Core Networking Interview Questions

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Here’s a list of essential fundamental core networking interview questions. Great for improving your skills and getting ready for interviews, this collection is a helpful resource for mastering networking basics.

  1. Define Network?
  2. What are the different types of a network? Explain each briefly.
  3. What is a gateway?
  4. What is a Protocol?
  5. Why subnetting is required?
  6. What is Routing?
  7. Explain difference between Router & Switch?
  8. What are the types of MAC Addresses?
  9. What is the difference between Private IP and Public IP?
  10. What is the range of private & public ip address?
  11. What is the difference between broadcast domain and collision domain?
  12. What is ping? for what purpose we use ping?
  13. Define Unicasting, Multicasting and Broadcasting and Any casting?
  14. What are the differences between static ip addressing and dynamic ip addressing?
  15. What is the difference between the Internet, Intranet, and Extranet?
  16. What is AS (Autonomous System)?
  17. What is AD (Administrative Distance)?
  18. Differentiate full-duplex from half-duplex?
  19. List the layers of OSI?
  20. Routers work at which OSI layer?
  21. Switches work at which OSI layer?
  22. What is the difference between TCP and UDP?
  23. In which layer term “Frames” is used?
  24. In which layer term “Packets” is used?
  25. In which layer term “Segments” is used?
  26. What is CRC?
  27. What is the way to establish a TCP connection?
  28. What is the difference between RIPV1 & RIPV2?
  29. What is the administrative distance of RIP?
  30. What is Route Poisoning & Split Horizon in RIP?
  31. How do we configure RIP?
  32. What is EIGRP?
  33. Why EIGRP is called hybrid protocol?
  34. What are the different tables in EIGRP?
  35. What are the different packets in EIGRP?
  36. What is meant by active and passive states in EIGRP?
  37. What is the different K-values used in EIGRP?
  38. What is successor?
  39. What are different route types in EIGRP?
  40. How do we configure EIGRP?
  41. What is OSPF?
  42. What are area types?
  43. What Is Backbone Area?
  44. Explain Area Border Router(ABR)?
  45. What are LSA types?
  46. What Is the Default Hello Interval?
  47. What are different neighbor states in OSPF?
  48. Briefly explain functioning and working of different OSPF?
  49. What are the different OSPF network types?
  50. Name tables which OSPF maintain?
  51. How OSPF DR & BDR Is Elected?
  52. What Parameters Must Match for Two Routers to Become Neighbors?
  53. How Do We Configure OSPF Routing Protocol?
  54. What is the layer 2 loop?
  55. What is Spanning tree protocol?
  56. How STP works?
  57. Define selection criteria of STP root bridge?
  58. How does STP maintain a loop-free network?
  59. What is the basics function of BPDU?
  60. What are the different types of BPDU?
  61. What is the STP blocking state?
  62. What is the STP Forwarding state?
  63. What is Difference between STP and RSTP?
  64. Which command enables RSTP on a switch?
  65. What is the method of selecting a root port?
  66. What are the different states of ports in STP?
  67. Explain different types of STP Timers?
  68. How do we configure STP?
  69. Which switching technology reduces the size of a broadcast domain?
  70. What are the benefits of creating VLANs?
  71. What type of traffic goes through native VLAN?
  72. What is difference between Trunk and Access mode?
  73. What is Inter-Vlan Routing?
  74. What are the different VLAN Frame tagging techniques?
  75. What is QinQ?
  76. Give the commands to create VLANs?
  77. What is VTP?
  78. What is the benefit of VTP?
  79. What are the VLAN Trunking Protocol (VTP) Modes?
  80. What is VTP Transparent Mode?
  81. What is a VTP configuration revision number?
  82. What is VTP Pruning?
  83. What is a VPN?
  84. Explain DHCP briefly?
  85. Briefly describe NAT
  86. What are firewalls?
  87. What is traceroute?
  88. What is ICMP?
  89. What are IGPs and EGPs and why are they different?
  90. What is the purpose of BGP?
  91. Name several path attributes and their function.
  92. What is the global routing table?
  93. What is the Port Number of BGP?
  94. What is the BGP path selection criteria?
  95. What is route reflector and why it is required?
  96. What is synchronization in BGP?
  97. What is Finite State Machine (FSM)?
  98. what is difference between access list and prefix list?
  99. What is MPLS?