Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
What is the usable host range for subnet 10.1.1.192/27?
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
Best answer
10.1.1.193 to 10.1.1.222
This is correct because .192 is the network and .223 is the broadcast, leaving .193 through .222 as usable hosts.
B
Distractor review
10.1.1.192 to 10.1.1.223
This is wrong because those include the network and broadcast addresses.
C
Distractor review
10.1.1.194 to 10.1.1.223
This is wrong because it excludes one valid host and includes the broadcast address.
D
Distractor review
10.1.1.160 to 10.1.1.191
This is wrong because that range belongs to a different /27 subnet.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is including the network or broadcast address as usable hosts. For example, selecting 10.1.1.192 or 10.1.1.223 as host IPs is incorrect because these addresses serve special roles: the network address identifies the subnet, and the broadcast address targets all hosts in the subnet. Candidates may also mistakenly shift the range by one address, either excluding valid hosts or including the broadcast address. This confusion often arises from not fully understanding subnet boundaries or the role of reserved addresses, leading to incorrect answers despite correctly identifying the subnet block.
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 subnet mask, which determines the number of bits used for the network portion and the host portion of an IP address. In the case of a /27 mask, 27 bits are used for the network, leaving 5 bits for host addresses. This results in 2^5 = 32 total addresses per subnet block. To identify the usable host range within a /27 subnet, you first determine the subnet block boundaries. For 10.1.1.192/27, the block starts at 10.1.1.192 and ends at 10.1.1.223. The first address (10.1.1.192) is the network address, and the last address (10.1.1.223) is the broadcast address. These two addresses cannot be assigned to hosts. Therefore, the usable host range is the addresses between them, from 10.1.1.193 to 10.1.1.222. A common exam trap is confusing the network and broadcast addresses with usable hosts, leading to incorrect ranges. Cisco devices rely on correct subnetting to route traffic properly and avoid IP conflicts. In practical networking, assigning IPs within the usable range ensures devices communicate effectively without address overlap or broadcast issues. Mastery of subnet calculations is essential for CCNA candidates to design and troubleshoot IP networks accurately.
KKey Concepts to Remember
- A /27 subnet mask corresponds to 255.255.255.224, which divides an IP address block into subnets containing 32 total addresses each.
- The first address in any subnet is the network address and cannot be assigned to hosts because it identifies the subnet itself.
- The last address in any subnet is the broadcast address and is reserved for sending packets to all hosts within that subnet.
- The usable host range in a subnet excludes both the network and broadcast addresses, leaving the addresses in between for device assignment.
- Subnetting requires calculating the subnet block size and identifying the network and broadcast addresses to determine valid host IPs.
- Cisco devices use subnet masks to determine whether a destination IP is local or remote, affecting routing and forwarding decisions.
- Misidentifying the network or broadcast address leads to common exam traps where candidates include invalid host addresses.
- Understanding subnet boundaries and address allocation is critical for configuring IP addressing schemes in Cisco networks.
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.
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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 corresponds to 255.255.255.224, which divides an IP address block into subnets containing 32 total addresses each.
What is the correct answer to this question?
The correct answer is: 10.1.1.193 to 10.1.1.222 — A /27 subnet contains 32 total addresses. In plain language, the 10.1.1.192/27 block runs from 10.1.1.192 through 10.1.1.223. The first address is the network address and the last is the broadcast address, so the usable host range is 10.1.1.193 through 10.1.1.222. This is a common subnetting question because it checks whether you can move from subnet boundary to valid host range. The key is to identify the block correctly and then exclude the reserved first and last addresses.
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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