This 350-601 practice question tests your understanding of storage network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer is designing a SAN extension over a WAN link using FCIP. The link has high latency (50 ms RTT). Which configuration is most critical to maintain performance?
Configure a large TCP window size.
Window scaling allows more data in flight, improving throughput over high-latency links.
Enable compression on the FCIP tunnel.
Why wrong: Compression reduces bandwidth but does not address latency.
Increase the buffer-to-buffer credits.
Why wrong: Buffer credits are for FC links, not FCIP tunnels.
Reduce the TCP MSS to 512 bytes.
Why wrong: Smaller MSS increases overhead and reduces efficiency.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure a large TCP window size.
FCIP encapsulates Fibre Channel frames over TCP/IP. High latency (50 ms RTT) means the TCP sender must wait longer for acknowledgments, which can stall the connection if the TCP window is too small. A large TCP window size (e.g., using window scaling per RFC 1323) allows more data to be in flight before requiring an ACK, thereby maintaining throughput and preventing performance collapse on high-latency WAN links.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Configure a large TCP window size.
Why this is correct
Window scaling allows more data in flight, improving throughput over high-latency links.
Related concept
Read the scenario before looking for a memorised answer.
Enable compression on the FCIP tunnel.
Why it's wrong here
Compression reduces bandwidth but does not address latency.
Increase the buffer-to-buffer credits.
Why it's wrong here
Buffer credits are for FC links, not FCIP tunnels.
Reduce the TCP MSS to 512 bytes.
Why it's wrong here
Smaller MSS increases overhead and reduces efficiency.
Common exam traps
Cisco often tests the misconception that buffer-to-buffer credits (BB_credits) are the primary flow control for FCIP, when in fact TCP window sizing is the critical parameter for high-latency WAN links.
Detailed technical explanation
The TCP window size determines the maximum amount of unacknowledged data in transit. With a 50 ms RTT, the bandwidth-delay product (BDP) is high; for example, a 1 Gbps link requires a window of at least 6.25 MB to fully utilize the pipe. Cisco FCIP implementations support TCP window scaling (RFC 1323) to allow windows larger than 64 KB, and the 'tcp window-size' command under the FCIP profile can be tuned to match the BDP. Without this, the link will be severely underutilized regardless of other optimizations.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-601 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Storage Network — This question tests Storage Network — Read the scenario before looking for a memorised answer..
The correct answer is: Configure a large TCP window size. — FCIP encapsulates Fibre Channel frames over TCP/IP. High latency (50 ms RTT) means the TCP sender must wait longer for acknowledgments, which can stall the connection if the TCP window is too small. A large TCP window size (e.g., using window scaling per RFC 1323) allows more data to be in flight before requiring an ACK, thereby maintaining throughput and preventing performance collapse on high-latency WAN links.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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