Vlan Interview Questions And Answers 5gbh

5/28/2017

VLAN Interview Questions and Answers | Networker Interview

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VLAN Interview Questions and Answers

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What is a VLAN and how it will reduce the broadcast tra񷇂c? A VLAN is a logical grouping of network s and resources connected to istratively deíned ports on a switch. VLAN divides the Broadcast Domain So, the frames that will be broadcasted onto the network are only switched between the ports logically grouped within the same VLAN.

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What is the di�erence between an access port and a trunk port?

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Access port - Access Port belongs to and carries the tra񷇂c of only one VLAN. Anything arriving on an access port is simply assumed to belong to the VLAN assigned to the port. Any device attached to an access link is unaware of a VLAN hip as switches remove any VLAN information from the frame before it’s forwarded out to an access-link device. Access-link devices can’t communicate with devices outside their VLAN unless the packet is routed. Trunk Ports - Trunk Port can carry the tra񷇂c of multiple VLANs from 1 to 4094 VLans at a time. Normally

            

Trunk link is used to connect switches to other switches or to routers. Trunk ports s tagged and untagged tra񷇂c simultaneously. What is Frame Tagging and di�erent types of Frame Tagging? Frame tagging method uniquely assigns a VLan ID to each frame. It is used to identify the VLAN that the

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Frame belongs to. There are mainly two types of Frame Tagging Method:1.Inter-Switch Link (ISL) 2.802.1Q These are also known as Frame Encapsulation Protocols.

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Explain di�erence between 802.1Q and ISL ? 802.1Q - It is an open standard created by the Institute of Electrical and Electronics Engineers (IEEE). To Identify to which VLAN a frame belongs to, a íeld is inserted into the frame's header. It is a Light Weighted Protocol & adds only 4 Byte within Frame's Header. ISL (Inter-Switch Link) - This protocol is Cisco proprietary which means unlike 802.1Q, it can be used only between Cisco switches. ISL works by adding Header (26 Bytes) and Trailer(4 Bytes) with Original Ethernet Frame. What is a Native VLAN and What type of tra񷇂c will go through Native VLAN?

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The Trunk port is assigned a default VLAN ID for a VLAN that all untagged tra񷇂c will travel on. This VLAN is called the Native VLAN and is always VLAN 1 by default (but can be changed to any VLAN number). Similarly, any untagged or tagged tra񷇂c with unassigned VLAN ID is assumed to belong to the Native VLAN. What is Inter-Vlan Routing? VLANs divide broadcast domains in a LAN environment So, by default only Hosts that are of the same VLAN can communicate. Whenever hosts in one VLAN need to communicate with hosts in another

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VLAN, the tra񷇂c must be routed between them. This is known as Inter-VLAN routing. This can be done by two methods - Router-On-Stick & Switch Virtual Interfaces (SVI) Give the commands to create VLAN?

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5/28/2017

VLAN Interview Questions and Answers | Networker Interview

Give the commands to create VLAN? Switch(coníg)# vlan 10 Switch(coníg-vlan)# name sales Switch(coníg-vlan)# exit How can we add an interface to a VLAN? Switch(coníg)# interface fastethernet0/0 Switch(coníg-if)# switchport mode access Switch(coníg-if)# switchport access vlan 10 How to conígure trunk link? Switch(coníg)# interface fa0/24 Switch(coníg-if)# switchport trunk encapsulation <dot1q/isl> Switch(coníg-if)# switchport mode trunk How can we change Native Vlan? Switch(coníg)# interface fa0/0 Switch(coníg-if)# switchport trunk native vlan 100 Networker Interview

Which command is used to see trunk interfaces?

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Switch# show interface trunk

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Which command is used to see all VLANs information? Switch# show vlan  

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  VLAN.

  Cisco access port 8021q vlan tagging trunk port isl dot1q native vlan intervlan routing frame tagging vlan router on stick switch virtual interface

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