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WorksheetsMultiarea OSPF
Total questions: 20
Worksheet time: 4mins
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
OSPF is a hierarchical routing protocol that logically divides the network into subdomains referred to as _____
Broadcast Domain
VLAN
Areas
Loopbacks
Choose correct TERMS used to identify routers within multi-area OSPF: (MULTIPLE ANSWERS)
ABR
ASBR
BACKBONE
BDR
Multi-area OSPF support ___ layer area hierarchy.
1
2
3
4
ABR generate LSA type _____ to adertise network from other areas.
1
2
3
4
ABR generate LSA type ____ to identify an ASBR and provide a route to it.
1
2
3
4
Inter area route summarization will occurs on _____ router.
ABR
ASBR
CORE
INTERNAL
Choose the correct inter area summary command in OSPFv3:
Router(config-router)#area 8 network 2001:ABCD:A001::/50
Router(config-router)# area 8 range 2001:ABCD:A001::/50
Router(config-router)# area 8 range 2001:ABCD:A001::
Router(config-router)# area 8 range 192.168.0.0 255.255.248.0
Choose the correct inter area summary command in OSPFv2:
Router(config-router)#area 55 range 192.168.55.0
Router(config-router)# area 55 net 192.168.55.0 255.255.255.192
Router(config-router)# area 55 range 192.168.55.0 255.255.255.192
Router(config-router)# area 55 range 192.168.55.0 0.0.0.0
