Remote Access: Dial-up, VPN, Authentication, Protocols, and Bandwidth Allocation, Essays (university) of Operating Systems

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HCL CDC Etawah

1. What is Remote Access Service (RAS) and its Types?
2. RAS Client Supported Connection Type
3. RAS Supporting Clients
4. Required RAS Server components
5. RAS Client supported Connection, Transport Authentication, VPN, and Bandwidth Protocols

Contents for Remote Access Service:

6. Working with RAS

Remote Access Service (RAS):

It is considered to be a WAN connection. It is built into Windows NT that enables Users to log into an

NT-based LAN using a Modem.

Remote Access Server Remote AccessServer

Type 1: Dial-up Remote Access A dial-up remote access connection comprises remote access clients, a remote access server (RAS), and some telecommunication infrastructure (typically, an analog phone line). A remote client uses the telecommunication infrastructure to create a temporary physical or virtual circuit to a port on the RAS. After the circuit is created, the connection parameters are set. If RAS and remote access clients are not located in a local telecommunication boundary, incremental long distance charges are incurred. Even though it has limited scalability, this solution is good for corporations that have a low requirement for remote access.

Type 2: VPN Remote Access A VPN remote access connection between a user and the enterprise data center consists of a VPN client, a VPN device or server, and the Internet. When a client accesses the Internet through a local ISP, a virtual point-to-point connection is created with a RAS acting as the VPN server. Once this connection is created, the parameters for the VPN connection can be set and a VPN tunnel established with the VPN device or server to access enterprise resources. In this case, the client is not required to dial long distance.

Public Switched Telephone Network

(PSTN):

Integrated Services Digital Network

(ISDN):

Asynchronous Transfer Mode (ATM)

over Asymmetric Digital Subscriber

Line (ADSL)

Digital Links and V.90:

RAS Supporting Clients:

1. TCP/IP Clients using PPP

2. LAN Manager

3. DOS RAS

4. Windows for Workgroups

5. Windows 95/

6.Windows NT 3.1 and above

7. Windows 2000/Xp

Required RAS Server Components:

1. Modem

or

2. ISDN Interface

or

3. X.25 PAD 4. ATM

Routing And Remote Access Server

(RRAS):

RAS Supported Connection

Protocols:

1. Point to Point Protocol (PPP)

2. Serial Line Internet Protocol (SLIP)

3. Compressed SLIP (CSLIP)

4. Point to Point Multilink Protocol (PPMP)

5. Microsoft RAS or AsyBEUI

6. Callback Control Protocol (CBCP)

Serial Line Internet Protocol (SLIP):

The Serial Line Internet Protocol is an encapsulation of the Internet Protocol designed to work over Serial Ports and Modem Connections. SLIP has been largely replaced by the Point to Point Protocol. SLIP will only support transport of IP Packets.

Compressed SLIP (CSLIP):

CSLIP is essentially for data compression of the SLIP Protocol. It reduce packet overhead drastically. It requires CSLIP support on both the Client and Server ends. This may also be used with PPP and called CPPP.