Cisco Implementing Cisco Enterprise Advanced Routing and Services Exam Practice Test
The 300-410 ENARSI practice page focuses on advanced enterprise routing and services. Its question bank samples routing behavior and route selection, including OSPF network types, EIGRP backup paths, policy-based routing, route redistribution, and longest-prefix matching. Other scenarios address QoS, NTP, multicast addressing, static-route behavior, and administrative authentication.
Exam overview
About the Cisco Implementing Cisco Enterprise Advanced Routing and Services Exam
The questions prompt you to interpret routing and service configurations and predict their operational effects. You may need to distinguish an OSPF point-to-point link from a network type that elects a designated router, or determine how an EIGRP feasible successor supports convergence after a path failure. Route-selection scenarios reinforce longest-prefix matching and the role of a floating static route. Redistribution questions call for recognizing how route tags or filtering can limit feedback between protocols; policy-based routing scenarios test when traffic should follow a policy-selected next hop. Service questions connect QoS policing or shaping behavior with traffic control, NTP synchronization with consistent event timelines, multicast addresses with protocol functions, and RADIUS with centralized login authentication. These skills map to practical work investigating reachability, controlling routing behavior, and validating services on enterprise routers.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
An OSPF network has a point-to-point Ethernet link between two routers. Which OSPF network type avoids electing a designated router on that link?
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Correct answer: COn an OSPF point-to-point network, the two routers form an adjacency without a designated-router or backup-designated-router election. This network type is commonly used on links that connect exactly two routers.
An engineer configures a router to send selected traffic to a different next hop based on policy rather than relying solely on the destination routing table. Which feature is intended for this purpose?
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Correct answer: APolicy-based routing allows forwarding decisions to be influenced by configured policies, such as source address or other packet attributes, instead of using only the destination-based routing lookup.
A router's forwarding table has a route for 10.20.0.0/16 and a more-specific route for 10.20.8.0/24. A packet is destined for 10.20.8.50. Which route is selected by longest-prefix matching?
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Correct answer: ALongest-prefix matching selects the route whose prefix matches the greatest number of leading destination bits. The /24 route is more specific than the /16 and contains 10.20.8.50, so it is selected.
A router running EIGRP has a feasible successor for a destination in its topology table. What is the main operational advantage of that route?
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Correct answer: AA feasible successor is a qualifying loop-free backup route. If the current successor fails, EIGRP can use the feasible successor without first performing a full diffusing computation for that destination.
A router is configured to redistribute routes from one routing protocol into another. Which practice helps reduce the risk of routes being redistributed back and forth between the protocols?
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Correct answer: ARedistribution can create feedback loops when routes move between protocols and are later reintroduced. Route tags and explicit filtering policies can identify such routes and prevent them from being redistributed back into their origin protocol.
A router is configured as an NTP client for network time synchronization. What is a key operational benefit of synchronized time across network devices?
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Correct answer: AConsistent time helps correlate logs, alarms, and events across devices, which supports troubleshooting and incident analysis. NTP synchronizes clocks but does not replace routing or provide packet encryption.
A router has a static route configured with the keyword that makes it a fallback only when a dynamic route is unavailable. What is this route commonly called?
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Correct answer: AA floating static route is configured with an administrative distance higher than the competing route, so it is normally used only when the preferred route is absent.
How to use this practice test
Access is free. Start a session to receive up to 20 random questions from the 300-410 ENARSI practice bank; the set can vary between sessions. Results appear after you finish, so use them to identify specific gaps—for example, route selection, redistribution safeguards, or QoS behavior—and revisit those concepts before another attempt.
Preparation tips
- Compare OSPF network types on Ethernet links, including whether the design elects a designated router and how point-to-point behavior changes adjacency expectations.
- Trace EIGRP successor and feasible-successor selection; explain how a backup path can support rapid recovery without a fresh route computation.
- Work through route-selection cases using longest-prefix matching, administrative distance, floating static routes, and policy-based routing, keeping each mechanism distinct.
- Practice redistribution designs with route tagging or filtering to prevent routes from returning to their source protocol, and check how the policy affects reachability.
- Review the operational purpose of QoS rate control, NTP synchronization, IPv4 multicast groups, and RADIUS authentication in router administration.