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SK0-003 · Question #288

A server is connected to a gigabit Ethernet switch and has negotiated 1Gbps / Full Duplex. When transferring large files to and from other servers on the segment via FTP slow performance is noticed. A

The correct answer is C. Increase the TCP window size.. To improve slow FTP performance on a high-speed network when transferring large files, increasing the TCP window size is an effective solution.

Server administration

Question

A server is connected to a gigabit Ethernet switch and has negotiated 1Gbps / Full Duplex. When transferring large files to and from other servers on the segment via FTP slow performance is noticed. All network cabling, network hardware and server hardware were verified to be working correctly. Which of the following could be done to improve performance?

Options

  • ADecrease the TCP window size.
  • BIncrease the UDP window size.
  • CIncrease the TCP window size.
  • DDecrease the UDP window size.

How the community answered

(45 responses)
  • A
    16% (7)
  • B
    9% (4)
  • C
    71% (32)
  • D
    4% (2)

Why each option

To improve slow FTP performance on a high-speed network when transferring large files, increasing the TCP window size is an effective solution.

ADecrease the TCP window size.

Decreasing the TCP window size would limit the amount of data in flight, requiring more frequent acknowledgments and thus reducing throughput, which would worsen performance.

BIncrease the UDP window size.

UDP is a connectionless protocol that does not use windowing for flow control in the same way TCP does. FTP exclusively uses TCP, making adjustments to UDP window size irrelevant.

CIncrease the TCP window size.Correct

The TCP window size determines how much data can be sent without requiring an acknowledgment from the receiver. For large file transfers over high-bandwidth, full-duplex links, a larger TCP window size allows more data to be 'in flight' at any given time, which is crucial for maximizing throughput and reducing the impact of network latency.

DDecrease the UDP window size.

UDP is a connectionless protocol that does not use windowing for flow control in the same way TCP does. FTP exclusively uses TCP, making adjustments to UDP window size irrelevant.

Concept tested: TCP window size optimization for throughput

Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/network-subsystem/net-sub-tuning-tcp

Topics

#TCP window size#network performance#FTP#network optimization

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