- A
IP address: Unique identifier for a device on an IP network
Classful addressing uses fixed boundaries (/8, /16, /24) based on the first octet, which is its most accurate role.
- B
Subnet mask: Determines which part of an IP address is the network and which is the host
CIDR (Classless Inter-Domain Routing) is a method for IP address allocation and route aggregation, not a fixed-boundary scheme.
- C
Default gateway: IP address of the router that forwards traffic to other networks
VLSM (Variable Length Subnet Mask) allows subnetting a network into subnets of different sizes, not fixed boundaries.
- D
DNS server: Resolves domain names to IP addresses
NAT (Network Address Translation) translates private IP addresses to public ones, not related to fixed IP boundaries.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. 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. A key principle to apply: a subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.. 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.
Match each basic IPv4 concept to its most accurate role.
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
IP address: Unique identifier for a device on an IP network
The subnet mask is a 32-bit value that distinguishes the network portion from the host portion of an IPv4 address, enabling devices to determine their subnet membership. The default gateway is the IP address of the local router, which serves as the next hop for traffic destined to subnets outside the local network. The broadcast address, typically the highest address in a subnet, is used to send a single packet to all hosts within the same broadcast domain. A host address is a unique IP assigned to a single device's interface within a subnet, allowing it to be identified individually.
Key principle: A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IP address: Unique identifier for a device on an IP network
Why this is correct
Classful addressing uses fixed boundaries (/8, /16, /24) based on the first octet, which is its most accurate role.
Related concept
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
- ✓
Subnet mask: Determines which part of an IP address is the network and which is the host
Why this is correct
CIDR (Classless Inter-Domain Routing) is a method for IP address allocation and route aggregation, not a fixed-boundary scheme.
Related concept
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
- ✓
Default gateway: IP address of the router that forwards traffic to other networks
Why this is correct
VLSM (Variable Length Subnet Mask) allows subnetting a network into subnets of different sizes, not fixed boundaries.
Related concept
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
- ✓
DNS server: Resolves domain names to IP addresses
Why this is correct
NAT (Network Address Translation) translates private IP addresses to public ones, not related to fixed IP boundaries.
Related concept
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Do not confuse classful addressing with CIDR or VLSM. Classful addressing is defined by fixed boundaries per class, while classless methods allow variable-length subnet masks. NAT is a separate concept for address translation.
Detailed technical explanation
How to think about this question
IPv4 addressing relies on several fundamental concepts to enable proper communication within and outside a subnet. The subnet mask is a 32-bit value that divides the IP address into network and host portions, determining which bits identify the subnet and which identify individual hosts. The host address is the unique identifier assigned to each device within that subnet, allowing devices to communicate locally. The broadcast address is a special address within the subnet that targets all hosts simultaneously, used for network-wide announcements or discovery protocols. The default gateway is the IP address of a router interface that serves as the next hop for traffic destined outside the local subnet, enabling communication beyond the immediate network. The decision process for routing IPv4 traffic depends on these concepts. When a host sends a packet, it uses the subnet mask to determine if the destination IP is within the same subnet. If it is, the packet is sent directly to the destination host. If not, the packet is forwarded to the default gateway, which routes it toward the remote network. The broadcast address is never assigned to a host but is reserved to reach all devices in the subnet simultaneously, such as for ARP requests or DHCP discovery messages. This clear separation of roles ensures efficient local and remote communication. A frequent exam trap involves confusing the broadcast address with a usable host address or misunderstanding the default gateway's role. In Cisco devices, the default gateway must be reachable within the local subnet, and misconfiguring it can cause loss of connectivity to external networks. Additionally, the subnet mask must be correctly applied to identify network boundaries; otherwise, hosts may incorrectly assume traffic is local or remote. Understanding these behaviors in Cisco IOS and typical network topologies helps avoid misconfigurations and exam errors.
KKey Concepts to Remember
- A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
- A default gateway is the IP address of the router interface that forwards traffic destined for remote networks outside the local subnet.
- A broadcast address is a special IPv4 address used to send packets to all hosts within the local subnet simultaneously.
- A host address uniquely identifies a single device within a subnet and must not be the network or broadcast address.
- IPv4 hosts use the subnet mask to decide if a destination IP is local or requires forwarding to the default gateway.
- The default gateway must reside within the same subnet as the host to enable proper routing of off-subnet traffic.
- Broadcast addresses cannot be assigned to hosts and are reserved for network-wide communication like ARP and DHCP.
- Misunderstanding the roles of subnet mask, default gateway, broadcast, and host addresses leads to common subnetting and routing errors.
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
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
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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 — A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet..
What is the correct answer to this question?
The correct answer is: IP address: Unique identifier for a device on an IP network — The subnet mask is a 32-bit value that distinguishes the network portion from the host portion of an IPv4 address, enabling devices to determine their subnet membership. The default gateway is the IP address of the local router, which serves as the next hop for traffic destined to subnets outside the local network. The broadcast address, typically the highest address in a subnet, is used to send a single packet to all hosts within the same broadcast domain. A host address is a unique IP assigned to a single device's interface within a subnet, allowing it to be identified individually.
What should I do if I get this 200-301 question wrong?
Review a subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A subnet mask determines which bits of an IPv4 address represent the network and which represent the host portion within a subnet.
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Last reviewed: Apr 12, 2026
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