What is a VPN?
Cisco Documentation on VPN
• A VPN is a Virtual Private Network
• Now, as more and more companies need access for remote users, mobile
users or remote offices, your current architecture can be augmented with a
• A Virtual Private Network is a network that’s created by encryption
(Tunneling) across another unsecured medium, like the Internet
• What is great about Cisco and VPN’s is that all Cisco devices can be
configured as a VPN enabled device solely by the IOS feature set itself. There
is a concentrator series, but...
In an age when our society relies so heavily on electronic communication, the need
for information security is imperative. Given the value and confidential nature of the
information that exists on today’s networks, CIOs are finding that an investment in
security is not only extremely beneficial but also absolutely necessary. Corporations
are realizing the need to create and enforce an information security policy.
This module explains to students how to strengthen the security of their Web
applications by incorporating the programmatic use of cryptography.
Depending on the programming platform, students will use one of several
cryptographic libraries to add encryption, hashing, and digital signing
functionality to their Web application. After completing this module, students
will be able to use the CAPICOM cryptographic library and the
System.Security.Cryptography namespace to encrypt, hash, and sign data....
The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it….An open security model is the easiest to implement .
Simple passwords and server security become the foundation of this model.
If encryption is used, it is implemented by individual users or on servers.
Clusters define a collection of servers that operate as if they were a single machine. The primary purpose
of high availability (HA) clusters is to provide uninterrupted access to data, even if a server loses
network or storage connectivity, or fails completely, or if the application running on the server fails.
HA clusters are mainly used for e-mail and database servers, and for file sharing. In their most basic
implementation, HA clusters consist of two server machines (referred to as “nodes”) that “share”
1.Connect devices that are separated by a broader geographical area.
2.Use the services of carriers, such as telephone companies, network providers…
3.Use serial connections.A VPN is an encrypted connection between private networks over a public network such as the Internet. Instead of using a dedicated Layer 2 connection such as a leased line, a VPN uses virtual connections called VPN tunnels, which are routed through the Internet from the private network of the company to the remote site or employee host.
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IPSec—IP Security Protocol. IPSec is a framework of open standards that provides data
confidentiality, data integrity, and data authentication between participating peers. IPSec provides
these security services at the IP layer; it uses IKE to handle negotiation of protocols and algorithms
based on local policy and to generate the encryption and authentication keys to be used by IPSec.
IPSec can be used to protect one or more data flows between a pair of hosts, between a pair of
security gateways, or between a security gateway and a host....
Companies must protect conﬁdential information from eavesdropping or tampering during transmission. By implementing
Virtual Private Networks (VPNs) enterprises can establish private, secure communications across a public network—usually
the Internet—and extend their corporate networks to remote ofﬁces, mobile users, telecommuters, and extranet partners.