Cisco 3 Chapter 9

ASBR

A router that has at least one interface attached to an external internetwork.

type 1

A type 4 LSA originates as a(n) ___ ___ LSA before crossing into another area.

OSPF area

A(n) ____ ____ is a group of routers that share the same link-state information in their link-state databases.

backbone area interarea <- this word looks weird to me, I feel like it should be written as inter-area

All traffic moving from one area to another area must traverse the ____ ____. This traffic is referred to as ____ traffic.

LSA type 4

An ABR in a multiarea OSPF network receives LSAs from its neighbor that identify the neighbor as an ASBR with learned external networks from the Internet. Which LSA type would the ABR send to other areas to identify the ASBR, so that internal traffic that is destined for the Internet will be sent through the ASBR? LSA type 1 LSA type 2 LSA type 3 LSA type 4 LSA type 5

link-state information link-state databases

An OSPF area is a group of routers that share the same ____-____ ____ in their ____-____ ____.

link-state information

An OSPF area is a group of routers that share the same ____-____ ____ in their link-state databases.

link-state databases

An OSPF area is a group of routers that share the same link-state information in their ____-____ ____.

backbone (transit) area

An OSPF area whose primary function is the fast and efficient movement of IP packets.

O IA

An OSPF router has received type 3 summary LSAs that were flooded into an area. How are these LSAs identified in the routing table? O E2 O E1 O O IA

regular transit

By default, a ____ area does not allow traffic from another area to use its links to reach other areas. All traffic from other areas must cross a ____ area

Yes, if it believes in itself.

Can a router be backbone router, ABR and an ASBR at the same time?

A) 3 E) Three

Choose the best answer(s). A router should not be in more than this many areas. A) 3 B) Two C) One D) Five E) Three F) 4 E) None of the above

D) 50

Choose the best answer(s). An area should have no more than this many routers. A) 1 B) 3 C) 5 D) 50 E) 60 F) None of the above

D) LX - ROMAN NUMERALS!!!! F) 60

Choose the best answer(s). Any single router should not have more than this many neighbors. A) Fifty B) 40 C) 3 D) LX E) Five F) 60 G) None of the above

No

Does receiving a type 3 LSA into an area cause the router to run the SPF algorithm?

0

Hierarchical networking defines area ____ as the core to which all other areas directly connect

1 - Router LSA 2 - Network LSA 3 and 4 - Summary LSA 5 - AS External LSA

Identify OSPF LSA Types 1-5.

Any network that is not part of the OSPF routing domain.

In OSPF what defines an external network?

LSDBs

Internal routers in an area must have identical ____.

LSDB

LSAs are the building blocks of the OSPF ____.

LSA type 1 - (F) including a list of directly attached network prefixes and link type LSA type 2 - (B) identifying the routers and the network address of the multiaccess link LSA type 3 - (E) advertising networks from other areas by ABRs LSA type 4 - (D) advertising an ASBR to other areas and providing a route to it LSA type 5 - (A) advertising external (non-OSPF) network addresses

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 1 LSA type 2 LSA type 3 LSA type 4 LSA type 5 A) advertising external (non-OSPF) network addresses B) identifying the routers and the network address of the multiaccess link C) advertising multicast group memberships D) advertising an ASBR to other areas and providing a route to it E) advertising networks from other areas by ABRs F) including a list of directly attached network prefixes and link type

Calculate intra-area OSPF routes

Step 1 for OSPF best path calculations.

Calculate the best path to interarea OSPF routes

Step 2 for OSPF best path calculations.

Calculate the best path routes to external non-OSPF networks

Step 3 for OSPF best path calculations.

type 2

The ____ ____ LSA contains the router ID and IP address of the DR, along with the router ID of all other routers on the multiaccess segment.

Type 3

These LSAs describe a network address learned by type 1 LSAs.

ABRs ASBRs

These OSPF routers are attached to multiple areas.

type 4 external bit (e bit)

This LSA includes a special bit known as the ____ ____ that is used to identify the router as an ASBR.

type 4

This LSA is used to advertise a route to an ASBR.

type 5

This LSA is used to advertise external network addresses.

Type 2

This LSA type is for multiaccess and non-broadcast multiaccess networks where there is a DR elected and at least two routers on the multiaccess segment.

O IA

This OSPF routing table entry shows that the route is a summary, interarea route.

O E1 O E2

This OSPF routing table entry shows that the route is external.

O

This OSPF routing table entry shows that the route is intra-area.

regular (non-backbone) area

This area connects users and resources and is usually set up along functional or geographical groupings.

transit also Area 0

This is another term for the backbone area.

regular

This is another term for the non-backbone area.

route redistribution

This is the process when an ASBR imports and exports external network information to the OSPF network.

True

True or False OSPF does not perform route summarization by default.

True

True or False Type 1 LSAs are also called router link entries.

False, they are flooded only to the areas in which they originated.

True or False Type 1 LSAs are flooded to any area in which are needed.

False Type 2 LSAs are also called network link entries. Type 1 LSAs are called router link entries.

True or False Type 2 LSAs are also called router link entries.

external

Type 5 LSAs are also know as ____ LSA entries.

Internal Backbone Area Border Router (ABR) Autonomous System Boundary Router (ASBR)

What are the four types of OSPF routers?

the route to reach an ASBR

What information is advertised in a type 4 LSA? the router ID of the DR the route to reach an ASBR networks reachable outside the OSPF domain networks reachable outside the local area

Topology changes in one area do not cause SPF recalculations in other areas.

What is a benefit of multiarea OSPF routing? Topology changes in one area do not cause SPF recalculations in other areas. Automatic route summarization occurs by default between areas. Routers in all areas share the same link-state database and have a complete picture of the entire network. A backbone area is not required.

Area 0

What must all non-backbone OSPF areas connect to when deploying multiarea OSPF? Area 1 a DR an ASBR Area 0

type 1

Which LSA type advertises directly connected OSPF-enabled links to other OSPF routers within the OSPF area they originated? type 1 type 2 type 3 type 4

type 2

Which LSA type is flooded by a designated router to other OSPF routers within the same area? type 1 type 2 type 3 type 4

ABRs

Which routers distribute routing information into the backbone and forward information to each other?

OSPF routers within an area have the same link-state information. OSPF routers may have large routing tables if routes are not summarized.

Which two statements describe OSPF? (Choose two.) OSPF performs automatic route summarization by default. OSPF must be implemented in a three-layer area hierarchy. OSPF routers within an area have the same link-state information. OSPF routers may have large routing tables if routes are not summarized. OSPF uses the SPF algorithm, which requires few CPU cycles.

type 1 type 2

Which two types of LSAs are flooded only within the area in which they originated? (Choose two.) type 1 type 2 type 3 type 4 type 5

hierarchical

Which type of network design is required for OSPF?

O E2

Which type of routing table entry would indicate that an external route was redistributed into the multiarea OSPF process? O O IA O E2 S C

Type 3

___ ___ LSAs are used by ABRs to advertise networks from other areas.

LSAs

____ are the building blocks of the OSPF LSDB.