Isa Case Study

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TABLE OF CONTENTS


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2. Differences between desktop publishing and web publishingDesktop publishing Web publishing

It describes page layout skills, whichinvolve mixing text and graphics to

produce high quality output for

commercial printing.

It deals with organizing WebPageswhich include text, pictures, sound and

video into a coordinated unit (website)

and posting it into a web server to render

them accessible by the world wide web

users through a Uniform Resource

Locator (URL).

You need a Microcomputer and a mouse,

scanner, laser or inkjet printer and

desktop publishing software to be able to

do desktop publishing.

You need a web server to publish a

website

Table 2 Difference between Desktop and Web Publishing


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3. Client server architecture and peer-topeer architectureClient server architecture Peer- topeer architecture

It is based on a structure where a server(a high performance machine) running on

one or more server programs hosts all the

resources and can share the resources

with the clients (machines

attached/dependent on the server) upon

requests.

In this architecture a machine on thenetwork can simultaneously act as both

a client and a server, and each has

equivalent responsibilities and status.

Server is dedicated for storage and

managing data.

All the machines can hold and share

resources on an equal status

Clients are able to process data when

server is not working.

No control to access the resource

machine

Used for both WAN and LAN Used for LAN (local area network)

Table 3 Compare client/server & peer to peer architechture

4. Comparing how a caching server differs from a web server

Caching proxies keep local copies of frequently requested resources, which significantly

reduces the upstream bandwidth usage to increase performance while a web server

accepts HTTP requests from clients (user agents such as web browsers), and serves them

directly with responses.


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5. Differences between hosting a site and hosting a web server

Hosting a site Hosting a web server

It is to provide space for individuals or

organizations on a server to allow them

upload their website to be accessible via

the world wide web.

It gives you control over your site. Its

connected to the internet and is given an

IP- address. It is secured and monitored

and its not used for other tasks.

Table 4 Difference server and web hosting

6. Main features that differentiate IPv6 and IPv 4IPv6 IPv4

Has a much larger address space than

IPv4. It uses a 128-bit address thus

allows for hierarchical structure of the

address space and provides enough

address

It uses a 32-bit IP address that we

commonly use

Can support upto 2128 address to fulfil

future needs with better security and

network related features

Can support up to 232 address

Has a fixed length header of 40 bytes.IPV6 functionality is built into

ICMPV6.This allows for faster

processing


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It has enhanced security and Qos features

for permanent connectivity

Table 5 Difference of features in IPV6 from IPV4

TASK 1b

Feasibility report

To analyze the web hosting approaches at hand with regard to the project involved

(medium sized estate agent), consider the pros and cons of the hosting approaches.

Setting your own web server

This is an option that gives you control over your site. You need to purchase a suitable

machine and get connected to the Internet via an ISP and be given a domain name and

also assigned a static public IP address. IP address is given to computers that can access

network from anywhere. This machine is dedicated and must be backed up, be secured

and also be monitored.

Cost effectiveness

You need expertise and people who are qualified together with network technicians to

maintain. This makes it to be expensive, as it also needs very reliable telecommunication

link.


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Dedicated hosting

A dedicated hosting service is a type of Internet hosting in which the client leases an

entire server not shared with anyone. This is more flexible than shared hosting, as

organizations have full control over the server(s), including choice of operating system,

hardware, etc. In some cases a dedicated server can offer less overhead and a larger

return on investment. Dedicated servers always offer large amounts of bandwidths

compared to shared server which translates into faster data transmissions.Cost effectiveness

This option is not cost effective since the organization is medium sized and does not

require a dedicated server. This option is ideal for very large organizations with massive

information traffic.

Collocated hosting

In this case you still have to buy a machine and configure it just like setting up your own

web server but instead of having to install a network connection to your office your ISP

will house the server for you. ISP that does the co location will place your machine in

their server room and connect it to their network. This allows you the flexibility of having

your own server and the benefits of having a very fast network connection.

Cost effectiveness

The organization will be required to pay fraction of what a dedicated telecommunication

line would cost. You have to hire your own web designer to update your website or

contract an ISP to do so hence make it to be expensive.


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Virtual Shared hosting

Virtual hosting is a method that servers such as web servers use to host more than one

domain name on the same computer, sometimes on the same IP address.

Virtual hosting allows a website owner to have a site hosted on a web server that is

shared with other websites. In simple terms, the virtual hosting company's server will

allocate out hosting services and bandwidth to more than one website. Virtual web

hosting is a cheaper hosting option because you won't have to pay for a dedicated server

to host just your website.

Virtual web hosting is a good solution for small- to medium-sized (and even some larger)

websites that aren't constantly being visited or that have reasonable bandwidth needs.

There are two basic methods of accomplishing virtual hosting: name-based, and IP

address or IP -based.

Cost effectiveness

This option is very cost effective given that the estate agency is a medium sized and

therefore does not require a high bandwidth considering the amount of data transfer

involved. Its a cheap way to own a domain because there are no servers to maintain.

Free hostingA free web hosting service is a web service is free usually advertisement-supported. Free

web hosts will usually provide a sub domain (yoursite.example.com) or a directory

(www.example.com/~yourname). In contrast, paid web hosts will usually provide a

second-level domain along with the hosting (www.yourname.com). Many free hosts do


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allow use of separately purchased domains. Rarely, a free host may also operate as a

domain name registrar.

Draw back

The host will only provide a sub domain, which has some limitations, which include

limited storage.

The host may also make it conditional that they have their banners and advertisement on

your website which can compromise on the original objective of you website.

Recommendation(s)

Considering the feasibility of the above mentioned web hosting options in terms of cost

effectiveness and technical appropriateness I would recommend the option ofVirtual Hosting

since it is both cost effective and technically appropriate for the type of enterprise which is a

medium sized estate agency.

TASK 2 Installing the IIS and Apache simultaneously

Install the IIS server

If you are running Windows XP Professional on your computer you can install Microsoft's web

server, Internet Information Server 5.1 (IIS) for free from the Windows XP Pro installation CD

and configure it to run on your system by following the instructions below: -


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1. Place the Windows XP Professional CD-Rom into your CD-Rom Drive.

2. Open 'Add/Remove Windows Components' found in 'Add/Remove Programs' in the 'Control

Panel'.

3. Place a tick in the check box for 'Internet Information Services (IIS)' leaving all the default

installation settings intact.

4. Once IIS is installed on your machine you can view your home page in a web browser by

typing 'http://localhost' (you can substitute 'localhost' for the name of your computer) into the

address bar of your web browser. If you have not placed your web site into the default directory

you should now be looking at the IIS documentation.

5. If you are not sure of the name of your computer right-click on the 'My Computer' icon on

your desktop, select 'Properties' from the shortcut menu, and click on the 'Computer Name' tab.

6. Your default web directory to place your web site in is 'C:\Inetpub\wwwroot', but if you don't

want to over write the IIS documentation found in this directory you can set up your own virtual

directory through the 'Internet Information Services' console.

7. The 'Internet Information Services' console can be found in the 'Administration Tools' in the

'Control Panel' under 'Performance and Maintenance', if you do not have the control panel in

Classic View.


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IIS INSTALLATION SCREEN SHOTS


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APACHE INSTALLATION


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TASK 2 (B) Stop, Restart, activities performed on the servers


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1. Stop screen shot of APACHE


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2. Restart screen shot of APACHE

If you try to run apache 2.2 again the following error appears because the IIS is running.


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Repetition of the same activities on the IIS server

One can stop the IIS server at any time, so if you share your PC with your peers or family

members, you should make sure that IIS is up and running.

Click the Start button, Control Panel button, Performance and Maintenance link, Administrative

Tools link, and then double-click the Internet Information Services icon.

Expand the plus sign next to the Internet Information Services icon on the left side of the

window. Expand the plus sign next to the local computer icon, and then expand the Web Sites

icon.

Right-click the Default Web Site icon and make sure that the Start option is grayed out. You can

see how to stop or pause the IIS server.

1. Stop activity screen shot of IIS


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Screen shot of IIS when apache is stopped


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2. Restart screen shot of IIS

If Apache is started IIS will give an error when started.


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3. Pinging the server to check that it is live

Instructions

Step 1: In Windows XP, click Start and Run. Then type "cmd" and press Enter.

In Windows Vista, click Start, then type "cmd" and press Enter.

This will open the command prompt window with a black background.

Step 2:Type "ping " and press Enter. A server name can be either a

computer or website name. For example:

ping yahoo.com

Step 3: Read the server IP address. The first line of the ping output contains the server IP

address (in brackets). Below is an example of such a line. The IP address 127.0.0.1.

"Pinging APACHE [127.0.0.1] with 32 bytes of data or

Ping packet internet Gropper you have to ping 172.16.144.192

Step 4: Analyze the ping statistics. The last three lines of the output contain the ping

information. For example: "Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate roundtrip times in milliseconds: Minimum = 67ms, Maximum = 68ms,

Average = 67ms"

Note that shorter roundtrip times mean better connection to a server. A high percentage of lost

packages are an indication of a poor connection.


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This shows that the server is live after ping the two servers


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This indicates that the servers are live.

This show that the server is live after being test ping

4) Testing that the IIS and APACHE servers are running correctly

Testing the local host URL:http://localhost/localstart
http://localhost/localstarthttp://localhost/localstarthttp://localhost/localstarthttp://localhost/localstart


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Internet information services server test page


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APACHE server test page


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C) Simple web page created on IIS server


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d) Configured Logging for Microsoft's IIS version 5 Server

To view the Web Server statistics (hits, pages viewed, etc.) from ShopSite, the server log

format needs to conform to the NCSA format. Follow these steps to set the logging format.

1. Open the Internet Information Services window by clicking Start ProgramsAdministrative Tools Internet Service Manager.

2. Click the plus sign (+) next to your server's name.3. Right click on Default Web Site, then click Properties.4. Ensure that the Enable Logging box is checked.5. Select NCSA Common Log File Format for the Active log format.6. ClickOK


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#

# The following directives define some format nicknames for use with

# a CustomLog directive (see below).

#

LogFormat "%l %u %t \"%r\" "%{Referer}i\" \"%{User-Agent}i\"" combined

LogFormat "%h %l %u %t \"%r\" %>s %b" common

# You need to enable mod_logio.c to use %I and %O

LogFormat " %l %u %t \"%r\" "%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio


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e) The most common log file formats with their need to have them

h = hostname

l = login name

u = username

t = time

r = request (POST and GET)

s = status

b = bytes (size)

f) How one can achieve the following objectives by logging the web server

activity.

1.

find out who visited your site2. find out what was viewed3. find out when the information was last viewed4. Monitor attempts to access your sites, virtual folders or files.5. Determine whether attempts were made to read and write to your files.


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g) Tool for analyzing logs (IIS Log Parser)

Log parser installation


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Log Paser 2.2 setup

Click to finish

installation


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Running the parser after the installation


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Demonstrating the usage of parser by pinging which was successful


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TASK 3 TCP/IP protocals

Network protocol suite

The network Protocol Suite (commonly known as TCP/IP) is the set of communications

protocols used for the Internet and other similar networks. It is named from two of the

most important protocols in it: the Transmission Control Protocol (TCP) and the Internet

Protocol (IP), which were the first two networking protocols defined in this standard.

The network Protocol Suite, like many protocol suites, may be viewed as a set of layers.

Each layer solves a set of problems involving the transmission of data, and provides a

well-defined service to the upper layer protocols based on using services from some

lower layers. Upper layers are logically closer to the user and deal with more abstract

data, relying on lower layer protocols to translate data into forms that can eventually be

transmitted.

TCP/IP protocol system

It is network communication set of rules defining how data transmission takes place

within a network system. Its an industry standard protocol and a layered set of many

protocols that enables communication in different networking environments. It also

enables computers to communicate

across network segments of different platforms.

The TCP/IP model consists of four layers (RFC 1122). From lowest to highest, these

are the Link Layer, the Internet Layer, the Transport Layer, and the Application

Layer.


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Desirability of TCP/IP standards

Ordered data transfer - the destination host rearranges according to sequencenumber

Retransmission of lost packets - any cumulative stream not acknowledged will beretransmitted discarding duplicate packets.

Error-free data transfer Flow control - limits the rate a sender transfers data to guarantee reliable delivery.

When the receiving host's buffer fills, the next acknowledgement contains a 0 in

the window size, to stop transfer and allow the data in the buffer to be processed.

Congestion control - sliding window. Its an industry standard Its an open protocol that is not controlled by a single organization It contains a set of utilities for connecting dissimilar operating system Its scalable meaning you can expand or shrink the network Its embedded in most modern operating systems

How TCP/IP addresses:

Logical addressing

In a system supporting virtual memory, there may actually not be any physical

memory mapped to a logical address until an access is attempted. The access triggers

special functions of the operating system that reprogram the Memory Management

Unit to map the address to some physical memory, perhaps writing the old contents of


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that memory to disk and reading back from disk what the memory should contain at

the new logical address. In this case, the logical address may be referred to as a

virtual address.

Routing

A routing protocol specifies how routers communicate with each other,

disseminating information that enables them to select routes between any two

nodes on a computer network, the choice of the route being done by routing

algorithms. Each router has a prior knowledge only of networks attached to it

directly. A routing protocol shares this information first among immediate

neighbors, and then throughout the network. This way, routers gain knowledge of

the topology of the network.

Name service

It enables the look up of a name and information associated with that name. As a

word in a dictionary may have multiple definitions, in a directory, a name may be

associated with multiple, different pieces of information. A directory service is

simply the software system that stores, organizes and provides access to

information in a directory.

A simple directory service called a naming service, maps the names of network

resources to their respective network addresses. With the name service type of

directory, a user doesn't have to remember the physical address of a network

resource; providing a name will locate the resource. Each resource on the network

is considered an object on the directory server. Information about a particular


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resource is stored as attributes of that object. Information within objects can be

made secure so that only users with the available permissions are able to access it.

Error control and flow control

Error detection

In a typical TCP/IP system, error detection is performed at multiple levels:

Each Ethernet frame carries a CRC-32 checksum. The receiver discardsframes if their checksums do not match.

The IPv4 header contains a header checksum of the contents of the header(excluding the checksum field). Packets with checksums that don't match

are discarded.

The checksum was omitted from the IPv6 header, because most currentlink layer protocols have error detection.

UDP has an optional checksum. Packets with wrong checksums arediscarded.

TCP has a checksum of the payload, TCP header (excluding the checksumfield) and source- and destination addresses of the IP header. Packets

found to have incorrect checksums are discarded and eventually get

retransmitted when the sender receives a triple-ack or a timeout occurs.

Flow control

Flow control is the process of managing the rate of data transmission

between two nodes to prevent a fast sender from overrunning a slow

receiver. It provides a mechanism for the receiver to control the


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transmission speed, so that the receiving node is not overwhelmed with

data from tranceiving nodes. The transport layer is responsible for making

sure that the sending node and the receiving node are well synchronized.

Application support

This is implemented by the application layer in the TCP/IP protocol that enables

process-to-process communication between connections in a network.

TASK 4 To View cookies settings

In Internet Explorer, click Internet Options on the Tools menu, and then click the

Security tab.

Click the Web content zone you want, and then click Custom Level.

Under Cookies, click the options you want, click OK, and then click OK.


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This window opens to view the cookies click on the view files option.


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After a click on the view files the above window opens which shows the cookies that are in the

computer.


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All cookies removed using an appropriate tab at the browser and checking the appropriate file to

view the cookies if any are stored in the hard drive


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3) Screen shots of visit onhttp://www.translink.co.uk/site, msn.com

site,http://www.bonzi.com/ site when prompted to allow cookie settings,
http://www.translink.co.uk/http://www.translink.co.uk/http://www.translink.co.uk/http://www.translink.co.uk/


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4) Cookie setting in the browser and view cookies


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b) Viewing cookies in NETSCAPE MANAGER


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Removed all the cookies using an appropriate tab at the browser and check

the appropriate file to view the cookies if any are stored on my hard drive.


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Visited these siteshttp://www.translink.co.uk/, msn.com andhttp://www.bonzi.com/.

When prompted, allow cookie setting in NETSCAPE broswer
http://www.translink.co.uk/http://www.translink.co.uk/http://www.translink.co.uk/http://www.bonzi.com/http://www.bonzi.com/http://www.bonzi.com/http://www.bonzi.com/http://www.translink.co.uk/


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Check cookie setting in the NETSCAPE browser and view cookies.


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c) In Internet Explorer, view history of the sites visited. Delete all the history

and visit new sites and then view history to see new history being built.

Perform the same activities in Netscape browser.


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SAMPLES WITH NETSCAPE


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d) Find cookies and the history files on the hard drive and print samples giving as much

explanation as you can.


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Removing cookies


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http://www.translink.co.uk/site when prompted to allow cookie settings in Netscape browser
http://www.translink.co.uk/http://www.translink.co.uk/http://www.translink.co.uk/


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Msn.com site when prompted to allow cookie settings in Netscape browser


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http://www.bonzi.com/ site when prompted to allow cookie settings in Netscape browser


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Viewing cookies after removing the ones stored in the hard drive


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c) View history of sites visited

Go to favorites center tab (yellow star tool bar), click history.

To remove the cached Internet address entries, clear the History folder.

Close all running instances of Internet Explorer and all browser windows.

In Control Panel, click Internet Options.

Click the General tab, and then click Clear History.


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Click yes, and then click OK to close the Internet Options dialog box.


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SAMPLES WITH NETSCAPE


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c) Viewing history of sites visited


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d) Sample of cookies and the history files on the hard drive


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d) finding cookies and the history


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e) Privacy implications of different settings for cookies and history


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f) The various options available for managing digital certificates in both Internet Explorer and

Netscape browser

http://www.simplysign.co.uk/support/using_outlookexpress5_secure_email.html
http://www.simplysign.co.uk/support/using_outlookexpress5_secure_email.htmlhttp://www.simplysign.co.uk/support/using_outlookexpress5_secure_email.htmlhttp://www.simplysign.co.uk/support/using_outlookexpress5_secure_email.html


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g) Various options available under the advanced options in both the browsers. In the Internet

Explorer this option can be found in Internet options under the tools tab, and in the Netscape

browser it can be found in preferences under the tab edit.


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Brief descriptions of the advanced options on internet explorer

Accessibility

Option contains functions to do with browser accessibility

Browsing

Contains options to do with browsing operations E.g automatically check for

internet explore updates.

HTTP settings

This option specifies which transfer protocol to use.

Multimedia

This option allows you to set the multimedia settings to use E.g. whether an image

should be resized automatically e.t.c

Printing

This option allows you to set printing preferences e.g. whether to have print outs

with background images or not.


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BIBLIOGRAHY

1. Protocal.com (2009),TCP/IP protocols, retrieved on 4-september from:http://www.protocols.com/pbook/tcpip1.htm

2. Webopedia.com(2009),TCP/IP , retrieved on 4-september from:http://www.webopedia.com/TERM/T/TCP_IP.html

3. Webwizguide.com(2009),INSTALLING-IIS-WINXP, retrieved on 4-september from:http://www.webwizguide.com/kb/asp_tutorials/installing_iis_winXP_pro.asp

4. Microsoft.com (2009),IIS INSTLLATION, retrieved on 4-september from:http://social.msdn.microsoft.com/Search/en-US?query=iis%20installation&ac=8

5. Microsoft.com (2009),TCP, retrieved on 4-september from:http://social.msdn.microsoft.com/Search/en-US?query=tcp%2Fip&ac=8

6. Microsoft.com (2009),WEB SERVICE AND HOSTING, retrieved on 4-september from:http://social.msdn.microsoft.com/Search/en-US?query=web%20service%20hosting&ac=3

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