HTTP tunneling is used to encapsulate other protocols within
the HTTP or HTTPS protocols. It is typically used to pass
protocols that would normally be blocked by a firewall
through the firewall in a controlled manner.

There are two types HTTP tunneling 
 1.HTTP to Port

 2.Http To CGI
 
  this concept is frequently used in RMI

HTTP 1.1's connection keep-alive feature allows the TCP
connection between a browser and a Web server to remain open
throughout multiple HTTP requests and responses. This
significantly improves the overall performance of
browser-server communication.

Port is that which transfers data from one computer to 
another via a cable that links connecting ports.

Its nothing but logical address
that is 0 to 1023, these are resrved for servers
remaining 1024 to 65535 are clients

Preemptive multitasking also called "time slicing". 
Interrupting the execution of a process and passing control 
to another waiting process and performing a context switch 
after which the context for the next pending process is 
restored, and the next process is executed for the duration
of its time slice or "quantum".

I tis an object in java compiler. Used to 
manipulate/identify the InternetAddress(IP Address) of 
local system or remote system.

InetAddress is a class in java by which we can get IP 
address of any machine.
method is "public static InetAddress getLocalHost()"

An identifier for a computer or device on a TCP/IP network.

 Networks using the TCP/IP protocol route messages based on 
the IP address of the destination. The format of an IP 
address is a 32-bit numeric address written as four numbers 
separated by periods. Each number can be zero to 255. For 
example, 1.160.10.240 could be an IP address. 
Within an isolated network, you can assign IP addresses at 
random as long as each one is unique. However, connecting a 
private network to the Internet requires using registered 
IP addresses (called Internet addresses) to avoid 
duplicates. 

The four numbers in an IP address are used in different 
ways to identify a particular network and a host on that 
network. Four regional Internet registries -- ARIN, RIPE 
NCC, LACNIC and APNIC -- assign Internet addresses from the 
following three classes. 

Class A - supports 16 million hosts on each of 126 networks 
Class B - supports 65,000 hosts on each of 16,000 networks 
Class C - supports 254 hosts on each of 2 million networks 
The number of unassigned Internet addresses is running out, 
so a new classless scheme called CIDR is gradually 
replacing the system based on classes A, B, and C and is 
tied to adoption of IPv6.

IP address is a unique address for a host to connect in a 
network.IP has two types.one is private add another is 
public add.
it represent 32 bit binary number.it has two name part one 
is anetwork part another is host part.ip add. network part 
is fixed part and host part is unique part.an ip -add. 
controled by IANA-INTERNET ASSIGN NUMBER OF AUTHORITY.
An ip add. is normaly expressed in decimal format.

Every IP multicast group has a group address. IP multicast 
provides only open groups: That is, it is not necessary to 
be a member of a group in order to send datagrams to the 
group. 

Multicast address are like IP addresses used for single 
hosts, and is written in the same way: A.B.C.D. Multicast 
addresses will never clash with host addresses because a 
portion of the IP address space is specifically reserved 
for multicast. 

This reserved range consists of addresses from 224.0.0.0 to 
239.255.255.255. However, the multicast addresses from 
224.0.0.0 to 224.0.0.255 are reserved for multicast routing 
information; Application programs should use multicast 
addresses outside this range.

The difference is that TCP is responsible for the data 
delivery of a packet and IP is responsible for the logical 
addressing. 

In other words, IP obtains the address and TCP guarantees 
delivery of data to that address.

TCP is a protocol based on a connection between two 
computers. It is used for normal Internet traffic and 
applications such as web servers, FTP, etc.

UDP is a protocol based on connectionless communication. 

UDP is ideal for applications like video streaming and 
online gaming, where lost packets don't need to bre 
retransmitted and speed takes precedence.

TCP/IP is a two-way communication between the client and the
server and it is a reliable and there is a confirmation
regarding reaching the message to the destination.it is like
a phone call.
  UDP is a one-way communication only between the client and
the server and it is not a reliable and there is no
confirmation regarding reaching the message to the
destination. it is like a postal mail.

TCP is a Transmission Control Protocol. 
UDP is a User Datagram Protocol.
There are four major differences between UDP and TCP:
1. TCP can establishes a Connection and UDP cannot.
2. TCP provides a stream of unlimited length, UDP sends 
small packets.
3.TCP gurantees that as long as you have a connection data 
sent will arrive at the destination, UDP provides not 
guarantee delivery.
4.UDP is faster for sending small amounts of data since no 
connection setup is required, the data can be sent in less 
time then it takes for TCP to establish a connection.

TCP is Tranmission Control Protocol

IP - Internet Address

UDP - User Datagram Protocol.

URL means Universal Resource Locator

URL stands for Uniform Resource Locator and it points to
resource files on the Internet.
  URL has four components.
http://www.allinterview.com:80/index.html
http - protocol name,
allinterview - IP address or host name,
80 - port number,
index.html - file

url is a uniform or universal resource locator(An Internet
World Wide Web Address.)...which is used to find the web
pages....It includes the protocol, the domain and the name
of the file.

Inet address is one of identifier. This is used denote the 
IP address of the networked system.

Every computer connected to a network has an IP address.An
IP address is a number that uniquely identifies each
computer on the Net.An IP address is a 32-bit number.

DNS stands for Domain Name System, an Internet service that 
translates domain names into IP addressess. Because domain 
names are alphabetic, they're easier to remember.  The 
Internet however, is really based on IP addresses.  Every 
time you use a domain name, therefore a DNS service must 
translate the name into the corresponding IP address. For 
example, the domain name www.sudheer.com might translate to 
192.168.252.101.

It is very difficult to remember a set of numbers(IP
address) to connect to the Internet.The Domain Naming
Service(DNS) is used to overcome this problem.It maps one
particular IP address to a string of characters.
  FOr example, www.allinterview.com implies com is the
domain name reserved for commercial sites,allinterview is
the name of  the company and www is the name of the specific
computer,which is allinterview's server.

I cant understand this question.but i wrote what i know 
below

We can check from the server by using PING command.

We should use give the client name or IP address followed 
by the ping commands.

For example ping 128.0.0.156 -n 4

where -n and the 4 is no echo requests to send times.

if the client is connect with the server the reply is coming
with some informations.