Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A small office uses a single router that provides DHCP services for the LAN. The router is connected to a switch, and all workstations are connected to the switch. Two workstations (Workstation A and Workstation B) are unable to obtain an IP address from DHCP. They both receive APIPA addresses. Other workstations on the same switch obtain IP addresses and can access the internet. The technician checks the router's DHCP server logs and sees that the pool is not exhausted. Which of the following is the MOST likely cause of the issue?
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
Port security on the switch is limiting the number of MAC addresses per port
Port security can restrict the number of devices (MAC addresses) allowed on a switch port. If the port is configured for a single device and two workstations are sharing a port or the limit is exceeded, DHCP requests may be blocked, causing those devices to get APIPA addresses.
B
Distractor review
The default gateway address is incorrect on the router
An incorrect default gateway would affect internet access after obtaining an IP, but it would not prevent devices from getting an DHCP lease. The devices are failing at the initial DHCP negotiation.
C
Distractor review
The switch ports used by the affected workstations are assigned to a different VLAN than the router
If the switch ports were in a different VLAN, no devices on those ports would be able to communicate with the router or DHCP server, affecting all devices on that port, not just some. Other devices on the same switch work fine, so this is unlikely.
D
Distractor review
The DHCP relay agent on the switch is misconfigured
A DHCP relay is used to forward DHCP requests across subnets. Since the DHCP server (router) is on the same subnet as the clients, no relay is needed. A misconfigured relay would not apply here.
Common exam trap
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Technical deep dive
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
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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?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: Port security on the switch is limiting the number of MAC addresses per port — Port security on the switch can limit the number of MAC addresses allowed on a port. If two workstations are connected to the same switch port (or if the switch port has a low MAC address limit), the switch may drop DHCP requests from one or both devices after the limit is reached, causing them to fail to get an IP address and fall back to APIPA. Since the DHCP pool is not exhausted, and only two specific workstations are affected, port security is a likely cause. An incorrect default gateway would not prevent DHCP. A VLAN mismatch would prevent all devices from communicating with the DHCP server, not just two. A misconfigured DHCP relay is only needed if the DHCP server is on a different subnet, but the scenario says the router provides DHCP, so it's on the same subnet.
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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