- A
IP address: A unique identifier assigned to each device on a network.
An IP address uniquely identifies a network interface on a network.
- B
Subnet mask: A 32-bit number used to divide an IP address into network and host portions.
The subnet mask separates the network prefix from the host identifier.
- C
Default gateway: The router interface that connects a local network to external networks.
The default gateway routes traffic from the local network to other networks.
- D
DNS server: A server that resolves domain names to IP addresses.
DNS servers translate human-readable domain names into IP addresses.
- E
IP address: A 32-bit number used to divide an IP address into network and host portions.
Why wrong: Incorrect — this definition describes a subnet mask, not an IP address.
- F
Default gateway: A server that resolves domain names to IP addresses.
Why wrong: Incorrect — this definition describes a DNS server, not a default gateway.
EX200 Manage security Practice Question
This EX200 practice question tests your understanding of manage security. 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.
Match each networking term to its definition.
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: A unique identifier assigned to each device on a network.
The correct matches are: IP address (unique identifier), Subnet mask (network/host division), Default gateway (router to external networks), DNS server (name resolution). Common confusions include swapping definitions between IP address and subnet mask, or between default gateway and DNS server.
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.
- ✓
IP address: A unique identifier assigned to each device on a network.
Why this is correct
An IP address uniquely identifies a network interface on a network.
Related concept
CIDR notation defines the prefix length.
- ✓
Subnet mask: A 32-bit number used to divide an IP address into network and host portions.
Why this is correct
The subnet mask separates the network prefix from the host identifier.
Related concept
CIDR notation defines the prefix length.
- ✓
Default gateway: The router interface that connects a local network to external networks.
Why this is correct
The default gateway routes traffic from the local network to other networks.
Related concept
CIDR notation defines the prefix length.
- ✓
DNS server: A server that resolves domain names to IP addresses.
- ✗
IP address: A 32-bit number used to divide an IP address into network and host portions.
Why it's wrong here
Incorrect — this definition describes a subnet mask, not an IP address.
- ✗
Default gateway: A server that resolves domain names to IP addresses.
Why it's wrong here
Incorrect — this definition describes a DNS server, not a default gateway.
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 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.
Visual reference
Quick reference
IPv4 Address Class Summary
| 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.
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 EX200 subnetting questions on CIDR, address ranges, and subnet selection.
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Manage security — study guide chapter
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FAQ
Questions learners often ask
What does this EX200 question test?
Manage security — This question tests Manage security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: IP address: A unique identifier assigned to each device on a network. — The correct matches are: IP address (unique identifier), Subnet mask (network/host division), Default gateway (router to external networks), DNS server (name resolution). Common confusions include swapping definitions between IP address and subnet mask, or between default gateway and DNS server.
What should I do if I get this EX200 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 EX200 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 11, 2026
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