Review of Apple iphone 4S

IPhone 4 is the best phone Apple have ever created. The special features of this phone that you can send your voice in messages, for searching data and for setting notices. It contains so many new software applications. The camera is 8 MP and the processor has two cores. Camcorder is also present with HD capability. The specifications of this phone are given: Operating System: Symbian

• Operating System: iOS 5
• PC/Internet Connectivity: WLAN, USB, GPRS, EDGE Class 32 and Blue tooth
• Camera:  8 MP
• Messaging: I messages, SMS, Email and MMS.
• Display: 3.5 inches
• Ringtones: MP3
• Entertainment: Audio/Video player, Games, iCloud cloud service, TV out and Twitter integration

Review of Nokia 5230

Nokia 5230 is an inventive mobile phone with Innovative technology. You can connect to people through so many options using this phone. It is good for social networkers. Its touch screen phone and it has a large screen (3.2 inch). You can play different applications using few fingertips. The design of the phone is really good. The specifications of the phone are given:

• Operating System: Symbian
• PC/Internet Connectivity: USB, GPRS, EDGE Class 32 and Blue tooth
• Camera:  2MP
• Messaging: SMS, Email,  MMS.
• Display: 3.2 inches
• Ringtones: MP3,Polyphoninc
• Entertainment: FM Radio, MP3/MP4 player, Games, Photo editor

OSI Model

The OSI Stands for Open Systems Interconnection. It is the model system for computer networking IP Networks technology. It defines seven layers. The layers are:

7 Application layer

6 Presentation layer

5 Session layer

4 Transport layer

3 Network layer

2 Data link layer

1 Physical layer

Application layer works behind the application softwares in our computers.

Presentation layer is responsible for formatting and conversion of data from one form to another form.

Session layer manages different sessions of different programs running at the same time.

Transport layer is responsible for transfer of data of UDP and TCP.

Network Layer works on L3 logical addressing (IP addressing).

Data link layer transfer data on the same network with the help of MAC addressing or Hardware addressing.

Physical layer is physical media of the link and transmits the data in form of bits and bytes.

SONY NWZ B153F PLAYER

Review about the player:

This device is reliable and easy to use. You can charge it with any PC through USB port and no external power is required. The total space is 4 GB and you can also use it as mass storage device. The battery provides approximately 15 hours play time. The life can be extended by using the player in Power saver mode. “Bass” button is also available. The other features include Recorder and FM Radio. Another new feature is ZAPPIN function that can be enable/disabled using ZAP button on the front of the player. The best thing about this player its size and durable build. The specifications of this player are given:

• Display: 3 Line LCD
• Weight: 28 grams
• Battery: Lithium
• Accessories: Head phone and High speed USB
• Formats supported: MP3/WMA
• Dimensions: 91 x 23 x 15 mm (approx.)

L3 Routing in IP Networks

What is L3 routing?

Routing is a procedure of transmitting a packet on a network from one place to another. The transmission happens with the help of addressing mechanism, IP Addressing. IP address is a 128 bit logical address. It can be bind on different networking devices like routers and L3 switches. The routers transmit the IP packets after finding their routes in the routing table. If the route of a packet does not exist, the packet drops immediately. The distribution of routes in a network can take place by two means:

• Static routing
• Dynamic routing

In static routing, The administrator has to bind all of the IPs on every single device manually. It means any change in network or addressing will result in reconfiguration of all devices.

While in dynamic routing,  routes between the devices exchanges using different protocols. This is more normally the preferred choice of engineers in large and complex networks. List of Dynamic routing protocols is given:

• EIGRP
• OSPF
• ISIS
• BGP

List of mobiles with Android OS.

Following is the list of mobile phones that have Android as their operating system. This list contains the models from Sony Ericsson, Samsung.and HTC.

• Sony Ericsson Xperia X10 Mini
• Sony Ericsson Xperia Arc
• Sony Ericsson Xperia X10
• Sony Ericsson Xperia X10 Mini Pro
• Samsung Galaxy Note
• Samsung Galaxy S II I9100
• Samsung P1000 Galaxy Tab
• Samsung I9000 Galaxy S 16GB
• Samsung Galaxy SL I9003
• Samsung Galaxy Ace S5830
• Samsung I5700 Galaxy Spica
• Samsung Galaxy 551
• Samsung Galaxy Pro B7510
• Samsung S5660 Galaxy Gio
• Samsung S5570 Galaxy Mini
• Samsung Galaxy Y S5360
• HTC Sensation XE
• HTC Sensation XL
• HTC Flyer
• HTC Sensation
• HTC Rhyme
• HTC Desire
• HTC Wildfire
• HTC Aria
• HTC Hero
• HTC Explorer
• HTC Desire HD
• HTC EVO 3D
• HTC Incredible S
• HTC Wildfire S
• HTC ChaCha
• HTC Salsa
• HTC Desire Z
• HTC Desire S