CIS 505 Week 7 Discussions STR
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CIS 505 Week 7 Discussions STR
CIS 505 Week 7 Discussion 1
The Advantages of VPNs for an organization
include cost savings and network scalability. A VPN can save organizations
money in several situations: eliminating the need for expensive long-distance
leased lines, reducing long-distance telephone charges, & offloading
support costs. The cost to an organization of building a dedicated private
network may be reasonable at first but increases exponentially as the
organization grows. Internet based VPNs avoid this scalability problem by
simply tapping into the public lines and network capability readily
available& offers superior reach and quality of service.
From the e-Activity, compare three VPN services available
to organizations to determine the primary differences among each. Discuss the
pros and cons of each VPN service and suggest the type of organization that
would best fit each network provider.
PPTP VPN – This
is the most common and widely used VPN protocol. They enable authorized remote
users to connect to the VPN network using their existing Internet connection
and then log on to the VPN using password authentication. They don’t need extra
hardware and the features are often available as inexpensive add-on software.
PPTP stands for Point-to-Point Tunneling Protocol. The disadvantage of PPTP is
that it does not provide encryption and it relies on the PPP (Point-to-Point
Protocol) to implement security measures.
SSL – SSL
or Secure Socket Layer is a VPN accessible via https over web browser. SSL creates
a secure session from your PC browser to the application server you’re
accessing. The major advantage of SSL is that it doesn’t need any software
installed because it uses the web browser as the client application. A
disadvantages is its optional (as opposed to in-built) user authentication.
This is a major security weakness. Also, SSL tunneling (basically mimics IPSec)
is not supported on Linux or non-Windows OS.
MPLS VPN – MPLS
(Multi-Protocol Label Switching) are no good for remote access for individual
users, but for site-to-site connectivity, they’re the most flexible and
scalable option. These systems are essentially ISP-tuned VPNs, where two or
more sites are connected to form a VPN using the same ISP. An MPLS network
isn’t as easy to set up or add to as the others, and hence bound to be more
expensive.
For individual users, PP2P VPNs offer the
best deal, but for large offices or ones with complex requirements for
connectivity MPLS VPNs might be the best option.
http://techpp.com/2010/07/16/different-types-of-vpn-protocols/ http://www.addictivetips.com/windows-tips/what-is-vpn-how-to-create-and-connect-to-vpn-network/
CIS 505 Week 7 Discussion 2
Frame relay is a
packet switching technology for connecting network points in Wide Area Networks
(WAN). It is a connection oriented data service and establishes a virtual
circuit between two end points. Data transfer is done in packets of data known
as frames. These frames are variable in packet size and more efficient due to
flexible transfers. Frame Relay was originally introduced for ISDN interfaces
though it is currently used over a variety of other network interfaces as well.
ATM is a
network switching technology that uses a cell based methodology to quantize
data. ATM data communication consists of fixed size cells of 53 bytes. An ATM
cell contains a 5byte header and 48 bytes of ATM payload. This smaller size,
fixed-length cells are good for transmitting voice, image and video data as the
delay is minimized. ATM is a connection oriented protocol and therefore a
virtual circuit should be established between sending and receiving points. It
establishes a fixed route between two points when the data transfer starts.
Another important aspect of ATM is its asynchronous operation in time division
multiplexing. ATM provides a good quality of service in networks where
different types of information such as data, voice, and are supported. With
ATM, each of these information types can pass through a single network
connection.
Advantages & Disadvantages
Although ATM uses fixed size packets (53 bytes)
for data communication, frame relay uses variable packet sizes depending on the
type of information to be sent. Both information blocks have a header in
addition to data block and transfer is connection oriented. Frame Relay is used
to connect Local Area Networks (LAN) and it is not implemented within a single
area network contrast to ATM where data transfers are within a single LAN. ATM
is designed to be convenient for hardware implementation and therefore, cost is
higher compared to frame relay, which is software controlled. Therefore, frame
relay is less expensive and upgrading is easier. Frame relay has a variable
packet size. Therefore, it gives low overhead within the packet which results
it an efficient method for transmitting data. Although fixed packet size in
ATM, can be useful for handling video and image traffic at high speeds, it
leaves a lot of overhead within the packet, particularly in short transactions.
Suppose you are in charge of selecting ATM or frame relay
as a WAN alternative for your technological needs of a communication technology
organization. Choose one of the WAN alternatives and justify your decision.
A WAN alternative I would choose for my technological
needs of a communication technology organization would be Frame Relay. Frame
Relay networking services deliver a permanent virtual circuit (PVC), which
means that customers benefit from what looks like a continuous, dedicated
connection, without having to pay for a full-time leased line. At a service
provider level, the route which each frame travels to its destination is
allocated dynamically and can be charged based on actual usage. It’s a proven
technology, resilient, is more cost effective than leased lines, and is more
scalable than a network of private circuits.
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