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CCNA > OSPF > Flashcards

OSPF Flashcards

1
Q

Which version of OSPF is in deployment in most modern systems today?

A

V2

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2
Q

Which version of OSPF supports IPv6?

A

V3

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3
Q

What is the selection priority for a router’s OSPF Router ID

A
  1. Manual configuration
  2. Highest IP address on a loopback interface
  3. Highest IP address on a physical interface
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4
Q

What is the command to issue on an ASBR for it to share default route information?

A

default-information originate

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5
Q

What is the command to change the OSPF cost reference bandwidth

A

auto-cost reference-bandwidth reference-bandwidth

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6
Q

Does OSPF reference bandwidth need to be the same across an area?

A

Yes, otherwise the cost calculations get messed up

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7
Q

What is the command to manually configure OSPF cost for a particular interface?

A

ip ospf cost

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8
Q

What is the multicast IP address OSPF hello messages are sent to?

A

224.0.0.5

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9
Q

What are the 4 OSPF neighbor states?

A
  • Down
  • Init
  • 2-way
  • Exstart
  • Exchange
  • Loading
  • Full
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10
Q

What neighbor state do two OSPF routers enter after they receive a hello message with their own Router IDs in them?

A

2-way

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11
Q

What are the main OSPF network types?

A
  • Broadcast
  • Point-to-Point
  • Non-Broadcast
  • Point-to-Multipoint
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12
Q

Broadcast OSPF networks are enabled by default on _____ and _____ connections

A

Ethernet, FDDI

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13
Q

Point-to-Point OSPF networks are enabled by default on _____ and _____ connections

A

PPP, HDLC

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14
Q

Non-Broadcast OSPF networks are enabled by default on ____ and _____ connections

A

Frame Relay, X.25

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15
Q

What is the command to manually configure an interface as a specific OSPF network type?

A

ip ospf network type

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16
Q

In what OSPF network type is a DR and BDR elected?

A

Broadcast

17
Q

What is the selection priority for DR/BDR elections?

A
  1. Highest OSPF interface priority
  2. Highest OSPF router ID
18
Q

How is OSPF interface priority determined?

A

They are the same by default, so manual configuration

19
Q

After a DR and a BDR are chosen, what do all other routers in an OSPF network become?

A

DROther

20
Q

What is the command to change the OSPF priority on an interface?

A

ip ospf priority priority

21
Q

Is OSPF DR/BDR election preemptive or non-preemptive?

A

Non-preemptive

22
Q

Do DROther routers enter the FULL state with other DROther routers?

A

No, they only enter the full state with the DR and the BDR

23
Q

Do DROther routers enter the FULL state with the DR and BDR routers?

A

Yes

24
Q

What is the multicast IP address used to send messages to the DR and the BDR

A

224.0.0.6

25
Q

Do the DR and BDR form a full adjacency?

A

Yes

26
Q

What are the 3 CCNA-relevant OSPF LSA types

A
  • Type 1 (Router LSA)
  • Type 2 (Network LSA)
  • Type 5 (AS External LSA)
27
Q

What is a Type 1 OSPF LSA

A

Router LSA

Used to identify the router using the Router ID, lists networks attached to the router’s OSPF activated interfaces

28
Q

What is a Type 2 OSPF LSA

A

Network LSA

Used by the DR. Lists the routes which are attached to the OSPF broadcast network

29
Q

What is a Type 5 OSPF LSA

A

AS-External LSA

Generated by ASBRs to describe routes to destinations outside the AS

30
Q

What are basic troubleshooting steps for OSPF?

A
  1. Area number must match
  2. Hello and dead timers must match
  3. Interfaces need to be on the same subnet
  4. Ensure OSPF process isn’t shut down
  5. Ensure OSPF RIDs are unique
  6. Ensure authentication settings match
  7. Ensure IP MTU settings match
  8. Ensure OSPF network types match

CCNA (38 decks)

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