RAS(Remote Access Services)

1- Domain Controller

2-Dial-up Client

3- RA server authenticatesand authorizes the client RA server answers the call

4- RA server transfers

data

Dial-up client calls

1 the RA server

Remote Access

Server

How Dial-Up Network Access Works

􀂇 Dial-up clients make a temporary connection

to a remote access server by using a

telecommunications provider



Dial--Up Client

Address and Name Server Allocation DHCP

Server

Domain

Controller

Authentication

Remote Access

Server

WAN Options:

Telephone, ISDN,

X.25, or ATM

LAN and Remote Access

Protocols

Components of a Dial-Up Connection

4

How a VPN Connection Works

Domain

Controller

VPN Client

VPN Server

33 VPN server authenticates

and authorizes the client

22 VPN server

answers the call

44 VPN server transfers

data

VPN client calls the

11 VPN server

􀂇 A VPN extends a private network across

shared or public networks, such as the

Internet

5

VPN Tunnel

Tunneling Protocols

Tunneled Data

VPN Client

VPN Server

Address and Name Server Allocation

DHCP

Server

Domain

Controller

Authentication Transit NetworK
Components of a VPN Connection

A Shiva client calls in to a server

running Windows, or a Windows XP

client calls in to a Shiva server

SPAP Medium

You have dial-up clients running

Windows 2000 or later, or VPN clients

running Windows NT 4.0 or Windows

98 or later

MS-CHAP v2 High

You have clients running Windows NT

Workstation 4.0 or later, or Microsoft

Windows 95 or later

MS-CHAP High

You have clients not running Microsoft

CHAP High operating systems

A client & server cannot negotiate

using more secure validation

PAP Low

Protocol Security Use when

Standard Authentication Protocols