HTTP PROXY SERVER
1)How to block some IP addresses of users so that they cann't access some defined sites by use of Webmin in Squid Server(access contol) ?
2)What is Proxy Chaining?
PROTOCOL STACK
1)What is ISDN protocol stack?
2)What Network Management Protocol does the OSI Protocol Stack use?
2 comments:
HTTP PROXY SERVER:
Ans2.
HTTP proxies could be organized into a chain and this will significantly improve your anonymity on the Internet. However, the construction of such chain is related to a number of difficulties. The main difficulty is that for connection into a chain you should use special software. Browsers (and majority of programs) do not allow to create and use chains of proxy servers. To organize proxies into a chain, it is necessary to organize tunneling of requests: there is created a virtual tunnel, which passes through an HTTP proxy and, using this tunnel, the program can "make a path" through some proxy servers to a specific web server.
Besides that, in order to carry out tunneling of requests, an HTTP proxy should support SSL (Secure Sockets Layer). This is an additional feature designed for protection of connections from interception and decoding. Except for pure protection, the SSL allows to organize "a virtual tunnel" through a chain of proxy servers. To find out whether a proxy supports a SSL server is quite simple: access using this proxy any site, where set the HTTPS protocol (for example mail server HotMail.com). Make sure that in an address line before a server name there is the https:// prefix and if you could see this page through a proxy server, it means your proxy supports the SSL.
An example of a program, which is capable to create such virtual tunnel, is SocksChain (http://www.ufasoft.com). This program allows to work with any Internet service through a chain of SOCKS or HTTP proxies.
Other example is the HTTPort program (http://www.htthost.com). It can organize a chain from not more than 2 proxies, but it has some advantages. It allows creating a port mapping through HTTP proxy.
by CC7
Integrated Services Digital Network (ISDN) is a digital, point-to-point network capable of transmitting speeds of about 2Mbps. A computer connects to an ISDN line via an ISDN adapter and uses the same type of wiring as a Telephone wire. The only difference is ISDN can carry analog (voice) and digital signals, so it can be used to connect to the Internet. It can be connected by the phone company but it is rarely used as it needs special equipment and is more expensive than other way.
osi model uses many network protocol like
# Connectionless Networking Protocol
# EGP Exterior Gateway Protocol
# EIGRP Enhanced Interior Gateway Routing Protocol
# ICMP Internet Control Message Protocol
# IGMP Internet Group Management Protocol
# IGRP Interior Gateway Routing Protocol
# IPv4 Internet Protocol version 4
# IPv6 Internet Protocol version 6
# IPSec Internet Protocol Security
# IPX Internetwork Packet Exchange
# SCCP Signalling Connection Control Part
# AppleTalk DDP
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