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#12. Infrastructure andConnectivity

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AGENDA

Understanding Infrastructure Security

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Virtual Private Networks

A virtual private network (VPN) is a private

network connection that occurs through a public

network. A private network provides security

over an otherwise unsecure environment. VPNscan be used to connect LANs together across

the Internet or other public networks. With a

VPN, the remote end appears to be connected

to the network as if it were connected locally. AVPN requires either special hardware to be

installed or a VPN software package running on

servers and workstations.

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Virtual Private Networks

VPNs typically use a tunneling protocol such as

Layer 2 Tunneling Protocol (L2TP), IPSec, or

Point-to-Point Tunneling Protocol (PPTP).

Figure 3.9 shows a remote network beingconnected to a LAN using the Internet and a

VPN. This connection appears to be a local

connection, and all message traffic and

protocols are available across the VPN.

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Virtual Private Networks

As mentioned earlier, VPNs are used to make

connections between private networks across a

public network, such as the Internet. These

connections arent guaranteed to be secureunless a tunneling protocol (such as PPTP) and

an encryption system (such as IPSec) are used.

A wide range of options, including proprietary

technologies, is available for VPN support.

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Virtual Private Networks

Many of the large ISPs and data

communications providers offer dedicated

hardware with VPN capabilities. Many servers

also provide software VPN capabilities for usebetween two networks.

VPN systems can be dedicated to a certain

protocol, or they can pass whatever protocols

they see on one end of the network to the otherend. A pure VPN connection appears as a

dedicated wired connection between the two

network ends.

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Wireless Access Points

It does not take much to build a wireless

network. On the client side, you need a wireless

network card (NIC) in place of the standard

wired NIC. On the network side, you needsomething to communicate with the clients.

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Wireless Access Points

The primary method of connecting a wireless

device to a network is via a wireless portal. A

wireless access point(WAP) is a low-power

transmitter/receiver, also known as atransceiver, which is strategically placed for

access. The portable device and the access

point communicate using one of several

communications protocols, including IEEE802.11 (also known as Wireless Ethernet).

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Wireless Access Points

Wireless communication methods are becoming

more prevalent in computing because the cost

of the transmitting and receiving equipment has

fallen drastically over the last few years.Wireless also offers mobile connectivity within a

campus, a building, or even a city. Most wireless

frequencies are shared frequencies in that more

than one person may be using the samefrequency for communication.

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Wireless Access Points

Wireless communication methods are becoming

more prevalent in computing because the cost

of the transmitting and receiving equipment has

fallen drastically over the last few years.Wireless also offers mobile connectivity within a

campus, a building, or even a city. Most wireless

frequencies are shared frequencies in that more

than one person may be using the samefrequency for communication.

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Wireless Access Points

Wireless communication methods are becoming

more prevalent in computing because the cost

of the transmitting and receiving equipment has

fallen drastically over the last few years.Wireless also offers mobile connectivity within a

campus, a building, or even a city. Most wireless

frequencies are shared frequencies in that more

than one person may be using the samefrequency for communication.