Top 10 VLAN Interview Questions and Answers

DHCP is a network protocol that assigns IP addresses automatically, while VLAN is a way to segment a network into separate virtual networks.

• DHCP stands for Dynamic Host Configuration Protocol

• DHCP automatically assigns IP addresses to devices on a network

• VLAN stands for Virtual Local Area Network

• VLANs allow for segmentation of a network into separate virtual networks

• VLANs can improve network security and efficiency

VPN is a secure connection between two networks while VLAN is a logical grouping of devices on a network.

• VPN stands for Virtual Private Network and is used to securely connect two networks over the internet.

• VPN uses encryption to protect data transmitted over the network.

• VLAN stands for Virtual Local Area Network and is used to logically group devices on a network.

• VLANs can be used to separate traffic on a network for security or performance reasons.

• For example, a company mig...read more

A VLAN is a logical grouping of network devices that share the same broadcast domain. OSI model has 7 layers.

• VLAN separates broadcast domains in a switched network

• It allows network administrators to group hosts together based on their functions

• Each VLAN has a unique ID and can span multiple switches

• OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application

PCs in different VLANs can communicate through a router or layer 3 switch.

• Use a router or layer 3 switch to route traffic between VLANs

• Configure inter-VLAN routing on the router or layer 3 switch

• Ensure proper VLAN tagging and routing settings are in place

VLAN stands for Virtual Local Area Network. It is a network of computers that behave as if they are connected to the same switch, even if they are not physically located on the same network switch.

• VLANs are used to segment network traffic and improve network performance and security.

• They are configured on network switches or routers.

• VLAN configuration involves assigning ports to specific VLANs and setting up VLAN trunks for inter-VLAN communication.

• Examples of VLAN configurat...read more

VLAN stands for Virtual Local Area Network, used to segment network traffic. VTP stands for VLAN Trunking Protocol, used to manage VLAN configuration.

• VLAN is used to divide a physical network into multiple logical networks

• VLANs help in improving network performance, security, and manageability

• VTP is used to synchronize VLAN configurations across multiple switches in a network

The number of VLANs that can be configured in an L2 switch depends on the specific model and manufacturer, but typically ranges from 4 to 4096.

• The number of VLANs supported by an L2 switch is determined by the switch's hardware capabilities and software limitations.

• Most L2 switches support a minimum of 4 VLANs and a maximum of 4096 VLANs.

• Higher-end switches may support even more VLANs, while lower-end switches may have a lower limit.

• Some switches may have restrictions on the ...read more

VLAN is a virtual LAN that allows network devices to communicate as if they were on the same physical network. ABR router is a router that connects two or more areas in a network.

• VLAN separates a physical network into multiple logical networks

• Devices in different VLANs cannot communicate without a router

• ABR router connects different areas in a network, such as OSPF areas or IS-IS levels

• ABR router maintains separate routing tables for each area it connects

VLAN stands for Virtual Local Area Network. VLAN port modes determine how a switch port behaves in relation to VLANs.

• VLAN is a logical grouping of devices on the same network segment

• VLAN port modes include access, trunk, and hybrid

• Access mode assigns a port to a specific VLAN

• Trunk mode allows the port to carry traffic for multiple VLANs

• Hybrid mode allows the port to carry both tagged and untagged traffic

Vxlan is a virtual extensible LAN technology used to extend Layer 2 networks over Layer 3 networks.

• Vxlan stands for Virtual Extensible LAN

• It is used to extend Layer 2 networks over Layer 3 networks

• Vxlan adds a 24-bit identifier to the Layer 2 frame, allowing for up to 16 million virtual networks

• Vxlan encapsulates the original Ethernet frame within a UDP packet for transmission over the network

• Vxlan is commonly used in cloud environments for network virtualization

VLAN is used to segment network traffic, while voice VLAN is used to prioritize voice traffic.

• VLAN is used to separate network traffic into different virtual networks.

• Voice VLAN is a feature that allows voice traffic to be prioritized on the network.

• Commands like 'switchport mode access' and 'switchport voice vlan' are used to configure VLAN and voice VLAN access.

Adding a new VLAN to a production network involves several steps and enabling it requires configuration changes.

• Plan the new VLAN configuration including VLAN ID, subnet, and gateway.

• Configure the switch or router to create the new VLAN.

• Assign ports to the new VLAN as needed.

• Enable routing between the new VLAN and other VLANs if required.

• Test the new VLAN to ensure connectivity and functionality.

• Examples: VLAN 20 with subnet 192.168.20.0/24 and gateway 192.168.20.1.

• Examples: ...read more

Native VLAN is used for untagged traffic, default VLAN is used when no VLAN is specified, DHCP process involves client requesting IP address from server.

• Native VLAN is used for untagged traffic on a trunk port

• Default VLAN is used when no VLAN is specified, typically VLAN 1

• DHCP process involves client sending a DHCP discover message, server offering an IP address, client requesting the offered IP address, and server acknowledging the request

VPN stands for Virtual Private Network, used to securely connect remote users or networks. VLAN stands for Virtual Local Area Network, used to segment network traffic.

• VPN allows users to securely access a private network over a public network like the internet

• VLAN divides a physical network into multiple virtual networks for better traffic management

• VPN encrypts data to ensure privacy and security during transmission

• VLAN helps in improving network performance by reducing broa...read more

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used to manage VLAN configurations across a network. VLANs are virtual LANs that separate broadcast domains.

• VTP is used to synchronize VLAN information across switches in a network

• It helps in reducing the administrative overhead of manually configuring VLANs on each switch

• VLANs are used to logically segment a network into separate broadcast domains

• VLANs improve network performance and security by isolating traffic

DHCP is a network protocol that allows devices to obtain IP addresses and other network configuration settings automatically.

• DHCP stands for Dynamic Host Configuration Protocol.

• It is used to assign IP addresses dynamically to devices on a network.

• The DORA process in DHCP stands for Discover, Offer, Request, and Acknowledge.

• During the DORA process, a client sends a DHCP Discover message to find available DHCP servers.

• The DHCP server responds with a DHCP Offer message, providin...read more