CCNA v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers

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CCNA v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers
NOTE: If you have a new question on this test, please comment Question and Multiple-Choice list in form below this article. We will update answers for you in the shortest time. Thank you! We truly value your contribution to the website

Q1. What is the format of the router ID on an OSPF-enabled router?

  • a unique router host name that is configured on the router
  • a unique phrase with no more than 16 characters
  • a 32-bit number formatted like an IPv4 address
  • an 8-bit number with a decimal value between 0 and 255
  • a character string with no space

Q2. What is the reason for a network engineer to alter the default reference bandwidth parameter when configuring OSPF?

  • to force that specific link to be used in the destination route
  • to more accurately reflect the cost of links greater than 100 Mb/s
  • to enable the link for OSPF routing
  • to increase the speed of the link

Q3. Match the description to the term. (Not all options are used.)

CCNA 3 v7 Modules 1 - 2: OSPF Concepts and Configuration Exam Answers 10

Q4. In an OSPFv2 configuration, what is the effect of entering the command network 192.168.1.1 0.0.0.0 area 0 ?

  • It changes the router ID of the router to 192.168.1.1.
  • It allows all 192.168.1.0 networks to be advertised.
  • It tells the router which interface to turn on for the OSPF routing process.
  • It enables OSPF on all interfaces on the router.

Q5. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

CCNA 3 v7 Modules 1 - 2: OSPF Concepts and Configuration Exam Answers 9

Which task has to be performed on Router 1 for it to establish an OSPF adjacency with Router 2?

  • Issue the clear ip ospf process command.
  • Change the subnet mask of interface FastEthernet 0/0 to 255.255.255.0.
  • Remove the passive interface command from interface FastEthernet 0/0.
  • Add the network 10.0.1.0 0.0.0.255 area 0 command to the OSPF process.

Q6. After modifying the router ID on an OSPF router, what is the preferred method to make the new router ID effective?

  • HQ# copy running-config startup-config
  • HQ# clear ip ospf process
  • HQ# clear ip route *
  • HQ# resume

Q7. 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?

  • 0.0.31.255
  • 0.0.0.63
  • 0.0.63.255
  • 0.0.0.127

Q8. Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces?

  • injecting the default route
  • exchanging link-state advertisements
  • establishing neighbor adjacencies
  • electing the designated router

Q9. 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?

The graphic displays the following: Router R1 is connected to PC1 and has the IP address 192.168.10.254 on interface Fa0/0. PC1 has the IP address 192.168.10.1 /24. Router R1 S0/0 has IP address 192.168.20.1 /30 and is connected to router R2 on interface S0/0 with IP address 192.168.20.2 /30. Router R2 is connected to PC1 and has the IP address 192.168.30.254 on interface Fa0/0. PC2 has the IP address 192.168.30.1 /30. Below the topology is a router prompt and command, and some partial command output: R2# show ip protocols Routing Protocol is "ospf 99" Router ID 192.168.30.254 Maximum path: 4 Routing for Networks: 192.168.20.2 0.0.0.0 area 0 192.168.3.0 0.0.0.255 area 0 Passive Interface(s): FastEthernet0/0 Routing Information Sources: Gateway Distance Last Update 192.168.20.1 110 00:02:11 192.168.30.254 110 00:02:11 Distance: (default is 110)
  • Interface S0/0 is configured as a passive-interface on router R2.
  • Interface Fa0/0 is configured as a passive-interface on router R2.
  • Interface Fa0/0 has not been activated for OSPFv2 on router R2.
  • Interface s0/0 has not been activated for OSPFv2 on router R2.

Q10. What command would be used to determine if a routing protocol-initiated relationship had been made with an adjacent router?

  • show ip protocols
  • show ip interface brief
  • ping
  • show ip ospf neighbor

CCNA 3 v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers

Q11. 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?

Graphic Description The network consists of four OSPF routers connected to a single Ethernet LAN via a Layer 2 switch. All four routers are connected to the LAN, which is in network 10.0.0.0/16 Each router also has a loopback interface and a router ID as follows: router R1 loopback 0 IP address:192.168.1.100/32 Ethernet LAN IP address: 10.0.0.1/16 router ID: 1.1.1.1 priority = 2 router R2 loopback 0 IP address:192.168.2.100/32 Ethernet LAN IP address: 10.0.0.2/16 router ID: 2.2.2.2 priority = 2 router R3 loopback 0 IP address: 192.168.3.100/32 Ethernet LAN IP address: 10.0.0.3/16 router ID: 3.3.3.3 priority = 1 ROuter R4 Loopback 0 IP address is 192.168.4.100/32 Ethernet LAN IP address 10.0.0.4/16 router ID is 4.4.4.4 Priority = 1
  • Router R4 will become the DR and router R1 will become the BDR.
  • Router R2 will become the DR and router R3 will become the BDR.
  • Router R1 will become the DR and router R2 will become the BDR.
  • Router R4 will become the DR and router R3 will become the BDR.

Q12. Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/24 from B?

This graphic contains the following information: There are three routers labeled A, B, and C, which are connected to each other through serial links. A is connected to B through a 1544 Kbps serial link, and is connected to C through a 64 Kbps serial link. A is also connected to the LAN 172.16.1.0/24 through a Gigabit Ethernet interface G0/0. B is connected to C through a 1544 Kbps serial link. It is also connected to the LAN 172.16.2.0/24 through a Gigabit Ethernet interface G0/0. C is also connected to the LAN 172.16.3.0/24 through a Gigabit Ethernet interface G0/0.
  • 782
  • 74
  • 128
  • 65


Q13. 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.
  • Use the highest active interface IP address that is configured on the router.
  • Use a loopback interface configured with the highest IP address on the router.
  • Use the highest IP address assigned to an active interface participating in the routing process.

Q14. Refer to the exhibit. Which command did an administrator issue to produce this output?

The exhibit shows the following output: Serial0/0/1 is up, line protocol is up Internet Address 172.16.30.1/30, Area 0, Attached via Network Statement Process ID 10, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 64 Topology-MTID Cost Disabled Shutdown Topology Name 0 64 no no Base Transmit Delay is 1 sec, State POINT_TO_POINT Timer intervals configured, Hello 5, Dead 20, Wait 20, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:02 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 2/2, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 1 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 1.1.1.1 Suppress hello for 0 neighbor(s) Message digest authentication enabled Youngest key id is 1 R1#
  • R1# show ip ospf
  • R1# show ip route ospf
  • R1# show ip ospf interface serial0/0/1
  • R1# show ip ospf neighbor

Q15. What are the two purposes of an OSPF router ID? (Choose two.)

  • to facilitate the transition of the OSPF neighbor state to Full
  • to uniquely identify the router within the OSPF domain
  • to facilitate router participation in the election of the designated router
  • to enable the SPF algorithm to determine the lowest cost path to remote networks
  • to facilitate the establishment of network convergence

Q16. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID?

The graphic shows a network of two routers running OSPF connected in the following ways. Router Branch1 has the following interfaces configured: G0/0 is connected to a switch and a host. The IP address of G0/0 is 10.1.0.1/16. Another Ethernet interface is connected to router Branch2 with a switch in between. This interface IP is 10.0.0.1/16. There is a loopback interface with IP address 192.168.1.100, and there is a serial interface connected to the cloud with IP address 209.165.201.1/29 Router Branch2 has the following interfaces configured: There is an Ethernet interface connected to router Branch1 with a switch in between. This interface IP is 10.0.0.2/16. There is a serial interface with IP address 209.165.201.2/29 connected to the cloud.
  • 10.0.0.1
  • 10.1.0.1
  • 192.168.1.100
  • 209.165.201.1

 Q17. A network technician issues the following commands when configuring a router:

R1(config)# router ospf 11 
R1(config-router)# network 10.10.10.0 0.0.0.255 area 0

What does the number 11 represent?

  • the administrative distance that is manually assigned to R1
  • the cost of the link to R1
  • the area number where R1 is located
  • the autonomous system number to which R1 belongs
  • the OSPF process ID on R1

Q17. What will an OSPF router prefer to use first as a router ID?

  • the highest active interface that participates in the routing process because of a specifically configured network statement
  • any IP address that is configured using the router-id command
  • a loopback interface that is configured with the highest IP address on the router
  • the highest active interface IP that is configured on the router

Q18. 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 interface brief
  • show ip route ospf
  • show ip protocols
  • show ip ospf interface

Q19. 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?​

The graphic contains four routers, labeled A, B, C, and D, which are connected to each other through a switch. They are all connected to the switch through their GigabitEthernet0/0 interfaces. Router A has router ID 4.4.4.4 and is connected to LAN 172.16.2.0/24. Router B has router ID 2.2.2.2 and is connected to LAN 172.16.4.0/24. Router C has router ID 1.1.1.1 and is connected to LAN 172.16.1.0/24. Router D has router ID 3.3.3.3 and is connected to LAN 172.16.3.0/24.
  • If the priority of router C is changed to 255, then it will become the DR.
  • Router A will become the DR and router D will become the BDR.​
  • If the DR fails, the new DR will be router B.
  • If a new router with a higher priority is added to this network, it will become the DR.

Q20. 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.)

There are 4 routers connected to a centrally located switch. Near R1 there is a tag with the following information: Router-ID: 1.1.1.1 FastEthernet 0/0: 192.168.1.3 FastEthernet 0/0 priority: 1 Serial 0/0/0: 10.0.2.1 Loopback 0: 172.16.1.3 Near R2 there is a tag with the following information: Router-ID: Not configured FastEthernet 0/0: 192.168.1.5 FastEthernet 0/0 priority: 255 Serial 0/0/0: 10.0.3.1 Loopback 0: Not configured Near R3 there is a tag with the following information: Router-ID: Not configured FastEthernet 0/0: 192.168.1.4 FastEthernet 0/0 priority: 1 Serial 0/0/0: 10.0.1.1 Loopback 0: Not configured Near R4 there is a tag with the following information: Router-ID: Not configured FastEthernet 0/0: 192.168.1.2 FastEthernet 0/0 priority: Default Serial 0/0/0: 10.0.1.1 Loopback 0: 172.16.1.1
  • The router ID on R2 is the loopback interface.
  • R3 will be elected BDR.
  • R2 will be elected DR.
  • The R4 router ID is 172.16.1.1.
  • R1 will be elected BDR.
  • The R4 FastEthernet 0/0 priority is 128.

CCNA 3 v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers

Q21. 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?

The exhibit shows a cloud labeled "The World" in the upper left corner. Within that cloud is a router labeled ISP. The ISP router connects through a serial connection to a router labeled R0-A. R0-A and two other routers and three switches are contained within a circle labeled OSPF Area 0. R0-A connects to a switch. That same switch has a connection to R0-B (that has a separate connection to another switch) and R0-C (that has a separate connection to another switch).
  • ISP and R0-A
  • ISP
  • R0-A
  • R0-B and R0-C
  • ISP, R0-A, R0-B, and R0-C
  • R0-A, R0-B, and R0-C

CCNAv7 System Test Course (Version 1.1) – System Test Exam Answers

Q22. 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?

  • outer(config-router)# network 172.16.1.0 0.0.255.255 area 0
  • router(config-router)# network 172.16.0.0 0.0.15.255 area 0
  • router(config-router)# network 172.16.1.0 255.255.255.0 area 0
  • router(config-router)# network 172.16.1.0 0.0.0.0 area 0

Q23. 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?

  • link-state update
  • link-state request
  • database description
  • link-state acknowledgment

Q24. Match the OSPF state with the order in which it occurs. (Not all options are used.)

CCNA 3 v7 Modules 1 - 2: OSPF Concepts and Configuration Exam Answers 11

Q25. Which three OSPF states are involved when two routers are forming an adjacency? (Choose three.)

  • ExStart
  • Down
  • Loading
  • Init
  • Two-way
  • Exchange

Q26. What is a benefit of multiarea OSPF routing?

  • Routers in all areas share the same link-state database and have a complete picture of the entire network.
  • Topology changes in one area do not cause SPF recalculations in other areas.
  • A backbone area is not required.
  • Automatic route summarization occurs by default between areas.

Q27. What is the default router priority value for all Cisco OSPF routers?

  • 0
  • 1
  • 10
  • 255

Q28. 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 5 minutes
  • every 10 minutes
  • every 30 minutes
  • every 60 minutes

Q29. 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 graphic shows a router R1 connected to a switch. The switch is connected to another router R2. Below R1 there is a label with the text: Hello Timer: 5 Dead Interval: 20. Below R2 there is a label with the text: Hello Timer: 25 Dead Interval: 100.
  • The R1 dead timer expires between hello packets from R2.
  • The neighbor adjacency has formed.
  • R1 automatically adjusts its own timers to match the R2 timers.
  • The hello timer on R2 expires every ten seconds.

Q30. 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
  • router priority
  • dead interval
  • router ID
  • list of neighbors

CCNA 3 v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers

CCNAv7 System Test Course (Version 1.1) – System Test Exam Answers

Q31. What is used to facilitate hierarchical routing in OSPF?

  • the election of designated routers
  • autosummarization
  • frequent SPF calculations
  • the use of multiple areas

Q32. Match each OSPF packet type to how it is used by a router. (Not all options are used.)

CCNA 3 v7 Modules 1 - 2: OSPF Concepts and Configuration Exam Answers 12

Q33. 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?

  • 0.0.0.7
  • 0.0.63.255
  • 0.0.3.255
  • 0.0.0.3

Q34. By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater?

  • 1
  • 100
  • 10000
  • 100000000

Q35. 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
  • show ip ospf neighbor
  • show ipv6 ospf interface serial 0/0/0
  • show ip ospf interface fastethernet 0/1

Q36. Which step in the link-state routing process is described by a router building a link-state database based on received LSAs?

  • selecting the router ID
  • declaring a neighbor to be inaccessible
  • executing the SPF algorithm
  • building the topology table

Q37. Which OSPF data structure is identical on all OSPF routers that share the same area?

  • forwarding database
  • link-state database
  • adjacency database
  • routing table

Q38. In an OSPF network when are DR and BDR elections required?

  • when all the routers in an OSPF area cannot form adjacencies
  • when the two adjacent neighbors are in two different networks
  • when the two adjacent neighbors are interconnected over a point-to-point link
  • when the routers are interconnected over a common Ethernet network

Q39. What indicates to a link-state router that a neighbor is unreachable?

  • if the router no longer receives routing updates
  • if the router no longer receives hello packets
  • if the router receives an LSP with previously learned information
  • if the router receives an update with a hop count of 16

Q40. Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router?

  • builds the topology table
  • executes the SPF algorithm
  • chooses the best path
  • exchanges link-state advertisements

Q41. What type of address is 64.101.198.197?

  • public
  • private

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CCNA 3 v7 Modules 1 – 2: OSPF Concepts and Configuration Exam Answers
NOTE: If you have a new question on this test, please comment Question and Multiple-Choice list in form below this article. We will update answers for you in the shortest time. Thank you! We truly value your contribution to the website

CCNAv7 System Test Course (Version 1.1) – System Test Exam Answers

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