INTERVIEW QUESTIONS NETWORKING LAN NETWORK DETAILS

Question: how to create vlan

Answer: VLAN is technology in which we can administratively assign different ports of same layer to switch to different subnetworks.

VLAN is technology in which we can administratively assign different ports of same layer to switch to different subnetworks. Source: CoolInterview.com

WLAN..
wireless local area network Source: CoolInterview.com

a VLAN is a broadcast domain created by switches. Normally, it is a router creating that broadcast domain. With VLAN’s, a switch can create the broadcast domain.

This works by, you, the administrator, putting some switch ports in a VLAN other than 1, the default VLAN. All ports in a single VLAN are in a single broadcast domain.

Because switches can talk to each other, some ports on switch A can be in VLAN 10 and other ports on switch B can be in VLAN 10. Broadcasts between these devices will not be seen on any other port in any other VLAN, other than 10. However, these devices can all communicate because they are on the same VLAN. Without additional configuration, they would not be able to communicate with any other devices, not in their VLAN. Source: CoolInterview.com

vLAN is nothing but virtual LAN in which the network is created at the time where both sender and receiver accept to connect and after that it will be disconnected for security. Its like VPN(Virtual Private Network) Source: CoolInterview.com

virtual lan
switch is a single broadcasting domain and if we have 2 creat differnt networks in switch to avoid unneceessary broadcaste than we can create virtual lan .
and routing packet between diffrent vlan we need router. Source: CoolInterview.com

VLANs are created on Layer 2 switches to control broadcasts and enforce the use of a Layer 3 device for communications. Each VLAN is created in the local switch's database for use. If a VLAN is not known to a switch, that switch cannot transfer traffic across any of its ports for that VLAN. VLANs are created by number, and there are two ranges of usable VLAN numbers (normal range 1-1000 and extended range 1025-4096). When a VLAN is created, you can also give it certain attributes such as a VLAN name, VLAN type, and its operational state. To create a VLAN, use the following steps.
1) Configure VTP. VTP is a protocol used by Cisco switches to maintain a consistent database between switches for trunking purposes. VTP is not required to create VLANs; however, Cisco has set it up to act as a conduit for VLAN configuration between switches as a default to make administration of VLANs easier. Because of this, you must first either configure VTP with a domain name or disable VTP on the switch.
2) Create the VLAN. VLANs are created by number. The two ranges of VLANs are as follows: The standard range consists of VLANs 1 to 1000. The extended range consists of VLANs 1025 to 4096. Extended VLANs are currently supported only on switches running COS software version 6.1 or greater. When you create a VLAN, you have many options to consider. Many options are valid only for FDDI and Token Ring VLANs. Some of the items configured deal with options, such as private VLANs, which are discussed in other sections in this book. VLANs are created using the set vlan command for COS devices or with the vlan command in vlan database mode for IOS switches.
Source: CoolInterview.com

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