- A
DNS server address
Why wrong: DNS is used to resolve domain names to IP addresses but is not required for basic IP connectivity to remote networks.
- B
Default gateway
The default gateway is the router interface that allows a host to send traffic to destinations outside its local subnet.
- C
Subnet mask
The subnet mask defines which part of the IP address is the network portion and which is the host portion, enabling the host to determine if a destination is local or remote.
- D
MAC address
Why wrong: A MAC address is a Layer 2 hardware address used for local delivery, but it is not a configurable IPv4 host parameter in the same sense; hosts automatically have a MAC address from the NIC.
- E
Host name
Why wrong: A host name is a label for the device but is not required for IPv4 communication.
Quick Answer
The answer is the subnet mask and the default gateway. These two essential IPv4 host parameters work together to enable communication with remote networks: the subnet mask allows the host to determine whether a destination IP address is local or remote by performing a logical AND with its own IP address, while the default gateway provides the next-hop router address for any traffic destined outside the local subnet. On the CCNA 200-301 v2 exam, this concept frequently appears in configuration and troubleshooting scenarios, often testing your ability to distinguish between mandatory IP-level parameters and optional services like DNS. A common trap is assuming the DNS server address is required for basic connectivity, but it only handles name resolution, not routing. Remember the memory tip: “Mask to know, gateway to go”—the subnet mask tells you if the destination is local, and the default gateway tells you where to send it if it is not.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are essential IPv4 host parameters that must be correctly configured for a host to communicate with devices on remote networks?
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
Default gateway
The default gateway is the IP address of the router interface on the local subnet; when a host needs to communicate with a device on a remote network, it must forward packets to the default gateway because the destination is not reachable locally. The subnet mask is equally essential because the host uses it (along with its own IP address) to determine whether a destination IP address is on the same local network or a remote network; without a correctly configured subnet mask, the host cannot make this determination and may misroute traffic. DNS server address is only for name resolution and is not required for IP-level connectivity, MAC address is a Layer 2 address already present on the NIC, and hostname is a local identifier irrelevant to routing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DNS server address
Why it's wrong here
DNS is used to resolve domain names to IP addresses but is not required for basic IP connectivity to remote networks.
- ✓
Default gateway
Why this is correct
The default gateway is the router interface that allows a host to send traffic to destinations outside its local subnet.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Subnet mask
Why this is correct
The subnet mask defines which part of the IP address is the network portion and which is the host portion, enabling the host to determine if a destination is local or remote.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
MAC address
Why it's wrong here
A MAC address is a Layer 2 hardware address used for local delivery, but it is not a configurable IPv4 host parameter in the same sense; hosts automatically have a MAC address from the NIC.
- ✗
Host name
Why it's wrong here
A host name is a label for the device but is not required for IPv4 communication.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Default gatewayCorrect answer▾
Why this is correct
The default gateway is the router interface that allows a host to send traffic to destinations outside its local subnet.
✗DNS server addressWrong answer — click to see why▾
Why this is wrong here
A host can communicate using IP addresses directly without DNS. DNS is a service, not a mandatory parameter for routing.
✗MAC addressWrong answer — click to see why▾
Why this is wrong here
MAC addresses are not manually configured as part of IPv4 host parameters (they are burned into the NIC). The question asks for IPv4 host parameters that must be configured.
✗Host nameWrong answer — click to see why▾
Why this is wrong here
Host names are used for identification and can be resolved via DNS, but they are not essential for the host to send or receive IP packets.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a DNS server address is a mandatory host parameter for remote communication, but DNS is only a name-resolution service and not required for IP-level connectivity.
Detailed technical explanation
How to think about this question
When a host sends an IP packet, it performs a logical AND between its own IP address and subnet mask to derive its network address, then does the same with the destination IP. If the two network addresses differ, the host knows the destination is remote and must send the packet to the default gateway's MAC address via ARP. Without a correct subnet mask, the host might incorrectly classify a remote destination as local, causing ARP failures and no communication.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Default gateway — The default gateway is the IP address of the router interface on the local subnet; when a host needs to communicate with a device on a remote network, it must forward packets to the default gateway because the destination is not reachable locally. The subnet mask is equally essential because the host uses it (along with its own IP address) to determine whether a destination IP address is on the same local network or a remote network; without a correctly configured subnet mask, the host cannot make this determination and may misroute traffic. DNS server address is only for name resolution and is not required for IP-level connectivity, MAC address is a Layer 2 address already present on the NIC, and hostname is a local identifier irrelevant to routing.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This 200-301 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 200-301 exam.
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