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200-901 A company has multiple subnets Practice Question
A company has multiple subnets. A device in subnet 192.168.1.0/24 needs to communicate with a device in subnet 192.168.2.0/24. What is required for this communication?
⚠ Common exam trap
Cisco often tests the misconception that a VLAN alone enables communication between subnets, but VLANs only isolate traffic at Layer 2; a Layer 3 device is always needed to route between different subnets.
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
✓
A router or Layer 3 switch
Devices in different subnets (192.168.1.0/24 and 192.168.2.0/24) are on separate Layer 3 networks. To forward packets between these subnets, a router or Layer 3 switch is required to perform IP routing, using the destination IP address to determine the next hop. Without a Layer 3 device, the frames cannot leave the local broadcast domain.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A DNS server
Why it's wrong here
DNS resolves names to IP addresses but does not provide routing.
- ✗
A VLAN
Why it's wrong here
VLANs segment a network at Layer 2 but do not route between subnets.
- ✗
A bridge
Why it's wrong here
Bridges operate at Layer 2 and only connect the same subnet.
- ✓
A router or Layer 3 switch
Why this is correct
A router or Layer 3 switch can forward packets between different subnets.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.