Firewall architectures-screened host architecture, Computer Networking

Assignment Help:

Screened Host Architecture


This architecture consists of two host machines: a Screening Router and a Screening Host. Screening Router is placed between a local network and the Internet. Its purpose is to block all direct communication between two networks. Only traffic that is allowed to pass through is that coming from the host machine and destined for the Internet or coming from the Internet and destined for the host machine.

Screened Host is the only machine that can be accessed from the Internet and usually runs proxy applications for allowed services. Other hosts on the intranet must connect to proxy service on the host machine in order to use the Internet.This architecture is more flexible than Dual Homed Host architecture. In this setup if a proxy application does not exist for some secure service it can be allowed to pass through the screening router directly to the client on the local network .

 Advantages


•Provides better security and filtering rules are simple
•Provides transparent outbound access and restricted inbound access


 Disadvantages


•If proxy application does not exist for some service logins have to be provided to the local users to use that service or to abandon that service completely
•If both host machines are not configured properly to work together it may leave holes in the firewall that can be exploited by the attacker


Related Discussions:- Firewall architectures-screened host architecture

Subnet layer of the tcp-ip model, Q. Subnet layer of the TCP-IP model? ...

Q. Subnet layer of the TCP-IP model? These two layers of the OSI correspond straight to the subnet layer of the TCP/IP model. Majority of the time the lower layers under the

Explain communications channels, A communications channel is pathways over ...

A communications channel is pathways over which information can be communicate. It may be described by a physical wire that connects communicating devices, or by a radio, laser, or

Destination port number - transport layer, Destination Port Number Thi...

Destination Port Number This is  port number used by the process  running on the destination host. It is also 16 bits long  if the destination  host if  server ( a client  sen

Bluej programming, i have been given a question:- any 50 numbers are given ...

i have been given a question:- any 50 numbers are given and to find out the 1)frequency of odd and even numbers 2)frequency of positive and negative numbers

Osi reference model - fundamentals of networks, OSI Reference  Model ...

OSI Reference  Model Normal 0 false false false EN-IN X-NONE X-NONE

Ports, It is an additional 16-bit number which uniquely identifies the spec...

It is an additional 16-bit number which uniquely identifies the specific service on any given machine on the Internet. Port numbers are 16 bit wide, so each of the computers on the

Network design, Get the network design for a company

Get the network design for a company

Ajax, Ajax is a relatively new set of techniques that, in a sense, implemen...

Ajax is a relatively new set of techniques that, in a sense, implement some of the functionalities originally provided by RPC. Ajax is primarily used to build web applications with

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd