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Networking Midterms
Midterms
| Question | Answer |
|---|---|
| 1. What is a function of OSPF hello packets? | to discover neighbors and build adjacencies between them |
| 2. Which OSPF packet contains the different types of link-state advertisements? | LSU |
| 3. Which three statements describe features of the OSPF topology table? (Choose three.) | It is a link-state database that represents the network topology. When converged, all routers in an area have identical topology tables. The table can be viewed via the show ip ospf database command. |
| 4. What does an OSPF area contain? | routers that have the same link-state information in their LSDBs |
| 5. What is used to facilitate hierarchical routing in OSPF? | the use of multiple areas |
| 6. Which OSPF data structure is identical on all OSPF routers that share the same area? | link-state database |
| 7. Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router? | exchanges link-state advertisements |
| 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? | The dead interval will now be 60 seconds. |
| 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? | The R1 dead timer expires between hello packets from R2. |
| 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.) | hello interval dead interval |
| 11. What is the default router priority value for all Cisco OSPF routers? | 1 |
| 12. Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to check against the local LSDB? | database description |
| 13. In an OSPF network when are DR and BDR elections required? | when the routers are interconnected over a common Ethernet network |
| 14. When an OSPF network is converged and no network topology change has been detected by a router, how often will LSU packets be sent to neighboring routers? | every 30 minutes |
| 15. What will an OSPF router prefer to use first as a router ID? | any IP address that is configured using the router-id command |
| 16. What are the two purposes of an OSPF router ID? (Choose two.) | to uniquely identify the router within the OSPF domain to facilitate router participation in the election of the designated router |
| 17. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID? | 192.168.1.100 |
| A network technician issues the following commands when configuring a router: | the OSPF process ID on R1 |
| 19. An OSPF router has three directly connected networks; 172.16.0.0/16, 172.16.1.0/16, and 172.16.2.0/16. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors? | router(config-router)# network 172.16.1.0 255.255.255.0 area 0 |
| 20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.) | R3 will be elected BDR. The R4 router ID is 172.16.1.1. R2 will be elected DR. |
| 21. Refer to the exhibit. If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR? | Router R4 will become the DR and router R1 will become the BDR. |
| 22. By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater? | 1 |
| 23. Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/24 from B? | 65 |
| 24. Refer to the exhibit. On which router or routers would a default route be statically configured in a corporate environment that uses single area OSPF as the routing protocol? | R0-A |
| 25. What command would be used to determine if a routing protocol-initiated relationship had been made with an adjacent router? | show ip ospf neighbor |
| 26. Refer to the exhibit. Which command did an administrator issue to produce this output? | R1# show ip ospf interface serial0/0/1 |
| 27. Which command is used to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network? | show ip protocols |
| 28. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem? | Interface Fa0/0 has not been activated for OSPFv2 on router R2. |
| 29. What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues? | Configure a value using the router-id command. |
| 30. Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination? | executing the SPF algorithm |
| 31. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.223.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.1.255 |
| 32. What is the format of the router ID on an OSPF-enabled router? | a 32-bit number formatted like an IPv4 address |
| 33. Question as presented: | |
| 34. After modifying the router ID on an OSPF router, what is the preferred method to make the new router ID effective? | HQ# clear ip ospf process |
| 35. In an OSPFv2 configuration, what is the effect of entering the command network 192.168.1.1 0.0.0.0 area 0 ? | It tells the router which interface to turn on for the OSPF routing process. |
| 36. What is the reason for a network engineer to alter the default reference bandwidth parameter when configuring OSPF? | to more accurately reflect the cost of links greater than 100 Mb/s |
| 37. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. | Change the subnet mask of interface FastEthernet 0/0 to 255.255.255.0. |
| 38. Match the description to the term. (Not all options are used.) | the algorithm used by OSPF -> Shortest Path First where details of the neighboring routers can be found = Adjacency database All routers are in the backbone area = Single-area OSPF where you can find the topology table = Link-state database |
| 39. What is a benefit of multiarea OSPF routing? | Topology changes in one area do not cause SPF recalculations in other areas. |
| 40. Match the OSPF state with the order in which it occurs. (Not all options are used.) | 2nd - Init state 7th - Full state 5th - Exchange state 1st - Down state 4th - Exstart state 3rd - Two-way state 6th - Loading state |
| 41. What indicates to a link-state router that a neighbor is unreachable? | if the router no longer receives hello packets |
| 42. Which three OSPF states are involved when two routers are forming an adjacency? (Choose three.) | Init Two-way Down |
| 43. Refer to the exhibit. Suppose that routers B, C, and D have a default priority, and router A has a priority 0. Which conclusion can be drawn from the DR/BDR election process? | If the DR fails, the new DR will be router B. |
| 44. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 64.102.0.0 255.255.255.128. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.0127 |
| 45. Which command will a network engineer issue to verify the configured hello and dead timer intervals on a point-to-point WAN link between two routers that are running OSPFv2? | show ip ospf interface serial 0/0/0 |
| 46. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 128.107.0.0 255.255.255.192. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.0.63 |
| 47. Match each OSPF packet type to how it is used by a router. (Not all options are used.) | link-state request packet - query a router for additional information hello packet - establish/maintain adjacencies database description packet - compare topology to that sent by another router link-state update packet - advertise new information |
| 48. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.181.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.1.255 |
| 49. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 198.19.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.3.255 |
| 50. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 128.107.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.3.255 |
| 51. Which step in the link-state routing process is described by a router flooding link-state and cost information about each directly connected link? | exchanging link-state advertisements |
| 52. Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces? | establishing neighbor adjacencies |
| 53. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 64.100.0.0 255.255.255.0. What wildcard mask would the administrator use in the OSPF network statement? | 0.0.0.255 |
| 54. Which step in the link-state routing process is described by a router inserting best paths into the routing table? | choosing the best route |
| 55. What type of address is 64.101.198.197? | public |
| 56. An OSPF router has three directly connected networks; 172.16.0.0/24, 172.16.1.0/24, and 172.16.2.0/24. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors? | router(config-router)# network 172.16.1.0 0.0.0.255 area 0 |
| 57. Which step in the link-state routing process is described by a router building a link-state database based on received LSAs? | building the topology table |
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