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Advanced Networking > OSPF > Flashcards

OSPF Flashcards

1
Q

What are the issues with large single area OSPF configuration

A
  • large routing table
  • large link state database (topology)
  • frequent SPF routing calculations
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2
Q

In MOSPF, what are the routers which are connected to the backbone and to the other areas called?

A

Area border routers

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3
Q

OSPF route summarization is enabled by default

A

False

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4
Q

Internal routers in the same area have identical LSDB’s

A

True

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5
Q

OSPF supports automatic summarization between areas

A

False

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6
Q

OSPF supports automatic summarization for external routes injected with ASBR

A

False

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7
Q

What are LSA’s used for?

A

Exchanging routing information between OSPF peers

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8
Q

What are LSA’s (link state advertisement) carried inside of?

A

LSU (link state update) messages

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9
Q

All routers generate type 1 LSA’s

A

True

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10
Q

What types of routers are in OSPF?:

A
  • designated routers
  • backup designated routers
  • designated router other (DROTHER)
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11
Q

What OSPF router type can send type 2 network LSA’s?

A

designated routers

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12
Q

What are LSA type 2 messages used for?

A

inform routers of the router ID of the DR in each area, and shows a list of attached routers

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13
Q

What type of LSA’s do area border routers propagate?

A
  • Type 3 OSPF summary
  • type 4 OSPF ABR summary
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14
Q

What is the OSPF Adjacency Table used for?:

A
  • Neighbour table
  • lists all neighbour routers
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15
Q

What is the OSPF Link State Database used for?:

A
  • topology table
  • this is the same across all routers in same area
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16
Q

What is the OSPF Forwarding Database used for?:

A
  • routing table
17
Q

What is a routing metric?

A

a measurable value that is assigned to different routes based on the usefulness of that route

18
Q

What is an OSPF best path?:

A

a route with the lowest cost

19
Q

How is OSPF cost calculated?:

A

based on bandwidth

20
Q

What problems do Classful routing protocols have?:

A
  • subnet mask information is not sent
  • variable length subnet masks are not supported
  • creates problems in dis-contiguous networks
21
Q

Classless routing protocols include subnet mask information in updates and support VLSMs

A

True

22
Q

Link-state protocols only send updates when there is a topology change (no periodic updates)

A

True

23
Q

What are the 5 types of OSPF packets?:

A
  • hello
  • database description (DBD)
  • link state request (LSR)
  • link state update (LSU)
  • link state acknowledgement (LSAck)
24
Q

Which OSPF packet type contains LSAs?:

A

LSUs

25
Q

What purpose do LSU packets have?:

A
  • forward OSPF routing updates
  • send specifically requested link state records
26
Q

What purpose do hello packets have?:

A
  • discover OSPF neighbours
  • form neighbour adjacencies
  • advertise network parameters
  • elect DR and BDR on multiaccess networks (P2P does not require DRs and BDRs)
27
Q

A neighbour adjacency will form between 2 routers if the hello and dead timers are different

A

False

28
Q

What is the all routers multicast address that the DR uses to send hello packets?:

A

224.0.0.5

29
Q

What information does the “show ip protocols” command display?:

A
  • which interfaces are passive
  • OSPF process id
  • router id
  • routed networks
  • active interfaces
  • gateway routers
30
Q

What does the command “passive-interface default” do?:

A

makes all interfaces passive

31
Q

Which multiaccess network do DROTHERs use to send OSPF packets to the (B)DR?:

A

224.0.0.6

32
Q

Only the DR and BDR listen to the 224.0.0.6 address

A

True

33
Q

What information will the command “show ip ospf interface” display?:

A
  • priority
  • router state (DR, BDR, DROTHER)
  • neighbour adjacencies
  • DR and BDR router ids
34
Q

hello packets are sent on passive interfaces

A

False

Advanced Networking (7 decks)

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