CS507 Current Solved Papers by Tanveer Online Academy

Tanveer Abbas

M.sc math +B.ed

Cs507 current paper

1 Change Over 3 m

This phase comprises of those activities undertaken to replace the new system in operation from the

existing system. Following ways of change over can be undertaken

• Abrupt change over – stop the existing system abruptly to shift over to new one
• Phased change over – Both are run but output of both the systems is used since functions

performed are different.

• Parallel change over – Both systems are run simultaneously for a period of time and output of

either of the systems is used. Functions performed by both are same.

2 Prototyping 3m

“Prototyping is the process of quickly putting together a working model in order to test various aspects of the design to gather early user feedback.” The working model made during this process is called “Prototype” .

Step

Define User · Requirement · Design/Develop · Prototype · Implement Prototype · Use Prototype · Build actual system · 3 Advantages of Prototype 5m

• Prototypes may be easily changed or even discarded.
• Prototyping may improve communication between and among developers and customers
• Users may be more satisfied with systems developed using prototyping.
• A prototype may provide the proof of concept necessary to attract funding.
• Early visibility of the prototype may help management assess progress.
• Prototypes may demonstrate progress at an early stage of development

4 Object Oriented Analysis and Design (OOAD) 3m

The concept of object oriented analysis and design focuses on problems in terms of classes and objects. This concept combines aspects of both entity relationship diagram and data flow diagrams. The object oriented analysis and design tool has been devised to support the object oriented languages, for example C++ and Java.

5 Types of Threats 3m

• Physical threat – This refers to the damage caused to the physical infrastructure of the

systems, e.g.

• Fire
• Water
• Energy Variations
• Structural damage
• Pollution
• Intrusion
• Logical – This refers to damage caused to the software and data without physical presence.
• Viruses and worms
• Logical intrusion

6 Sources of Transmissions table me pocha jye ga 5 m

Virus or worms are transmitted easily from the internet by downloading files to computers web browsers. Other methods of infection occur from files received though online services, computer bulletin board systems, local area networks. Viruses can be placed in various programs, for instance

1. Free Software – software downloaded from the net · 2. Pirated software – cheaper than original versions · 3. Games software – wide appeal and high chances · 4. Email attachments – quick to spread

5. Portable hard and flash drives – employees take disks home and may work on their own

personal PC, which have not been cleaned or have suitable anti-viruses installed on them.

3m

A Trojan horse

A Trojan horse is a malicious program that is disguised as or embedded within legitimate software. They may look useful or interesting (or at the very least harmless) to an unsuspecting user, but are actually harmful when executed. Examples are

• Logic bomb – Trojan horses are triggered on certain event, e.g. when disc clean up reaches a

certain level of percentage

• Time bomb – Trojan horse is triggered on a certain date.

8 Active monitors 3m colum matching me hoga

This software serves the concurrent monitoring as the system is being used. They act as a guard against viruses while the operating system is performing various functions e.g connected to internet, transferring data, etc. It blocks a virus to access the specific portions to which only the operating system has the authorized access.

Implementation of controls is a critical security feature of information systems. They block and detect various forms of intrusion and protect various components of the entire

systems, are these telecommunication lines or computer software’s and hard wares.

1. Access Controls – Controlling who can access the system.
2. Input Controls – Controls over how the data is input to the system.
3. Communication Controls – Controls over the transfer of data between LAN, WAN or

internet.

4. Processing Controls – controlling the processing of data
5. Database Controls – Securing the most important asset of the organization
6. Output controls – controlling the privacy of the data.

9 Types of recovery Strategies 3

Disaster recovery must meet two requirements. First, The minimum application and application data requirements. Second, the time frame in the application and applications data requirements must be made available. Following are the various recovery strategies.

1. Cold Site
2. Hot Site
3. Warm Site
4. Reciprocal agreement
5. Third Party arrangements

3m

Firewall Security Systems 2 philosophy

Deny-all philosophy -- which means that access to a given recourses will be denied unless a user can provide a specific business reason or need for access to the information resource.

• Accept All Philosophy -- under which everyone is allowed access unless someone can provide a reason for denying access.

can be classified as · Commerce models · The most prevalent of E

Business to Consumer (B2C)

2. Business to Business (B2B),
3. Business to Employee (B2E),
4. Consumer to Consumer (C2C) and
5. E-Government

• Government to Citizens/Customers (G2C)
• Government to Business (G2B)