Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A host has the address 10.10.10.94/27. 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
10.10.10.32/27
This is wrong because the 32/27 subnet covers addresses 32 through 63, not 94.
B
Best answer
10.10.10.64/27
This is correct because 94 falls within the 64 through 95 range.
C
Distractor review
10.10.10.96/27
This is wrong because the 96/27 subnet begins above the host address.
D
Distractor review
10.10.10.0/27
This is wrong because the 0/27 subnet covers only 0 through 31.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming the host address belongs to the subnet with the closest starting address numerically, such as choosing 10.10.10.96/27 for 10.10.10.94 because 94 is near 96. This mistake ignores the fixed subnet increments defined by the /27 mask, which divides the address space into blocks of 32 addresses. Candidates often overlook that 10.10.10.64/27 covers addresses 64 through 95, which includes 94, and instead pick a subnet that starts above the host address. This error leads to incorrect subnet identification and can cause routing or access control issues in real networks.
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 subnetworks. A subnet mask, such as /27, determines how many bits are used for the network portion and how many for the host portion of the IP address. Specifically, a /27 mask uses 27 bits for the network, leaving 5 bits for host addresses, which creates subnets with 32 IP addresses each (2^5 = 32). This division helps optimize IP address allocation and improves network performance and security. To determine which subnet contains a specific host address, you calculate the subnet ranges based on the subnet mask. For a /27 mask, subnets increment in blocks of 32 addresses starting from 0. For example, the subnets are 0–31, 32–63, 64–95, 96–127, and so forth. The host address 10.10.10.94 falls within the 64–95 range, making 10.10.10.64/27 the correct subnet. This method ensures precise identification of the subnet and avoids misclassification. A common exam trap is confusing the subnet ranges or assuming the host address belongs to the nearest subnet numerically rather than calculating the exact block. For instance, mistakenly selecting 10.10.10.96/27 because 94 is close to 96 overlooks the subnet increments defined by the mask. In practical Cisco networking, accurate subnetting is critical for routing, access control, and network segmentation, making this skill essential for CCNA candidates to master.
KKey Concepts to Remember
- A /27 subnet mask uses 27 bits for the network and 5 bits for hosts, creating subnets with 32 IP addresses each.
- Subnet ranges increment in fixed blocks of 32 addresses when using a /27 mask, starting at 0 and increasing by 32.
- The host address 10.10.10.94 falls within the 10.10.10.64/27 subnet because it lies between 64 and 95 inclusive.
- Correct subnet identification requires calculating subnet boundaries rather than guessing based on numerical proximity.
- Cisco devices use subnet masks to determine routing and forwarding decisions based on the network portion of the IP address.
- Misidentifying subnets can cause routing failures and access control issues in Cisco networks.
- Subnetting skills are essential for configuring VLANs, ACLs, and routing protocols in the CCNA exam context.
- Understanding subnet increments helps avoid common exam traps related to IP address classification.
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 /27 subnet mask uses 27 bits for the network and 5 bits for hosts, creating subnets with 32 IP addresses each.
What is the correct answer to this question?
The correct answer is: 10.10.10.64/27 — A /27 mask creates subnets in blocks of 32 addresses. In plain language, that means the fourth-octet ranges are 0–31, 32–63, 64–95, 96–127, and so on. Since the host address ends in 94, it falls inside the 64–95 block. That means the subnet is 10.10.10.64/27. This is a classic subnetting task because it checks whether you can move from prefix length to block size and then locate the host inside the correct range. The key skill is recognizing the increment boundary and not guessing based only on the nearest familiar 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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