Load Balancing interview questions

54 real Load Balancing questions from the Networking bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is Load balancer?

Junior
  1. A.the single address clients connect to that the load balancer fronts
  2. B.a device that distributes incoming traffic across multiple backend servers
  3. C.decrypting HTTPS at the load balancer so backends receive plaintext
  4. D.a method that sends each new request to the next server in rotation
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3. Which statement is correct?

Junior
  1. A.Load balancer — the group of servers a load balancer distributes requests across
  2. B.Load balancer — distributing traffic based on application data such as URL or HTTP headers
  3. C.Load balancer — a server that fronts backends, forwarding client requests and returning responses
  4. D.Load balancer — a device that distributes incoming traffic across multiple backend servers
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4. What is Round-robin?

Junior
  1. A.the group of servers a load balancer distributes requests across
  2. B.mapping connections to backends so adding or removing a node minimizes remapping
  3. C.a method that sends each new request to the next server in rotation
  4. D.directing users to the best data center using DNS or anycast
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6. Which statement is correct?

Junior
  1. A.Round-robin — advertising one IP from many sites so routing sends users to the nearest node
  2. B.Round-robin — a method that sends each new request to the next server in rotation
  3. C.Round-robin — the group of servers a load balancer distributes requests across
  4. D.Round-robin — distributing traffic based on application data such as URL or HTTP headers
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7. What is Health check?

Junior
  1. A.advertising one IP from many sites so routing sends users to the nearest node
  2. B.a periodic probe that removes unhealthy backends from rotation
  3. C.distributing traffic based on IP and TCP/UDP port without inspecting payload
  4. D.a device that distributes incoming traffic across multiple backend servers
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9. Which statement is correct?

Junior
  1. A.Health check — the single address clients connect to that the load balancer fronts
  2. B.Health check — automatically shifting traffic to a standby resource when the primary fails
  3. C.Health check — a method that sends each new request to the next server in rotation
  4. D.Health check — a periodic probe that removes unhealthy backends from rotation
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10. What is Virtual IP (VIP)?

Junior
  1. A.routing a client's requests to the same backend for the session's duration
  2. B.advertising one IP from many sites so routing sends users to the nearest node
  3. C.the single address clients connect to that the load balancer fronts
  4. D.the group of servers a load balancer distributes requests across
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12. Which statement is correct?

Junior
  1. A.Virtual IP (VIP) — mapping connections to backends so adding or removing a node minimizes remapping
  2. B.Virtual IP (VIP) — the single address clients connect to that the load balancer fronts
  3. C.Virtual IP (VIP) — a server that fronts backends, forwarding client requests and returning responses
  4. D.Virtual IP (VIP) — distributing traffic based on IP and TCP/UDP port without inspecting payload
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13. What is Layer 4 load balancing?

Mid
  1. A.distributing traffic based on application data such as URL or HTTP headers
  2. B.decrypting HTTPS at the load balancer so backends receive plaintext
  3. C.distributing traffic based on IP and TCP/UDP port without inspecting payload
  4. D.a periodic probe that removes unhealthy backends from rotation
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14. Which term means: "distributing traffic based on IP and TCP/UDP port without inspecting payload"?

Mid
  1. A.Layer 4 load balancing
  2. B.Least connections
  3. C.Session persistence (sticky sessions)
  4. D.Global server load balancing (GSLB)
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15. Which statement is correct?

Mid
  1. A.Layer 4 load balancing — distributing traffic based on IP and TCP/UDP port without inspecting payload
  2. B.Layer 4 load balancing — a periodic probe that removes unhealthy backends from rotation
  3. C.Layer 4 load balancing — round-robin biased so more capable servers receive proportionally more traffic
  4. D.Layer 4 load balancing — automatically shifting traffic to a standby resource when the primary fails
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16. What is Layer 7 load balancing?

Mid
  1. A.distributing traffic based on application data such as URL or HTTP headers
  2. B.automatically shifting traffic to a standby resource when the primary fails
  3. C.distributing traffic based on IP and TCP/UDP port without inspecting payload
  4. D.a periodic probe that removes unhealthy backends from rotation
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18. Which statement is correct?

Mid
  1. A.Layer 7 load balancing — distributing traffic based on application data such as URL or HTTP headers
  2. B.Layer 7 load balancing — directing users to the best data center using DNS or anycast
  3. C.Layer 7 load balancing — advertising one IP from many sites so routing sends users to the nearest node
  4. D.Layer 7 load balancing — letting existing connections finish before removing a backend from service
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19. What is Session persistence (sticky sessions)?

Mid
  1. A.advertising one IP from many sites so routing sends users to the nearest node
  2. B.letting existing connections finish before removing a backend from service
  3. C.routing a client's requests to the same backend for the session's duration
  4. D.a device that distributes incoming traffic across multiple backend servers
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21. Which statement is correct?

Mid
  1. A.Session persistence (sticky sessions) — routing a client's requests to the same backend for the session's duration
  2. B.Session persistence (sticky sessions) — round-robin biased so more capable servers receive proportionally more traffic
  3. C.Session persistence (sticky sessions) — a periodic probe that removes unhealthy backends from rotation
  4. D.Session persistence (sticky sessions) — letting existing connections finish before removing a backend from service
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22. What is Least connections?

Mid
  1. A.advertising one IP from many sites so routing sends users to the nearest node
  2. B.sending new requests to the backend with the fewest active connections
  3. C.a periodic probe that removes unhealthy backends from rotation
  4. D.a method that sends each new request to the next server in rotation
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24. Which statement is correct?

Mid
  1. A.Least connections — automatically shifting traffic to a standby resource when the primary fails
  2. B.Least connections — sending new requests to the backend with the fewest active connections
  3. C.Least connections — distributing traffic based on IP and TCP/UDP port without inspecting payload
  4. D.Least connections — a device that distributes incoming traffic across multiple backend servers
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25. What is SSL/TLS termination?

Senior
  1. A.decrypting HTTPS at the load balancer so backends receive plaintext
  2. B.distributing traffic based on IP and TCP/UDP port without inspecting payload
  3. C.mapping connections to backends so adding or removing a node minimizes remapping
  4. D.automatically shifting traffic to a standby resource when the primary fails
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27. Which statement is correct?

Senior
  1. A.SSL/TLS termination — a mode where backends reply directly to clients, bypassing the load balancer on egress
  2. B.SSL/TLS termination — decrypting HTTPS at the load balancer so backends receive plaintext
  3. C.SSL/TLS termination — the single address clients connect to that the load balancer fronts
  4. D.SSL/TLS termination — the group of servers a load balancer distributes requests across
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28. What is Global server load balancing (GSLB)?

Senior
  1. A.a mode where backends reply directly to clients, bypassing the load balancer on egress
  2. B.a device that distributes incoming traffic across multiple backend servers
  3. C.directing users to the best data center using DNS or anycast
  4. D.the group of servers a load balancer distributes requests across
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30. Which statement is correct?

Senior
  1. A.Global server load balancing (GSLB) — directing users to the best data center using DNS or anycast
  2. B.Global server load balancing (GSLB) — decrypting HTTPS at the load balancer so backends receive plaintext
  3. C.Global server load balancing (GSLB) — the single address clients connect to that the load balancer fronts
  4. D.Global server load balancing (GSLB) — sending new requests to the backend with the fewest active connections
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