advantage and disadvantage between :WLAN,3G,Interanet and PDA?
816625
Surely you cant compare\n\nWLAN is a type of network not restricted to one geographical area, an example of it is the Internet as well as 3G (but more focused on mobile/cell phones).\n\nPDA is a type of a handheld computer, so what ways can you say WLAN has an advantage over PDA and vice versa?
1171866
Its better to have VLANs and interconnect them via routers or Layer 3 switches.\n\nIts not good to have isolated islands for each dept or area, since nowadays resources like internet bandwidth have to be shared among multiple users and locations.
394868
Advantage is handy, everywhere oso can connect and is fast speed somore... \nDiadvantages is line sometime not stable enough, might disconnect due to weather conditions and environment issues.
810317
The capacity of 802.11(a,b, or g) systems is limited by two main factors; 1) The capacity of the DHCP Server and router and 2) the available bandwidth of the radio interface.\n\nThe typical residential wireless router has a built-in DHCP server to automatically assign wireless (and wired) users an IP address.  Residential DHCP servers usually max out at 256 users.  Enterprise wireless networks use dedicated DHCP servers capable of handling 1000s of users.\n\nThe next limitation is the radio link.  As you know, 802.11g supports link rates up to 54 Mbs.  54 Mbs is achievable only under the best conditions, meaning no other access points or users on the same channel in the area to generate noise.  \n\nAs users are added, the maximum rate available to each user is lowered accordingly, until the number of users are generating more noise than usable signal and effectively jam the access point.\n\nAnother factor in radio capacity is called Near-Far affect.  This occurs when one user has acquired service at a great distance with no interference.  Then a second user, located much nearer to the access point, acquires service and the Near users strong signal over powers the Far users weak signal, effectively jamming the Far users and reducing the access point capacity.
365054
1) Cost of installing wired connections is much more than that of wireless\n\n2) Greater access to the intranet/internet.
785066
Advantages being that when it works its wonderfull. The quality is really impressive and it works just like a phone. However, if you have a slow or unreliable connection it can cut you off a lot. Sometimes there are problems getting it to connect, and that can be rather frustrating.\n\nIn other words, when it works its great but sometimes it doesnt work
1151292
802.11b and 802.11g both work under the 2.4ghz frequency range.  This means that they are inter-operable with each other.  All 802.11g devices can communicate with 802.11b devices.  The advantage of 802.11g is that you will be able to transfer files between computers or networks at much faster speeds.  \n\nIf you are using your wireless connection to transfer files around the home or office, whether it be data files, music, video, or voice, you want to go with the 802.11g.  With the home audio and theater moving to wireless networks, you want to be sure to have an 802.11g network setup in your home.  \n\nThis standard also allows for some manufactures to have devices working at speeds  up to 108mbps, which is recommended if you plan to transfer large data or audio files within your LAN.
692657
wireless application protocols (WAP), 3g, gprs etc... mostly using gigahertz frequencies under environmental health spectrum, around 3.5GHz.... these spectrum also covers radio waves and microwaves, some transmitted via satelites.
608
Many organizations utilize wireless local area networks (WLAN) because of their convenience. The trade-off made is convenience for speed. Today’s most advanced wireless standard, IEEE 802.11g, operates at roughly half the speed of the most common 100 Mbit/s wired LAN. The Institute of Electrical and Electronics Engineers (IEEE) began to address this speed differential in the middle of 2003. Their vision was IEEE 802.11n, which would provide speeds equal to or greater than 100 Mbit/s LANs. Their work has yet to be completed. The lack of approval has led some to release so-called Pre-N equipment, which seeks to give the benefits of the 802.11n standard without an official standard. Because there is no official standard, implementing these products has future implications to customers.\n\n\nStandards\n\nStandards are made for very specific reasons. Foremost, they ensure that devices can operate with devices made by other manufacturers. Essentially, when a company releases a product before the ratification of the standard, they must infer what the IEEE is going to set. These inferences mean that the product may be incompatible with the final standard. If this does occur, an organization may be locked in to purchasing only identical hardware to that which they own. This would ensure compatibility.\n\n\nImplications\n\nAnother possibility if incompatibility exists is the release of an upgrade. The company would not be required to release updates, but if it did, there would be considerable work for the support groups. This may include individually upgrading each device, a very time consuming proposition. Despite the time commitment, an upgrade would be the most responsible course of action for the company because the customers would be able to choose any 802.11n solution for their purposes.\n\n\nImplementation\n\nIf an organization chooses to implement the Pre-N technology, the theory is the same as previous wireless network implementations. The setup would most likely begin with a router. This would be hard-wired to the Internet connection. There are also wired ports on the rear of the router. These allow any wired device to be included on the network. The router would then provide access to any device in its range with a compatible network interface card (NIC.) Currently, NICs exist for both desktop computers and notebook computers.\n\n\nAdvantages/Conclusions\n\nThe advantages to using this technology are clear. It will allow computers to connect easily to wireless networks, without sacrificing the speed possible with a wired connection. Another concern that comes up is that gigabit Ethernet is also available. If an organization were to implement this, 802.11n would again be just one-tenth of the speed. The implementation of any wireless network must be carefully considered. Regardless of which standard is followed, the security threats are common. Data is still being broadcast over radio frequencies. Before deciding whether to use Pre-N technology, one must first decide whether wireless is appropriate for their application. Only then should 802.11n be considered.
292619
Security! \n\nSecurity should be a big part of any presentation concerning wireless connectivity.\n\nAdditionaly you could discuss its uses (RFID, networking, etc...)\nCost\nInfrastructure comparison to wired connectivity\nAccess
5688
Google Talk is great.\n\nThe sound quality is great and the ease of use is even better. Google's take on VoIP - simple and useful.\n\nAlso, Google just released the API for GTalk so 3rd Party programs will start to appear making GTalk even more useful. \n\nFinally, since it is so small (less than a MB) go ahead and try it. It isn't meant to compete with AIM or MSN Messenger, instead use it for the great quality and ease of use.
230513
What kind of network are u using?
409419
I would suggest an Airport. Since its from Apple, you can probally set up yourself without a whole lot of problems. But almost any router will work. And most have the same range. I have a Netgear in my house (which is also 3 stories) and we have never had a problem with picking up the signal. I can even take my computer outside and use it. The only thing that will change is the signal strengh. That depends on what your house is made of. If its brick, you won't get as stong a signal as a house made of wood. But with a broadband connection, it won't be a big enough differnce to matter much. Again, I would just go with the Airport because it's from Apple.
358332
It is not depend on the compact flash type,\nYou need a software to do that and your PDA should support GSM.
411610
There are entire books published on wireless security, but here's all you need to know for your home WiFi LAN: WPA2-PSK.  In most cases, WPA refers to pre-standard stuff, while WPA2 refers to the properly implemented IEEE 802.11i security standard.  The PSK is for Pre-Shared Key, which means you will configure the same password/passphrase on all of your equipment.  If your router or access point and wireless interface cards support WPA/WPA2, this is what you should be using.  If you have older equipment that does not support WPA/WPA2 then at least turn on 128-bit WEP.  WEP has known weaknesses (at any key length) and can be "easily" broken.  In reality, while the encryption itself might be easy to break, it's beyond the desire or capability of the average home user.  Try it sometime.  It takes a bit of work.  Basically, I like to say that WEP will keep your honest neighbors honest.  If you are using WEP, change your key once a month or once a week, just to piss off anyone who has cracked your key so they'll have to break it again and they will give up.  WPA or WPA2 will make you bulletproof in the average neighborhood or apartment complex.  Make sure that you choose a decent length password for the WPA pre-shared key.  They can be up to 63 characters long, the longer the better.  Finally, don't forget to use wireless MAC address filtering too.  You put the 48-bit MAC address from your computers into the access point so it will only allow those devices to communicate with it.  Get your MAC addresses typically using the "ipconfig /all" on a PC or "ifconfig -a" on most Unix boxes.  Lastly, change the default password on your router, and disable any type of remote management options.  One more thing, you can also disable SSID Broadcast, but this is not really meant to be a security feature, it's more to prevent accidental associations, and your neighbors wouldn't "see" your network, unless they knew how to look for it.  And of course, nothing is 100% secure, so also be sure to have your computers protected with the latest security package that has at least a personal firewall and virus scanner, such as McAfee SecurityCenter or Norton's.
14606
3rd gen and 2nd gen? wtf is 3g and 2g????
553444
I agree with the first answer.\n\nyou have to consider:\n-topography of location (is the area surrounded by mountains, or is the location a 'free-space' type?)\n-type of network to be built (wired or wireless?)\n-distances of endpoints (if you're opting for wireless)\n\nfor your reference: