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5/28/2017 VLAN Interview Questions and Answers | Networker Interview

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VLAN Interview Questions and Answers Search
What is a VLAN and how it will reduce the broadcast tra?c?
A VLAN is a logical grouping of network users and resources connected to administratively deíned ports
on a switch. VLAN divides the Broadcast Domain So, the frames that will be broadcasted onto the network
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are only switched between the ports logically grouped within the same VLAN.
Questions & Answers PDF
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 membership 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 supports 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       Click for Preview
Frame belongs to.
There are mainly two types of Frame Tagging Method:-
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1.Inter-Switch Link (ISL)
2.802.1Q Interview Questions and

These are also known as Frame Encapsulation Protocols. Answers Pdf ­ 3 $

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

What is a Native VLAN and What type of tra?c will go through Native VLAN? Click for Preview

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 Networker Interview

What is Inter-Vlan Routing? Like Page Share

VLANs divide broadcast domains in a LAN environment So, by default only Hosts that are members of the
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same VLAN can communicate. Whenever hosts in one VLAN need to communicate with hosts in another
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? 1/3

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