Client computers can connect to the VPN by dial-up, DSL, ISDN, or cable modems.Īn intranet is a local area network (LAN) add-on that is restricted to certain users, usually a company's employees. Once the information arrives at its destination, it is then decrypted.īy using a VPN, a company avoids the expense of leased lines for secure communication, but instead can use public networks to transfer data in a secure way. The information travels in an encrypted, or non-readable, form. Packets are encrypted from where they originate before they are sent via the Internet. Data being sent is encapsulated into what are called network packets. The term ""tunnel"" refers to how the information is privately sent. A common tunneling protocol for this purpose is Point-to-Point Tunneling Protocol (PPTP). VPNs use what is known as a tunneling protocol for the secure transfer of data using the Internet. Certificates are used to verify user identity and protect data communication. An extranet has a wider boundary than an intranet.Ī certificate server provides certificate services to users. It is not actually responsible for data transmission. While an extranet should be configured to provide the shared data, an extranet is only a Web page. If a small company purchases an all-in-one wireless router/switch and has two Web servers, and it needs to protect from access by BYOD, you could create a server VLAN and place an ACL on the Web servers.Īn extranet enables two or more companies to share information and resources. A VLAN is an excellent way to provide an added layer of security by isolating resources into separate subnets. A VPN transports encrypted data.Ī Virtual LAN (VLAN) allows networks to be segmented logically without physically rewiring the network. In a VPN, a public network, such as the Internet, is used to allow secure communication between companies that are not located together or between private networks. A virtual private network (VPN) is not a physical network.
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February 2023
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