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Zorluk: KolayOSPFv2 Network Types and DR/BDR Selection

A network administrator is evaluating OSPFv2 operations across different interface types on Cisco routers. Which two statements accurately describe the characteristics and behavior of the OSPFv2 point-to-point network type compared to the broadcast multiaccess network type? (Choose two.)

  1. OSPFv2 suppresses the election of a Designated Router (DR) and Backup Designated Router (BDR) on point-to-point interfaces.Cevap
  2. Point-to-point interfaces use default Hello and Dead timers of 10 seconds and 40 seconds, matching default broadcast network timers.Cevap
  3. C
    Interfaces configured as point-to-point automatically change their OSPF priority to 0 to prevent participation in DR elections.
  4. D
    Point-to-point interfaces require manual neighbor configuration using the unicast neighbor command to form adjacencies.
  5. E
    A DR and BDR election will take place on a point-to-point link only if the interface OSPF priority is set to a non-zero value.

Cevap

The two correct statements are that OSPFv2 does not elect a DR/BDR on point-to-point network types, and point-to-point network types use default Hello and Dead timers of 10 seconds and 40 seconds.
The statements confirming that OSPFv2 suppresses DR/BDR elections on point-to-point interfaces and that point-to-point interfaces use 10-second Hello / 40-second Dead timers are correct. On point-to-point links, only two routers exist, so full mesh adjacency overhead is not an issue, rendering DR/BDR roles redundant. Furthermore, standard Ethernet point-to-point links default to 10s/40s timers identical to broadcast multiaccess links.

Adım Adım Çözüm

1
Analyze DR/BDR election requirements across OSPF network types.
Broadcast multiaccess networks elect a DR and BDR to reduce adjacency overhead on shared segments. Point-to-point links connect exactly two devices, making DR/BDR elections unnecessary.
Recognizing that point-to-point interface mode bypasses DR/BDR selection is fundamental to OSPF network design.
2
Verify default timer values for OSPFv2 network types.
Both broadcast and point-to-point network types default to a Hello timer of 10 seconds and a Dead timer of 40 seconds (4 times the Hello interval).
Timer consistency across matching network types ensures neighbors form adjacencies without timer mismatches.

Anahtar Kavram

OSPFv2 Point-to-Point vs Broadcast Network Type Characteristics
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Konular

OSPFv2 Network Types and DR/BDR Selection

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