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About Virtual LANs

Virtual LANs enable network managers to group users logically rather than by physical location. A virtual LAN (VLAN) is an emulation of a standard LAN that allows data transfer and communication to occur without the traditional restraints placed on the network. It can also be considered a broadcast domain set up within a switch. With VLANs, switches can support more than one subnet (or VLAN) on each switch, and give routers and switches the opportunity to support multiple subnets on a single physical link. A group of devices that belong to the same VLAN, but are part of different LAN segments, are configured to communicate as if they were part of the same LAN segment. Layer 3 switching supports up to 244 VLAN subinterfaces per system.

VLANs enable efficient traffic separation and provide excellent bandwidth utilization. VLANs also alleviate scaling issues by logically segmenting the physical LAN structure into different subnetworks so that packets are switched only between ports within the same VLAN. This can be very useful for security, broadcast containment, and accounting.

Layer 3 switching software supports a port-based VLAN on a trunk port, which is a port that carries the traffic of multiple VLANs. Each frame transmitted on a trunk link is tagged as belonging to only one VLAN.

Layer 3 switching software supports VLAN frame encapsulation through the Inter-Switch Link (ISL) protocol and the 802.1Q standard on both the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers.

Figure 5-1 shows a network topology where two VLANs span a Catalyst 5500 switch and a Catalyst 2948G-L3 switch router. Both VLANs in this topology are bridged using the Inter-Switch Link (ISL) protocol.

Figure 5-1 VLANs Spanning Devices in a Network

Note Four adjacent Fast Ethernet ports on the Catalyst 2948G-L3 (such as Fast Ethernet 1 through 4 or Fast Ethernet 45 through 48) must all use the same VLAN encapsulation; that is, either ISL or 802.1Q.

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How can I configure e-mail and message security in Exchange Server 2003?

Exchange Server 2003 can work hand-in-hand with the Windows Server 2003 Certificate Authority (also known as CA) to provide message security by offering support for digital signatures and message encryption. Both forms of security will be discussed in a separate article, but what is important to us is the fact that both require the presence of a Digital Certificate to be issued for any user how will need to use these features.

In order to offer message security with Exchange Server 2003 you will first need to install and configure a CA in your domain.

Note: There may be scenarios where a company might opt to use 3rd party issued Digital Certificates instead of creating their own, especially when that company's users will be dealing with out-of-the-company users, exchanging encrypted e-mail messages between themselves and these outside users. This is because the outside users might not be willing to trust the company's internal CA.

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