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CCNA Practice Question: Which TWO of the following are essential IPv4…
This 200-301 practice question tests your understanding of 200-301 exam topics. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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
For a host to reach devices on remote networks, it must have a default gateway (which routes traffic to other networks) and a subnet mask (which distinguishes the network portion from the host portion, enabling the host to determine if a destination is local or remote). While an IP address is also required, it is not listed as an option here; DNS is used for name resolution but is not essential for basic IP connectivity to remote networks.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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
CIDR notation defines the prefix length.
- ✓
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
CIDR notation defines the prefix length.
- ✗
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: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Default gateway — For a host to reach devices on remote networks, it must have a default gateway (which routes traffic to other networks) and a subnet mask (which distinguishes the network portion from the host portion, enabling the host to determine if a destination is local or remote). While an IP address is also required, it is not listed as an option here; DNS is used for name resolution but is not essential for basic IP connectivity to remote networks.
What should I do if I get this 200-301 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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