Practise exhibit-style questions that ask you to read a topology, table, command output or diagram before choosing the best answer.
Start Scenario PracticeAn engineer redistributes OSPF routes into EIGRP. The OSPF routes have a metric of 20. After redistribution, the EIGRP topology table shows the routes but they are not installed in the routing table. The 'show ip eigrp topology' shows the route in active state. Which is the most likely explanation?
Explanation: When redistributing into EIGRP, a seed metric must be specified. If not, the routes are redistributed with an infinite metric (e.g., 4294967295) and are not installed. However, the question says the route is in active state, which indicates a query is pending. This is an edge case where the route is redistributed with a valid metric but the EIGRP process is stuck-in-active due to a unidirectional link or a neighbor not replying to queries.
EIGRP network is experiencing stuck-in-active (SIA) routes. Router R1 shows: show ip eigrp topology active includes 10.0.0.0/24. Router R2 has: interface GigabitEthernet0/0, ip summary-address eigrp 100 10.0.0.0 255.255.255.0. What is the root cause?
Explanation: The summary address configured on R2 (ip summary-address eigrp 100 10.0.0.0 255.255.255.0) causes R2 to advertise a single summary route (10.0.0.0/24) to R1. When R1 loses its route to 10.0.0.0/24 and sends a query for the specific prefix, R2 does not reply because the summary address suppresses the query for the more specific route, leaving R1 stuck-in-active (SIA) waiting for a reply that never comes.
An engineer configures EIGRP named mode on a router. A route is learned via EIGRP, but the router does not install it in the routing table. The show ip eigrp topology shows the route in passive state with a feasible distance. Which is the most likely explanation?
Explanation: In named mode, EIGRP uses address-family configuration. The route may be learned but not installed if the 'no ip route-cache' or 'no ip routing' is misconfigured, or if the route is suppressed by a route-map. However, a common edge case is that the route is an internal route but the router is configured as a stub with 'receive-only', which prevents installing any routes.
A network engineer is troubleshooting a route redistribution issue between two EIGRP processes. Router R1 runs EIGRP AS 100 and EIGRP AS 200, and redistributes routes between them. The engineer notices that routes from EIGRP AS 100 are not appearing in the EIGRP topology table of AS 200 on R1. The redistribute eigrp 100 command is configured under EIGRP AS 200. What is the most likely cause?
Explanation: When redistributing between EIGRP processes, the redistribute command must include the metric values (bandwidth, delay, reliability, load, MTU) or a default-metric must be configured. Without a metric, the redistributed routes are not accepted.
Which OSPF LSA type is flooded only within the originating area and is used for loop prevention by describing the topology of the area?
Explanation: Type 1 Router LSAs describe the router's links and are flooded only within the area. They provide topology information for loop prevention within the area.
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Practice all Refer to the Exhibit Practice QuestionsPractise exhibit-style questions that ask you to read a topology, table, command output or diagram before choosing the best answer. These appear throughout the 300-410 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 300-410. Practicing each scenario type ensures you're ready for any format.
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