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Flashcards in OSPF Deck (11)
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1
Q

What does the default-information originate and redistribute {network} command do?

A

configures OSPF to inject a router’s default external route into OSPF (router becomes the default route in OSPF), router is then considered an ASBR (Autonomous System Boundary Router).

2
Q

What are Autonomous System Boundary Routers (ASBR)?

A

ASBRs redistributes routes from other routing protocols into the OSPF domain

3
Q

Which type of load balancing does OSPF support.

A

Equal-cost load balancing.

EIGRP supports unequal-cost load balancing

4
Q

What does OSPF use to calculate its cost metric?

A

OSPF uses bandwidth to calculate its cost metric. Higher the bandwidth, the lower the cost

5
Q

What are the 5 OSPF network types?

A
Broadcast
Nonbroadcast
Point-to-point
Point-to-multipoint broadcast
Point-to-multipoint nonbroadcast
6
Q

Describe OSPF Broadcast network types

A

Elections are performed
multicast updates are sent, manual config of neighbor routers NOT required.
Hello = 10s, Dead = 40s
Default on Fiber Distributed Data Interface (FDDI) and all Ethernet

7
Q

Describe OSPF Nonbroadcast network types

A

DR and BDR elections, no multicast, manual config of neighbors for unicast updates
Hello = 30s, Dead = 120s
Default on Frame Relay and X.25

8
Q

Describe OSPF Point-to-point network types?

A

No DR and BDR elections, multicast updates, manual config of neighbors NOT required
Hello = 10s, Dead = 40s
Default on High-Level Data Link Control (HDLC) and Point-to Point Protocol (PPP)

9
Q

Describe OSPF Point-to-multipoint broadcast network types?

A

No DR and BDR elections, multicast updates, manual config of neighbors NOT required
Hello = 30s, Dead = 120s

10
Q

Describe OSPF Point-to-multipoint nonbroadcast network types?

A

No DR and BDR elections, no multicast, manual config of neighbors required
Hello = 30s, Dead = 120s

11
Q

(OSPF) What must happen for routers to form an adjacency?

A
Router IDs must be unique (if not manually configured: will be highest loopback. If not configured: will be highest IP interface)
(EIGRP Router IDs must match)
OSPF Area must match
In the same subnet
Dead timer should not match Hello timer