300-320 · Question #649
Which properties apply to both to OSPF and IS-IS? (Select two.)
The correct answer is A. Link-state routing protocol B. Supports VLSM. Option A is correct: both OSPF and IS-IS are link-state routing protocols - each router builds a complete map of the topology using LSAs (OSPF) or LSPs (IS-IS) and runs the Dijkstra SPF algorithm to compute shortest paths. Option B is correct: both protocols support VLSM…
Question
Which properties apply to both to OSPF and IS-IS? (Select two.)
Options
- ALink-state routing protocol
- BSupports VLSM
- CUsually deployed in enterprise environment
- DUses DUAL algorithm
- EUses levels to establish routing hierarchy
How the community answered
(32 responses)- A88% (28)
- C6% (2)
- D3% (1)
- E3% (1)
Explanation
Option A is correct: both OSPF and IS-IS are link-state routing protocols - each router builds a complete map of the topology using LSAs (OSPF) or LSPs (IS-IS) and runs the Dijkstra SPF algorithm to compute shortest paths. Option B is correct: both protocols support VLSM (Variable Length Subnet Masking) and carry subnet mask information in their advertisements, enabling classless routing. Option C is incorrect because IS-IS is predominantly deployed in service provider networks, not enterprise environments. Option D is incorrect - DUAL (Diffusing Update Algorithm) is exclusive to EIGRP, not OSPF or IS-IS. Option E is incorrect because IS-IS uses levels (Level 1 and Level 2) for hierarchy, but OSPF uses areas - not levels - for its routing hierarchy.
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