Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Which of the following is a characteristic of a Layer 2 broadcast domain?
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
Devices can communicate using MAC addresses alone.
Devices within the same broadcast domain can communicate using MAC addresses, but this is not a defining characteristic of a broadcast domain; it is true for any Layer 2 network segment.
B
Distractor review
All devices must be on the same IP subnet.
While devices in the same broadcast domain are often on the same subnet, it is not a Layer 2 requirement. VLANs logically separate broadcast domains, and IP subnetting is typically aligned.
C
Best answer
Broadcast frames are forwarded to all ports within the domain.
The key characteristic of a broadcast domain is that a broadcast frame sent by any device is received by all other devices in that domain. Switches forward broadcasts to all ports in the same VLAN.
D
Distractor review
Routers are required to communicate between devices in the same domain.
Routers are not needed for communication within the same broadcast domain; switches handle Layer 2 forwarding. Routers are only required to communicate between different broadcast domains (subnets).
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: Broadcast frames are forwarded to all ports within the domain. — A broadcast domain consists of devices that receive broadcast frames sent by any device within the domain. In a typical switched network, the broadcast domain is usually a VLAN or a single collision domain extended by switches. Routers separate broadcast domains.
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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