ICND1 OSPF Configuration 4

Question 1

Which command sets the OSPF reference bandwidth to 1000 Mbps to correctly calculate costs for Gigabit interfaces?

Accepted Answer

auto-cost reference-bandwidth 1000

Answer

'auto-cost reference-bandwidth 1000' under the OSPF process sets the reference to 1000 Mbps, giving GigE interfaces a cost of 1.

Question 2

What is the multicast address used by OSPF Designated Routers and Backup Designated Routers?

Accepted Answer

224.0.0.6

Answer

224.0.0.6 is the AllDRouters multicast address used to send updates specifically to the DR and BDR.

Question 3

A network engineer needs to advertise a default route into OSPF. Which command accomplishes this?

Accepted Answer

default-information originate

Answer

'default-information originate' under the OSPF process redistributes a default route into the OSPF domain.

Question 4

Which OSPF neighbor state indicates that routers have exchanged DBD packets and are now requesting missing LSAs?

Accepted Answer

Loading

Answer

In the Loading state, routers send LSR packets to request specific LSAs that were identified as missing during Exchange.

Question 5

What is the effect of configuring 'ip ospf priority 0' on an interface?

Accepted Answer

The router is ineligible to become the DR or BDR

Answer

An OSPF priority of 0 makes the router ineligible to become either the Designated Router or Backup Designated Router.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test