Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A host address is 10.100.12.94/26. Which address is the broadcast address for that subnet?
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
10.100.12.63
This is wrong because .63 is the broadcast address of the previous /26 block.
B
Best answer
10.100.12.127
This is correct because .94 is in the 64-127 /26 range.
C
Distractor review
10.100.12.64
This is wrong because .64 is the network address of that subnet.
D
Distractor review
10.100.12.128
This is wrong because .128 starts the next subnet.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is selecting the broadcast address of the wrong subnet block. Candidates often mistake 10.100.12.63 as the broadcast address because it ends with .63, which looks similar to the /26 block size. However, .63 is actually the broadcast address of the previous subnet (0-63). Another trap is confusing the network address (10.100.12.64) with the broadcast address. Misidentifying these boundaries leads to incorrect subnetting answers and can cause routing and communication 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 /26 subnet mask means the first 26 bits are fixed for the network portion, leaving 6 bits for host addresses. This results in 64 IP addresses per subnet, including network and broadcast addresses. The subnet mask 255.255.255.192 corresponds to /26, which splits the IP address range into blocks of 64 addresses. To find the broadcast address for a given host IP and subnet mask, you first identify the subnet block the IP belongs to by calculating the block size (256 minus the last octet of the subnet mask). For /26, the block size is 64, so the subnets are 0-63, 64-127, 128-191, and 192-255. Since 10.100.12.94 falls within 64-127, the broadcast address is the last address in that block, 10.100.12.127. A common exam trap is confusing the broadcast address with the network address or the broadcast address of an adjacent subnet. For example, 10.100.12.63 is the broadcast for the previous subnet (0-63), and 10.100.12.64 is the network address of the current subnet. Understanding the block boundaries and correctly identifying the subnet range prevents this mistake. In practical Cisco networking, accurate broadcast address calculation is essential for proper subnet communication and avoiding IP conflicts.
KKey Concepts to Remember
- A /26 subnet mask divides the IP address space into blocks of 64 addresses, including network and broadcast addresses.
- The broadcast address is the highest IP address in the subnet block and is used to send packets to all hosts within that subnet.
- To find the subnet block, subtract the last octet of the subnet mask from 256 to determine the block size for the fourth octet.
- The network address is the first IP address in the subnet block and cannot be assigned to hosts.
- Hosts with IP addresses within a subnet range share the same network and broadcast addresses for communication.
- Incorrectly identifying the broadcast address as the network address or an adjacent subnet’s broadcast address is a common subnetting error.
- Cisco devices use subnet masks to determine the network and broadcast boundaries for routing and forwarding decisions.
- Understanding subnet boundaries is critical for configuring IP addressing and avoiding address conflicts 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.
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.
CCNA subnetting practice questions
Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
CCNA OSPF practice questions
Practise OSPF neighbours, router IDs, metrics, areas and routing-table interpretation.
CCNA VLAN practice questions
Practise VLANs, access ports, trunks, allowed VLANs and switching scenarios.
CCNA STP practice questions
Practise spanning tree, root bridge election, port roles and STP troubleshooting.
CCNA EtherChannel practice questions
Practise LACP, PAgP, port-channel behaviour and bundle requirements.
CCNA ACL practice questions
Practise standard and extended ACLs, permit/deny logic and traffic filtering.
CCNA NAT practice questions
Practise static NAT, dynamic NAT, PAT and inside/outside address translation.
CCNA DHCP practice questions
Practise DHCP scopes, relay, leases and troubleshooting.
CCNA show ip route practice questions
Practise routing-table output, longest-prefix match, AD and route selection.
CCNA show interfaces trunk practice questions
Practise trunk verification and VLAN forwarding across switches.
CCNA wireless security practice questions
Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
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 /26 subnet mask divides the IP address space into blocks of 64 addresses, including network and broadcast addresses.
What is the correct answer to this question?
The correct answer is: 10.100.12.127 — A /26 subnet has a block size of 64. In practical terms, the fourth-octet blocks are 0-63, 64-127, 128-191, and 192-255. Because 94 falls into the 64-127 block, the broadcast address is 10.100.12.127. This is a boundary-calculation question that checks whether you can identify the correct /26 range first.
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.
Discussion
Loading comments…
Sign in to join the discussion.