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Hosts in VLAN 10 need to communicate with hosts in VLAN 20. What is required for that communication to work?

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Hosts in VLAN 10 need to communicate with hosts in VLAN 20. What is required for that communication to work?

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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

A DHCP server

DHCP provides addressing, not routing between VLANs.

B

Distractor review

A DNS server

DNS resolves names, not inter-VLAN paths.

C

Best answer

A Layer 3 routing function

Correct. Layer 3 routing is required.

D

Distractor review

A second access switch

Another Layer 2 switch alone does not route between VLANs.

Common exam trap

Common exam trap: answer the scenario, not the keyword

{"title":"The 'Extra Switch' Trap","description":"Adding more switches only expands your existing broadcast domains; it doesn't bridge them. You need a Layer 3 device."}

Technical deep dive

How to think about this question

Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • VLANs create separate broadcast domains that isolate traffic at Layer 2, preventing direct communication between different VLANs without routing.
  • Inter-VLAN communication requires a Layer 3 routing function to forward packets between VLANs, either via a router or a multilayer switch.
  • Switched Virtual Interfaces (SVIs) on Cisco multilayer switches provide logical Layer 3 interfaces for each VLAN to enable routing.
  • DHCP servers assign IP addresses but do not route traffic between VLANs, so they cannot enable inter-VLAN communication.
  • DNS servers resolve hostnames to IP addresses but do not affect VLAN traffic forwarding or routing.
  • Adding additional Layer 2 switches does not enable communication between VLANs because Layer 2 devices do not perform routing.
  • Inter-VLAN routing can be implemented using router-on-a-stick or multilayer switch configurations in Cisco networks.
  • Understanding the separation of broadcast domains by VLANs helps avoid the common mistake of assuming Layer 2 connectivity suffices for inter-VLAN communication.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Related practice questions

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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 router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?

Question 2

A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?

Question 3

What is the OSPF metric called?

Question 4

A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?

Question 5

A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?

Question 6

A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?

FAQ

Questions learners often ask

What does this 200-301 question test?

VLANs create separate broadcast domains that isolate traffic at Layer 2, preventing direct communication between different VLANs without routing.

What is the correct answer to this question?

The correct answer is: A Layer 3 routing function — Traffic between VLANs must be routed. A router or multilayer switch provides the Layer 3 function needed for inter-VLAN communication.

What should I do if I get this 200-301 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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