Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A network technician is analyzing a small office network topology. An 8-port switch has 7 workstations directly connected. The remaining switch port is connected to a 4-port hub, which has 4 workstations attached. All devices are configured on the same VLAN and IP subnet. How many collision domains and broadcast domains are present in this network?
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
Best answer
8 collision domains, 1 broadcast domain
Correct. Each switch port creates its own collision domain (8 total). The hub does not add separate collision domains; it connects all its ports into the collision domain of the switch port it is attached to. All devices are on the same VLAN, so there is one broadcast domain.
B
Distractor review
11 collision domains, 1 broadcast domain
Incorrect. This answer incorrectly counts each workstation on the hub as a separate collision domain. Hubs do not segment collision domains; they operate at Layer 1 and forward all signals, so all hub-attached devices belong to the same collision domain as the switch port.
C
Distractor review
12 collision domains, 5 broadcast domains
Incorrect. There are not 12 collision domains; the total is 8 (one per switch port). Also, a broadcast domain is not determined by the number of devices. All devices share the same broadcast domain because they are on the same VLAN and no router is involved.
D
Distractor review
8 collision domains, 5 broadcast domains
Incorrect. While 8 collision domains is correct, 5 broadcast domains is wrong. Broadcast domains are separated by Layer 3 devices (routers), or by VLANs if trunked. Since all devices are on the same VLAN and subnet without a router, there is only one broadcast domain.
Common exam trap
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Technical deep dive
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
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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 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?
Question 2
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 3
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 4
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 5
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 6
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?
FAQ
Questions learners often ask
What does this N10-009 question test?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: 8 collision domains, 1 broadcast domain — A switch creates a separate collision domain on each of its ports, regardless of what is connected to that port. The hub, being a Layer 1 device, extends the collision domain from the switch port it is connected to, so all devices on the hub share that same collision domain. Therefore, with 8 switch ports, there are 8 collision domains. A broadcast domain is defined by the Layer 2 network boundary. Since all devices are on the same VLAN and subnet, and there is no router implementing segmentation, only a single broadcast domain exists.
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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