Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A host address is 192.168.88.66/27. Which address is the network address of the 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
192.168.88.32
This is wrong because that is the previous /27 block.
B
Best answer
192.168.88.64
This is correct because .66 is in the 64-95 /27 subnet.
C
Distractor review
192.168.88.95
This is wrong because .95 is the broadcast address of the block, not the network address.
D
Distractor review
192.168.88.96
This is wrong because that is the start of the next /27 block.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking the broadcast address or the start of the next subnet block for the network address. For example, 192.168.88.95 is the broadcast address for the 192.168.88.64/27 subnet, not the network address. Similarly, 192.168.88.96 is the start of the next subnet block. Selecting these addresses as the network address leads to incorrect subnetting and routing errors. The key is to remember that the network address is always the first address in the subnet range, which is a multiple of the block size.
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. Each subnet has a unique network address, which identifies the subnet itself, and a range of host addresses within that subnet. The subnet mask, such as /27 in this question, determines the size of each subnet and how the IP address space is divided. A /27 mask means 27 bits are fixed for the network portion, leaving 5 bits for host addresses, resulting in 32 IP addresses per subnet block. To find the network address for an IP with a /27 mask, you calculate the block size as 2^(32-27) = 32 addresses. The IP address 192.168.88.66 falls within the range 192.168.88.64 to 192.168.88.95. The network address is always the first address in the block, which is 192.168.88.64. This calculation is critical in Cisco networking for proper subnet design, routing, and access control. A common exam trap is confusing the network address with the broadcast address or the start of adjacent subnets. For example, 192.168.88.95 is the broadcast address for the 64-95 block, not the network address. Misidentifying the network address can lead to incorrect subnetting decisions and routing errors. Practically, Cisco devices use the network address to identify subnets in routing tables and ACLs, so precise calculation is essential.
KKey Concepts to Remember
- A /27 subnet mask divides an IP network into blocks of 32 addresses, including network and broadcast addresses.
- The network address is the first IP address in the subnet block and identifies the subnet itself.
- Host addresses fall between the network address and the broadcast address within the subnet range.
- The broadcast address is the last IP address in the subnet block and is used to send packets to all hosts in the subnet.
- Subnetting calculations require identifying the block size and matching the host IP to the correct subnet range.
- Cisco routers and switches use the network address to route traffic and apply subnet-specific policies.
- Confusing the broadcast address or adjacent subnet addresses with the network address is a common subnetting mistake.
- Understanding subnet boundaries is essential for designing scalable and efficient IP networks in Cisco environments.
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 /27 subnet mask divides an IP network into blocks of 32 addresses, including network and broadcast addresses.
What is the correct answer to this question?
The correct answer is: 192.168.88.64 — A /27 subnet has a block size of 32. In practical terms, the fourth-octet ranges are 0-31, 32-63, 64-95, and so on. Because 66 falls within the 64-95 block, the network address is 192.168.88.64. This is a classic subnet-boundary calculation. The key step is identifying the correct block 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.