OSPF Protocol Features: Triggered Updates and Area Division
Short answer
BD OSPF supports triggered updates for rapid convergence and allows area division to enhance scalability and limit LSA flooding scope.
Question
Key Takeaways
The main trap is confusing OSPF with distance-vector protocols; OSPF uses cost-based metrics (not hop count) and triggered updates (not periodic broadcasts), while actively preventing loops via SPF calculation.
This question examines key characteristics of the OSPF routing protocol, specifically its support for triggered updates and hierarchical area division. The correct options highlight how OSPF achieves fast convergence and scalability.
Common mistake: Candidates often select Option C because they confuse OSPF with RIP, which uses hop count as its metric. OSPF uses a cost metric derived from bandwidth, making C incorrect. Another mistake is thinking OSPF suffers from routing loops (Option A), whereas its link-state nature explicitly prevents them.
Expert Analysis
OSPF (Open Shortest Path First) is a link-state routing protocol defined by RFC 2328. Its design fundamentally prevents routing loops through the use of the Dijkstra SPF algorithm and a complete topology database, making Option A incorrect. Unlike distance-vector protocols that rely solely on hop count, OSPF calculates the shortest path based on interface cost (metric), which reflects bandwidth and administrative preference; therefore, Option C is also incorrect.
The key features tested here are triggered updates and area division. OSPF does not use periodic full-table broadcasts like RIP. Instead, it supports triggered updates where Link State Advertisements (LSAs) are sent immediately when a topology change is detected, ensuring rapid convergence (Option B). Additionally, to manage scalability in large networks, OSPF allows the network to be divided into multiple areas connected to a backbone area (Area 0), which reduces LSDB size and limits LSA flooding scope (Option D).
While some comments argue for single-choice answers due to exam format ambiguity, technically both B and D are core, documented features of the OSPF protocol. In multi-select contexts, both are correct. If forced to choose one 'defining' feature in a poorly constructed single-choice scenario, Area Division is often highlighted as the unique architectural capability distinguishing OSPF from basic RIP, but Triggered Updates are equally valid. Given the prompt implies potential multi-select or best-fit, and acknowledging the community debate, both B and D are factually correct attributes.
Exam Strategy
When analyzing routing protocol questions, first classify the protocol type (Link-State vs. Distance-Vector). For OSPF, immediately associate 'Cost' (bandwidth-based) instead of 'Hop Count', and 'Triggered Updates' instead of 'Periodic Updates'. Always check if 'Area Division' is mentioned, as it is a primary scalability feature of OSPF not found in basic RIP configurations.
Frequently Asked Questions
Does OSPF calculate paths based on hop count?
Why are routing loops unlikely in OSPF?
Discussion 4 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 4
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Fmoura17 👍 1 Answered BB and D are correct. ❌ A — Incorrect OSPF uses SPF (Shortest Path First) algorithm and maintains a complete topology map, so routing loops do not occur. ✅ B — Correct OSPF supports triggered updates — when a network change occurs, it immediately sends an LSA (Link State Advertisement) update rather than waiting for a periodic update like distance-vector protocols. ❌ C — Incorrect OSPF calculates the shortest path based on cost (bandwidth), not hop count. Hop count is used by protocols like RIP. ✅ D — Correct OSPF supports area division (e.g., Area 0 backbone + other areas), which reduces LSA flooding, improves scalability, and optimizes network performance.
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FerioSiqueira 👍 1 Answered BB and B Of the listed options, the features of the OSPF protocol are: a. Loops are NOT likely to ocurr B. Triggered update is supported. C. The shortest path is calculated based on link weights (not just hop count). D. Area division is supported.
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Dafuerre 👍 1 Answered DIts a single choice question, so i would mark only the D as correct
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buggybombastis10 👍 1The answer is D
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