What Is a Virtual LAN?
A VLAN is a switched network that is logically segmented on an organizational
basis, by functions, project teams, or applications rather than
on a physical or geographical basis. For example, all workstations and servers
used by a particular workgroup team can be connected to the
same VLAN, regardless of their physical connections to the network or the fact
that they might be intermingled with other teams.
Reconfiguration of the network can be done through software rather than by
physically unplugging and moving devices or wires.
A VLAN can be thought of as a broadcast domain that exists within a defined set
of switches. A VLAN consists of a number of end systems,
either hosts or network equipment (such as bridges and routers), connected by a
single bridging domain. The bridging domain is supported on
various pieces of network equipment; for example, LAN switches that operate
bridging protocols between them with a separate bridge group
for each VLAN.
VLANs are created to provide the segmentation services traditionally provided by
routers in LAN configurations. VLANs address scalability,
security, and network management. Routers in VLAN topologies provide broadcast
filtering, security, address summarization, and traffic flow
management. None of the switches within the defined group will bridge any
frames, not even broadcast frames, between two VLANs. Several
key issues need to be considered when designing and building switched LAN
internetworks.
See :
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/switc
h_c/xcvlan.htm
for more info.
Hope this helps
Marcus
______________________________ Reply Separator _________________________________
Subject: ENQUIRY
Author: 97ec090 ([EMAIL PROTECTED]) at unix,mime
Date: 27/9/99 22:26
I had asked all of you few months back through this list for advice on
acquiring more knowledge about firewalls and was really glad to get such a
lot of help.I want to trouble all of you again .Could anyone please tell
me about VLANs - what are they exactly and where can I find out more about
them (books , sites etc ) ?
Thanks in anticipation of your precious time and sorry for any
inconvinience caused.
warm regards,
yatindra mahajan.
-----------------------------------------------------------------------------
YATINDRA MAHAJAN,
BE-3rd YEAR, AG-5,HOSTEL NO.-5,
DEPT. OF ELECTRONICS, GANDHI BHAWAN,
REGIONAL COLLEGE OF ENGINEERING, SVRCET,
SURAT, SURAT,
GUJARAT, GUJARAT-395007,
INDIA. INDIA.
------------------------------------------------------------------------------
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
This message contains confidential information and is intended only
for the individual named. If you are not the named addressee you
should not disseminate, distribute or copy this e-mail. Please
notify the sender immediately by e-mail if you have received this
e-mail by mistake and delete this e-mail from your system.
E-mail transmission cannot be guaranteed to be secure or error-free
as information could be intercepted, corrupted, lost, destroyed,
arrive late or incomplete, or contain viruses. The sender therefore
does not accept liability for any errors or omissions in the contents
of this message which arise as a result of e-mail transmission. If
verification is required please request a hard-copy version. This
message is provided for informational purposes and should not be
construed as a solicitation or offer to buy or sell any securities or
related financial instruments.
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
