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Zorluk: OrtaRouting Concepts and Dynamic Routing Protocols

During a network architecture review, an engineer explains how distance-vector routing protocols prevent routing loops on a local subnetwork. Specifically, the protocol prevents a router from advertising a learned route back out of the exact interface from which it received that update. Which mechanism is the engineer describing?

  1. Split horizonCevap
  2. B
    Time to Live (TTL) decrementing
  3. C
    Default gateway redirection
  4. D
    Command line port assignment

Cevap

Split horizon is the loop-prevention rule that prevents a router from advertising a network route back through the same interface from which it was learned.
Split horizon directly prevents distance-vector routing loops by prohibiting a router from sending routing information about a network back out of the interface through which the router originally learned about that network.

Adım Adım Çözüm

1
Analyze the operational constraint described in the scenario.
The scenario highlights a rule prohibiting route propagation back toward the source interface.
Distance-vector routing protocols rely on neighbor-reported distance updates and require loop-mitigation techniques.
2
Differentiate between packet-level and protocol-level loop mitigation.
IP header TTL operates on individual packets, whereas split horizon governs route advertisement announcements between routers.
Preventing invalid route announcements prevents routing loops from forming in the routing table initially.

Anahtar Kavram

Distance-Vector Loop Prevention Mechanics (Split Horizon)
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Konular

Routing Concepts and Dynamic Routing Protocols

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