Question 845 of 984
FCIP WAN Extension: Key Factors for Jitter, Latency & Bandwidth
Which THREE factors must be considered when implementing FCIP for SAN extension over a WAN? (Choose three.)
Quick Answer
The answer is available bandwidth and potential congestion, along with jitter and packet loss, as the three critical factors for FCIP WAN extension. FCIP encapsulates Fibre Channel frames into IP packets for transport over a WAN, but unlike dedicated Fibre Channel links, IP networks introduce variable delay and loss that directly trigger Fibre Channel timeouts and retransmissions, degrading storage performance. On the Cisco DCCOR 350-601 exam, this concept tests your understanding that FCIP design must explicitly account for WAN characteristics—jitter and loss are not inherent to Fibre Channel and are common traps where candidates mistakenly focus only on bandwidth. A key memory tip is to remember the acronym “JLB” for Jitter, Loss, and Bandwidth, as these three form the core of any FCIP WAN extension assessment.
⚠ Common exam trap
Cisco often tests the distinction between Fibre Channel fabric parameters (like VSANs and B2B credits) and WAN-specific factors (jitter, loss, RTT, bandwidth) that directly impact FCIP tunnel performance, leading candidates to select local SAN parameters instead of WAN characteristics.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Jitter and packet loss characteristics.
FCIP (Fibre Channel over IP) tunnels encapsulate Fibre Channel frames over IP networks. Jitter and packet loss directly cause Fibre Channel timeouts and retransmissions, severely impacting storage performance. Unlike Fibre Channel over dedicated links, WAN characteristics like jitter and loss must be explicitly accounted for in FCIP design.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VSAN configuration on the remote MDS switch.
Why it's wrong here
VSANs are local fabric constructs, not WAN-specific.
- ✓
Jitter and packet loss characteristics.
Why this is correct
Jitter and loss impact TCP performance and retransmissions.
- ✗
Buffer-to-buffer credit count on the FCIP tunnel.
Why it's wrong here
Buffer credits are not used in FCIP; they are for FC links.
- ✓
Round-trip time (RTT) latency of the WAN link.
Why this is correct
Latency affects TCP window sizing and performance.
- ✓
Available bandwidth and potential congestion.
Why this is correct
Bandwidth limits throughput; congestion causes packet loss.
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Same concept, more angles
1 more way this is tested on 350-601
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium- ✓ A.Configure a large TCP window size.
- B.Enable compression on the FCIP tunnel.
- C.Increase the buffer-to-buffer credits.
- D.Reduce the TCP MSS to 512 bytes.
Why A: 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.
Last reviewed: Jun 24, 2026
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