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OSPF Flashcards

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1
Q

What does OSPF stand for?
a) Open Shortest Path First
b) Optimal Shortest Path Forwarding
c) Open Secure Path First
d) Optimal Secure Path Forwarding

A

Answer: a) Open Shortest Path First

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2
Q

Which algorithm does OSPF use to calculate the shortest path?
a) Bellman-Ford
b) Dijkstra
c) Spanning Tree
d) Diffie-Hellman

A

Answer: b) Dijkstra

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3
Q

What is the administrative distance of OSPF?
a) 90
b) 100
c) 110
d) 120

A

Answer: c) 110

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4
Q

Which transport protocol does OSPF use?
a) TCP
b) UDP
c) IP (Protocol 89)
d) ICMP

A

Answer: c) IP (Protocol 89)

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5
Q

What is the default OSPF hello interval on a broadcast multi-access network?
a) 5 seconds
b) 10 seconds
c) 30 seconds
d) 60 seconds

A

Answer: b) 10 seconds

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6
Q

Which OSPF packet type is used to establish neighbor adjacency?
a) Hello
b) DBD (Database Description)
c) LSR (Link-State Request)
d) LSU (Link-State Update)

A

Answer: a) Hello

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7
Q

What is the default dead interval in OSPF?
a) 10 seconds
b) 20 seconds
c) 40 seconds
d) 60 seconds

A

Answer: c) 40 seconds

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8
Q

Which multicast address does OSPF use for AllSPFRouters?
a) 224.0.0.5
b) 224.0.0.6
c) 224.0.0.9
d) 224.0.0.10

A

Answer: a) 224.0.0.5

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9
Q

Which multicast address does OSPF use for AllDRRouters?
a) 224.0.0.5
b) 224.0.0.6
c) 224.0.0.9
d) 224.0.0.10

A

Answer: b) 224.0.0.6

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10
Q

What is the OSPF router ID selection priority order?
a) Highest loopback > Highest active physical > Manually configured
b) Manually configured > Highest loopback > Highest active physical
c) Highest active physical > Highest loopback > Manually configured
d) Manually configured > Highest active physical > Highest loopback

A

Answer: b) Manually configured > Highest loopback > Highest active physical

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11
Q

Which OSPF network type requires a DR/BDR election?
a) Point-to-Point
b) Broadcast
c) Non-Broadcast Multi-Access (NBMA)
d) Both b and c

A

Answer: d) Both b and c

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12
Q

Which OSPF network type does not require a DR/BDR?
a) Broadcast
b) Point-to-Point
c) Non-Broadcast Multi-Access (NBMA)
d) Point-to-Multipoint

A

Answer: b) Point-to-Point

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13
Q

What is the OSPF default cost for a 100 Mbps Ethernet interface?
a) 1
b) 10
c) 100
d) 1000

A

Answer: a) 1

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14
Q

How is OSPF cost calculated?
a) 10^8 / Bandwidth (bps)
b) 10^6 / Bandwidth (bps)
c) Bandwidth (bps) / 10^8
d) Bandwidth (bps) / 10^6

A

Answer: a) 10^8 / Bandwidth (bps)

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15
Q

Which command manually sets the OSPF router ID?
a) router-id <ID> under OSPF process
b) ip ospf router-id <ID>
c) ospf router-id <ID>
d) set router-id <ID></ID></ID></ID></ID>

A

Answer: a) router-id <ID> under OSPF process</ID>

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16
Q

Which OSPF state means two routers have exchanged DBD packets?
a) Init
b) 2-Way
c) ExStart
d) Exchange

A

Answer: d) Exchange

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17
Q

In which OSPF state are LSAs fully exchanged?
a) Loading
b) Full
c) Exchange
d) 2-Way

A

Answer: b) Full

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18
Q

Which command enables OSPF on an interface?
a) ip ospf enable
b) ip ospf process-id area area-id
c) network <network> <wildcard> area <area></area>
d) Both b and c</wildcard></network>

A

Answer: d) Both b and c

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19
Q

What is the purpose of the OSPF DBD packet?
a) To establish neighbor relationships
b) To describe the LSDB contents
c) To request specific LSAs
d) To flood LSAs

A

Answer: b) To describe the LSDB contents

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20
Q

Which OSPF packet type confirms receipt of LSU packets?
a) Hello
b) LSAck
c) DBD
d) LSR

A

Answer: b) LSAck

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21
Q

What is the backbone area in OSPF?
a) Area 0
b) Area 1
c) Area 100
d) Area 255

A

Answer: a) Area 0

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22
Q

Which LSA type describes intra-area routes?
a) Type 1
b) Type 2
c) Type 3
d) Type 4

A

Answer: a) Type 1 (Router LSA)

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23
Q

Which LSA type is generated by the DR?
a) Type 1
b) Type 2
c) Type 3
d) Type 5

A

Answer: b) Type 2 (Network LSA)

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24
Q

Which LSA type describes routes from other areas?
a) Type 1
b) Type 3
c) Type 5
d) Type 7

A

Answer: b) Type 3 (Summary LSA)

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25
Which LSA type describes external (AS) routes? a) Type 3 b) Type 4 c) Type 5 d) Type 7
Answer: c) Type 5 (External LSA)
26
What is the purpose of a Type 4 LSA? a) To describe ASBR locations b) To describe external routes c) To describe network links d) To describe OSPF neighbors
Answer: a) To describe ASBR locations
27
Which LSA type is used in NSSA areas? a) Type 5 b) Type 7 c) Type 3 d) Type 1
Answer: b) Type 7 (NSSA External LSA)
28
What is a stub area in OSPF? a) An area that blocks Type 5 LSAs b) An area that blocks Type 3 LSAs c) An area that allows all LSAs d) An area that only allows Type 1 LSAs
Answer: a) An area that blocks Type 5 LSAs
29
What is a Totally Stubby Area? a) Blocks Type 3, 4, and 5 LSAs b) Blocks Type 5 and 7 LSAs c) Allows all LSAs d) Blocks Type 1 and 2 LSAs
Answer: a) Blocks Type 3, 4, and 5 LSAs
30
Which command configures an area as stub? a) area stub b) area nssa c) stub area d) area totally-stub
Answer: a) area stub
31
What is an NSSA in OSPF? a) An area that allows external routes via Type 7 LSAs b) An area that blocks all external routes c) An area that only allows Type 1 LSAs d) An area that floods all LSAs
Answer: a) An area that allows external routes via Type 7 LSAs
32
Which command configures an NSSA area? a) area nssa b) nssa area c) area stub nssa d) area totally-nssa
Answer: a) area nssa
33
What is a virtual link in OSPF? a) A tunnel to connect non-backbone areas to Area 0 b) A backup link between two routers c) A logical link for redundancy d) A link used only for multicast traffic Answer: a) A tunnel to connect non-backbone areas to Area 0
Answer: a) A tunnel to connect non-backbone areas to Area 0
34
Which command configures a virtual link? a) area virtual-link b) virtual-link area c) ospf virtual-link d) ip ospf virtual-link
Answer: a) area virtual-link
35
What is the purpose of an ABR in OSPF? a) Connects OSPF to other routing protocols b) Connects multiple OSPF areas c) Generates Type 5 LSAs d) Acts as a DR in a multi-access network
Answer: b) Connects multiple OSPF areas
36
What is the purpose of an ASBR in OSPF? a) Connects OSPF to other routing protocols b) Connects multiple OSPF areas c) Generates Type 3 LSAs d) Acts as a BDR in a multi-access network
Answer: a) Connects OSPF to other routing protocols
37
Which command redistributes routes into OSPF? a) redistribute subnets b) ospf redistribute c) import d) redistribute ospf
Answer: a) redistribute subnets
38
What is the default OSPF metric for redistributed routes? a) 1 b) 10 c) 20 d) 100
Answer: c) 20
39
Which command changes the OSPF reference bandwidth? a) auto-cost reference-bandwidth b) ospf reference-bandwidth c) reference-bandwidth d) ip ospf cost reference
Answer: a) auto-cost reference-bandwidth
40
What happens if OSPF reference bandwidth is set to 10000? a) All interface costs increase b) Only Gigabit interfaces are affected c) Faster interfaces get lower costs d) Slower interfaces get higher costs
Answer: d) Slower interfaces get higher costs
41
Which OSPF network type is default for Ethernet interfaces? a) Point-to-Point b) Broadcast c) Non-Broadcast Multi-Access (NBMA) d) Point-to-Multipoint
Answer: b) Broadcast
42
Which OSPF network type requires manual neighbor configuration? a) Broadcast b) Point-to-Point c) Non-Broadcast Multi-Access (NBMA) d) Point-to-Multipoint Non-Broadcast
Answer: c) Non-Broadcast Multi-Access (NBMA)
43
Which command changes an interface to OSPF Point-to-Point network type? a) ip ospf network point-to-point b) ospf network-type point-to-point c) ip ospf point-to-point d) network point-to-point
Answer: a) ip ospf network point-to-point
44
What is the hello interval for OSPF Point-to-Point networks? a) 5 seconds b) 10 seconds c) 30 seconds d) 60 seconds
Answer: b) 10 seconds
45
Which OSPF network type does not use multicast for hello packets? a) Broadcast b) Point-to-Point c) Non-Broadcast Multi-Access (NBMA) d) Point-to-Multipoint
Answer: c) Non-Broadcast Multi-Access (NBMA)
46
Which command manually defines an OSPF neighbor on NBMA networks? a) neighbor under OSPF process b) ospf neighbor c) ip ospf neighbor d) set neighbor
Answer: a) neighbor under OSPF process
47
What is the default OSPF priority value on Cisco routers? a) 0 b) 1 c) 10 d) 100
Answer: b) 1
48
Which command changes OSPF interface priority? a) ip ospf priority b) ospf priority c) priority d) set ospf priority
Answer: a) ip ospf priority
49
What happens if OSPF priority is set to 0? a) The router cannot become DR/BDR b) The router becomes DR immediately c) The router becomes BDR d) The router ignores DR/BDR election
Answer: a) The router cannot become DR/BDR
50
Which OSPF network type elects a DR but does not require multicast? a) Point-to-Point b) Broadcast c) Non-Broadcast Multi-Access (NBMA) d) Point-to-Multipoint Non-Broadcast
Answer: c) Non-Broadcast Multi-Access (NBMA)
51
What is the purpose of the ip ospf cost command? a) Changes the OSPF reference bandwidth b) Manually sets the interface cost c) Adjusts the OSPF administrative distance d) Modifies the hello interval
Answer: b) Manually sets the interface cost
52
Which command verifies OSPF neighbors? a) show ospf neighbor b) show ip ospf neighbor c) show ospf adjacency d) show ip ospf adjacency
Answer: b) show ip ospf neighbor
53
Which command displays the OSPF routing table? a) show ospf route b) show ip ospf route c) show ip route ospf d) show route ospf
Answer: c) show ip route ospf
54
Which command shows OSPF interface settings? a) show ip ospf interface b) show ospf interface c) show interface ospf d) show ospf settings
Answer: a) show ip ospf interface
55
Which command displays OSPF LSDB entries? a) show ospf database b) show ip ospf database c) show ospf lsdb d) show ip ospf lsdb
Answer: b) show ip ospf database
56
What does the show ip ospf command display? a) OSPF neighbor table b) OSPF process information c) OSPF interface costs d) OSPF LSDB
Answer: b) OSPF process information
57
Which command debugs OSPF hello packets? a) debug ospf hello b) debug ip ospf hello c) debug ospf packets hello d) debug ip ospf adj
Answer: b) debug ip ospf hello
58
Which command clears OSPF processes? a) clear ospf process b) clear ip ospf process c) reset ospf process d) restart ospf
Answer: b) clear ip ospf process
59
What is the purpose of the passive-interface command in OSPF? a) Prevents OSPF from sending hellos on an interface b) Disables OSPF on an interface c) Reduces OSPF LSA flooding d) Blocks OSPF neighbor formation
Answer: a) Prevents OSPF from sending hellos on an interface
60
Which command configures a passive interface in OSPF? a) passive-interface under OSPF process b) ip ospf passive-interface c) ospf passive-interface d) set passive-interface
Answer: a) passive-interface under OSPF process
61
Which OSPF authentication type uses plaintext passwords? a) Null b) Simple c) MD5 d) SHA
Answer: b) Simple
62
Which OSPF authentication type is most secure? a) Null b) Simple c) MD5 d) SHA
Answer: c) MD5
63
Which command enables OSPF MD5 authentication on an interface? a) ip ospf authentication md5 b) ip ospf authentication message-digest c) ospf authentication md5 d) authentication md5
Answer: b) ip ospf authentication message-digest
64
Which command sets the OSPF MD5 key? a) ip ospf message-digest-key md5 b) ospf md5-key c) authentication-key md5 d) set ospf md5
Answer: a) ip ospf message-digest-key md5
65
What is the purpose of OSPF route summarization? a) Reduces LSA flooding b) Increases routing table size c) Disables OSPF on an interface d) Forces DR election
Answer: a) Reduces LSA flooding
66
Which command summarizes OSPF routes at an ABR? a) area range b) summary-address c) ospf summary d) ip ospf summary
Answer: a) area range
67
Which command summarizes OSPF external routes at an ASBR? a) area range b) summary-address c) ospf summary d) ip ospf summary
Answer: b) summary-address
68
What is the purpose of the default-information originate command in OSPF? a) Advertises a default route into OSPF b) Blocks default route propagation c) Summarizes all routes d) Disables OSPF on an interface
Answer: a) Advertises a default route into OSPF
69
Which command injects a default route into OSPF? a) default-information originate b) ospf default-route c) ip route 0.0.0.0 0.0.0.0 ospf d) redistribute static
Answer: a) default-information originate
70
What is the purpose of OSPF stub areas? a) Blocks Type 5 LSAs b) Blocks Type 3 LSAs c) Allows all LSAs d) Disables OSPF authentication
Answer: a) Blocks Type 5 LSAs
71
Which OSPF area type allows external routes but converts them to Type 7 LSAs? a) Stub b) Totally Stubby c) NSSA d) Backbone
Answer: c) NSSA
72
Which command configures a Totally Stubby area? a) area stub no-summary b) area totally-stub c) stub area no-summary d) area stub
Answer: a) area stub no-summary
73
What is the purpose of OSPF virtual links? a) Connects non-backbone areas to Area 0 b) Connects two ABRs c) Provides backup paths d) Blocks Type 5 LSAs
Answer: a) Connects non-backbone areas to Area 0
74
Which command verifies OSPF virtual links? a) show ip ospf virtual-links b) show ospf virtual-links c) show ip ospf d) show ospf
Answer: a) show ip ospf virtual-links
75
What is the purpose of OSPF Graceful Restart? a) Restarts OSPF without disrupting routing b) Forces DR election c) Disables authentication d) Blocks LSAs
Answer: a) Restarts OSPF without disrupting routing
76
Which command enables OSPF Graceful Restart? a) nsf ospf enable b) graceful-restart c) ospf nsf d) nsf under OSPF process
Answer: d) nsf under OSPF process
77
What is the purpose of OSPF SPF throttling? a) Controls how often SPF runs b) Disables SPF c) Forces SPF recalculation d) Blocks LSAs
Answer: a) Controls how often SPF runs
78
Which command adjusts OSPF SPF timers? a) timers spf b) spf timers c) ospf spf d) set spf
Answer: a) timers spf
79
What is the purpose of OSPF LSA throttling? a) Controls LSA generation rate b) Blocks LSAs c) Disables OSPF d) Forces LSA flooding
Answer: a) Controls LSA generation rate
80
Which command adjusts OSPF LSA timers? a) timers lsa b) lsa timers c) ospf lsa d) set lsa
Answer: a) timers lsa
81
What is the most likely cause if an OSPF neighbor relationship does not form? a) Mismatched subnet masks b) Different OSPF areas c) Mismatched hello/dead timers d) All of the above
Answer: d) All of the above
82
Which command helps troubleshoot OSPF adjacency issues? a) debug ip ospf adj b) debug ospf neighbor c) show ip ospf events d) show ospf errors
Answer: a) debug ip ospf adj
83
What prevents OSPF neighbors from forming if MTU settings differ? a) OSPF checks MTU in DBD packets b) OSPF requires jumbo frames c) MTU must be 1500 d) OSPF ignores MTU
Answer: a) OSPF checks MTU in DBD packets
84
What happens if OSPF authentication is misconfigured? a) Neighbors form but routes fail b) Neighbors do not form c) OSPF process crashes d) No effect
Answer: b) Neighbors do not form
85
Which command verifies OSPF authentication settings? a) show ip ospf interface b) show ospf authentication c) debug ip ospf auth d) show ip ospf
Answer: a) show ip ospf interface
86
What is the effect of a high OSPF SPF delay timer? a) Faster convergence b) Slower convergence c) No effect d) Increases LSA flooding
Answer: b) Slower convergence
87
What does a high OSPF "LS Age" value indicate? a) The LSA is new b) The LSA is old and due for refresh c) The router is overloaded d) The LSA is corrupted
Answer: b) The LSA is old and due for refresh
88
Which command shows OSPF SPF execution statistics? a) show ip ospf statistics b) show ip ospf spf-log c) show ospf events d) debug ip ospf spf
Answer: a) show ip ospf statistics
89
What is the purpose of the max-lsa command in OSPF? a) Limits the number of LSAs a router can process b) Increases LSA flooding c) Disables SPF d) Blocks Type 5 LSAs
Answer: a) Limits the number of LSAs a router can process
90
Which OSPF feature prevents route loops in multi-area designs? a) Split Horizon b) Route Summarization c) LSA Filtering d) Inter-area route calculation
Answer: d) Inter-area route calculation
91
What happens if an OSPF router receives its own LSA? a) It floods the LSA further b) It discards the LSA c) It triggers SPF d) It sends an LSAck
Answer: b) It discards the LSA
92
Which command filters OSPF routes between areas? a) area filter-list prefix in/out b) ospf filter area c) filter-list ospf d) ip ospf filter
Answer: a) area filter-list prefix in/out
93
What is the purpose of the capability vrf-lite command in OSPF? a) Enables OSPF for MPLS VPNs b) Disables OSPF for VRFs c) Allows OSPF in VRF-lite environments d) Blocks OSPF in VRFs
Answer: c) Allows OSPF in VRF-lite environments
94
Which OSPF feature allows load balancing across equal-cost paths? a) ECMP (Equal-Cost Multi-Path) b) Unequal-Cost Load Balancing c) LSA Flooding d) SPF Throttling
Answer: a) ECMP (Equal-Cost Multi-Path)
95
What is the default maximum number of equal-cost OSPF paths? a) 2 b) 4 c) 8 d) 16
Answer: b) 4
96
Which command changes the maximum OSPF ECMP paths? a) maximum-paths b) ospf max-paths c) ip ospf maximum-paths d) set ospf paths
Answer: a) maximum-paths
97
What is the purpose of OSPF "stub router" configuration? a) Forces the router to become a DR b) Advertises high costs to avoid transit traffic c) Blocks all LSAs d) Disables OSPF
Answer: b) Advertises high costs to avoid transit traffic
98
Which command configures an OSPF stub router? a) ospf stub-router b) max-metric router-lsa c) stub router d) ip ospf stub
Answer: b) max-metric router-lsa
99
What is the purpose of OSPF "prefix suppression"? a) Reduces LSA flooding for loopbacks b) Blocks all LSAs c) Disables OSPF on interfaces d) Forces DR election
Answer: a) Reduces LSA flooding for loopbacks
100
Which command enables OSPF prefix suppression? a) prefix-suppression under OSPF process b) ip ospf prefix-suppression c) ospf suppress-prefix d) suppress-prefix
Answer: a) prefix-suppression under OSPF process
101
What is the primary difference between OSPFv2 and OSPFv3? a) OSPFv3 supports IPv6 b) OSPFv3 uses TCP c) OSPFv3 has no LSAs d) OSPFv3 does not require areas
Answer: a) OSPFv3 supports IPv6
102
Which multicast address does OSPFv3 use? a) FF02::5 b) FF02::6 c) FF02::9 d) FF02::A
Answer: a) FF02::5
103
Which command enables OSPFv3 on an interface? a) ipv6 ospf area b) ospfv3 enable c) ip ospfv3 enable d) ipv6 ospf enable
Answer: a) ipv6 ospf area
104
Does OSPFv3 require a router ID? a) No, it uses IPv6 addresses b) Yes, it still uses a 32-bit RID c) Only if configured d) No, it uses MAC addresses
Answer: b) Yes, it still uses a 32-bit RID
105
Which OSPFv3 LSA type carries IPv6 prefix information? a) Type 8 (Link-LSA) b) Type 9 (Intra-Area-Prefix-LSA) c) Type 1 (Router-LSA) d) Type 5 (AS-External-LSA)
Answer: b) Type 9 (Intra-Area-Prefix-LSA)
106
What is the purpose of OSPFv3 "Instance ID"? a) Allows multiple OSPF instances on a link b) Replaces the router ID c) Disables OSPFv3 d) Forces DR election
Answer: a) Allows multiple OSPF instances on a link
107
Which command verifies OSPFv3 neighbors? a) show ipv6 ospf neighbor b) show ospfv3 neighbor c) show ip ospf neighbor d) show neighbor ospfv3
Answer: a) show ipv6 ospf neighbor
108
Which OSPFv3 feature is equivalent to OSPFv2 "stub areas"? a) NSSA b) Totally Stubby c) Stub areas (same concept) d) No equivalent
Answer: c) Stub areas (same concept)
109
Can OSPFv2 and OSPFv3 run simultaneously on a router? a) No b) Yes, but with different process IDs c) Only if using VRF d) Only on different interfaces
Answer: b) Yes, but with different process IDs
110
Which command displays OSPFv3 LSDB? a) show ipv6 ospf database b) show ospfv3 database c) show ip ospf database d) show database ospfv3
Answer: a) show ipv6 ospf database
111
What is the OSPFv3 equivalent of network statements? a) Interface-based activation b) ipv6 ospf network commands c) Redistribution d) OSPFv3 does not use networks
Answer: a) Interface-based activation
112
Does OSPFv3 support authentication? a) No b) Yes, using IPv6 IPSec c) Only MD5 d) Only plaintext
Answer: b) Yes, using IPv6 IPSec
113
Which command enables OSPFv3 on a router globally? a) ipv6 router ospf b) router ospfv3 c) ospfv3 enable d) ip ospfv3 enable
Answer: a) ipv6 router ospf
114
What is the OSPFv3 default hello interval on broadcast networks? a) 5 seconds b) 10 seconds c) 30 seconds d) 60 seconds
Answer: b) 10 seconds
115
Which OSPFv3 LSA type describes AS-external routes? a) Type 5 b) Type 7 c) Type 8 d) Type 9
Answer: a) Type 5 (AS-External-LSA)
116
What is the purpose of OSPFv3 "Link-LSA" (Type 8)? a) Carries link-local addresses b) Describes inter-area routes c) Replaces Router-LSA d) No longer used
Answer: a) Carries link-local addresses
117
Which command redistributes routes into OSPFv3? a) redistribute under OSPFv3 b) ospfv3 redistribute c) import d) redistribute ospfv3
Answer: a) redistribute under OSPFv3
118
What is the OSPFv3 default cost reference bandwidth? a) 10^8 (100 Mbps) b) 10^9 (1 Gbps) c) 10^10 (10 Gbps) d) Same as OSPFv2
Answer: d) Same as OSPFv2 (10^8)
119
Which command debugs OSPFv3 packets? a) debug ipv6 ospf b) debug ospfv3 packets c) debug ip ospfv3 d) debug ospfv3
Answer: a) debug ipv6 ospf
120
What is the OSPFv3 equivalent of show ip ospf interface? a) show ipv6 ospf interface b) show ospfv3 interface c) show interface ospfv3 d) show ip ospf interface ipv6
Answer: a) show ipv6 ospf interface

cisco (16 decks)

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