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Zorluk: OrtaRouting Concepts and Dynamic Routing Protocols

A network engineer is evaluating dynamic routing protocols for an enterprise network expansion. The requirement is to implement a protocol that maintains a detailed topology map of the network and converges quickly upon topology changes. Which of the following statements accurately describe operational characteristics of Link-State dynamic routing protocols? (Select TWO)

  1. Routers build an independent, complete view of the network topology stored in a Link-State Database (LSDB).Cevap
  2. Routers transmit triggered Link-State Advertisements (LSAs) immediately upon detecting link updates rather than periodically sending full routing tables.Cevap
  3. C
    Routers periodically broadcast their entire routing table to directly connected neighbors using hop count as the primary metric.
  4. D
    Routers encapsulate link metric calculations into OSI Layer 2 frames to bypass Layer 3 routing logic entirely.

Cevap

Link-State routing protocols are characterized by each router maintaining a complete topology map in its Link-State Database (LSDB) and using event-driven Link-State Advertisements (LSAs) to notify neighbors of topology changes.
Link-state protocols function by having every router build an identical topology database (LSDB) for its area using the Shortest Path First (SPF) algorithm. In addition, link-state protocols do not send their full routing tables on a periodic timer; instead, they flood incremental Link-State Advertisements (LSAs) immediately when a link status change occurs.

Adım Adım Çözüm

1
Identify the fundamental mechanics of Link-State routing protocols.
Link-state protocols (such as OSPF and IS-IS) rely on neighbor discovery, LSA flooding, and the Dijkstra Shortest Path First (SPF) algorithm to calculate optimal paths.
Unlike distance-vector protocols that route by rumor, link-state routers possess full topology visibility.
2
Evaluate statements regarding LSDB structure and update mechanisms.
The statement regarding routers building an independent topology map in an LSDB and the statement regarding event-driven, triggered LSA updates are both true characteristics of link-state protocols.
Event-driven updates ensure fast convergence, while the LSDB provides full topology awareness.
3
Eliminate statements describing distance-vector features or Layer 2 misattributions.
The statement describing periodic routing table broadcasts based on hop count refers to distance-vector protocols (e.g., RIP), and the statement claiming routing logic operates strictly at Layer 2 confuses OSI layer roles.
Link-state protocols use cost metrics based on bandwidth (not hop count) and function within Layer 3 routing control plane processes.

Anahtar Kavram

Operational characteristics of Link-State dynamic routing protocols (LSDB, event-driven LSAs, SPF algorithm)
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Konular

Routing Concepts and Dynamic Routing Protocols

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