Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeDrag and drop the following steps into the correct order to configure a Cisco switch as a DHCP relay agent with DHCP snooping, where the DHCP server is located on a remote router.
Explanation: First, the DHCP server must be properly configured on the router. Next, DHCP snooping is enabled globally on the switch to protect against rogue servers. Then, the specific client VLANs must be added to the snooping database. After that, the uplink interface to the DHCP server must be trusted to allow legitimate server responses. Finally, the ip helper-address command is placed on the client's SVI to forward DHCP broadcasts to the remote server.
A network engineer notices that internal hosts (192.168.1.0/24) can reach external servers on the internet, but replies from external servers never reach the internal hosts. The router R1 is configured with dynamic NAT to translate the internal subnet to a pool of public IPs (203.0.113.10-203.0.113.20). The engineer runs 'show ip nat translations' and sees only a few stale translations. What is the most likely cause of the issue?
Explanation: The 'ip nat outside' command must be applied to the interface facing the external network (GigabitEthernet0/0) for the router to translate return traffic. Without it, the router does not perform NAT on packets arriving on that interface, so replies from external servers are forwarded without translation back to the inside local IPs, which are not routable on the internet. The stale translations indicate that outbound translations were created but never used for return traffic, confirming the missing outside interface command.
A network administrator is troubleshooting a wireless connectivity issue in a large office. Users on the 5 GHz band report intermittent disconnections and slow performance, while 2.4 GHz clients are unaffected. The office uses a Cisco 9800 WLC with APs that support 802.11ac Wave 2. The administrator checks the WLC's RF profile and notices a high number of channel utilization reports on channel 36. What is the most likely cause of the problem?
Explanation: Channel 36 is a 20 MHz channel in the 5 GHz band. When many APs use the same channel (channel 36), they share the same medium, leading to co-channel interference (CCI). This causes intermittent disconnections and slow performance for 5 GHz clients because they must contend for airtime. Spreading APs across non-overlapping channels like 40, 44, or 48 reduces CCI and improves performance.
Drag and drop the following steps into the correct order to configure a switch port for data and voice traffic.
Explanation: The correct order is: 1) Enter interface configuration mode, because all port-specific commands must be applied under the interface. 2) Set the port as an access port with 'switchport mode access'—a voice VLAN can only be assigned on an access port. 3) Assign the data VLAN with 'switchport access vlan' to ensure proper Layer 2 forwarding for data traffic. 4) Assign the voice VLAN with 'switchport voice vlan' so the IP phone's voice frames are tagged with the voice VLAN. 5) Enable PortFast with 'spanning-tree portfast' to immediately transition the port to forwarding, preventing DHCP timeouts for the phone and host.
A network administrator is troubleshooting an IPv6 connectivity issue on a newly deployed router. The router's G0/0/0 interface is configured with an IPv6 address using EUI-64, but hosts on that subnet cannot reach the router's link-local address. The administrator runs 'show ipv6 interface g0/0/0' and sees that the interface is up/up but the IPv6 address is not in the expected format. What is the most likely cause of the problem?
Explanation: The router's G0/0/0 interface is up/up, but the IPv6 address is not in the expected EUI-64 format. This indicates that the 'ipv6 address' command was likely omitted entirely, because if it were simply misconfigured (e.g., without the `eui-64` keyword), the router would still automatically generate a link-local address, and hosts would be able to reach it. Since hosts cannot reach the link-local address, IPv6 is not enabled on the interface at all. The correct configuration requires the `ipv6 address` command with the appropriate prefix and the `eui-64` keyword.
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Practice all Which Command Should the Administrator Use Practice QuestionsPractise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command. These appear throughout the 200-301 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 200-301. Practicing each scenario type ensures you're ready for any format.
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