Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeAn enterprise is migrating from a traditional MPLS WAN to Cisco SD-WAN. The network team has deployed vEdge routers at all branch offices and a vSmart controller in the data center. The engineer configures a centralized control policy to influence path selection based on cost and latency. After the policy is activated, the engineer notices that some branches are not receiving the updated policy and are still using the default best-path selection. The vSmart is reachable from all branches, and the vEdge routers show that they are connected to the vSmart. What is the most likely reason for this issue?
Explanation: In Cisco SD-WAN, centralized control policies must be explicitly attached to a site list or VPN list to define which devices or traffic the policy applies to. If the policy is not attached to the appropriate list, the vSmart controller will not push the policy to the targeted vEdge routers, causing them to continue using the default OMP best-path selection (based on administrative distance and cost). The fact that the vEdge routers are connected to the vSmart confirms the issue is with policy application, not reachability.
Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.
Explanation: VTP requires setting mode and domain before trunking works; verification confirms operation.
A network engineer is configuring EIGRP on a router that connects to a service provider network. The engineer wants to advertise a default route to internal routers. The engineer configures 'ip default-network 0.0.0.0' and redistributes a static default route into EIGRP. However, internal routers are not receiving the default route. The engineer checks the EIGRP topology table and sees the default route with a metric of 1. What is the most likely reason?
Explanation: The engineer's configuration includes both 'ip default-network 0.0.0.0' (which is an IGRP command, not EIGRP) and redistribution of a static default route. The appearance of the default route in the EIGRP topology table with metric 1 indicates that redistribution occurred, but the route is not being advertised to internal routers. The most likely reason is that the static default route itself is not correctly configured. For EIGRP redistribution to succeed, the static route must point to a valid next-hop IP address using the syntax 'ip route 0.0.0.0 0.0.0.0 <next-hop>'. If the engineer used an interface instead of a next-hop, or the next-hop is unreachable, the static route may be invalid or not installed in the routing table, preventing its advertisement to EIGRP neighbors.
An engineer uses the following Ansible playbook to configure an interface on a Cisco IOS-XE device using the cisco.ios.ios_interfaces module: ```yaml --- - name: Configure interface hosts: cisco-routers gather_facts: no tasks: - name: Set interface description cisco.ios.ios_interfaces: config: - name: GigabitEthernet0/1 description: "Uplink to Core" enabled: true state: replaced ``` What is the result of running this playbook?
Explanation: The 'state: replaced' will replace the entire interface configuration with only the provided parameters. This means that any existing configuration on GigabitEthernet0/1 (like IP address, speed, duplex) will be removed and only the description and enabled state will be applied. This is a common pitfall.
A network administrator is troubleshooting a BGP routing issue where routes from an eBGP neighbor are not being installed in the routing table. The 'show ip bgp' output shows the routes are received but not valid. What is the most likely cause?
Explanation: For a BGP route to be considered valid and installed in the routing table, the next-hop IP address must be reachable via an IGP or a static route. If the next hop is not reachable, the route will appear in the 'show ip bgp' output but will be marked as not valid (often with a 'r' for received but not valid). This is the most common cause when routes are received from an eBGP neighbor but not installed.
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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 350-401 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 350-401. Practicing each scenario type ensures you're ready for any format.
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