Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Single-mode fiber with 1000BASE-LX transceivers
Single-mode fiber can reach 400m, but it is overkill and more expensive than multimode for this distance.
B
Best answer
Multimode fiber with 1000BASE-SX transceivers
1000BASE-SX over multimode fiber supports distances up to 550 meters, making it suitable and cost-effective for 400m.
C
Distractor review
Multimode fiber with 10GBASE-SR transceivers
10GBASE-SR can also work over multimode fiber but typically supports shorter distances (300m for OM3) and is more expensive than 1Gbps options if 1Gbps is sufficient.
D
Distractor review
Single-mode fiber with 1000BASE-EX transceivers
1000BASE-EX is designed for longer distances (up to 40km), which is excessive and costly for 400m.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 2
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 3
A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?
Question 4
A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?
Question 5
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
Question 6
A network administrator needs to generate a report of all MAC addresses learned on each switch port to assist with inventory management. Which command-line utility can be used to view the MAC address table on a switch?
FAQ
Questions learners often ask
What does this N10-009 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 with 1000BASE-SX transceivers — For distances up to 400 meters, multimode fiber (typically OM3/OM4) with an SFP transceiver such as 1000BASE-SX (850nm wavelength) is cost-effective and supports distances up to 550 meters. Single-mode fiber (1000BASE-LX) can go much longer but is more expensive and unnecessary for this distance.
What should I do if I get this N10-009 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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