Cisco 300-410 Practice Test

300-410 practice test: what's covered

• EIGRP
• OSPF
• BGP
• Redistribution
• MPLS/DMVPN
• Infra Security (ACL/AAA)
• SNMP/Syslog/NetFlow/IP SLA

Free 300-410 sample questions

1. An engineer migrates a hub router to EIGRP named mode and must apply a single authentication and timer configuration that is inherited by every interface in the autonomous system. Under which configuration sub-mode are these family-wide settings placed?

   • A. af-interface default
   • B. topology base
   • C. address-family ipv4 unicast only
   • D. router eigrp classic mode
   Show answer

   Correct: A. In EIGRP named mode, the 'af-interface default' sub-mode holds settings (timers, authentication, bandwidth-percent) inherited by all interfaces in that address-family. Per-interface overrides go under 'af-interface <name>'. The 'topology base' sub-mode handles route-control like summarization and offset-lists, not interface defaults.

2. A remote site router is connected only to the hub and should never be used as a transit path between two other routers. After configuring 'eigrp stub connected summary' on it, what behavior changes regarding EIGRP queries?

   • A. The hub no longer sends queries to the stub router because a stub advertises itself as a non-transit device
   • B. The stub router floods queries to all neighbors faster
   • C. The stub router becomes the query origin for the whole AS
   • D. Queries are converted to multicast hellos
   Show answer

   Correct: A. An EIGRP stub router signals it is not a transit path, so neighbors (the hub) stop sending queries to it during convergence. This bounds the query domain and prevents Stuck-In-Active conditions caused by far-end branches. Stub does not change hello behavior or make the router a query origin.

3. Show output reveals an EIGRP route stuck in the Active state (SIA) across a large hub-and-spoke topology. Which design change MOST directly reduces the query scope that causes SIA?

   • A. Configure spokes as EIGRP stub routers and summarize toward the spokes
   • B. Lower the hello interval on all spokes to 1 second
   • C. Disable split horizon on the hub mGRE interface
   • D. Increase the EIGRP variance to 4 on the hub
   Show answer

   Correct: A. SIA happens when queries propagate too far waiting for replies. Marking spokes as stubs stops queries from going to them, and summarization creates a query boundary (the router replying authoritatively for the summary). Variance affects unequal-cost load balancing, not query scope; faster hellos and disabling split horizon do not bound queries.

4. An engineer needs EIGRP to install up to four unequal-cost paths into the routing table where the worst path's metric is no more than twice the best feasible distance. Which command achieves this?

   • A. variance 2 (with maximum-paths set to at least 4)
   • B. maximum-paths 4 only
   • C. metric weights 0 2 0 0 0 0
   • D. bandwidth-percent 200
   Show answer

   Correct: A. Variance N installs feasible successors whose metric is within N times the best (successor) metric, enabling unequal-cost load balancing; maximum-paths caps how many. A candidate must still satisfy the feasibility condition. 'metric weights' changes the K-values, and bandwidth-percent limits EIGRP's link usage, neither enabling unequal-cost balancing.

5. Two OSPF routers on an Ethernet segment are stuck in EXSTART/EXCHANGE and never reach FULL. Pings of normal size succeed but large pings fail. What is the MOST likely cause?

   • A. An MTU mismatch between the two interfaces
   • B. Mismatched OSPF process IDs
   • C. Different OSPF router-IDs
   • D. One side is configured as a stub area
   Show answer

   Correct: A. OSPF neighbors compare interface MTU in DBD packets; a mismatch leaves them stuck in EXSTART/EXCHANGE even though Hellos (small) succeed. Process IDs are locally significant and never need to match. Router-ID conflicts or area mismatches cause different symptoms (no neighbor or area-mismatch logs), not the classic EXSTART loop tied to large-packet failures.

Last updated: 2026-10-19

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