Ccie Written Route/switch 4.0

Front 1

OSPF is what type of routing protocol?

Back 1

Link State

Front 2

OSPF maintains three tables what are they?

Back 2

Neighbor Table
Topology Table
Routing Table

Front 3

What ip protocol is OSPF?

Back 3

IP Protocol 89

Front 4

What defines an OSPF Area Border Router (ABR)?

Back 4

Interfaces in multiple areas - one must be in area zero.

Front 5

What defines an OSPF Autonomous System Boundary Router?

Back 5

Router that connects outside our autonomous system.

Front 6

What defines an OSPF internal router?

Back 6

An internal router has all interfaces in a single area.

Front 7

What defines an OSPF backbone router?

Back 7

A backbone router is any router that has an interface in area zero.

Front 8

True/False - OSPF routers will only form neighbors with routers in the same area?

Back 8

True.

Front 9

How is the OSPF router id determined?

Back 9

Highest Active Interface (ip address) when OSPF starts.
Loopback beat physical interfaces.
OSPF Router id changes when the process is restarted or the router is rebooted.
Cisco Recommended Best Practice - hard code the router id using the router-id command

Front 10

What the states of OSPF that occur during neighbor formation?

Back 10

Down
Init
Two Way
Exstart
Loading
Full

Front 11

True/False - OSPF hellos are sent every 30 seconds on broadcast networks?

Back 11

False - Default hello is sent every 10 seconds on broadcast networks.

Front 12

True/False - OSPF hellos are sent every 10 seconds on point to point networks?

Back 12

True

Front 13

True/False - OSPF hellos are sent every 30 seconds on NBMA networks?

Back 13

True

Front 14

What information contained in OSPF hello packets must match for neighbors to form?

Back 14

Hello/Dead timers
Network Mask
Area ID
Authentication Password
MTU
Stub flags
network types must be compatible

Front 15

True/False - OSPF network types must be compatible for neighbors to form?

Back 15

True

Front 16

True/False - the OSPF router-id must be unique?

Back 16

True

Front 17

What are the two OSPF convergence timers?

Back 17

Hello and Dead timer.

Front 18

What is reset each time an OSPF hello packet is received?

Back 18

The Dead timer. If the dead timer expires the neighbor is deleted.

Front 19

Ture/False - OSPF uses bandwidth based on cost as a metric?

Back 19

True

Front 20

True/False - OSPF uses bandwidth as a metric?

Back 20

False - OPSF uses a cost that is based upon bandwidth as a metric.

Front 21

What is the OSPF cost associated with a 56K link?

Back 21

1785

Front 22

What is the OPSF cost associated with a 64K link?

Back 22

1562

Front 23

What is the OSPF cost associated with a T1 link?

Back 23

65

Front 24

What is the OSPF cost associated with an E1 link?

Back 24

48

Front 25

What is the OSPF cost associated with an ethernet link?

Back 25

10

Front 26

What is the OSPF cost associated with a Fast Ethernet link?

Back 26

1

Front 27

True/False - OSPF DR/BDR election is based upon router-id and router-priority?

Back 27

True

Front 28

True/False - OSPF DR/BDR election is based upon router-priority?

Back 28

False - OSPF DR/BDR election is based upon router-id and router-priority.

Front 29

What is the multicast address used to send updates to the OSPF DR/BDR?

Back 29

224.0.0.6

Front 30

Which OSPF router sends updates to all routers on a multiaccess network?

Back 30

DR - The BDR does nothing until the DR goes off-line.

Front 31

True/False - Preemption is a configurable option with DR/BDR election?

Back 31

False

Front 32

What is the DROther router in an OSPF area?

Back 32

Any router that is not the DR/BDR.

Front 33

What multi-cast address is used on point to point links for the router's to communicate OSPF information?

Back 33

224.0.0.5

Front 34

OSPF DR/BDR router priority defaults to what value?

Back 34

1

Front 35

What are the major OSPF network types?

Back 35

Broadcast Multi-access
Point to Point
Non-Broadcast Multi-access

Front 36

Name the two Non Cisco proprietary NBMA OSPF modes?

Back 36

non-broadcast NBMA
point to multipoint NBMA

Front 37

Name the three Cisco proprietary NBMA OSPF modes?

Back 37

Broadcast NBMA
point to multi-point non broadcast
point to point

Front 38

What effect does the point to point network type have on a loop back interface?

Back 38

It advertises network as a stub host with a 32 host route mask.

Front 39

True/False OSPF DR and BDR are used to minimize LSA replication

Back 39

True

Front 40

True/False Updates are set to all OSPF routers including the DR and BDR using multicast address 224.0.0.6?

Back 40

False - Updates are only sent to the DR and BDR

Front 41

What multicast address does the OSPF DR send updates to?

Back 41

224.0.0.5

Front 42

How is the OSPF DR/BDR election handled?

Back 42

election based on priority and router-id
Router Priority
-Highest priority wins election
-Defaults to 1
-0 is never
Router-id
-highest loopback/interface ip
-can be statically set
-higher better

Front 43

Name six OSPF packet types

Back 43

Hello, Database Description, Link State Request, Link State Advertisement, Link State Update, Link State Acknowledgement

Front 44

Which OSPF network types include DR/BDR election?

Back 44

NBMA
Broadcast

Front 45

Which OSPF network types do not include DR/BDR election?

Back 45

Point to Multipoint
Point to Multipoint Non broadcast
Point to Point

Front 46

What is the Hello/Dead interval for OSPF NBMA mode?

Back 46

30/120

Front 47

What is the Hello/Dead interval for OSPF Point to multipoint mode?

Back 47

30/120

Front 48

What is the Hello/Dead interval for OSPF Point to Multipoint Non-broadcast mode?

Back 48

30/120

Front 49

Which OSPF Network Type do you not need to manually set the neighbors?

Back 49

Broadcast
point to multipoint
point to point

Front 50

What is the Hello/Dead interval for OSPF point to point mode?

Back 50

10/40

Front 51

Which OSPF Network types do you need to manually set the neighbors?

Back 51

NBMA
point to multipoint Non Broadcaset

Front 52

What is an OSPF LSA type 1?

Back 52

Router LSA
router links and states
flooded in area of orgin

Front 53

What is an OSPF LSA type 2?

Back 53

Network LSA
DR Generated
advertise routers
lists all attached routers
flooded in area of origin

Front 54

What is an OSPF LSA type 3?

Back 54

Summary LSA
ABR summary router
sent into an area to advertise prefixes in other areas
flooded throughout the autonomous system

Front 55

What is an OSPF LSA type 4?

Back 55

summary LSA
ASBR Location - advertises the ASBR
actually sent by the ABR
flooded throughout the autonomous system

Front 56

What is an OSPF LSA type 5?

Back 56

External LSA
ASBR Summary Route
routes that are redistributed into ospf
different routing protocol
different ospf instance
static routes

Front 57

What is an OSPF LSA type 7?

Back 57

NSSA external routes
generated bu the ASBR in not-so-stubby area
advertises external destinations

Front 58

What is an OSPF stub area?

Back 58

removes LSA type 4 and 5 (external) advertisements

Front 59

What is an OSPF totally stubby area?

Back 59

removes interarea (LSA 3)
removes external (LSA 4 & 5)
ABR originates default route

Front 60

What is a Not So Stubby Area?

Back 60

Passes external routes through via a type 7 LSA, which converts back to type 5 once they reach the backbone (ABR).
all routers must agree on NSSA
ABR does not originate default

Front 61

What is a Totally Not So Stubby Area?

Back 61

removes inter-area (lsa 3)
removes external (lsa 4&5)
ABR originates default
allows redistribution into NSSA (LSA7)

Front 62

True/False -OSPF N1 routes increment metric as the route passes through the Autonomous System?

Back 62

True

Front 63

True/False - OSPF N2 routes increment metric as the route passes through the Autonomous System

Back 63

Fales.