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Computer Networking
Computer networks are collections of computers which are connected together in order to communicate and transfer information. Questions about computer networks, networking protocols, and how to set them up belong here.
18,810 Questions
Why is a WAN more suitable than a LAN?
A LAN has a limited length for distance, and for the number of clients that may be connected to it. If you exceed either, then you may need a longer connection distance, which is afforded by a WAN.
Where can one find more information on a secondary DNS server?
On a computer running a Windows operating system, you can find your DNS Server Address by clicking Start> Settings> Network connections. Then double click on Local Area Connection. Now click the properties button and select Internet protocol. Click on properties and find Preferred DNS Server.
the data transferring between two nodes(transfer of data may be bw two PCs or bw a PC and mobile ,PC and networking device) depends on cable used in it.
mostly in today world data is transferred digitally i.e. in a streams of o and 1 only.
(for more info:see physical layer of osi network model)
various data transfer cables are:UTP cables,ethernet cables,coaxial cables.
Can someone hack you if you give out your mac address?
Short answer: It doesn't hurt anything.
If someone knows your media access control (MAC) address, there's not much malicious they can do. And anything that could be done would have to occur on the same network segment, i.e. from people physically close to you on the network.
At worst, someone could "spoof" your MAC address and make it look like you are doing things on the network that you aren't. They could also use that same technique to direct a ton of traffic to your machine that could make network communications difficult (called a denial of service or DoS attack), but again, they'd have to be local to your network.
You can change your MAC address on most machines/operating systems. Most users wouldn't have a need to do that. But the MAC address that's usually used is the one that's physically burned into the chips on the network interface card (NIC). And the silly thing is, even if you did change it in software, someone could quickly and easily listen to the broadcast of it to find the new (changed) address again.
What determines the data rate that a modem can support?
The bandwidth of the transmission media
The modulation encoding used
What is an example of a bottleneck effect?
A road with a lot of traffic on such as a motorway and that has four lanes has two lanes closed and thus the traffic piles up as there are four lanes of traffic trying to fit through two lanes. Like pouring water out of a bottle. When you tip it upside down the water sloshes over to the neck of the bottle but piles up and takes time to drain from the bottle rather than a bucket where the water is drained instantaneously.
What card must a computer have to connect to a network?
Depends on what type of local area network - the term is somewhat generic, as it can refer to anything from 802.11n wireless to Token Ring networks.
Generally, you'll need something called an NIC, or a network interface card. For ethernet (most wired networks), you need an ethernet card, or something that appears to have what looks like an oversized telephone jack on one side. Most computers these days include this, so check the back of your computer to make sure you don't already have one. If you don't, buy a USB ethernet adapter - they're not very expensive, and can be plugged into most computers with USB ports (same kind of port into which you might plug in a flash drive, looks like a rather flat rectangle). It should suffice as long as you're not doing anything exotic (intercepting network traffic, etc.) As for the vendor, Linksys if you can afford it, else it doesn't matter.
For wireless networks, you need a wireless card. Appearances vary, so it probably won't help you too much if I try to describe one. For most modern networks, you can use either an 802.11n (otherwise known as Wireless-N) card or an 802.11g (otherwise known as Wireless-G) card. There are a few more exotic networks type (802.11a, for example), but they're not seen often any more. Get the USB versions of those cards as well - they're much easier to install, and they'll suffice for most purposes. As for vendor, Linksys or Netgear if it's affordable, otherwise don't worry about it if you're using Windows (stick with Linksys, Netgear or SMC if using Linux - other vendors could give you headaches during configuration).
What is the difference between speed and bandwidth?
Difference between Internet speed and bandwidth
Internet speed and bandwidth are technically different. Bandwidth is referring the maximum amount of data that can be transmitted in a fixed amount of time through the network while speed is the time taken to reach the data (in form of packets) from source to destination. So we can see bandwidth is a fixed one while network speed can vary. Network speed depends on many factors like the protocol using to send data, server efficiency ,network conjunction etc. In practical life a
user feels the Internet speed by downloading certain files from server to his computer. Yes it is true high bandwidth really helps to download the file faster but there are some other factors are there. If he is downloading the file (consider a big
file like video) from a slow server, he feels his Internet speed is very less. Actually his Internet bandwidth is good enough but the speed of data transfer is limited by the response delay of the remote server.
Another factor really affect the Internet speed is the kind of protocol they use. The speed of data transfer vary depends on whether this connection is using a connection oriented protocol (TCP) or connection less protocol (UDP). As there is no error detection and synchronizing ,data transfer using UDP is always faster than the same in TCP. Here Internet bandwidth is a constant but the Internet speed vary.
So in a nutshell Internet speed and Internet bandwidth are different. Internet bandwidth is the one which is assigned by your ISP and which is a constant (as long as your ISP keeps its promise) while Internet speed vary with remote server and the
protocol they use to send data.
bandwidth is just a pipe and the speed is the amount of water that passes through...
byeeeeee.....
evanzdoh@yahoo.com
What are some Human Biology Devices in a computer input?
Finger print scanner, eye scanner (for high security area) ect.
What are the two ways to use the ping utility to test a local computers NIC?
go to command prompt and type in either
Ping Loopback, or Ping 127.0.0.1
or Ping another device's IP Address
Why do UTP and STP have twists?
STP - Shielded Twisted Pair is twisted to reduces crosstalk. Crosstalk is when the signal crosses wire and reduces the communication quality. Twisting the pairs reduces the signal transmission to other wires in the cable "pack". Twisting them increases the length the cable can be run. Category 5 has a usable length of 100m, 330ft.
Explain what the count-to-infinity problem is with distance vector routing?
I am not too good with the details yet but here is what I know...
In the distance vector routing algorithm, when the link cost for any link drops this good news travels very fast. But when the link cost for any link increases, this bad news takes many iterations of the algorithm to travel. This problem that the distance vector algorithm has with propagation of bad news is called the count to infinity problem. When I learn more about the details of this, I would come back to this page and add more details.
oh btw, I found this great link for a short explanation See related links
You might also want to check out poison-reverse and horizon-splitting
Which data communication method is used for sending data in both directions at the same time?
Full Duplex
What is faster LAN or Wireless?
LAN is a collection of computers with in certain distance say, a building or premises or within a city. A LAN can be a collection of wired computers or wireless computers or mixed. A wireless connection is a connection which uses radio frequencies to send and receive data, e.g. a mobile phone is an application based on wireless connection.
What are the advantages of using twisted-pair cabling over fiber on a network?
I believe it has the benefit of avoiding "cross talk" from the wires near each other, the twisted pair makes it less likely.
I think it also has the benefit of having two wires on one connection for more potential through-put?
What is the latest trend in computer network?
There are three major trends driving the future of communications and networking:-Pervasive Networking-The Integration of Voice, Video and Data-New Information Services
Pervasive Networking
In the future, communications networks will be everywhere.This pervasive networking means that virtually any computer will be able to communicate with any other computer in the world.This will increase telecommuting in which employees perform some or all of their work at home instead of going to the office each day.
Cellular telephone networks will begin to compete directly with the current wired telephone network.Pervasive networking will also increase the use of electronic data interchange (EDI), the paperless transmission of business documents between companies.The Internet has experienced such rapid growth that it now connects millions of computers in virtually every country in the world.
What is the difference between dhcp server and dns?
DHCP is Dynamic Host Configuration Protocal. It assings IP addresses to the needed computers in a network dynamically.
DNS is Domain Naming System(Service) It is system for naming computers and network services that is organized into a hierarchy of domains. DNS naming is used in TCP/IP networks, such as Internet, to locate computers and services through user friendly names.
What devices are used in an ATM network?
ATM Devices
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An ATM network is made up of an ATM switch and ATM endpoints. An ATM switch is responsible for cell transit through an ATM network. The job of an ATM switch is well defined: it accepts the incoming cell from an ATM endpoint or another ATM switch. It then reads and updates the cell-header information and quickly switches the cell to an output interface toward its destination. An ATM endpoint (or end system) contains an ATM network interface adapter. Examples of ATM endpoints are workstations, routers, digital service units (DSUs), LAN switches, and video coder-decoders (CODECs). Figure 20-3 illustrates an ATM network made up of ATM switches and ATM endpoints.
Figure 20-3: An ATM network comprises ATM switches and endpoints.
http://www.pulsewan.com/data101/images12341.gif An ATM Network consists of an ATM switch and ATM end systems.
Where can one buy a cheap serial to Ethernet cable?
A cheap Ethernet cable and other computer cables can be purchased from any local electronic or computer supplies store. One can also obtain it from retailers like Amazon, Newegg or Best Buy. They are even available at Walmart and Staples.
== To do this, follow these steps: # Start Internet Explorer. # In the Address bar at the top of the browser window, enter one of the following addresses: #* http://www.microsoft.com #* http://www.msn.com #* http://support.microsoft.com If you do not receive a similar error message after you enter one of these addresses in the Address bar, contact the owner of the Web site where you see the problem. The site may be temporarily offline or experiencing other issues.
If you receive the same error message, go to the next method. == To do this, follow these steps: # Start Internet Explorer, and then try to access the Web page that is displaying the error message. # On the page that displays an Internet Explorer error message, click the '''Diagnose Connection Problems link. The Network Diagnostics tool will run. When the tool has finished running, it will report one of the following results:''' #* It was unable to find a problem. #* It has detected a problem. Additionally, the tool will provide guidance about the next steps to take to troubleshoot the problem. Note Internet Explorer 6 users click Detect Network Settings
# Click '''IP Address, and note the IP Address. You may need it for future troubleshooting.''' # Follow the steps in the Network Diagnostics tool to fix any connection problems. # Start Internet Explorer. If you receive the same error message, go to the next method. == To do this, follow these steps: # Disconnect the cable that connects the computer to the modem. # Turn off the modem and the router.
Note If the modem or the router does not have a power switch, disconnect the power to the modem or to the router.
# Restart the computer. # After your computer has restarted, turn on the modem or the router, connect the cable from the computer to the modem or the router, and restart the computer. # Make sure that all network cables are securely connected. # Start Internet Explorer. If you receive the same error message, go to the next method. == If resetting the modem or the router did not resolve the problem, deleting your browsing history might help. Follow these steps to remove your temporary Internet files, history, and form data: == # Start Internet Explorer. # On the '''Tools menu, click '''Delete Browsing History.'''''' # Select the check box next to '''Temporary Internet Files.''' # Select the check box next to '''History.''' # Select the check box next to '''Form data.''' # Select the check box next to '''Cookies.''' # At the bottom of window, click '''Delete.''' # Close Internet Explorer, start Internet Explorer again, and then try to access the Web page. == # Start Internet Explorer. # On the '''Tools menu, click '''Internet Options.'''''' # In the '''Temporary Internet Files section, click '''Delete files, and then click to select the '''Delete all offline content text box and click '''OK.'''''''''''' # In the '''History section, click '''Clear history, and then click '''Yes.''''''''' # Close Internet Explorer, start Internet Explorer again, and then try to access the Web page. If you receive the same error message, go to the next method. == To do this, click '''Start, point to''' All Programs, point to '''Accessories, point to '''System Tools, and then click '''Internet Explorer (No Add-ons). '''''''''''''''
Note Internet Explorer (No Add-ons) mode is only available for Internet Explorer 7 and Internet Explorer 8.
If this resolves the issue, follow these steps to isolate the browser add-on that is causing the issue: # Click '''Tools, and then click '''Internet Options.'''''' # Click the '''Programs tab, and then click '''Manage add-ons.'''''' # Click an add-on in the '''Name list, and then click '''Disable.'''''' # Repeat step 3 until you identify the add-on that is causing the issue. Solution: 1: Create restore point and take registry backup.
2: Delete all temp files.
3: Delete all unwanted software's and security software's from add/remove program.
4: Disable all unwanted services from startup and then remove from registry.
5: Reset internet explorer and then register all .dll files.
6: Scan with spyware removal malwarebyte,hijackthis and trojon removal.
7: Check windows update if found and then download and install.
8: Defrag C: drive
9: Restart the computer, and then check it.
Which port is often used for an external modem or a serial mouse?
it can be usb, or PS/2
usb is better more commen and newer, faster and works on any windows PC that has usb
PS/2 is older but still works, less commen, used on all windows computers that don't use usb. e.g. windows 98
What restricts traffic onto network?
Firewalls restricts traffic onto a network or onto an individual system. Firewalls can restrict users, web sites, and files from being moved across the network.
