What is used to facilitate hierarchical routing in OSPF?

• frequent SPF calculations

• autosummarization

• the election of designated routers

• the use of multiple areas

What are two reasons for creating an OSPF network with multiple areas? (Choose two.)

• to simplify configuration

• to reduce SPF calculations

• to reduce use of memory and processor resources

• to provide areas in the network for routers that are not running OSPF

• to ensure that an area is used to connect the network to the Internet

What is indicated by the O IA in the routing table?

• The route was manually configured.

• The route was learned from outside the internetwork

• The route was learned from within the area

• The route was learned from another area.

Which are the building blocks of OSPF?

• LSA

• LSU

• DR

• hello messages

In multi area OSPF, area 0 is also called as __________

• regular area

• backbone area

• stub area

• non backbone area

It is a router that has all of its interfaces in the same area.

• ABR

• internal router

• backbone router

• ASBR

All routers advertise their directly connected OSPF-enabled links in a type ______ LSA and forward their network information to OSPF neighbors.

• 2

• 3

• 1

• 4

Type _________ LSAs are originated by the ASBR and are flooded to the entire autonomous system.

• 2

• 5

• 3

• 4

In multiarea, OSPF, a router can be classified as more than one router type. For example, a router can act as a backbone router, an ABR, and an ASBR at the same time.

• True

• False

What are reasons for creating OSPF in a hierarchical design? (MULTIPLE ANSWERS)

• Smaller routing tables

• To confine network instability to single areas of the network

• Reduced link-state update overhead

• Increase frequency of SPF calculations