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OSPF Concepts and Configuration Exam Questions and Answers, Exams of Social Sciences

United States International UniversitySocial Sciences

A set of questions and answers related to ospf (open shortest path first) concepts and configuration. It covers topics such as ospf adjacency, hello packets, dead intervals, dr/bdr election, and ospf packet types. The questions are designed to test understanding of ospf routing protocol and its configuration parameters. This material is useful for network engineers and students studying for routing and switching certifications, offering practical insights into ospf troubleshooting and design. Multiple-choice questions and matching exercises to reinforce learning and assess comprehension of key ospf concepts.

Typology: Exams

2025/2026

Available from 11/25/2025

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OSPF CONCEPTS AND CONFIGURATION EXAM
ROUTING/SWITCHING CHECKPOINT EXAM
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 - Answer -- exchanges link-state advertisements
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
- list of neighbors
- router ID
- hello interval - Answer -- dead interval
- hello interval
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 15 seconds.
- The dead interval will now be 30 seconds.
- The dead interval will now be 60 seconds.
- The dead interval will not change from the default value. - Answer -- The dead interval
will now be 60 seconds.
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. - Answer -- The R1 dead timer expires between
hello packets from R2.
What is a benefit of multiarea OSPF routing?
- Topology changes in one area do not cause SPF recalculations in other areas.
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OSPF CONCEPTS AND CONFIGURATION EXAM

ROUTING/SWITCHING CHECKPOINT EXAM

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 - Answer -- exchanges link-state advertisements 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
  • list of neighbors
  • router ID
  • hello interval - Answer -- dead interval
  • hello interval 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 15 seconds.
  • The dead interval will now be 30 seconds.
  • The dead interval will now be 60 seconds.
  • The dead interval will not change from the default value. - Answer -- The dead interval will now be 60 seconds. 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. - Answer -- The R1 dead timer expires between hello packets from R2. What is a benefit of multiarea OSPF routing?
  • Topology changes in one area do not cause SPF recalculations in other areas.
  • Routers in all areas share the same link-state database and have a complete picture of the entire network.
  • Automatic route summarization occurs by default between areas.
  • A backbone area is not required. - Answer -- Topology changes in one area do not cause SPF recalculations in other areas. Which OSPF data structure is identical on all OSPF routers that share the same area?
  • forwarding database
  • link-state database
  • adjacency database
  • routing table - Answer -- link-state database What is used to facilitate hierarchical routing in OSPF?
  • the use of multiple areas
  • autosummarization
  • the election of designated routers
  • frequent SPF calculations - Answer -- the use of multiple areas 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
  • link-state update
  • link-state request
  • link-state acknowledgment - Answer -- database description Match each OSPF packet type to how it is used by a router. Categories: a) hello packet b) link-state update packet c) link-state request packet d) database description packet Options:
  • advertise new information
  • establish and maintain adjacencies
  • query another router for additional information
  • compare local topology to that sent by another router - Answer -- advertise new information b) link-state update packet
  • establish and maintain adjacencies a) hello packet

e) seventh state

  • Down state c) first state
  • Init state d) second state 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
  • every 10 minutes
  • every 5 minutes
  • every 60 minutes - Answer -- every 30 minutes What indicates to a link-state router that a neighbor is unreachable?
  • if the router no longer receives routing updates
  • if the router receives an update with a hop count of 16
  • if the router no longer receives hello packets
  • if the router receives an LSP with previously learned information - Answer -- if the router no longer receives hello packets Which three OSPF states are involved when two routers are forming an adjacency? (Choose three.)
  • ExStart
  • Two-way
  • Exchange
  • Loading
  • Down
  • Init - Answer -- Two-way
  • Down
  • Init 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 R3 will become the BDR.
  • 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. - Answer -- Router R4 will become the DR and router R1 will become the BDR.

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 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 a new router with a higher priority is added to this network, it will become the DR.
  • If the DR fails, the new DR will be router B. - Answer -- If the DR fails, the new DR will be router B. 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 R
  • the cost of the link to R
  • the OSPF process ID on R
  • the area number where R1 is located
  • the autonomous system number to which R1 belongs - Answer -- the OSPF process ID on R Refer to the exhibit. Which command did an administrator issue to produce this output?
  • R1# show ip ospf
  • R1# show ip ospf interface serial0/0/
  • R1# show ip ospf neighbor
  • R1# show ip route ospf - Answer -- R1# show ip ospf interface serial0/0/ 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 neighbor
  • show ipv6 ospf interface serial 0/0/
  • show ip ospf interface serial 0/0/
  • show ip ospf interface fastethernet 0/1 - Answer -- show ip ospf interface serial 0/0/ By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater?
  • 1
  • 100
  • 100000000
  • 10000 - Answer -- 1
  • R1 will be elected BDR.
  • The router ID on R2 is the loopback interface. - Answer -- The R4 router ID is 172.16.1.1.
  • R2 will be elected DR.
  • R3 will be elected BDR. Refer to the exhibit. If no router ID was manually configured, what would router Branch use as its OSPF router ID?
  • 209.165.201.
  • 192.168.1.
  • 10.1.0.
  • 10.0.0.1 - Answer -- 192.168.1. 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
  • show ip interface brief
  • show ip ospf interface
  • show ip route ospf - Answer -- show ip protocols 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. network to neighbors?
  • router(config-router)# network 172.16.1.0 0.0.0.0 area 0
  • router(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 - Answer -- router(config-router)# network 172.16.1.0 255.255.255.0 area 0 What command would be used to determine if a routing protocol-initiated relationship had been made with an adjacent router?
  • ping
  • show ip protocols
  • show ip interface brief
  • show ip ospf neighbor - Answer -- show ip ospf neighbor Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/ from B?
  • 65
  • 74
  • 782
  • 128 - Answer -- 65 After modifying the router ID on an OSPF router, what is the preferred method to make the new router ID effective?
  • HQ# resume
  • HQ# copy running-config startup-config
  • HQ# clear ip route *
  • HQ# clear ip ospf process - Answer -- HQ# clear ip ospf process Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. Which task has to be performed on Router 1 for it to establish an OSPF adjacency with Router 2?
  • 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.
  • Change the subnet mask of interface FastEthernet 0/0 to 255.255.255.0.
  • Issue the clear ip ospf process command. - Answer -- Change the subnet mask of interface FastEthernet 0/0 to 255.255.255.0. 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.
  • 0.0.31.
  • 0.0.0.
  • 0.0.63.255 - Answer -- 0.0.3. 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?
  • 0.0.63.
  • 0.0.15.
  • 0.0.1.
  • 0.0.31.255 - Answer -- 0.0.1. What is the format of the router ID on an OSPF-enabled router?
  • a unique phrase with no more than 16 characters
  • a character string with no space
  • a 32-bit number formatted like an IPv4 address
  • an 8-bit number with a decimal value between 0 and 255

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. - Answer -- Configure a value using the router-id command. Which step in the link-state routing process is described by a router flooding link-state and cost information about each directly connected link?
  • selecting the router ID
  • building the topology table
  • exchanging link-state advertisements
  • injecting the default route - Answer -- exchanging link-state advertisements Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces?
  • electing the designated router
  • establishing neighbor adjacencies
  • injecting the default route
  • exchanging link-state advertisements - Answer -- establishing neighbor adjacencies