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What is the most common symptom of an incorrect VLAN configuration on a switch port?
a. The port transmits at a lower speed
b. The port cannot communicate with devices in its intended VLAN
c. The port loses its MAC address
d. The port becomes a trunk
Answer: b. The port cannot communicate with devices in its intended VLANc-sharpcorner
When a client is placed in the wrong VLAN, which issue would most likely occur?
a. Duplicate IP address detection
b. Inability to communicate with intended subnet resources
c. Excessive switch overhearing
d. Port flapping
Answer: b. Inability to communicate with intended subnet resourcesc-sharpcorner
Devices connected to two different VLANs will not communicate without:
a. Static routing on a switch
b. A common switchport mode access configuration
c. An inter-VLAN routing device
d. Equal VLAN IDs
Answer: c. An inter-VLAN routing devicesanfoundry+1
What is a consequence of not updating a VLAN assignment after a network change?
a. Broadcast storms increase
b. Devices experience line rate drops
c. End devices become isolated
d. All devices lose power
Answer: c. End devices become isolatedc-sharpcorner
Incorrect VLAN assignment can be verified using which Cisco command?
a. show interfaces status
b. show vlan brief
c. show spanning-tree
d. show port-security
Answer: b. show vlan briefwebasha
Which VLAN number is typically the default native VLAN on most switches?
a. 5
b. 10
c. 1
d. 100
Answer: c. 1sanfoundry
What happens if the native VLAN is different on two ends of a trunk link?
a. All VLAN traffic is dropped
b. Traffic spills into the wrong VLAN, causing communication problems
c. Spanning-tree blocks the port
d. IP addresses revert to default
Answer: b. Traffic spills into the wrong VLAN, causing communication problemsc-sharpcorner
Assigning a port to a VLAN that does not exist will result in which condition?
a. The port operates as an access port with default settings
b. The port becomes inactive until the VLAN is created
c. The port joins the management VLAN
d. The port becomes a trunk port
Answer: b. The port becomes inactive until the VLAN is createditexamanswers
What is a likely effect of inter-VLAN routing misconfiguration?
a. Increased collision domain size
b. Failure of communication between VLANs
c. Redundant links are disabled
d. Switch loops increase
Answer: b. Failure of communication between VLANswayground
A switch port connected to the wrong VLAN will:
a. Ignore all traffic
b. Only communicate with devices in its assigned VLAN
c. Block trunk ports
d. Reset its MAC address
Answer: b. Only communicate with devices in its assigned VLANsanfoundry
How can an incorrect VLAN tag in a frame affect data transmission?
a. Data is prioritized
b. Data is dropped or sent to the wrong VLAN
c. Data bypasses firewalls
d. Data is encrypted
Answer: b. Data is dropped or sent to the wrong VLANc-sharpcorner
Which troubleshooting step best detects incorrect VLAN configuration?
a. ping VLAN gateway
b. traceroute to all network devices
c. show vlan and compare intended assignments
d. reset all trunk ports
Answer: c. show vlan and compare intended assignmentswebasha
When configuring multiple VLANs for users and servers, what happens if a server is assigned to the user VLAN?
a. Users will lose their internet access
b. Server will be inaccessible from the server VLAN
c. Switch reboots
d. Server receives duplicate frames
Answer: b. Server will be inaccessible from the server VLANc-sharpcorner
Which protocol can cause VLAN traffic to leak into the wrong VLAN if not configured properly?
a. STP
b. 802.1Q
c. LLDP
d. ARP
Answer: b. 802.1Qc-sharpcorner
What command verifies the allowed VLANs on a trunk port?
a. show port-security
b. show trunk allowed vlan
c. show interfaces trunk
d. show native vlan
Answer: c. show interfaces trunknetworklessons
A user reports being unable to reach their printer, but both use DHCP and are on separate VLANs. Most likely reason:
a. Incorrect VLAN assignment on one port
b. DHCP pool exhausted
c. Printer is powered off
d. Spanning-tree protocol error
Answer: a. Incorrect VLAN assignment on one portc-sharpcorner
Which configuration step can prevent incorrect VLAN assignment on access ports?
a. Enable port-security
b. Set port mode to access and specify VLAN
c. Disable trunking globally
d. Configure spanning-tree priority
Answer: b. Set port mode to access and specify VLANc-sharpcorner
What is a common impact if an access port is mistakenly configured as a trunk?
a. Port disables DHCP
b. Other VLANs’ traffic is allowed through
c. Port receives only broadcast frames
d. Port becomes a native VLAN port
Answer: b. Other VLANs’ traffic is allowed throughnetworklessons
If a trunk is only allowing certain VLANs, what occurs if a required VLAN is not listed?
a. That VLAN’s traffic is blocked on the trunk
b. The trunk fails completely
c. Native VLAN is used as a fallback
d. All VLANs are allowed by default
Answer: a. That VLAN’s traffic is blocked on the trunknetworklessons
A port assigned the wrong VLAN ID might:
a. Be able to reach the switch management interface
b. Be unable to reach network resources in its logical group
c. Block DHCP for the entire VLAN
d. Flood all traffic
Answer: b. Be unable to reach network resources in its logical groupc-sharpcorner
The best way to avoid incorrect VLANs on multiple ports is:
a. Use static configuration with port security
b. Rely on dynamic VLAN assignment only
c. Use default VLAN
d. Don’t configure any VLANs
Answer: a. Use static configuration with port securitywebasha+1
Which scenario indicates an incorrect VLAN issue?
a. All devices receive duplicate packets
b. A device can ping only other devices assigned the same VLAN
c. Device sends frames tagged twice
d. Switch cycles between active and inactive
Answer: b. A device can ping only other devices assigned the same VLANsanfoundry+1
What is a mistake during trunk configuration that causes VLAN issues?
a. Omission of allowed VLANs
b. Assigning VLAN 0
c. Not setting a native VLAN
d. Not configuring GVRP
Answer: a. Omission of allowed VLANsnetworklessons+1
How does deleting a VLAN from a switch affect ports assigned to it?
a. Ports revert to default VLAN
b. Ports go inactive and lose connectivity
c. Ports trunk all traffic
d. Ports become part of management VLAN
Answer: b. Ports go inactive and lose connectivityitexamanswers
A technician finds a user can access resources in VLAN 10 but should be in VLAN 20. What should be done?
a. Create a new VLAN for the user
b. Reassign the port to VLAN 20
c. Change the user’s subnet mask
d. Adjust the port’s duplex
Answer: b. Reassign the port to VLAN 20sanfoundry
If two switches have mismatched native VLANs, the result is:
a. Prevented communication for untagged frames
b. Switches auto-correct the mismatch
c. Traffic is rerouted
d. All VLANs stop working
Answer: a. Prevented communication for untagged framesc-sharpcorner
Assigning a port to a VLAN already assigned to another port:
a. Causes a loop
b. Is a standard practice for grouping devices
c. Results in collision domain expansion
d. Automatically creates a trunk
Answer: b. Is a standard practice for grouping devicessanfoundry
Which tool best documents VLAN port assignments to prevent errors?
a. Network diagram
b. Spanning tree calculator
c. Bandwidth monitor
d. Subnet calculator
Answer: a. Network diagramc-sharpcorner
Which of the following could indicate a VLAN issue during troubleshooting?
a. All interfaces are administratively down
b. A ping only works within a port’s VLAN
c. MAC address table overflows
d. Switch CLI becomes unresponsive
Answer: b. A ping only works within a port’s VLANc-sharpcorner
Incorrect VLAN tagging most affects:
a. Bandwidth management
b. Layer 2 broadcast domains
c. Spanning tree recalculation
d. Device cooling
Answer: b. Layer 2 broadcast domainssanfoundry
If a port is configured as an access port for VLAN X but is physically connected to a device in VLAN Y, what happens?
a. Communication only with VLAN X
b. Port blocks all traffic
c. Device joins both VLANs
d. Port disables trunking
Answer: a. Communication only with VLAN Xsanfoundry+1
What setting must match on both ends of a trunk link to avoid VLAN problems?
a. Port speed
b. Native VLAN ID
c. Interface number
d. IP address
Answer: b. Native VLAN IDc-sharpcorner
The “show interfaces switchport” command helps verify what?
a. Network speed
b. Assigned VLAN and mode
c. MAC address table size
d. Trunk negotiation status
Answer: b. Assigned VLAN and modenetworklessons
A user suddenly loses access to a shared drive after a switch port change. Most likely cause?
a. User changed their cable
b. Port was assigned the wrong VLAN
c. Switchport security was enabled
d. The server was shutdown
Answer: b. Port was assigned the wrong VLANc-sharpcorner
Native VLAN mismatch on trunk links can lead to:
a. VLAN hopping vulnerabilities
b. MAC address flooding
c. CPU overloading
d. ARP storm
Answer: a. VLAN hopping vulnerabilitiesc-sharpcorner
After port migration to another switch, a user cannot access required network resources, but local resources work. Why?
a. Trunking is disabled on the port
b. Port assigned to wrong VLAN
c. MAC address aging is high
d. Subnet mask mismatch
Answer: b. Port assigned to wrong VLANc-sharpcorner
Correct VLAN configuration for access devices can be enforced by:
a. Using access control lists only
b. Port-security and regular audits
c. Using only trunk ports
d. Increasing switch buffer size
Answer: b. Port-security and regular auditswebasha
Which of these results from a missing “switchport access vlan” command on a port?
a. Port stays in VLAN 1
b. Port becomes blocking
c. Port only forwards tagged frames
d. Port floods all VLANs
Answer: a. Port stays in VLAN 1sanfoundry
A VLAN misconfiguration that causes an outage may best be rectified by:
a. Disabling all trunk ports
b. Restoring from configuration backup
c. Upgrading switch firmware
d. Changing device MAC addresses
Answer: b. Restoring from configuration backupc-sharpcorner
Assigning all ports to the same VLAN by accident leads to:
a. No impact
b. Single broadcast domain, potential congestion
c. VLAN ID overflow
d. Spanning-tree recalculation only
Answer: b. Single broadcast domain, potential congestionsanfoundry
A port configured as a trunk but connected to an end device:
a. Allows multiple VLAN traffic to end device, likely causing failure
b. Automatically blocks traffic
c. Restricts to native VLAN
d. Drops all frames
Answer: a. Allows multiple VLAN traffic to end device, likely causing failurenetworklessons
Which Cisco IOS command assigns VLAN 10 to an interface?
a. switchport trunk allowed vlan 10
b. switchport access vlan 10
c. vlan 10 name DATA
d. interface vlan 10
Answer: b. switchport access vlan 10sanfoundry
Moving a device to a new switch but keeping it in the same VLAN normally requires:
a. Confirming correct VLAN assignment on new port
b. New DHCP configuration
c. Spanning-tree reset
d. Reloading device drivers
Answer: a. Confirming correct VLAN assignment on new portc-sharpcorner
Which error often occurs if a trunk is missing a VLAN in its allow list?
a. All VLANs become inactive
b. Only the unlisted VLAN’s devices lose connectivity across the trunk
c. Trunk disables itself
d. Switch goes into error state
Answer: b. Only the unlisted VLAN’s devices lose connectivity across the trunkc-sharpcorner
A port meant for management is assigned to a user VLAN. Impact?
a. Management cannot reach the switch securely
b. VLAN becomes native VLAN
c. No impact, works as normal
d. Port speed decreases
Answer: a. Management cannot reach the switch securelyc-sharpcorner
A frame arrives on a switch with an unknown VLAN tag. What is the result?
a. Frame is dropped
b. VLAN is automatically created
c. VLAN tag is ignored
d. Frame is sent to VLAN 1
Answer: a. Frame is droppeditexamanswers
Which situation explains why a port joined to the wrong VLAN may pass traffic locally but not across switches?
a. Mismatched VLAN configurations trunking
b. Port operates in half-duplex
c. Switch disables spanning-tree
d. Port disables Power over Ethernet
Answer: a. Mismatched VLAN configurations trunkingc-sharpcorner
Best practice to prevent VLAN mistakes in a large network?
a. Use VLAN management protocol and port documentation
b. Only use VLAN 1 for all traffic
c. Set all ports to trunk by default
d. Allow dynamic VLAN only
Answer: a. Use VLAN management protocol and port documentationc-sharpcorner
VLAN configuration errors are typically found by:
a. Reviewing “show vlan brief” and checking port assignments against documentation
b. Running cable diagnostics
c. Flushing ARP tables
d. Rebooting switches
Answer: a. Reviewing “show vlan brief” and checking port assignments against documentationwebasha
The impact of configuring the wrong VLAN on an AP (Access Point) port is:
a. User wireless clients can’t obtain IP or connect to correct subnet
b. Switch disables PoE
c. Broadcast storms multiply
d. MAC address table fills rapidly
Answer: a. User wireless clients can’t obtain IP or connect to correct subnetc-sharpcorner

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