Types Of Vlan
There are different types of VLANs. The
type of network traffic they carry defines a particular type of VLAN and
others derive their names due to the type or a specific function the
VLAN performs. The following describes common VLAN:
Default VLAN
At the initial boot up of the switch, All
switch ports become a member of the default VLAN, which makes them all
part of the same broadcast domain. This allows any network device
connected to any of the switch port to communicate with other devices on
other switch ports.
On Cisco switches the default VLAN is
VLAN 1. VLAN 1 has all the features of any VLAN, except that you cannot
rename or delete it.
Data VLAN
A data VLAN that can also be referred to
as user VLAN. This is configured to carry only user-generated traffic.
The importance of separating user data from other type of VLAN is proper
switch management and control.
Native VLAN
A native VLAN is assigned to an 802.1Q
trunk port. An 802.1Q trunk port supports traffic coming from many VLANs
as well as traffic that do not come from a VLAN. The 802.1Q trunk port
places untagged traffic (traffic that does not come from a VLAN) on the
native VLAN. In summary, the native VLAN observes and identifies traffic
coming from each end of a trunk link.
Management VLAN
A management VLAN is any VLAN you
configure to access the management capabilities of a switch. Your
configured management VLAN is to be assign with an IP address and
subnet mask. Any of a switch VLAN could be configured as the management
VLAN if you has not configured or define a unique VLAN to serve as the
management VLAN. In some cases, a network administrator proactively
defines VLAN 1 as the management VLAN; this enables a loophole for an
unauthorized connection to a switch.
Voice VLAN
Voice VLAN is configured to carry voice
traffic. Voice VLANs are mostly given transmission priority over other
types of network traffic. Communication over the network is not complete
without phone calls. More calls are made over the network than other
forms of s message transmission. Sending emails and text messages are
also forms of inter-relations but listening to a real voice provides
legitimacy and assurance.
It is considered among network
administrators to design a network that support VoIP with an assured
bandwidth to ensure voice quality, and capability to be routed around
congested areas on the network with minimal delays (150-180
milliseconds).
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