http://www.hub4tech.com/blog/top-vpn-interview-questions-and-answers-you-must-prepare

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Top VPN Interview Questions and Answers You Must
Prepare

• Hub4Tech

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Question 1 What is Trusted and Untrusted
Networks?

• Answer
• Trusted networks Such Networks allow data to be
  transferred transparently. The machines using a
  trusted network are usually administered by an
  Administrator to ensure that private and secured
  data is not leaked. Access to this network is
  limited. Computers using trusted networks are
  more secured and confidential because of strong
  firewalls.Untrusted networks Such networks are
  usually administered by the owners. They can
  allow improper access to sensitive or personal
  data. These machines are usually separate. Such
  machines could me more prone to attacks.

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Question 2 Is there market penetration for these
products?

• Answer
• Those companies who were early adopters of
  firewalls are the ones using VPNs today. VPNs are
  still early in the use cycle. Three years ago,
  they hardly existed. Then firewall products
  started to include them first ANS Interlock,
  then TIS Gauntlet. Soon, customers started
  demanding VPN functionality in their firewalls,
  even though few of them actually used it. But the
  Security Architecture for Internet Protocol
  (IPSEC) standard is changing that with
  IPSEC-compliant off-the-shelf products, using
  encryption to protect the privacy of
  communications will be an automatic decision. It
  may take awhile. I predicted that 1998 would be
  the "Year of the VPN," but maybe 1999 is more
  realistic. Look, over four years after the famous
  Internet password sniffing incident, most people
  still seem to be working with reusable passwords.

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Question 3What are the different authentication
methods used in VPNs?

• Answer
• The authentication method uses an authentication
  protocol. The methods areEAP authentication
  method Extensible authentication protocol
  authenticates remote access connection. The
  authentication mechanism is decided between the
  remote VPN client and authenticator (ISA). The
  mechanism is typical in which authenticator
  requests for authentication information and the
  responses are given by the remote VPN client.

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Question 4 What is VPN?

• Answer
•  A VPN is a service that offers secure, reliable
  connectivity over a shared public network
  infrastructure such as the Internet. VPNs
  maintain the same security and management
  policies as a private network. They are the most
  cost effective method of establishing a virtual
  point-to-point connection between remote users
  and an enterprise customer's network.

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Question 5 Is VPN a long-term solution or a
short-term stop gap kind of thing?

• Answer
• VPNs are long-term solutions. VPNs may become
  ubiquitous and transparent to the user, but they
  will not go away. Because the problem VPNs
  address privacy over a public network will
  not go away. VPNs will exist from the desktop to
  the server, and at the IP packet level as well as
  the application data level.

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Question 6What are the different types of VPN?

• AnswerRemote Access VPN - Also called as Virtual
  Private dial-up network (VPDN) is mainly used in
  scenarios where remote access to a network
  becomes essential. Remote access VPN allows data
  to be accessed between a companys private
  network and remote users through a third party
  service provider Enterprise service provider.
  E.g Sales team is usually present over the globe.
  Using Remote access VPN, the sales updates can be
  made.
• Site to Site VPN Intranet based This type of
  VPN can be used when multiple Remote locations
  are present and can be made to join to a single
  network. Machines present on these remote
  locations work as if they are working on a single
  network.
• Site to Site VPN Extranet based This type of
  VPN can be used when several different companies
  need to work in a shared environment. E.g.
  Distributors and service companies. This network
  is more manageable and reliable.

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Question 7 Who are the major players in the
market?

• Answer
• Aventail is a leader in this market. All the
  major firewall vendors and router vendors are in
  it as well. On the client side, Timestep and
  V-ONE are big.

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Question 8What kind of performance issues does
VPN raise?

• Answer
• Encryption takes more horsepower than sending
  data in the clear. It really shows up on mobile
  PCs transmitting large hunks of data for
  example, a PowerPoint presentation over a
  dial-up phone line. Firewalls and other server
  systems should employ hardware crypto engines.
  With these there are no performance issues. I
  expect that this functionality for mobile PCs
  will migrate to PC cards with crypto engines.
  When will this happen? Within the next 18 months.

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