This term paper involves designing a secure network to support email, file transfer, and VPN services, requiring detailed diagrams and explanations of the network infrastructure. The assignment includes creating overall network and datapath diagrams using tools like Microsoft Visio, and documenting scenarios for internal users sending emails, transferring files via FTP, and remote users connecting through VPN. Emphasis is placed on security measures, device configurations, and ensuring the network operates efficiently despite potential vulnerabilities.

1. This term paper involves putting together the various concepts
learned throughout this course. You are tasked with designing
the most secure network possible, keeping in mind your goal of
supporting three (3) IT services: email, file transfer
(centralized), and VPN. Your first step is to design a single
network capable of supporting three (3) different services. Once
you have fully designed your network, you will need to provide
three (3) workflow diagrams explaining how your designed
network handles the three (3) different transactions. The first is
an internal user sending an email using his / her corporate email
address to a user on the Yahoo domain with an arbitrary address
of
[email protected]
The second workflow diagram should show a user initiating an
FTP session from inside your network to the arbitrary site of
ftp.netneering.com. The third workflow is an externally located
employee initiating a VPN session to corporate in order to
access files on the Windows desktop computer, DT-Corp534-
HellenS, at work.
Write a paper in which you complete the following three (3)
parts.
Note:
Please use the following breakdown to complete your
assignment:
· Overall network diagram
· Datapath diagrams
(one for each of the steps in the scenarios below)
· Write-up

2. Part 1
1a. Using Microsoft Visio or its open source alternative, create
a diagram showing the overall network you’ve designed, from
the user or endpoint device to the Internet cloud, and everything
in between, in which you:
i. Follow the access, core, distribution layer model.
ii. Include at a minimum:
· Authentication server (i.e. Microsoft Active Directory)
· Routers
· Switches (and / or hubs)
· Local users
· Remote users
· Workstations
· Files share (i.e. CIFS)
· Mail server
· Web servers (both internal and external)
· Firewalls
· Internet cloud
· Web proxy
· Email proxy

3. · FTP server (for internal-to-external transport)
1b. Explain each network device’s function and your specific
configuration of each networking device.
1c. Design and label the bandwidth availability or capacity for
each wired connection.
Part 2
2a. Using Microsoft Visio or its open source alternative, create
a Datapath Diagram for the following scenario:
Local user sends email to a Yahoo recipient. Local (corporate)
user having email address
[email protected]
sends an email to user53
[email protected]
i. Document and label the diagram showing protocols and path
of the data flow as data traverses through your network from
source to destination.
ii. Include path lines with arrows showing directions and layer
1, 2, 3, 4, 5, 6, and 7 (OSI) protocols that are used for each
flow.
iii. Show user authentication when necessary.
2b. Using Microsoft Visio or its open source alternative, create
a Datapath Diagram for the following scenario:
Local user, Jonny Hill, transfers file using ftp through the
Internet to another company’s site (ftp.netneering.com). He has

4. to access the secure shell using his active directory credentials
to authenticate to the ftp server (Linux running Redhat) on the
DMZ. He needs to transfer files from his desktop across the
Internet to
ftp.netneering.com.
i. Document and label the diagram showing protocols and path
of the data flow as data traverses through your network from
source to destination.
ii. Include path lines with arrows showing directions and layer
1, 2, 3, 4, 5, 6, and 7 (OSI) protocols that are used for each
flow.
iii. Show user authentication when necessary.
2c. Using Microsoft Visio or its open source alternative, create
a Datapath Diagram for the following scenario:
Remote user, Hellen Stover, connects via VPN from home
through the Internet to her corporate desktop, DT-Corp534-
HellenS. Hellen uses a browser to initiate her VPN connection.
By browsing to
https://VPNaccess.corp534.com
, she arrives at a login page where she needs to authenticate
using her Active Directory credentials before the VPN tunnel is
built.
i. Document and label the diagram showing protocols and path
of the data flow as data traverses through your network from
source to destination.
ii. Include path lines with arrows showing directions and layer
1, 2, 3, 4, 5, 6, and 7 (OSI) protocols that are used for each

5. flow.
iii. Show user authentication when necessary.
2d. Explain how your overall design protects the organization
from both inside and outside attacks. Give examples.
2e. Explain how your layered design compensates for possible
device failures or breaches in network security.
2f. Determine whether any possible bottlenecks exist in your
design.
2g. Explain how to make the file transfer process more secure.
Part 3
1. Use at least five (5) quality resources in this assignment.
Note:
Wikipedia and similar websites do not qualify as quality
resources.
2. Include charts or diagrams created in Visio or an equivalent
such as Dia. The completed diagrams / charts must be imported
into the Word document before the paper is submitted.