3-6: Multiarea OSPF Flashcards
A network administrator is verifying a multi-area OSPF configuration by checking the routing table on a router in area 1. The administrator notices a route to a network that is connected to a router in area 2. Which code appears in front of this route in the routing table within area 1?
O IA
What is one advantage of using multiarea OSPF?
It improves the routing efficiency by reducing the routing table and link-state update overhead.
OSPF type 2 LSA messages are only generated by the __ router to advertise routes in multiaccess networks.
DR
A Type 3 LSA is?
A Summary (ABR)
Which statement describes a multiarea OSPF network?
It has a core backbone area with other areas connected to the backbone area.
Which two statements correctly describe OSPF type 3 LSAs?
- Type 3 LSAs are used to update routes between OSPF areas.
- Type 3 LSAs are generated without requiring a full SPF calculation.
A Type 4 LSA is?
A Summary (ASBR)
Which three steps in the design and implementation of a multiarea OSPF network are considered planning steps?
- Define the OSPF parameters.
- Gather the required parameters.
- Define the network requirements.
The network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are 172.16.8.0, 172.16.10.0, and 172.16.12.0 with subnet masks of 255.255.255.0 for each network. Which command should the administrator use to forward the summary route for area 15 into area 0?
area 15 range 172.16.8.0 255.255.248.0
A Type 1 LSA is?
A Router.
Which two networks are part of the summary route 192.168.32.0/22?
- 192.168.35.0/24
- 192.168.33.0/24
Which command can be used to verify the contents of the LSDB in an OSPF area?
show ip ospf database
When a router belongs to area 0, that router is what type of OSPF router?
Backbone Router
When all interfaces belong to only one area, that router is what type of OSPF router?
Internal Router
What type of router is a router that has at lease one interface that is attaced to a non-OSPF network?
Autonomous System Boundary Router
When a router connects to an external network, that router is what type of OSPF router?
Autnonmous System Boundary Router (ASBR)
A Type 2 LSA is?
A Network
Which characteristic describes both ABRs and ASBRs that are implemented in a multiarea OSPF network?
They are required to perform any summarization or redistribution tasks.
The ________ area interconnects with all other OSPF area types.
Backbone
A network administrator is implementing OSPF in a portion of the network and must ensure that only specific routes are advertised via OSPF. Which network statement would configure the OSPF process for networks 192.168.4.0, 192.168.5.0, 192.168.6.0, and 192.168.7.0, now located in the backbone area, and inject them into the OSPF domain?
r1(config-router)# network 192.168.4.0 0.0.3.255 area 0
What type of router is a router with all of its interfaces in the same area?
Internal Router
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 4
What type of router is a router with its interfaces attached to multiple areas?
Area Border Router
An ASBR generates type _ LSAs for each of its external routes and floods them into the area that it is connected to.
5
What type of router is a router if the backbone area?
Backbone Router
Which command must be issued to configure R1 for multiarea OSPF.?
network 192.168.10.128 0.0.0.127 area 1
What is indicated by the O IA in the router output?
The route was learned from another area.
Which two statements are correct?
- To reach network 192.168.1.0, traffic will exit via the Serial0/0/0 interface.
- The routing table contains routes from multiple areas.
When a router belongs to multiple areas, that router is what type of OSPF router?
Area Border Router (ABR)
What can be concluded about network 192.168.4.0 in the R2 routing table?
The network was learned from a router within the same area as R2.
A Type 5 LSA is?
Autonomous System External
Where can interarea route summarization be performed in an OSPF network?
ABR
