350-601 Storage Network Practice Question
Which Fibre Channel frame field is used to identify the upper-layer protocol being carried?
⚠ Common exam trap
Cisco often tests the R_CTL field by confusing candidates with the D_ID field, as many assume the destination address determines the protocol, but R_CTL is the explicit field for upper-layer protocol identification.
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
✓
R_CTL
The R_CTL (Routing Control) field in the Fibre Channel frame header is used to identify the upper-layer protocol being carried, such as SCSI-FCP, IP, or VI. It contains the routing bits and information category that specify the frame type and protocol context, enabling the receiver to interpret the payload correctly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Source FC ID
Why it's wrong here
Source FC ID identifies the source port.
- ✗
D_ID
Why it's wrong here
Destination ID identifies the destination port.
- ✗
CS_CTL
Why it's wrong here
Class-specific control is for class of service.
- ✓
R_CTL
Why this is correct
Routing Control field specifies the frame category and protocol.
Go deeper
Related to this question
About these practice questions
This 350-601 question is part of Courseiva's 984-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.