VPN Client
A VPN client TS connects to a network using the Internet or public network as its backbone.
It uses Transmission Control Protocol/Internet Protocol (TCP/IP ) protocols and
tunneling, covered later in this lesson, as a means of securing and encrypting the data
as it traverses the public network.
Wireless Client
Wireless clients connect to a network by using radio frequencies ranging from 2.4 GHz
to 5.0 GHz, depending on which 802.11 70-649 wireless standard is being followed (see Table
10-2 for some of the wireless standards). Infrared (IR) frequencies use the frequency a
little below visible light and spread-spectrum signals to send data over multiple frequencies.
Bluetooth is another popular wireless standard for smaller, short-distance
devices such as Personal Digital Assistants (PDAs), and is supported on Microsoft
Windows XP service pack 1 and later.For a wireless client to connect to a remote access server, a couple of components are
required:
■ Wireless network interface card (NIC) on the client computer The wireless
NIC translates the workstation’s digital signals into radio signals that are sent to a
transceiver located in the same area as the wireless client workstation. There can
be multiple transceivers spread MCSA over a large area, if necessary, as discussed in
Lesson 2.
■ Access point (AP) The access point is the transceiver that receives signals from
the wireless client. The AP is connected to the local area network (LAN) segment,
which subsequently sends the data it receives from the wireless client to the
remote access server.
In designing your wireless network, you must determine where to locate the wireless
APs based on the location of your wireless users. You should create a network diagram
that shows the locations within a building that require wireless coverage, or you can
enable wireless coverage for an entire building. You should also document any devices
that can interfere with your wireless network, such as: 70-297
How Many APs Do I Need?
So far, you have included fault tolerance and redundancy in your network design.
Wireless networking should be no exception. Having only one access point in your
wireless design is not only risky, it will also have an adverse affect if a wireless remote
client is not located close enough to the receiver. The indoor range of most devices is
about a 150-foot radius.
You should have an idea of how many wireless clients will be accessing your network.
In your design phase you should try to estimate the throughput the average wireless
client will use. You can multiply this number by the total number of users and get a
good idea of the wireless bandwidth requirement you will need. This will help you
determine the total number of APs for your 70-646 remote access infrastructure. If there are
too many users accessing an AP, the effective data transmission rate will be lower and
the available bandwidth for each user will be reduced.