Simplifying Concepts

Essence of Life is in Simplicity

Compare LILO and GRUB

Compare LILO and GRUB.

Difference between LILO and GRUB.
Differentiate between LILO and GRUB

Differentiate/Difference between/ Compare LILO and GRUB.

LILO & GRUB

LILO & GRUB

Factors/Criteria

LILO

GRUB

Terminology:

LILO stands for Linux Loader.

GRUB stands for Grand Unified Boot Loader.

Interactiveness:

LILO does not support interactive command interface.

GRUB supports interactive command interface.

Network:

It does not support booting from network.

It supports booting from network.

Type:

It acts as a boot loader for Linux OS.

It can boot different type of OS’es.

Stores:

It stores info regarding location of OS into MBR, thus each time new OS is added the config files need to be manually feeded.

It automatically detects any change in config files and automatically loads the operating system.

Support:

There is no assistance of good technical support.

It has a good technical support compared to LILO.

Boot:

It can boot around 16 OS from floppy drive, or hard disks.

It supports or can boot unlimited number of boot entries.

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Difference between FCFS,SJFS and Round Robin

Difference between FCFS,SJFS and Round Robin.

Difference between FCFS,SJFS and Round Robin.
Compare Scheduling algorithms

Differentiate/Compare/ Difference between FCFS,SJFS and Round Robin algorithms.
Differentiate/Compare/ Difference between scheduling algorithms.

Difference between FCFS,SJFS and Round Robin

Scheduling Algorithms

Factors

FCFS

SJFS

Round Robin

Type:

Not suitable for time sharing systems.

Not suitable for time sharing systems.

Suitable for time sharing systems.

Pre-emptiveness:

It is non pre-emptive.

It can be pre-emptive or non pre-emptive.

It is pre-emptive.

Priority:

No priority, processes execute on first cum first basis.

It is a priority algorithm in which priority is inverse of CPU burst.

Not a priority based algorithm.

Execution time:

Process is executed for the time equivalent to CPU burst time.

Process is executed for the time equivalent to CPU burst time.

Process is executed for quantum time ‘q’ after which it is pre-empted.

Type of Queue:

It uses a FIFO queue.

It uses a priority queue.

It uses FIFO circular queue.

Drawbacks:

It suffers from convoy effect.

It is difficult to predict the next CPU burst time of a process.

The long quantum time degenerates into FCFS.

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Difference between Circuit,Virtual Circuit and Datagram Switching

Difference between Circuit,Virtual Circuit and Datagram Switching.

Compare Circuit,Virtual Circuit and Datagram Switching.

Differentiate/Compare/ Difference between Circuit,Virtual Circuit and Datagram Switching.

Circuit & Virtual Circuit

Circuit & Virtual Circuit

Parameters

Circuit

Virtual Circuit

Datagram/Routing

Type

Connection oriented

Connection oriented

Connectionless

Circuit Established

A dedicated circuit is established between source & destination.

A virtual circuit is established between source & destination before data transfer.

No circuit or path is established.

Type of delivery

Sequential

Sequential

Out of order

Overheads

No header overheads.

Only label overheads.

Higher overhead.

Resource Allocation

Resources are allotted before data transfer.

Resources are allocated on demand.

No resource allocation required.

Type of data

Stream oriented.

Packet oriented.

Packet oriented.

Reliability

Highest

Good

Unreliable

Delay

Low

High

Unpredictable

Used for

Voice

Data

Data

Examples

Telephone systems.

X.25, frame relay.

Internet

Bandwidth

Fixed

Dynamic

Dynamic

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Difference between Connection Oriented and Connectionless

Difference between Connection Oriented and Connectionless.

Compare Connection Oriented and Connectionless.

Differentiate/Compare/ Difference between Connection Oriented and Connectionless.

Protocol/Criteria

Connection-Oriented

Connectionless

Resource Allocation:

Resources need to be allocated.

No prior allocation of resource is required.

Utilization:

It often leads to low or underutilization of resources.

It ensures optimal usage of resources.

State info:

Lot of state related information needs to be stored.

Not much of information is required as packets are sent randomly.

Reliability:

It ensures reliable transfer of data.

Reliability is not guaranteed as it is a best effort service.

Connection:

Prior connection needs to be established.

No prior connection is established.

Delay:

There is more delay in transfer of information, but once conn. established faster delivery.

However there is no delay due absence of connection establishment phase.

Packet travel:

In this packets travel to their destination node in a sequential manner.

In this packets reach the destination in a random manner.

Congestion:

Congestion is not at all possible.

It is likely that congestion occurs.

Signalling:

Connection is established through process of signalling.

There is no concept of signalling.

Suitability:

It is suitable for long and steady communication.

It is suitable for bursty transmissions.

Transfer mode:

It can be implemented either using Circuit Switching or VCS.

It is implemented using Packet Switching.

Retransmission:

It is possible to retransmit the lost data bits.

It is not possible.

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Difference between Ebusiness and Ecommerce

Difference between Ebusiness and Ecommerce.

Compare Ebusiness and Ecommerce.

Differentiate/Compare/ Difference between Ebusiness and Ecommerce.

Ebusiness & Ecommerce

Ebusiness & Ecommerce

ECommerce

EBusiness

Ecommerce involves commercial transactions done over internet.

Ebusiness is conduct of business processes on the internet.

Ecommerce is subset of Ebusiness.

Ebusiness is superset of Ecommerce.

Ecommerce is use of electronic transmission medium that caters for buying and selling of products and services.

In addition, Ebusiness also includes the exchange of information directly related to buying and selling of products.

Thus, Those activities which essentially involve monetary transactions are termed as “e-commerce”.

In addition it includes activities like procurement of raw materials or goods, customer education, looking for suppliers etc.

Ecommerce usually requires the use of just a Website.

Ebusiness involves the use of CRM’s, ERP’s that connect different business processes.

Ecommerce covers outward facing processes that touch customers,suppliers and external partners.

E-business covers internal processes such as production, inventory management, product development, risk management, finance etc.

Ecommerce just involves Buying and selling of products and services.

Ebusiness includes all kinds of pre-sale and post-sale efforts.

Ecommerce is narrower concept and restricted to buying and selling.

It is a broader concept that involves market surveying, supply chain and logistic management and using Datamining.

It is more appropriate in B2C context.

It is used in the context of B2B transactions.

Ecommerce involves the mandatory use of internet.

Ebusiness can involve the use of internet, intranet or extranet.

Example- Buying of pendrive from Amazon.com is considered Ecommerce.

Example- Using of Internet by Dell, Amazon for maintaing business processes like Online customer support, email marketing, suplly chain management.

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