(Part 1/3) Modules 1 – 2: OSPF Concepts and Configuration

1. What is a function of OSPF hello packets?

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• • to send specifically requested link-state records

  
  

• • to discover neighbors and build adjacencies between them

  
  

• • to ensure database synchronization between routers

  
  

• • to request specific link-state records from neighbor routers

  
  

2. Which OPSF packet contains the different types of link-state advertisements?

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• hello

• DBD

• LSR

• • LSU

• LSAck

3. Which three statements describe features of the OSPF topology table? (Choose three.)

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• • It is a link-state database that represents the network topology.

• • Its contents are the result of running the SPF algorithm.

  
  

• • When converged, all routers in an area have identical topology tables.

• • The topology table contains feasible successor routes.

  
  

• The table can be viewed via the show ip ospf database command

4. What does an OSPF area contain?

• • routers that share the same router ID

  
  

• • routers whose SPF trees are identical

  
  

• • routers that have the same link-state information in their LSDBs

  
  

• • routers that share the same process ID

  
  

5. What is used to facilitate hierarchical routing in OSPF?

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• • the use of multiple areas

• • frequent SPF calculations

  
  

• • autosummarization

  
  

• • the election of designated routers

  
  

6. Which OSPF data structure is identical on all OSPF routers that share the same area?

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• • forwarding database

• • link-state database

• • adjacency database

• • routing table

  
  

7. Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router?

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• • builds the topology table

• • exchanges link-state advertisements

• • chooses the best path

• • executes the SPF algorithm

8. A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected?

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• • The dead interval will not change from the default value.

  
  

• • The dead interval will now be 30 seconds.

  
  

• • The dead interval will now be 60 seconds.

• • The dead interval will now be 15 seconds.

  
  

9. 9. Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers?

   
   

• • R1 automatically adjusts its own timers to match the R2 timers.

• The R1 dead timer expires between hello packets from R2.

• • The hello timer on R2 expires every ten seconds.

• • The neighbor adjacency has formed.

10. To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which two values in the hello packets must match on both routers? (Choose two.)

• dead interval

• router priority

• hello interval

• list of neighbors

• router ID