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How Dial-Up Network Access Works
Dial-up clients make a temporary connection to
a
remote
access
server
by
using
a
telecommunications provider Remote Access Server
Domain Controller
Dial-up Client
1
Dial-up Dial-up client client calls calls the the RA RA server server
3
RA RA server server authenticates authenticates and authorizes authorizes the the client
2
RA RA server answers answers the the call call
4
RA server server transfers transfers data data
2
Components of a Dial-Up Connection
Remote Remote Access Access Server Server
Domain Controller
LAN LAN and and Remote Remote Access Access Protocols Protocols
WAN WAN Options: Options: Telephone, Telephone, ISDN, ISDN, X.25, X.25, or ATM ATM
Dial-Up Dial-Up Client Client
Authentication Authentication DHCP Server
Address Address and and Name Name Server Allocation Allocation
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How a VPN Connection Works
A VPN extends a private network across shared or public networks, such
as the
Internet VPN Server Domain Controller VPN Client
1
VPN client client calls calls the the VPN server server
3
VPN VPN server server authenticates authenticates and authorizes authorizes the client client
2
VPN server server answers answers the the call call
4
VPN server server transfers transfers data data
4
Components of a VPN Connection
VPN VPN Server Server
Domain Controller
VPN VPN Tunnel Tunnel Tunneling Protocols Protocols Tunneled Tunneled Data Data
VPN Client Client Authentication Authentication DHCP Server
Transit Transit Network Network
Address Address and and Name Name Server Server Allocation Allocation
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Standard Authentication Protocols
Protocol
Security
Use when A client & server cannot negotiate using more secure validation
PAP
Low
SPAP
Medium
CHAP
High
You have clients not running Microsoft operating systems
MS-CHAP
High
You have clients running Windows NT Workstation 4.0 or later, or Microsoft Windows 95 or later
MS-CHAP v2 High
You have dial-up clients running Windows 2000 or later, or VPN clients running Windows NT 4.0 or Windows 98 or later
A Shiva client calls in to a server running Windows, or a Windows XP client calls in to a Shiva server
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