networks and vpn
DESCRIPTION
Computer Networks and how it relates to Internet SecurityTRANSCRIPT
Networks and VPN
Computer Networks and how it relates to Internet Security
Purpose
The purpose of this presentation is to talk about Virtual Private Networks (VPN) from the perspective of security.
Topics Covered: Computer Networks IP Addressing Traffic Routing Security
Networking Terms
Network Switch Connects multiple
computers on network Router
Connects a network to the Internet
Contains a list of its known addresses
Protects its own network from the outside
Ethernet cable Connects a computer
to a network WIFI
A wireless connection to a network
Computer Network
A computer network is a collection of computers that are connected and are communicating.
They generally communicate through a communication device called a network switch, or switch for short.
Network Types
Computer networks come in various types, shapes, and sizes. We’ll talk about the following:
• LAN - Local Area Network• WAN - Wide Area Network• VPN - Virtual Private
network
Local Area Networks
A LAN is a network that is limited to a specific geographical location. Used in a home,
smaller school, or smaller business.
The computers will likely be connected using Ethernet cables or though WIFI.
Wide Area Networks
A WAN is a collection of LANs that are interconnected, or simply, a network of LANs.
A WAN is useful for: Splitting larger
networks Joining together
networks in different geographical locations.
Communication
So, how do these computers communicate?
In order for computers to communicate with each other, they need to have an addressing scheme.
Networks use Internet Protocol addresses(IP addresses).
IP Addresses
An IP address is a numeric number assigned to a device. Each IP address on a particular network is unique.
The IP address tells the networking equipment the device’s location on the network.
Think of it like your house address:
Your street and house number identify your location. However, they may not be unique, but they are unique within your zip code.
Public and Private IP Addresses
An IP address may be public or private.
Public and Private IP Addresses
Think about it like a university mail system.
Public and Private IP Addresses
The student’s mailbox at the university is private and only has meaning to the university.
Public and Private IP Addresses
The university’s address is public and known by the post office.
Public and Private IP Addresses
The post office only knows to deliver the mail to the university.
Public and Private IP Addresses
The university then has the information to know which student’s box the mail goes in.
Routers
Routers direct or route the internet traffic.
When a router receives data with a destination IP address, it knows where to send it.
Routers come in all shapes and sizes and are built for different purposes.
Home router
Commercial router
Routing
The university post office acts like a router: It determines if the
sending student’s mail should go to another student, or if it should go to the public post office to be delivered elsewhere.
When it receives mail from the public post office, it determines what to do with it.
If the student’s mailbox exists, it is delivered. If the student’s mailbox does not exist, the mail is discarded or returned.
Security
Now that you understand how networks operate, let’s talk a bit about security.
Unsecure WAN
Typically, most data across the internet is open and can be intercepted and then downloaded.
For example, if the Field Support Office downloads a document from the Corporate Office, someone could intercept the same document as it is being downloaded.
A VPN can prevent this scenario!
Virtual Private Network
A VPN extends a LAN to a remote user using a public network, such as the internet.
This is possible by creating a secure tunnel from the user to a VPN Server on another network.
Even though the user is physically in a different location, the VPN connection makes it look like the user is physically connected to that LAN.
A WAN using VPN
A VPN creates a tunnel through the Internet.
The data exchange between the office networks are all encrypted.
Each office can now access the data in the other offices as if they were on the same network.
Why use a VPN? Securely access files on a remote LAN with
ease
Cost Effective
Location hiding
VPN – Location Hiding
Tom recently moved to Turkey
Tom needs YouTube for a school assignment
…but, Turkey blocks YouTube
VPN – Location Hiding
Tom has an idea!
Tom connects to his school’s network in the USA via VPN
VPN – Location Hiding
Bingo! He can know access YouTube.
Why? The VPN allowed him to view YouTube as if he was physically connected at his school.
Resources http://www.ehow.com/about_4671848_what-is-vpn.html http://www.ciaograzie.it/listing/poli/tsr/VPN_E_A.pdf http://en.wikipedia.org/wiki/Routing_table http://en.wikipedia.org/wiki/Router http://compnetworking.about.com/od/workingwithipaddresses/a/
subnetmask.htm http://en.wikipedia.org/wiki/IP_address http://en.wikipedia.org/wiki/Computer_network http://en.wikipedia.org/wiki/Virtual_private_network
Image References Gnome Network: http://commons.wikimedia.org/wiki/File:Gnome-
preferences-system-network.svg School IP: http://commons.wikimedia.org/wiki/File:School_ip.svg Router: http://commons.wikimedia.org/wiki/File:Router.svg File Lock: http://commons.wikimedia.org/wiki/File:Lock_icon.png VPN Tunnel: http://commons.wikimedia.org/wiki/File:VPN_remote.jpg RJ45 Jack: http://commons.wikimedia.org/wiki/File:Network-wired.svg LAN Network: http://commons.wikimedia.org/wiki/File:Server-based-
network.svg LAN/WAN Network:
http://commons.wikimedia.org/wiki/File:Gateway_firewall.svg House Number: House Number:
http://commons.wikimedia.org/wiki/File:House_numbering_of_National_Quantum_Information_Centre_of_Gda%C5%84sk.jpg
Image References cont. Mailboxes:
http://commons.wikimedia.org/wiki/File:JMU_student_mailboxes.jpg D-Link Router: http://commons.wikimedia.org/wiki/File:D-Link_DI-524.jpg Cisco Router:
http://commons.wikimedia.org/wiki/File:Cisco_7603_Chassis.png Letter:
http://office.microsoft.com/en-us/images/similar.aspx#ai:MC900127677| Paddle lock: http://commons.wikimedia.org/wiki/File:Abus_Lock.jpg Private sign:
http://commons.wikimedia.org/wiki/File:GWMNM_private_property_sign.jpg Public sign:
http://upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Public_footpath_sign%2C_Alvechurch.JPG/512px-Public_footpath_sign%2C_Alvechurch.JPG
Mail truck: http://commons.wikimedia.org/wiki/File:USPS-Mail-Truck.jpg
Image References cont. Cardiff University:
http://commons.wikimedia.org/wiki/File:Cardiff_University.JPG Tunnel: http://commons.wikimedia.org/wiki/File:Tunnel_42m.jpg Turkey Map:
http://commons.wikimedia.org/wiki/File:Turkey_map_blank.png YouTube: http://commons.wikimedia.org/wiki/File:Youtube.svg No Sign: http://commons.wikimedia.org/wiki/File:No_sign.svg