What are two features of OSPF interarea route summarization? (Choose two)

Use the questions here to review what you learned in this module. The correct answers and solutions are found in the Module Self-Check Answer Key.

Q1) Which table is NOT maintained by a link-state routing protocol? (Source: Introducing the OSPF Protocol)

A) routing

B) topology

C) update

D) neighbor

Q2) The memory needed to maintain tables is one disadvantage of link-state protocols. (Source: Introducing the OSPF Protocol)

A) true

B) false

Q3) Match each table to its function. (Source: Introducing the OSPF Protocol)

A) routing

B) topology

C) neighbor

_ 2. stores adjacencies

Q4) Which term refers to the router that connects area 0 to a nonbackbone area? (Source: Introducing the OSPF Protocol)

A) area boundary router

B) area border router

C) autonomous system boundary router

D) backbone router

Q5) What is the recommended guideline for the maximum number of routers per OSPF area? (Source: Introducing the OSPF Protocol)

A) 50

B) 10

C) 200

D) 500

Q6) Which OSPF packet helps form the neighbor adjacency? (Source: Introducing the OSPF Protocol)

A) exchange packet

B) hello packet

C) neighbor discovery packet

D) adjacency packet

Q7) Which criterion does SPF use to determine the best path? (Source: Introducing the OSPF Protocol)

A) lowest delay

B) highest bandwidth

C) lowest total cost of the route

D) total bandwidth of the route

Q8) Which table is populated as a result of the SPF calculations? (Source: Introducing the OSPF Protocol)

A) topology

B) routing

C) adjacency

D) neighbor

Q9) Cisco recommends no more than_area or areas per ABR in addition to area 0.

(Source: Introducing the OSPF Protocol)

A) one

B) two

C) four

D) eight

Q10) An area border router maintains_. (Source: Introducing the OSPF Protocol)

A) a separate database for each area with which it is connected

B) a single database for all areas

C) two databases: one for the backbone and one for all others

D) a separate routing table for each area

Q11) In a multiarea network, any area can be the backbone area, although this is most often area 0. (Source: Introducing the OSPF Protocol)

A) true

B) false

Q12) When an LSA is received by an OSPF router, it is installed in the_. (Source:

Introducing the OSPF Protocol)

A) neighbor table

B) topology table

C) routing table

Q13) An OSPF router receives an LSA, the router checks its sequence number, and this number matches the sequence number of the LSA that the receiving router already has. What does the receiving router do with the LSA? (Source: Introducing the OSPF Protocol)

A) ignores the LSA

B) adds it to the database

C) sends newer LSU update to source router

D) floods the LSA to the other routers

Q14) An OSPF router receives an LSA. The router checks its sequence number and finds that this number is higher than the sequence number it already has. Which two tasks does the router perform with the LSA? (Choose two.) (Source: Introducing the OSPF Protocol)

A) ignores the LSA

B) adds it to the database

C) sends newer LSU update to source router

D) floods the LSA to the other routers

Q15) An OSPF router receives an LSA. The router checks its sequence number and finds that this number is lower than the sequence number it already has. What does the router do with the LSA? (Source: Introducing the OSPF Protocol)

A) ignores the LSA

B) adds it to the database

C) sends newer LSU update to source router

D) floods the LSA to the other routers

Q16) Each LSA has its own age timer. By default, how long does an LSA wait before requiring an update? (Source: Introducing the OSPF Protocol)

A) 30 seconds

B) 1 minute

C) 30 minutes

D) 1 hour

Q17) Distance vector protocols use the concept of split horizon, but link-state routing protocols, such as OSPF, do not. (Source: Introducing the OSPF Protocol)

A) true

B) false

Q18) The outcome of Dijkstra's calculation is used to populate the_. (Source:

Introducing the OSPF Protocol)

A) topology table

B) routing table

C) neighbor table

D) adjacency table

Q19) What is the IP protocol number for OSPF packets? (Source: OSPF Packet Types)

A) 89

B) 86

C) 20

D) 76

Q20) Which packet is NOT an OSPF packet type? (Source: OSPF Packet Types)

A)	LSU
B)	LSR
C)	DBD
D)	LSAck
E)	hello
F)	query

Q21) Which multicast address does the OSPF Hello protocol use? (Source: OSPF Packet Types)

Q22) The Hello protocol sends periodic updates to ensure that a neighbor relationship is maintained between adjacent routers. (Source: OSPF Packet Types)

A) true

B) false

Q23) Place the exchange protocol states in the correct order. (Source: OSPF Packet Types)

B) _loading

E) _exchange f) _init

G) _exstart

Q24) DBD packets are involved during which two states? (Choose two.) (Source: OSPF Packet Types)

A) exstart

B) loading

C) exchange

D) two-way

Q25) At which interval does OSPF refresh LSAs? (Source: OSPF Packet Types)

A) 10 seconds

B) 30 seconds

C) 30 minutes

D) 1 hour

Q26) Which field is NOT a field within an OSPF packet header? (Source: OSPF Packet Types)

A) packet length

B) router ID

C) authentication type

D) maxage time

Q27) Which two commands are required for basic OSPF configuration? (Choose two.) (Source: Configuring OSPF Routing)

A) network ip-address mask area area-id

B) network ip-address wildcard-mask area area-id

C) router ospf process-id

D) ip router ospf

Q28) Which OSPF show command describes a list of OSPF adjacencies? (Source: Configuring OSPF Routing)

A) show ip ospf interface

B) show ip ospf

C) show ip route

D) show ip ospf neighbor

Q29) Which technique is NOT used for router ID selection? (Source: Configuring OSPF Routing)

A) highest IP address on an interface

B) IP address on a loopback interface

C) lowest IP address when multiple loopback interfaces are used

D) the router-id command

Q30) When you are using the router-id command, the router ID immediately changes to the IP address that has been entered. (Source: Configuring OSPF Routing)

A) true

B) false

Q31) Which network statement is used to configure OSPF on an interface with IP address 172.16.1.1 in area 0? (Source: Configuring OSPF Routing)

C) network 172.16.1.1 255.255.255.255 area 0

D) network 172.16.0.0 0.0.255.255 area 0

Q32) Only one OSPF process can run on a Cisco router at one time. (Source: Configuring OSPF Routing)

A) true

B) false

Q33) Which mode is the ip ospf process-id area area-id command entered in? (Source: Configuring OSPF Routing)

C) (config-router)#

Q34) The OSPF router-id command should be used in global configuration mode. (Source: Configuring OSPF Routing)

A) true

B) false

Q35) A router has a FastEthemet interface with IP address 172.16.45.1, a loopback 0

interface with IP address 10.3.3.3, a loopback 1 interface with 10.2.2.2, and a router-id command with IP address 10.1.1.1. Which router ID will be selected? (Source: Configuring OSPF Routing)

Q36) The show ip ospf neighbor command shows a FULL state on one of the two neighbors in its table. Which neighbor or neighbors successfully exchange LSDB information? (Source: Configuring OSPF Routing)

A) neighbor in FULL state

B) neighbor not in FULL state

C) both have exchanged databases

D) neither has exchanged databases

Q37) Which two show commands can be used to verify the OSPF router ID of a router? (Choose two.) (Source: Configuring OSPF Routing)

A) show ip ospf interface

B) show ip ospf neighbor

C) show ip ospf

D) show ip route

Q38) When you configure a loopback interface, you choose an IP address that is not going to be advertised by OSPF. This loopback address_. (Source: Configuring OSPF

Routing)

A) cannot be a router ID because it cannot be pinged

B) can be the router ID, even though it cannot be pinged

C) can be the router ID and can be pinged if a private address is selected

D) cannot be the router ID; you should always advertise loopback addresses

Q39) Which statement describes the process ID on the router ospf command? (Source: Configuring OSPF Routing)

A) All OSPF routers in a network must have the same OSPF process ID.

B) The OSPF process ID is an internal number and does not need to match that on other routers.

C) The OSPF process ID is similar to an AS number.

D) There can be only one OSPF process ID in a router configuration.

Q40) OSPF does not require a Hello protocol on point-to-point links because the adjacent router is directly connected. (Source: OSPF Network Types)

A) true

B) false

Q41) Three routers are connected to an Ethernet LAN. One is a small router that should not take on the role of DR or BDR. How do you ensure that it never will? (Source: OSPF Network Types)

A) Set the interface priority to 100.

B) Set the interface priority to 0.

C) Leave the interface priority set to 1 and set the priority of the other two routers to 10.

D) Use the no designated-router command on the Ethernet interface.

Q42) When the DR fails, the BDR builds new adjacencies, exchanges databases, and takes over as DR automatically. (Source: OSPF Network Types)

A) true

B) false

Q43) What is the default hello interval for NBMA interfaces? (Source: OSPF Network Types)

A) 10 seconds

B) 30 seconds

C) 120 seconds

D) 60 seconds

Q44) An OSPF router automatically builds adjacencies with neighboring routers on an NBMA link. (Source: OSPF Network Types)

A) true

B) false

Q45) Which mode of OSPF operation is RFC-compliant? (Source: OSPF Network Types)

A) point-to-multipoint nonbroadcast

B) point-to-multipoint

C) broadcast

D) point-to-point

Q46) Match the OSPF over Frame Relay mode of operation with its description. (Source: OSPF Network Types)

A) broadcast

B) point-to-multipoint

C) nonbroadcast

_____1. does not discover neighbors automatically

_____2. discovers neighbors automatically and requires DR and BDR election

_____3. used in partial-mesh topologies, does not require DR and BDR election, automatically discovers neighbors

Q47) Which two OSPF over Frame Relay modes elect a DR? (Choose two.) (Source: OSPF Network Types)

A) broadcast

B) nonbroadcast

C) point-to-multipoint

D) point-to-point

Q48) A point-to-point subinterface solves which two problems with OSPF over Frame Relay? (Choose two.) (Source: OSPF Network Types)

A) works with multiple vendors

B) manual configuration of neighbors not required

C) DR and BDR not required

D) saves on subnets

Q49) When troubleshooting a DR election problem, which is an excellent command to use? (Source: OSPF Network Types)

A) show ip ospf

B) show ip route

C) debug ip ospf neighbor

D) debug ip ospf adj

Q50) Which destination IP address does OSPF use when advertising to all SPF routers? (Source: OSPF Network Types)

C) 255.255.255.255

D) IP address of output interface

Q51) What are the three types of networks defined by OSPF? (Choose three.) (Source: OSPF Network Types)

A) point-to-point

B) broadcast

C) point-to-multipoint

D) point-to-multipoint nonbroadcast

E) nonbroadcast multiaccess

Q52) With a hello interval of 10 seconds, what does the dead interval default to? (Source: OSPF Network Types)

A) 10 seconds

B) 20 seconds

C) 40 seconds

D) 60 seconds

Q53) The BDR, like the DR, maintains a full set of adjacencies on a broadcast link. (Source: OSPF Network Types)

A) true

B) false

Q54) Which two protocols use the OSPF nonbroadcast mode by default? (Choose two.) (Source: OSPF Network Types)

A)	PPP
B)	HDLC
C)	X.25
D)	ATM
E)	SLIP

Q55) Which two modes require a DR? (Choose two.) (Source: OSPF Network Types)

A) point-to-point

B) broadcast

C) point-to-multipoint

D) nonbroadcast

Q56) Which two statements regarding the OSPF nonbroadcast mode are correct? (Choose two.) (Source: OSPF Network Types)

A) requires manual neighbor commands

B) does not use a DR and BDR

C) uses a DR and BDR

D) requires multiple subnets

Q57) When you are using an OSPF neighbor command, you must configure it under an interface. (Source: OSPF Network Types)

A) true

B) false

Q58) Which OSPF mode requires neighbor commands? (Source: OSPF Network Types)

A) broadcast

B) point-to-point

C) point-to-multipoint

D) point-to-multipoint nonbroadcast

Q59) You have a partially meshed hub-and-spoke Frame Relay network. You consider using the ip ospf network broadcast command on the Frame Relay interface because you do not want to configure neighbor router statements. Is this a good idea? (Source: OSPF Network Types)

A) yes

B) no

Q60) Which three benefits are derived from a multiarea design in OSPF? (Choose three.) (Source: Link-State Advertisements)

A) reduced LSA flooding

B) reduced SPF calculations

C) reduced size of the neighbor table

D) reduced size of the routing table

Q61) Which router is not an OSPF router type? (Source: Link-State Advertisements)

A)	backbone
B)	ABR
C)	ASBR
D)	core

Q62)

List the four link types that a type 1 LSA defines. (Source: Link-State Advertisements)

Q63) Match each LSA name with the number that corresponds to its LSA type. (Source: Link-State Advertisements)

external

network

summary

multicast

router

opaque

9-11

Q64) Which of the following is NOT described in the output of the show ip ospf database command? (Source: Link-State Advertisements)

A) advertising router

B) maximum age counter

C) link count

D) LSA type

E) link type

Q65) If the OSPF routing table shows an O E1 route, what does this mean? (Source: LinkState Advertisements)

A) It is an interarea route that uses the external cost plus the interarea cost.

B) It is an interarea route that uses the external cost only.

C) It is an external route that uses the external cost only.

D) It is an external route that uses the external cost plus the internal cost.

Q66) Which two LSAs describe intra-area routing information? (Choose two.) (Source: Link-State Advertisements)

A) summary

B) external 1

C) external 2

D) router

E) network

Q67) Where will a type 3 LSA be sent? (Source: Link-State Advertisements)

A) only within the area it originates from

B) within the area it originates from plus the backbone area

C) within the area it originates from plus all other areas

D) within the backbone area plus all other areas

Q68) An O E1 route sums up the external metric and the interarea metric, while the O E2

route uses the external metric only. The O E1 route is the default for OSPF; the router must be configured to support O E2. (Source: Link-State Advertisements)

A) true

B) false

Q69) A network uses Gigabit Ethernet and you want OSPF to correctly calculate the metric using bandwidth. Which command should you use to ensure that this happens? (Source: Link-State Advertisements)

A) ip ospf cost on the interface

B) auto-cost reference-bandwidth under the OSPF routing process

C) bandwidth under the interface

D) bandwidth under the OSPF routing process

Q70) Looking at the routing table, you notice "[110/55]." What does this mean? (Source: Link-State Advertisements)

A) The O E1 cost is 110, and the O E2 cost is 55.

B) The administrative distance is 110, and the metric is 55.

C) The administrative distance is 55, and the metric is 110.

D) The total cost of the route is 165.

Q71) What does it mean if a route in the routing table has an indicator of O? (Source: LinkState Advertisements)

A) It is intra-area.

B) It is interarea.

C) It is external.

Q72) What is the difference between an LSA 3 and an LSA 4? (Source: Link-State Advertisements)

A)	LSA	3	is
B)	LSA	3	is
C)	LSA	3	is
D)	LSA	3	is

Q73) By default, OSPF assigns a cost of 1 to a bandwidth of_. (Source: Link-State

Advertisements)

A) T1

B) 1 Gbps (gigabits per second)

C) 100 Mbps (megabits per second)

D) 10 Gbps

Q74) The OSPF LSDB shows an LSA with an age of 1799. What does this mean? (Source: Link-State Advertisements)

A) The LSA is going to age out in 1 second.

B) It has been 1799 minutes since the last update.

C) The LSA will be refreshed in 1 second.

D) The LSA was just refreshed, and another refresh is coming in 29 minutes and 59 seconds.

Q75) Summary LSAs are not automatically summarized. (Source: Link-State Advertisements)

A) true

B) false

Q76) What are the two reasons why route summarization is important? (Choose two.) (Source: OSPF Route Summarization)

A) reduces LSA type 1 flooding

B) reduces LSA type 3 flooding

C) reduces the size of the routing table

D) reduces the size of the neighbor table

Q77) Which two features play a key role in route summarization? (Choose two.) (Source: OSPF Route Summarization)

A) network numbers in areas should be assigned contiguously

B) network numbers in areas should be assigned discontiguously

C) FLSM

D) VLSM

Q78) Which command would you use to summarize routes into area 0 from the ABR? (Source: OSPF Route Summarization)

A) summary-address

B) area x range

C) network

D) area x summary

Q79) Which command would you use to summarize routes into OSPF from the ASBR? (Source: OSPF Route Summarization)

A) summary-address

B) area x range

C) network

D) area x summary

Q80) A default route is identified in the OSPF database as an_. (Source: OSPF Route

Summarization)

A) LSA type 1

B) LSA type 2

C) LSA type 3

D) LSA type 4

E) LSA type 5

Q81) The primary purpose of a default route is to reduce the routing table and LSDB size. A default route avoids detailed updating of routes by inserting a single 0.0.0.0 into the routing table, making this 0.0.0.0 route act as a gateway of last resort. (Source: OSPF Route Summarization)

A) true

B) false

Q82) When should you use the always keyword with the default-information originate command? (Source: OSPF Route Summarization)

A) on by default; configuration not required

B) when you want to send summarized routes

C) when your default route is always in the routing table

D) when you want the default route advertised, even if it is not in the routing table

Q83) Default routes must always be O E2 routes; there is no other choice. (Source: OSPF Route Summarization)

A) true

B) false

Q84) A summary LSA (type 3 LSA) is designed to automatically summarize a network into blocks. (Source: OSPF Route Summarization)

A) true

B) false

Q85) Route summarization reduces the flooding of which two of the following LSA types? (Choose two.) (Source: OSPF Route Summarization)

A) router

B) network

C) summary

D) external

E) NSSA

Q86) You are at the ABR of area 1 and want to classfully summarize network 172.16.32.0 through 172.16.63.0 into area 0. Write the configuration command that you would use. (Source: OSPF Route Summarization)

Q87) You are at the ASBR between an OSPF area 0 and an EIGRP network. EIGRP routes are being redistributed into OSPF. Write the correct summarization command to summarize the EIGRP block 172.16.32.0 through 172.16.63.0. (Source: OSPF Route Summarization)

Q88) It is important to always summarize the routes from area 0 into other areas. Suboptimal path selection can occur if you do not. (Source: OSPF Route Summarization)

A) true

B) false

Q89) The area range command has an optional not-advertise parameter, which is used to prevent advertising_. (Source: OSPF Route Summarization)

A) all summary LSAs into area 0

B) summary LSAs that match the area range command

C) all external LSAs

D) external LSAs that match the area range command

Q90) Generally, a default route is described in the routing table as an_. (Source: OSPF

Route Summarization)

A) O route

B) O IA route

Q91) Which command is best to use if you want to establish a default route from a router that has no default route in its routing table? (Source: OSPF Route Summarization)

B) default-information originate

C) default-information originate always

D) static route

Q92) The area x range and network commands are similar because both use inverse masks for configuration purposes. (Source: OSPF Route Summarization)

A) true

B) false

Q93) A default route is a form of route summarization. (Source: OSPF Route Summarization)

A) true

B) false

Q94) Which is NOT permitted in a stub area? (Source: Configuring OSPF Special Area Types)

A) an ABR

B) an ASBR

C) summary routes

D) summary LSAs

Q95) Which type of router advertises the default into a stub area? (Source: Configuring OSPF Special Area Types)

A) ASBR

B) backbone router

C) ABR

D) internal router

Q96) What is the correct configuration for stub area 10? (Source: Configuring OSPF Special Area Types)

A) area 10 stub-area

B) router ospf 10 stub

C) area 10 stub

D) area 10 stub no-summary

Q97) What is the meaning of the no-summary parameter of the area x stub command? (Source: Configuring OSPF Special Area Types)

A) There is no route summarization in the stub area.

B) No summary LSAs are sent into the stub area.

C) No type 5 LSAs are sent into in the stub area.

D) There are no external LSAs in the stub area.

Q98) The default route has a cost of 1 from the stub area ABR if no area default-cost command is used. (Source: Configuring OSPF Special Area Types)

A) true

B) false

Q99) Which characteristic relates to NSSA? (Source: Configuring OSPF Special Area Types)

A) allows stub area benefits without meeting stub area requirements

B) is a Cisco proprietary technique

C) allows ASBRs but not virtual links

D) floods LSA type 7 into the backbone area

Q100) A disadvantage of NSSA is that it does not have a totally stubby feature like a normal stub area. (Source: Configuring OSPF Special Area Types)

A) true

B) false

Q101) Which characteristic is not a prerequisite for stub areas? (Source: Configuring OSPF Special Area Types)

A) virtual links not allowed b) ASBRs not allowed

C) ABRs not allowed

D) one way in and out of the stub area

Q102) Stub area design will not improve_. (Source: Configuring OSPF Special Area

Types)

A) CPU utilization on routers in the stub

B) memory requirements on routers in the stub

C) ability to reach outside networks

D) LSDB size on routers in the stub

Q103) An LSA type 7 appears in the routing table as an_. (Source: Configuring OSPF

Special Area Types)

C) O N2 route

Q104) What is the difference between stub area and totally stubby area configuration? (Source: Configuring OSPF Special Area Types)

A) no-summary option at the ABR

B) area area-id totally-stubby command at the internal routers

C) area area-id nssa command at the internal routers

D) default-cost command at the ABR

Q105) A stub area blocks summary LSAs (type 3 and 4 LSAs). (Source: Configuring OSPF Special Area Types)

A) true

B) false

Q106) Where should you configure the area area-id stub command when you are configuring a stub area? (Source: Configuring OSPF Special Area Types)

A) on all routers in the area

B) on the ABR

C) on the ASBR

D) on routers that require stub capability within the area

Q107) Which two features are specific to Cisco? (Choose two.) (Source: Configuring OSPF Special Area Types)

A) stub areas

B) totally stubby areas

C) NSSA

D) totally stubby NSSA

Q108) In NSSA, the NSSA ABR translates type 7 LSAs into type 5 LSAs. (Source: Configuring OSPF Special Area Types)

A) true

B) false

Q109) The ABR injects a default route into which three types of areas? (Choose three.) (Source: Configuring OSPF Special Area Types) A) stub b) totally stubby NSSA

C) totally stubby

D) area 0

Q110) Which two types of authentication are used in OSPF? (Choose two.) (Source: Configuring OSPF Authentication)

A) MD5

B) encrypted password

C) simple password

D) MD6

Q111) When OSPF authentication is configured between two routers, each router has its own unique password. (Source: Configuring OSPF Authentication)

true false

Q112) Which three of the following are used to generate the message digest when OSPF MD5 authentication is configured? (Choose three.) (Source: Configuring OSPF Authentication)

A) packet

B) sequence number

C) key ID

D) key

E) router ID

Q113) Which command is used to specify that OSPF simple password authentication is to be used? (Source: Configuring OSPF Authentication)

A) ip ospf authentication simple

B) ip ospf authentication

C) ip ospf authentication-key

D) ip ospf message-digest-key

E) ip ospf authentication message-digest

Q114) Which command is used to specify that OSPF MD5 authentication is to be used? (Source: Configuring OSPF Authentication)

A) ip ospf authentication simple

B) ip ospf authentication

C) ip ospf authentication-key

D) ip ospf message-digest-key

E) ip ospf authentication message-digest

Q115) When a new MD5 key is configured on a router for OSPF authentication, it will use both the old and new key until the new key is configured on neighboring routers. (Source: Configuring OSPF Authentication)

true false

Q116) Which command is used to troubleshoot OSPF authentication? (Source: Configuring OSPF Authentication)

A) debug ip ospf adj

B) debug ip ospf adjacency events

C) debug ip ospf database

D) debug ip ospf packets

Continue reading here: Integrated ISIS vs OSPF Area Design Cont

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