OSPF Routing Protocol Q/A's Flashcards Preview

Cisco CCNA Concepts & Theory > OSPF Routing Protocol Q/A's > Flashcards

Flashcards in OSPF Routing Protocol Q/A's Deck (24)
Loading flashcards...
1

OSPF uses link cost and speed to calculate it's routing metric? True / False

What does OSPF stand for?

True

Open Shortest Path First

2

What type of advertisement does OSPF use to pass routing updates?

(LSA) Link State Advertisements

3

In what order does OSPF Operate from 1 - 6?

Discover What?
Form What?
Flood What?
Compute What?
Install What?
Respond to What?

1. Discover Neighbors
2. Form Adjacencies
3. Flood Link State Database (LSDB)
4. Compute Shortest Path
5. Install best routes in the routing table
6. Respond to network changes

4

What do Link State Advertisements LSA advertise?

routing updates

5

What are Link State Updates responsible for exchanging?

topology information

6

What identifies a router using OSPF?

router id

7

What is the cost of OSPF actually derived from?

bandwidth/interface bandwidth

8

What is the default cost on "All OSPF" routers?

1

9

When making changes to OSPF it is recommended to modify the cost not what?

bandwidth

10

Hello interval is the time in which, what are sent out?

hello packets

11

What is a dead interval?

Time in which router is declared out of service.

12

The router priority is used to select what types of routers for OSPF?

(DR) and (BDR)

Designated Router & Backup Designated Router

13

What must match for OSPF to form an adjacency?

Same two what?
What two intervals?
What subnet?
What type of flag?
What type of area flag?

Same area and network
Hello and dead intervals
IP subnet
authentication flag
stud area flag

14

The DR and BDR establishes a full neighbor state with all routers on the network segment. True of False

The neighbor state on other neighbors remain in what state, and do not exchange what with each other?

true

2-way state and do not exchange routes

15

What is the Designated Router multicast IP address for (all ospf routers)

224.0.0.5

16

Routers in their OSPF area maintain full or summary information about it's own area?

Routers in other OSPF area maintain full or summary information about other areas?

Full information

Summary information

17

What do backbone routers maintain for each area and links in their own area?

Full Link State Databases (LSDB)

18

An ABR Area Border Router is used to connect to what on a OSPF network?

one or more areas to the main backbone

19

It is ideal to have each ABR connected to how many areas only?

two

20

What is area ID?

Area configured in an OSPF network

21

Do ABR's automatically summarize routes?

What would happen if ABR's routers were not summarized?

No

All routes would be flooded everywhere

22

An External AS in OSPF is used in an Autonomous System Boundary Routers (ASBR) to do what?

advertise external routing information throughout the AS

23

Do routers use the lowest or highest IP address with longest or shortest prefix to elect the router ID?

highest IP address with longest prefix

24

OSPF is what kind of routing protocol?

Link State