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Question 1,219 of 1,052
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CCNA Practice Question: Which TWO statements about fiber optic cable…
This 200-301 practice question tests your understanding of 200-301 exam topics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements about fiber optic cable types and SFP transceivers are correct?
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
✓
Multimode fiber is commonly used in campus and data center environments for distances up to several hundred meters.
Single-mode fiber (SMF) has a smaller core and supports longer distances with laser-based optics, whereas multimode fiber (MMF) has a larger core and is suitable for shorter distances using LED or VCSEL sources. SFP+ transceivers are designed for 10 Gbps, while standard SFP modules support up to 1 Gbps.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Single-mode fiber uses a larger core (typically 62.5/125 µm) and supports longer distances than multimode fiber.
Why it's wrong here
Single-mode fiber has a smaller core (typically 9/125 µm), not larger. The larger core is characteristic of multimode fiber.
- ✓
Multimode fiber is commonly used in campus and data center environments for distances up to several hundred meters.
Why this is correct
Multimode fiber (e.g., OM3/OM4) is designed for shorter distances and is widely deployed in campus and data center backbones, typically up to 300-550 meters for 10 Gbps.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
SFP+ transceivers support data rates up to 1 Gbps and are backward compatible with standard SFP modules.
Why it's wrong here
SFP+ transceivers support 10 Gbps, not 1 Gbps. While SFP+ ports can often accept SFP modules, the reverse is not true—SFP ports cannot accept SFP+ modules.
- ✓
Single-mode fiber typically uses laser-based transceivers and can support distances exceeding 10 km.
Why this is correct
Single-mode fiber with laser-based optics (e.g., 1310 nm or 1550 nm) can achieve long distances, often 10 km, 40 km, or more, depending on the transceiver.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Fiber optic cables are immune to all forms of electromagnetic interference (EMI) and can be run in any environment without shielding.
Why it's wrong here
Fiber optic cables are immune to EMI, but the statement 'any environment without shielding' is misleading because physical protection (e.g., armored jacket) may still be needed in harsh environments.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Multimode fiber is commonly used in campus and data center environments for distances up to several hundred meters.Correct answer▾
Why this is correct
Multimode fiber (e.g., OM3/OM4) is designed for shorter distances and is widely deployed in campus and data center backbones, typically up to 300-550 meters for 10 Gbps.
✗Single-mode fiber uses a larger core (typically 62.5/125 µm) and supports longer distances than multimode fiber.Wrong answer — click to see why▾
Why this is wrong here
This statement incorrectly describes the core size of single-mode fiber.
✗SFP+ transceivers support data rates up to 1 Gbps and are backward compatible with standard SFP modules.Wrong answer — click to see why▾
Why this is wrong here
The data rate is incorrectly stated as 1 Gbps instead of 10 Gbps.
✗Fiber optic cables are immune to all forms of electromagnetic interference (EMI) and can be run in any environment without shielding.Wrong answer — click to see why▾
Why this is wrong here
While fiber is EMI-immune, the claim about 'any environment without shielding' is an overgeneralization.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Multimode fiber is commonly used in campus and data center environments for distances up to several hundred meters. — Single-mode fiber (SMF) has a smaller core and supports longer distances with laser-based optics, whereas multimode fiber (MMF) has a larger core and is suitable for shorter distances using LED or VCSEL sources. SFP+ transceivers are designed for 10 Gbps, while standard SFP modules support up to 1 Gbps.
What should I do if I get this 200-301 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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