs. Option D is used for access ports.
While implementing a new VLAN, a network administrator notices that some devices are experiencing connectivity issues. The switch shows STP is converging. Which protocol is MOST likely causing the convergence delay?
Correct answer: C
Explanation: STP (Spanning Tree Protocol) is the older, slower converging protocol. RSTP (Rapid Spanning Tree Protocol), MSTP (Multiple Spanning Tree Protocol), and PVST+ (Per-VLAN Spanning Tree Plus) are all faster-converging variants of STP. The slow convergence of STP is the likely cause of the connectivity issues.
A network engineer needs to implement EtherChannel between two switches to increase bandwidth. What is the first step in configuring EtherChannel?
Correct answer: C
Explanation: Before any configuration, the physical connection must be established. While LACP (Link Aggregation Control Protocol) is used for dynamic EtherChannel configurations, and VLAN assignment is relevant for the traffic carried over the channel, the physical connections must be in place before any configuration takes effect.
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