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Exam 300-101 topic 2 question 607 discussion

Actual exam question from Cisco's 300-101
Question #: 607
Topic #: 2
[All 300-101 Questions]

Given the following partial configuration for Router A:
interface serial 0
ip address 10.1.1.1 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint
router ospf 7
network 10.1.1.0 0.0.0.255 area 0
Which two statements are correct? (Choose two.)

  • A. DR/BDR elections do not take place.
  • B. The area 0 NBMA cloud is configured as more than one subnet.
  • C. The router is restricted to a hub and spoke topology.
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Suggested Answer: D. OSPF neighbor statements are not necessary. 🗳️
In an OSPF Point-to-Multipoint environment, DB/BDR elections do not take place. The neighbor command became somewhat obsolete with the introduction of the capability to configure other network modes for the interface, regardless of the underlying physical topology.
Reference: Building Scalable Cisco Networks (Cisco Press) page 130 and 181 Point-to-Multipoint Network:
Point-to-multipoint is a single interface that connects to multiple destinations. The underlying network treats the network as a series of point-to-point circuits. It replicates LSA packets for each circuit. OSPF traffic is sent as multicast. There is no DR or BDR election. This technology uses one IP subnet for all endpoints on the network.
By default, the network is considered to be a series of point-to-point interfaces. There is no need to specify neighbors, because the neighbors will see each other and simply become adjacent, with no need for the election of a DR or a BDR. Point-to-multipoint does not try to reduce adjacencies using a DR. Instead, it accepts the extra overhead of having a full set of adjacencies for the sake of stability. Point-to-multipoint forms an adjacency automatically along any PVC, which causes more overhead but is more resilient than NBMA.
by diegonamaste at Feb. 21, 2020, 12:27 a.m.

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diegonamaste
5 years, 2 months ago
A. DR/BDR elections do not take place. D. OSPF neighbor statements are not necessary.
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