What are the main functions of BGP and OSPF routing protocols?
A networking question comparing exterior and interior gateway protocols.
Why Interviewers Ask This
For network roles, understanding routing protocols is essential. This tests knowledge of how networks discover paths and exchange reachability information across different scales.
How to Answer This Question
Define BGP as an Exterior Gateway Protocol (EGP) used between autonomous systems. Define OSPF as an Interior Gateway Protocol (IGP) used within a single AS. Compare their metrics (AS path vs. cost) and algorithms (path vector vs. link-state).
Key Points to Cover
- BGP: EGP, inter-domain
- OSPF: IGP, intra-domain
- Path vector vs. Link-state
- Metrics and policies
Sample Answer
BGP (Border Gateway Protocol) is an exterior gateway protocol used to exchange routing information between different autonomous systems on the internet. It uses path vector algorithms and prioritizes policy and stability…
Common Mistakes to Avoid
- Mixing up EGP and IGP
- Confusing algorithms
- Ignoring use cases
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