Match each address-related concept to its most accurate meaning.
Drag a concept onto its matching description — or click a concept then click the description.
Indicates network versus host portions of an IPv4 address
Next-hop path used for off-subnet traffic
Address used to reach all hosts in the local broadcast domain
Address that identifies the subnet itself
⚠ Common exam trap
The exam often tests your ability to differentiate between IP addresses, MAC addresses, subnet masks, and default gateways. Be careful not to confuse the function of each, especially since they are all related to addressing and routing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Subnet mask: Indicates network versus host portions of an IPv4 address
The subnet mask is used to distinguish the network portion from the host portion of an IPv4 address. The default gateway is the next-hop router that forwards traffic destined for off-subnet networks. The broadcast address sends packets to all hosts within the local broadcast domain, while the network address identifies the subnet itself and is the first address in the subnet range.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Subnet mask: Indicates network versus host portions of an IPv4 address
Why this is correct
A subnet mask is a 32-bit dotted-decimal or prefix-length value that uses contiguous 1s to separate the network portion from the host portion of an IPv4 address. By comparing the mask with an IP address, devices can determine whether a destination lies on the local subnet or requires forwarding to a router. It is essential for logically dividing networks and for calculating the exact range of available host addresses.
Default gateway: Next-hop path used for off-subnet traffic
Why this is correct
The default gateway is the IP address of the local router interface that a host uses as its next hop for any packet whose destination subnet is not directly connected. When a host determines that a target is off-subnet, it encapsulates the packet with the gateway's MAC address while keeping the destination IP unchanged. This enables communication beyond the local broadcast domain without requiring every host to maintain full routing tables.
Broadcast address: Address used to reach all hosts in the local broadcast domain
Why this is correct
Broadcast address is a special IPv4 address within each subnet where all host bits are set to binary 1, enabling a single frame to reach every interface on that local broadcast domain. It is never assigned to an individual host and is not forwarded by routers across subnets, limiting its scope to the local segment. This makes it the standard targeting mechanism for protocols like ARP requests and DHCP discovery.
Network address: Address that identifies the subnet itself
Why this is correct
Network address is the lowest address in a subnet, formed by setting all host bits to 0, and it acts as the numeric identifier of the subnet itself in routing tables. Because it represents the entire prefix, it cannot be configured as a valid host IP on any interface. Routers use this address to determine the network path and to summarize routes.
Visual reference
Quick reference
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
Go deeper
Learn chapter
IPv4 Addressing and Address Classes
Key term
IPv4
IPv4 is the fourth version of the Internet Protocol, a set of rules that assigns unique numerical addresses to devices so they can communicate over networks like the internet.
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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