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Networking > OSPF > Flashcards

OSPF Flashcards

1
Q

what type of routing protocol is OSPF

A

Link-state

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2
Q

OSPF algorithm

A

Dijkstra

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3
Q

What metric does OSPF use

A

Cost

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4
Q

AD for OSPF

A

110

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5
Q

IP transport used for OSPF

A

88

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6
Q

OSPF authenitcation

A

MD5

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7
Q

ALL routers broadcast address

A

224.0.0.5

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8
Q

DR routers broadcast address

A

224.0.0.6

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9
Q

OSPF cost calculation

A

ref bw / int bw (100 / 10mb)

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10
Q

OSPF adj states (8) (d,a,i,2,ex,ex,L,F)

A

down, attempt, init, 2-way, exstart, exchange, loading, full

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11
Q

LSA type 1

A

Router link - lists neighboring routers and cost, flooded within an area

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12
Q

LSA type 2

A

Network link - Gen by DR, lists adj area routers, flooded within an area

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13
Q

LSA type 3

A

Network summary - Gen by ABR, advertised among areas

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14
Q

LSA type 4

A

ASBR summary - injected by ABR into backbone to advertise presence of ASBR

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15
Q

LSA type 5

A

Gen by ASBR and flooded throughout AS to advertise route external to OSPF (rip or eigrp or bgp areas)

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16
Q

LSA type 7

A

Gen by ASBR in not-so-stubby-area. converted to type-5 by ABR when leaving the area.

17
Q

Internal Router

A

All interfaces exist in the same area

18
Q

Backbone Router

A

has an interface in Area 0

19
Q

ABR

A

Area Border Router - connects two or more areas

20
Q

ASBR

A

AS Boundary Router - connects to other routing domains (bgp, rip, eigrp)

21
Q

Stub area

A

External LSA-type 5’s are replaced with a default route

22
Q

Totally stubby area

A

type 3,4,5 are replaced with a default route

23
Q

Not so stubby area

A

stub area containing an asbr, type 5 are converted to type 7 within the area

24
Q

OSPF external route type - E1

A

cost to the ASBR plus external cost of the route

25
Q

OSPF external route type - E2

A

default - cost of route as seen by ASBR

26
Q

Hello/Dead timers for NBMA and multi-point

A

30/120

27
Q

Hello/Dead timers for broadcast and p2p

A

10/40

28
Q

OSPF neighborship requirements (a,a,s,t,s)

A

Match: area, auth, subnet, timers, stub

29
Q

OSPF stub gets rid of which route type?

A

O E2 (type 5 external) (networks redistributed in to OSPF, cost 20)

30
Q

What does OSPF total stub area do for routing?

A

Causes all internal and external routes to use a default route to exit the total stub area. Configured on the upstream ABR, not on the TS router. Stops type 3,4,5 LSA’s.

31
Q

What is the criteria to form ospf neighborship (ANTP)

A

Area ID

Network mask

Timers

Authentication Password

32
Q
A

Networking (4 decks)

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