Question 501 of 1,389
CCNA Network Infrastructure and Connectivity Practice Question
Which two statements accurately describe the relationship between a network address and a broadcast address in IPv4 subnetting?
⚠ Common exam trap
Be cautious not to confuse the roles of network and broadcast addresses with usable host addresses.
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
✓
The network address is the first address in the subnet block.
The network address identifies the beginning of the subnet block, and the broadcast address identifies the final address in that block. In practical terms, both are reserved and are not assigned to ordinary hosts. The usable host range falls between them. This is a very basic subnetting truth, but it is foundational for every other addressing calculation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The network address is the first address in the subnet block.
Why this is correct
In IPv4, the network address is the first (lowest) address within a subnet block, obtained by setting all host bits to 0. This address uniquely identifies the subnet and is used by routers in their routing tables; it cannot be assigned to any host interface. It is the starting boundary from which the usable host range begins.
- ✓
The broadcast address is the last address in the subnet block.
Why this is correct
The broadcast address is the last (highest) address in a subnet block, created by setting all host bits to 1. It is used to send data to all hosts within that subnet simultaneously and is not a valid host address. This boundary defines the end of the subnet's address range, complementing the network address at the start.
- ✗
Both addresses are normal host addresses that can be assigned to users.
Why it's wrong here
The network address and broadcast address are both reserved and cannot be assigned to end-user devices. The network address has all host bits set to 0, while the broadcast address has all host bits set to 1; only addresses strictly between these two endpoints are available as usable host addresses. Therefore, calling them normal host addresses misrepresents their reserved role in IPv4 subnetting.
When this WOULD be correct
In a hypothetical question asking which addresses can be assigned to hosts in a specific subnet configuration, if the context allowed for a broader interpretation of 'addresses' without specifying roles, this option could be correct if it included non-reserved addresses.
- ✗
The broadcast address always becomes the default gateway.
Why it's wrong here
The default gateway is not the broadcast address; it is the IP address of a router interface that resides within the subnet and is a usable host address. A broadcast address is used to send packets to every host in the subnet and cannot serve as a unicast destination. A router might use one of the usable host addresses, but the broadcast address is never used as the default gateway.
When this WOULD be correct
In a different question asking about the configuration of a specific network device where the broadcast address is mistakenly configured as the default gateway, this option could be correct. For example, if a question states that a network device is set up incorrectly and asks for the misconfigured address type, option D could be the right answer.
- ✗
These concepts exist only in IPv6 and not IPv4.
Why it's wrong here
These concepts are specific to IPv4, not IPv6. IPv4 uses both network and broadcast addresses to define subnet boundaries, whereas IPv6 does not have a broadcast address at all; it relies on multicast for group communication. Thus the statement incorrectly reverses the existence of these address types between the two protocol versions.
When this WOULD be correct
If the question were rephrased to ask about the differences between IPv4 and IPv6 addressing schemes, stating that network and broadcast addresses are concepts that exist only in IPv4 would be correct. For example, a question could ask which addressing scheme utilizes broadcast addresses, making option E accurate.
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.
✓The network address is the first address in the subnet block.Correct answer▾
Why this is correct
In IPv4, the network address is the first (lowest) address within a subnet block, obtained by setting all host bits to 0. This address uniquely identifies the subnet and is used by routers in their routing tables; it cannot be assigned to any host interface. It is the starting boundary from which the usable host range begins.
✗Both addresses are normal host addresses that can be assigned to users.Wrong answer — click to see why▾
Why this is wrong here
Both the network address and broadcast address are reserved addresses within a subnet and cannot be assigned to hosts. The network address identifies the subnet itself, and the broadcast address is used for one-to-all communication. Assigning them to hosts would cause conflicts.
★ When this WOULD be the correct answer
In a hypothetical question asking which addresses can be assigned to hosts in a specific subnet configuration, if the context allowed for a broader interpretation of 'addresses' without specifying roles, this option could be correct if it included non-reserved addresses.
Why candidates choose this
A student might think that since these are valid IP addresses within the subnet range, they could be used like any other host address, not realizing they are reserved by protocol standards.
✗The broadcast address always becomes the default gateway.Wrong answer — click to see why▾
Why this is wrong here
The default gateway is typically the IP address of a router interface on the subnet, which is a normal host address within the usable range. The broadcast address is the last address in the subnet and is reserved for broadcasting; it cannot be used as a gateway.
★ When this WOULD be the correct answer
In a different question asking about the configuration of a specific network device where the broadcast address is mistakenly configured as the default gateway, this option could be correct. For example, if a question states that a network device is set up incorrectly and asks for the misconfigured address type, option D could be the right answer.
Why candidates choose this
Some might mistakenly believe that the broadcast address serves as a gateway because it is a well-known address, but in practice, the gateway is a specific router interface, not the broadcast address.
✗These concepts exist only in IPv6 and not IPv4.Wrong answer — click to see why▾
Why this is wrong here
Network and broadcast addresses are fundamental to IPv4 subnetting and are defined in IPv4 standards. IPv6 does not use broadcast addresses; instead, it uses multicast and anycast. Therefore, stating these concepts exist only in IPv6 is factually incorrect.
★ When this WOULD be the correct answer
If the question were rephrased to ask about the differences between IPv4 and IPv6 addressing schemes, stating that network and broadcast addresses are concepts that exist only in IPv4 would be correct. For example, a question could ask which addressing scheme utilizes broadcast addresses, making option E accurate.
Why candidates choose this
Students may confuse IPv6's lack of broadcast with the idea that network and broadcast addresses are IPv6 concepts, especially since IPv6 uses different addressing mechanisms. However, the question explicitly refers to IPv4.
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?”
Visual reference
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Last reviewed: May 17, 2026
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