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Amarjit Singh
BGP Interview Questions - Interview Questions for BGP
After IGP interview questions, I am posting BGP interview questions for CCNA and CCNP engineers. These questions are very basic and easy but during interview time no one knows how these will be asked by interviewer. So a good practice is to read it as much as we can so that we could provide the best answer to interviewer. Next post will cover about the basic questions of ip access-lists and prefix list. Read the questions below and in case any problem feel free to contact me.1. BGP is IGP or EGP? 2. BGP is link state or distance vector protocol? 3. BGP uses which port? 4. When to use BGP? 5. Can I use BGP instead of any IGP? 6. Can I run two BGP process on single router? 7. What is Autonomous System? 8. Types of BGP routing table? 9. What is the BGP path selection criteria? 10. Define various BGP path attributes. 11. Why weight doesnt fall under path attribute category? 12. What is confederation? 13. What is route reflector and why it is required? 14. What is no-synchronization rule? 15. Default BGP timers. 16. When does BGP use 0.0.0.0 router id? 17. Does route reflector come in actual path during traffic forwarding? 18. What is Site of origin aka SOO? 19. What is the cost of external and internal BGP routes? 20. Can we use local preference outside the autonomous system? 21. Does it require that BGP router-id should reachable in cloud? 22. What is recursive lookup in BGP and how it works? 23. What is the meaning of update source loopback? 24. If a static route is advertised in BGP without using update source what will be the next hop address in update? 25. Define various types of communities and why they are used? 26. If BGP neighbor state is showing idle what does it mean? 27. In Multihoming scenario if primary link gets fail, after how long traffic will be shifted to secondary link. 28. I am having two routes for remote destination but only single route is installing in routing table, whats the reason for this? 29. How many links can be assigned for load balancing or sharing? 30. In eBGP I am establishing my neighbourship with loopback address but its not coming up. Please specify different reasons for not coming up. 31. Can we redistribute BGP in IGP? Please explain your answers. 32. What is cluster id? 33. I am receiving updates from eBGP peer, will the next hop change or not? 34. I am receiving updates from iBGP peer, will the next hop change or not? 35. A router is receiving same route from two different eBGP peers. The AS information contains in peer 1 is {65500, 65550, 65555} and in peer 2 is {65501, 65501}. But I want to make peer 1 preferred. 36. What is the difference between next-hop-self and update source loopback? 37. Define loop prevention mechanism in BGP. 38. What will happen if route reflector is not getting proper updates? 39. What will happen if route reflectors does not synchronize? 40. What is the advantage of using BGP AS Prepend? 41. Can we use BGP as backdoor link for customers instead of OSPF? If yes, please let us know what could the issues BGP create? 42. What is BGP PIC? 43. Use BGP as Link Protection in case of Dual PoP? 44. How to achieve Inter-AS Communication-MP-eBGP? 45. What can happen if Route Reflector(RR) is not getting proper route updates? 46. What is route reflector synchronization? 47. How to use BGP as PE-CE backdoor link? 48. What is Hierarchical FIB - BGP-PIC? 49. BGP Graceful Restart, NSR and NSF 50. BGP Redistribution Vs MPLS, which one you will select? 51. Best practices to define BGP Communities as per RFC 1998. 52. What is BGP RFC 3107 or What is BGP Label Update in IPv4? Posted by Shivlu Jain
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