Describe the Operation and Behavior of Single Area Open Shortest Path First POWERSWITCH-CAMPUS-DEPLOY Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   During OSPF database synchronization, a router receives a Database Description (DBD) packet from a neighbor. The DBD packet contains a summary of the neighbor's link-state database. What does the receiving router do with this information?

   • AIt discards the DBD and waits for the neighbor to send the full LSAs.
   • BIt compares the DBD with its own database and sends Link-State Requests (LSRs) for any LSAs it does not have or that are newer.
   • CIt runs the SPF algorithm immediately to update its routing table.
   • DIt immediately adds all LSAs from the DBD to its own database.
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2. 17foundation · easy

   In a single-area OSPF design, what is the purpose of using Area 0?

   • AArea 0 is the backbone area that all other areas must connect to in multi-area designs, but in a single-area design it simply contains all routers.
   • BArea 0 is used only for external route redistribution.
   • CArea 0 is a special area that does not require a designated router.
   • DArea 0 is used to isolate OSPF routing from other routing protocols.
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4. 18application · medium

   An OSPF network has a topology change, and a router needs to recalculate its routing table. The router has already synchronized its link-state database with all neighbors. What is the next step the router performs?

   • ARun the SPF algorithm to compute the shortest path tree from the updated link-state database.
   • BFlood the new LSA to all routers in the area before running SPF.
   • CSend a new Hello packet to all neighbors to re-establish adjacencies.
   • DWait for the dead interval to expire before recalculating routes.
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5. 19application · medium

   A network engineer is configuring OSPF on two directly connected Dell PowerSwitch switches. The engineer sets the hello interval to 5 seconds on one switch but leaves the default hello interval on the neighbor switch. After several minutes, the OSPF neighbor relationship fails to establish. What is the most likely cause of this failure?

   • AThe hello and dead intervals must match exactly between OSPF neighbors for an adjacency to form.
   • BThe dead interval on the neighbor switch is too short to accommodate the 5-second hello interval.
   • CThe interface type must be changed to point-to-point to support a 5-second hello interval.
   • DThe router ID of the switch with the 5-second hello interval conflicts with the neighbor's router ID.
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6. 20expert · hard

   A network engineer is designing an OSPF network with two paths between core routers: a 1 Gbps path with a cost of 100 and a 10 Gbps path with a cost of 10. The engineer wants to ensure that the 10 Gbps path is always preferred, even if the 1 Gbps path has a lower hop count. What should the engineer do to guarantee this preference?

   • AIncrease the reference bandwidth to 10000 Mbps.
   • BSet the OSPF cost of the 10 Gbps interface to 1 and the 1 Gbps interface to 100.
   • CChange the OSPF network type to point-to-point on both paths.
   • DUse the 'ip ospf cost' command to set the cost of the 1 Gbps interface to 1000.
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