Wednesday, November 14, 2012

Network Management: Free 4G Wireless Internet

Network Management: Free 4G Wireless Internet



" Wireless vs Mobile"


Many people use the terms wireless and mobile as synonyms. This is not strictly true. In this table we try to illustrate the differences between the terms wireless and mobile.

Those users that are not wireless and not mobile are easy to come up with. This is what youcan call "traditional data communications" and consists of conventional LAN, MAN and WAN technology, such as ethernet, FDDI or X.25.

At the other extreme, there are users that are both wireless and mobile. So here we can have
taxis using radio modems, field service engineers (recall that Mobitex's first application was for Telia's field service engineers), transport and public safety users.

What about the users that are using wireless technology but are not mobile? These are the traditional "telemetry" applications that were mentioned in chapter 13. These include parking or gas meters and coke machines.

The last set of users, those that are mobile but not wireless are a little harder to define. Imagine the following scenario, I sit in my office in Gothenburg and work on my laptop PC connected to my local network. Then I pick up my laptop, jump on a plane and fly to Stockholm. There I plug my PC into the LAN in Stockholm and carry on working as if I was on my home network. In this case I'm using wired technology - the two Local Area Networks, but in some sense I'm mobile because I move around the country. This type of access is called Nomadic Computing. An example of technology that allows this kind of movement is Mobile IP, which will be explained in more detail later.

Network Management: Cloud Migration: iPhone, iPodTouch, iPad

Network Management: Cloud Migration: iPhone, iPodTouch, iPad


iphone wifi


Wireless instructions for iPhone and iTouch setups



Make sure your device has an active connection to the internet.

1. Go to Settings


2. Select Wi-Fi



3. Choose Other…


4. The Name of the network..........


5. Security is WPA Enterprise


6. Your Username and Password


7. After you enter your Username and Password, select Join


8. It may take a moment, but your device should connect to the WI-FI network *if* it is available in your location.



Token Passing Network



Ttoken passing definition



In token passing system, all stations are logically connected in the form of a ring and Manage of the admission to the medium is performed using a token. A token is an individual bit Guide or a tiny packet, more often than not several bits in length, which flow from node next node. Token passing can be used with both broadcast (token bus) and in order Connected (token ring) type of networks with some difference in the details as considered.

In case of token ring, token is passed data packets from a node to the physically neighboring node. On the other hand, in the token bus, token is passed with the assist of the MAC address of the computer which logical design in a ring. In either case a node currently holding the token has the’ right to transmit’. When it has got data to send, it removes the token and transmits the Data and then forwards the token to the next logical or physical computer tokens in the ring. If a node Currently holding the token has no data to send, it simply forwards the token to the next. The token passing scheme is resourceful compare to the polling technique, but it Realize on the correct and reliable operation of all the nodes. There exists a number of
Potential problems, such as lost token, duplicate token, and insertion of a node, removal Of a node, this must be tackled for correct and reliable operation of this scheme.


Token passing protocol

    The token passing protocol relies on a manage signal called the token. A token is a 24-bit packet that circulates all the way through the token passing network from NIC to NIC in an arranged manner. If a workplace wants to transmit a communication, first it must grab the token. At that end, the workplace has absolute manage over the communications channel. The subsistence of only one token eliminates the option of signal collision. This means that only one station can speak at a time. Token authentication may be a physical device that an authorized user of computer services is given to ease authentication. The term may also refer to software tokens. Token authentication is used to prove one's identity automatically the token is used in addition to or in place of a password to prove that the client is who they claim to be. Controlling network access the token acts like an electronic key to access something.


Some may store cryptographic keys, such as a digital signature, or biometric data, such as fingerprint minutiae. Some designs feature tamper resistant packaging, while others may include small keypads to allow entry of a PIN or a simple button to start a generating routine with some display capability to show a generated key number. Special design includes a USB connector, RFID functions or Bluetooth wireless interface to enable transfer of a generated key number series to a client system.
 

 

 

Tag

Assignment Lanka Tag Cloud
Computer Networks The History of Local Area Networks, LAN, The Topologies of a Networks, LANs describe different types of transmission Medias, Local Area Networks Access Methods, Carrier Sense Multiple Access with Collision Detect, Development of LAN Technologies. LAN -Token Ring, LAN Ethernet Digital, LAN - Ethernet Sun microsystems, LAN - Ethernet Mixed Environment, LAN - Token Ring was introduced by IBM LAN - IBM implementation of Token Ring, Token Ring Novell, LAN Token Ring - in a mixed environment, LAN - Fiber Distributed Data Interface, LAN - ATM, LAN Components, LAN Switching Methods, Virtual Local Area Network, Port based VLAN, Mac based VLAN, Protocol based VLAN, User Base VLAN, PC networks Components, PC networks Shared resources, PC Network operating systems, PC networks Novell Netware, PC networks Windows NT, PC networks IBM LAN Server Computer Programming Languages HTML Language, The Generations of Programming Languages, Different types of High Level Languages, Different types of High Level Languages Disadvantages
Computer Networks - IBM LAN Server, Windows NT Networks, Novell Netware, Network operating systems, Networks Shared, Networks Components, User Base, Protocol based, Mac based, Port based, VLAN, LAN Switching, LAN Components, ATM, Fiber Data, Token Ring, Token Ring Novell, IBM implementation, Ethernet, Sun microsystems, Ethernet Digital, Token passing, LAN Technologies, CSMA/CD, Access Methods, Transmission, Networks, The History of Local Area Networks, LAN