Transcript
VIRTUAL PRIVATE NETWORKS (VPN)
Name = Aviansh nath B.tech – 2 year ( I T )
Traditional Connectivity
1. Virtual Private Network is a type of private network that uses public telecommunication, such as the Internet, instead of leased lines to communicate.
2. Became popular as more employees worked in remote locations.
3. Terminologies to understand how VPNs work.
What is VPN?
Who uses VPN ? VPN’s can be found in homes, workplaces, or
anywhere else as long as an ISP (Internet Service Provider) is available.
VPN’s allow company employees who travel often or who are outside their company headquarters to safely and securely connect to their company’s Intranet
Private Networks vs.
Virtual Private Networks1. Employees can access the network (Intranet)
from remote locations.
2. Secured networks.
3. The Internet is used as the backbone for VPNs
4. Saves cost tremendously from reduction of equipment and maintenance costs.
5. Scalability
Remote Access Virtual Private Network
1. Two connections – one is made to the Internet and the second is made to the VPN.
2. Datagrams – contains data, destination and source information.
3. Firewalls – VPNs allow authorized users to pass through the firewalls.
4. Protocols – protocols create the VPN tunnels.
Brief Overview of How it Works
1. Authentication – validates that the data was sent from the sender.
2. Access control – limiting unauthorized users from accessing the network.
3. Confidentiality – preventing the data to be read or copied as the data is being transported.
4. Data Integrity – ensuring that the data has not been altered
Four Critical Functions
Encryption Encryption -- is a method of “scrambling” data before transmitting it onto the Internet.
Public Key Encryption Technique
Digital signature – for authentication
Tunneling A virtual point-to-point connectionmade through a public network. It transportsencapsulated datagrams.
Two types of end points: Remote Access Site-to-Site
In information technology, a protocol is the special set of rules that end points in a telecommunication connection use when they communicate. Protocols specify interactions between the communicating entities.Protocols exist at several levels in a telecommunication connection. For example, there are protocols for the data interchange at the hardware device level and protocols for data interchange at the application program level.
What is protocol ?
The TCP/IP Internet protocols, a common example, consist of:
• Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level
• Internet Protocol (IP), which uses a set of rules to send and receive messages at the Internet address level
• Additional protocols that include the Hypertext Transfer Protocol (HTTP) and File Transfer Protocol (FTP), each with defined sets of rules to use with corresponding programs elsewhere on the Internet
Four Protocols used in VPNPPTP -- Point-to-Point Tunneling Protocol
L2TP -- Layer 2 Tunneling Protocol
IPsec -- Internet Protocol Security
SOCKS – is not used as much as the ones above
VPN Encapsulation of Packets
Types of Implementations
What does “implementation” mean in VPNs?
3 typesIntranet – Within an organizationExtranet – Outside an organizationRemote Access – Employee to Business
Device Types• What it means
• 3 types• Hardware• Firewall• Software
Device Types: Hardware• Usually a VPN type of router
Pros• Highest network throughput• Plug and Play • Dual-purpose
Cons• Cost• Lack of flexibility
Device Types: Firewall• More security.
Pros• “Harden” Operating System• Tri-purpose• Cost-effective
Cons• Still relatively costly
Device Types: Software• Ideal for 2 end points not in same org.• Great when different firewalls implemented
Pros• Flexible• Low relative cost
Cons• Lack of efficiency• More labor training required• Lower productivity; higher labor costs
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