Prime 100 OSPF Interview Questions

ANSWERS @ – https://ipwithease.com/product/ospf/

Get geared up with one of the best set of questions requested for OSPF :

1. Why are loopbacks marketed as /32 host routes in OSPF ?
2. How do I alter the reference bandwidth in OSPF ?
3. How does OSPF calculate its metric or value ?
4. What algorithm is utilized by OSPF if equal value routes exist ?
5. Are OSPF routing protocol exchanges authenticated ?
6. What’s the link-state retransmit interval, and what’s the command to set it ?
7. Is it true that solely the static possibility of the digital hyperlink in OSPF permits discontiguous networks, whatever the masks propagation properties ?
8. Does the Cisco OSPF assist IP TOS-based routing?
9. Does the offset-list subcommand work for OSPF ?
10. Can an OSPF default be originated into the system based mostly on exterior info on a router that doesn’t itself have a default ?
11. Can I exploit the distribute-list in/out command with OSPF to filter routes ?
12. How can I give choice to OSPF inter-area routes over intra-area routes ?
13. When routes are redistributed between OSPF processes, are all shortest path first algorithm  metrics preserved, or is the default metric worth used ?
14. Which address-wild-mask pair ought to I exploit for assigning an unnumbered interface to an space ?
15. Can we’ve one numbered and different aspect unnumbered in OSPF ?
16. What’s the motive for receiving “unknown routing protocol” error message after I configure “Router OSPF One” ?
17. What do the states DR, BDR, and DROTHER imply in present ip ospf interface command output ?
18. Why do I not see OSPF neighbors as FULL/DR or FULL/BDR on my serial hyperlink ?
19. Do I want any particular instructions to run OSPF over asynchronous hyperlinks?
20. Which Cisco IOS Software program launch started assist for per-interface authentication kind in OSPF?
21. Can I management the P-bit when importing exterior routes right into a not-so-stubby space (NSSA) ?
22. Why does OSPF present instructions reply so sluggish ?
23. What does the clear ip ospf redistribution command do ?
24. How usually does OSPF ship out link-state commercials (LSAs) ?
25. How do I cease particular person interfaces from creating adjacencies in an OSPF community ?
26. When I’ve two kind 5 link-state commercials (LSAs) for a similar exterior community within the OSPF database, which path ought to be put in within the IP routing desk ?
27. Why is it that my Cisco 800 router doesn’t run OSPF ?
28. Ought to I exploit the identical course of quantity whereas configuring OSPF on a number of routers throughout the identical community?
29. I’ve a router that runs Cisco Specific Forwarding (CEF) and OSPF, who does load-balancing when there are a number of hyperlinks to a vacation spot?
30. How does OSPF use two Multilink paths to switch packets ?
31. How are you going to detect the topological adjustments quickly?
32. Does the 3825 Collection Router assist the OSPF Stub characteristic?
33. What does the error message %OSPF-4-FLOOD_WAR: Course of process-id re-originates LSA ID ip tackle type-2 adv-rtr ip tackle in space space id means?
34. Can we’ve OSPF run over a GRE tunnel ?
35. Is there a technique to manipulate and like the Sort 3 LSAs to originate from two completely different areas despatched to the non-backbone space ?
36. What’s the function of the “variable IP-OSPF-Transmit-Delay” ?
37. Is there a drop/flap of an OSPF neighborship when altering an OSPF space kind from “nssa no-summary” to “nssa” ?
38. Within the %OSPF-5-ADJCHG: Course of ID, Nbr [ip address] on Port-channel31 from FULL to EXSTART, SeqNumberMismatch error message, what does SeqNumberMismatch signify ?
39. What’s the most variety of OSPF processes (VRF conscious) on 7600/6500 platforms?
40. How does ISPF impression or enhance the OSPF community?
41. Is there a technique to evaluate Cisco NX-OS/IOS OSPF instructions ?
42. Is there any characteristic of OSPF protocol for fast convergence and a sluggish re-convergence of routes ?
43. What are completely different neighbor states in OSPF ?
44. Give the command for outlining the price of a default route propagated into an space?
45. What’s position of topology and routing desk in OSPF ?
46. Once I concern the “present ip ospf neighbor” command, why do I solely see FULL/DR and FULL/BDR, with all different neighbors exhibiting 2-WAY/DROTHER ?
47. Identify forms of LSA ?
48. Why do I obtain the “can not allocate router id” error message after I configure Router OSPF One ?
49. What are the completely different OSPF community varieties and provides an instance for every ?
50. What command would you utilize to create a very stubby space?
51. Identify tables which OSPF preserve ?
52. Which multicast addresses utilized in OSPF ?
53. On which router is the realm default value outlined ?
54. With which community kind will OSPF set up router adjacencies however not carry out the DR/BDR election course of?
55. What are the Route varieties in OSPF ?
56. What’s the administrative distance of OSPF ?
57. What’s the worth of hey and Useless timers in OSPF ?
58. What are the Space Varieties ?
59. What are the completely different States in OSPF?
60. What should match earlier than an adjacency ?
61. Methods to carry out Inter-Space Summarization in OSPF ?
62. Methods to carry out Exterior Summarization ?
63. What are Digital-Hyperlinks ?
64. What’s want of digital Hyperlink ?
65. What’s a Sham-Hyperlink ?
66. Clarify the next syntax and what it would obtain: space 1 stub no-summary ?
67. What may very well be motive for OSPF neighbors being “caught in 2 approach” ?
68. What may very well be motive for OSPF neighbors being “caught in Extart” ?
69. What may very well be motive for OSPF neighbors being “caught in init” ?
70. What may very well be motive for OSPF neighbors being “caught in loading” ?
71. What’s the algorithm utilized by OSPF ?
72. What’s OSPF Router ID and the way is it elected ?
73. What’s the DR/BDR in OSPF? How these are elected and in what situation ?
74. What’s going to occur if we make precedence of a OSPF router as “zero” ?
75. Does DR/BDR election occur in OSPF Level to Level Community  ?
76. What’s Spine space ?
77. What’s stub space, Completely Stubby Space, Not So Stubby space (NSSA)?
78. Can space 1 and space 2 alternate or promote networks if they aren’t related to space 0 (Spine space) ? What we have to do make it occur ?
79. Clarify the idea of Space Border Router (ABR) ?
80. Clarify idea of Autonomous System Border Router (ASBR) ?
81. What’s O E1, O E2 letters in OSPF? Which is default exterior kind 1 or exterior kind 2 ?
82. If any of the OSPF space just isn’t stabilized, does it impression one other space ?
83. What’s OSPF routes choice to ensure that the next record – Exterior Sort 2 (E2) , Intra-Space (O), Exterior Sort 1 (E1), NSSA Sort 1 (N1), Inter-Space (O IA), NSSA Sort 2 (N2) ?
84. What’s advantage of dividing community into areas ?
85. What parameters should match for two routers to develop into neighbors ?
86. What are varied OSPF states?
87. Does OSPF kind adjacencies with neighbors that aren’t on the identical subnet ?
88. Clarify OSPF LSA, LSU and LSR ?
89. What’s distinction between OSPF and EIGRP ?
90. What’s distinction between OSPF and IS-IS ?
91. Present the three desk varieties in OSPF ?
92. Is OSPF a classless or classfull protocol?
93. Which protocol does OSPF makes use of on the transport layer for communication ?
94. Can we use OSPF with out spine space?
95. Which RFC describes OSPF model 2 ?
96. By default OSPF will load steadiness over what number of equal value paths ?
97. OSPF is represented as protocol quantity _____ within the IP packet
98. That are the two principal capabilities of the DR ?
99. Which 2 parameters help in DR election?
100. Methods to promote a default-route if it doesn’t exist within the RIB?

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