Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A host is assigned 192.168.10.33/28. Which subnet contains that host?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
192.168.10.16/28
This is wrong because the 16/28 block covers 16 through 31, not 33.
B
Best answer
192.168.10.32/28
This is correct because 33 falls within the 32 through 47 range.
C
Distractor review
192.168.10.48/28
This is wrong because the 48/28 block begins above the host address.
D
Distractor review
192.168.10.0/28
This is wrong because the 0/28 block covers only 0 through 15.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is misidentifying the subnet block by confusing the host IP address with the network address or incorrectly calculating the subnet increments. Candidates often mistake 192.168.10.33 as part of the 192.168.10.16/28 subnet because 33 is close to 16, but the /28 subnet increments by 16 addresses, so 16/28 covers 16–31 only. This mistake leads to selecting the wrong subnet and failing to recognize the correct network boundary. Understanding the exact block size and subnet ranges is essential to avoid this trap.
Technical deep dive
How to think about this question
Subnetting is a fundamental concept in IP networking that divides a larger network into smaller, manageable segments called subnets. Each subnet is defined by a network address and a subnet mask, which determines the size of the subnet and the range of IP addresses it contains. In the case of a /28 subnet mask, the mask uses 28 bits for the network portion, leaving 4 bits for host addresses, which results in 16 IP addresses per subnet block. To determine which subnet contains a specific host IP address, you calculate the subnet blocks by incrementing the last octet by the block size, which is 16 for a /28 mask. The subnets start at 0, 16, 32, 48, and so forth. Since the host IP address 192.168.10.33 falls between 32 and 47, it belongs to the 192.168.10.32/28 subnet. This method allows network engineers to quickly identify subnet boundaries and assign IP addresses correctly. A common exam trap is confusing the host address with the subnet address or miscalculating the block size. For example, assuming 192.168.10.33 belongs to the 192.168.10.16/28 subnet is incorrect because that subnet covers only 16 through 31. Understanding the block increments and correctly applying the subnet mask is crucial in Cisco CCNA exams and real-world network design to avoid misconfigurations and IP conflicts.
KKey Concepts to Remember
- A /28 subnet mask uses 28 bits for the network portion, leaving 4 bits for hosts, which creates subnets with 16 IP addresses each.
- Subnet blocks increment by 16 in the last octet for a /28 mask, defining subnet ranges such as 0–15, 16–31, 32–47, and so on.
- To identify the subnet containing a host, compare the host's last octet to the subnet ranges determined by the block size.
- The network address is the first IP in the subnet block, and the broadcast address is the last IP in that block, which cannot be assigned to hosts.
- Misidentifying the subnet block by confusing host addresses with network addresses is a common exam trap in subnetting questions.
- Correct subnetting ensures proper IP address allocation, prevents IP conflicts, and supports efficient routing in Cisco networks.
- Subnetting questions test your ability to quickly calculate subnet boundaries and apply subnet masks accurately under exam conditions.
- Understanding subnet increments and ranges is essential for configuring VLANs, ACLs, and routing protocols that rely on IP addressing.
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.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
A /28 subnet mask uses 28 bits for the network portion, leaving 4 bits for hosts, which creates subnets with 16 IP addresses each.
What is the correct answer to this question?
The correct answer is: 192.168.10.32/28 — A /28 subnet uses blocks of 16 addresses. In plain language, the last octet ranges move in increments of 16: 0–15, 16–31, 32–47, 48–63, and so on. Since the host address ends in 33, it belongs to the 32–47 block. That means the containing subnet is 192.168.10.32/28. This style of subnetting question is common because it tests whether you can identify the correct network boundary quickly. The key is to recognize the block size from the prefix and then place the address inside the correct interval without confusing the host with the network address.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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