Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A small office uses a single router with DHCP enabled for 50 devices. Recently, some devices cannot obtain an IP address, while others work fine. The technician checks the DHCP lease table and sees that it is nearly full with 49 active leases. The network uses a default Class C subnet (255.255.255.0). Which of the following is the MOST appropriate solution to ensure all devices can obtain an IP address in the future?
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
Change the router's LAN IP address to a different private subnet, such as 10.0.0.1/8.
Changing the subnet entirely would require reconfiguring all devices and might cause more issues. The problem is specifically with the DHCP scope size, not the actual subnet address.
B
Distractor review
Reduce the DHCP lease time so that addresses are recycled more frequently.
Reducing lease time can help if the total number of devices is within the scope but many are temporary. However, if the scope is genuinely too small for the number of devices, reducing lease time will not solve the problem; it will only cause devices to renew more often and might still result in exhaustion during peak times.
C
Best answer
Increase the DHCP scope size by changing the subnet mask to /23 (255.255.254.0).
Changing the subnet mask to /23 doubles the number of usable IP addresses from 254 to 510. This expands the DHCP scope and allows more devices to obtain IP addresses without changing the router's IP or the network structure drastically. The router and devices must support the new mask, but in most small business environments this is the proper solution.
D
Distractor review
Disable DHCP on the router and assign static IP addresses to all devices.
Manually assigning static IPs to 50+ devices is time-consuming and error-prone. It also removes centralized management and can lead to conflicts if not carefully tracked. This is not the most appropriate solution for a growing network.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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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 user reports intermittent network connectivity on a desktop computer. The technician observes that the Ethernet link light on the NIC turns off for a few seconds and then turns back on. The cable passes a wiremap test, the switch port is verified good with another device, and the NIC driver is updated. The issue occurs more frequently when the computer's case fan runs at high speed. Which of the following is the MOST likely cause?
Question 2
A workstation is unable to connect to the internet. The technician runs the 'ipconfig' command and sees the IPv4 address is 169.254.15.200 with a subnet mask of 255.255.0.0. The workstation can ping other devices on the local subnet but cannot ping the default gateway or any external addresses. Which TWO actions should the technician take to resolve this issue? (Select two.)
Question 3
A workstation is connected to a managed switch. It obtains a valid IP address (192.168.10.50) from the DHCP server, but it cannot ping the default gateway (192.168.10.1). The link light on both the workstation NIC and the switch port are solid green. Other workstations on the same switch CAN ping the default gateway successfully. The technician accesses the switch management interface and finds that the workstation's port is configured as an access port on VLAN 10. The default gateway is located on VLAN 20. An inter-VLAN router is configured but not explicitly allowing VLAN 10 access to VLAN 20. Which of the following is the MOST likely cause of the problem?
Question 4
A company develops a web application that relies on a custom library available only for a specific Linux distribution. They want to deploy the application in the cloud with minimal administrative overhead, but they need full control over the software stack, including the ability to install the custom library and configure the web server. Which cloud service model BEST meets these requirements?
Question 5
A company has a legacy virtual machine running on a deprecated hypervisor (Hyper-V). They want to migrate this VM to a new hypervisor (VMware vSphere) hosted in a private cloud while preserving the VM's configuration, installed applications, and data. The migration must be performed with minimal downtime. Which of the following methods is MOST appropriate?
Question 6
A company hosts a critical database on a virtual machine in a public cloud. The database requires persistent storage that must be retained even if the VM is terminated. The storage must also be accessible from multiple VMs simultaneously for a future high-availability configuration. Which type of cloud storage BEST meets these requirements?
FAQ
Questions learners often ask
What does this 220-1101 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Increase the DHCP scope size by changing the subnet mask to /23 (255.255.254.0). — A Class C subnet with a /24 mask provides 254 usable IP addresses (minus the network and broadcast). However, the DHCP scope might be limited to a smaller range. The question implies the DHCP scope is nearly exhausted because the subnet mask is too restrictive or the scope range is too small. Changing the subnet mask to /23 expands the address pool to 510 usable IPs, accommodating more devices. Reducing lease time only delays the problem if the total number of devices exceeds the scope size. Changing the router's IP would disrupt the network. Statically assigning IPs is not scalable.
What should I do if I get this 220-1101 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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