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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

Who is a switch engineer?

A switch engineer is a specific type of engineer. This engineer is specifically used for controlling data transmission over systems with electronic switching.

What is a Ethernet switch used for?

Ethernet switches are used to make possible communication between different network meaning, switches create networks. Also switches use different mechanism of forwarding communication between computers as well as it does not share one channel for multiple computers.

What mechanism does ARP use to resolve IP addresses?

ARP is a Third layer or Network layer protocol. ARP is an address resolution protocol . The mechanism used by ARP to resolve IP address is look up table.

What is the best video card for desktop computer?

well it depends..mainstream computers usually only go up to the GEforce 8800 and ATI 4850...but if you want the best of the best..i'd say the GEforce 280 GTX i think its called...but dont quote me on that lol

What is gratuitous ARP?

Gratuitous in this case means a request/reply that is not normally needed according to the ARP specification (RFC 826) but could be used in some cases. A gratuitous ARP request is an AddressResolutionProtocol request packet where the source and destination IP are both set to the IP of the machine issuing the packet and the destination MAC is the broadcast address ff:ff:ff:ff:ff:ff. Ordinarily, no reply packet will occur. A gratuitous ARP reply is a reply to which no request has been made.

What are the disadvantage of network security?

Network security usually is not that simple to implement and support especially on industrial level. Also it costs a lot of money to have proper equipment.

What are the advantages and disadvantages of frame relay?

* Reasonable WAN speed (64kbps -- 1.5Mbps) * ** When T1 or Fract. T1 is the transport * Buy bandwidth only when you need it **** * One serial port at the central site can support multiple incoming PVCs * Telco is responsible for insuring connectivity

* No educational tariff is currently available in Alabama. * Full T1?s are almost always less expensive than Frame Relay (due to the edu. Tariff) * More difficult to configure and manage properly

What is requirement to do Computer firewalking?

Employs traceroute-like to analyze IP packet responses to determine gateway ACL filters and map networks.

How many virtual networks does VMWare support?

Technically 10 on VMWare Workstation - VMNet0 to VMNet9. However, VMNet0 is usually used for bridged networking, VMNet1 is usually used for host-only networking, and VMNet8 is usually used for NAT networking, so you actually have only 7 virtual switches for exclusive virtual machine to virtual machine networking. ESX Server may be different, however, as it supports the use of virtual routers and such, making things much more complicated.

Do lans connect groups of networks using isps?

I'm pretty sure LAN's are a group of computers connected to each other through routers/modems or ethernet cables. The internet it similar to LAN's but instead of connecting to other computers close by, it connects to computers all around the world.

Where can you create your own movie?

You can do this on Windows Movie Maker. Go to Google and type 'Windows Movie Maker download' to get it. It is free, but you need a video camera.

Why do you need different scripting for client and server side?

Partly because the available scripting languages are different: JavaScript runs primarily in the browser, which server side languages like PHP, JSP, Ruby on Rails etc. cannot do.

Partly because the tasks are different: The server may do things like database lookup, reading/writing files and user authentication that would be either impossible or very insecure to do in a browser.

That said, there are a number of tasks that can be done either on the client or the server, like generating the HTML for the page.
There are also a couple of tasks that are commonly done both places, like form validation - on the client to give quick feedback and on the server to ensure that what is submitted is actually safe and valid. (An attacker could easily skip any browser validation and submit illegal values.)

If you wish to share as much code between client and server as you can, server side JavaScript exists, so it is possible to use the same language both places. There will still be different scripting, as there are tasks that can only be done on the server.

See related link for some server side JavaScript options.

What is a computer network and why it is useful?

A computer network - is two or more computers linked together. It's useful - because computers can communicate 'live' with each other. Additionally - If computers are networked, you only need one printer. All the computers on the network 'share' the printer between them.

What is the difference between a network operating system and a client operating system?

Network Operating system or NOS is an OS that allows a system to connect to a network. Such as Novell and Artisoft's LANtastic. In the old days of DOS networking was not a function of the Client OS, you have to also load the NOS to get connected. Now that most Client OS's imbed network connectivity the term is now seldom used.

How do I close port 1050 on my Router?

There is a step by step guide (with screenshots) on how to fix this hole at the website below.

http://randompastime.blogspot.com/2010/01/netcomm-nb5plus4w-router-port-1050-open.html

**edited the previous post as it was very very long and essentially were cuts from forums. I think that it will be more useful if you have a direct guide instead of having a post that was simply a collaboration of other people's forum posts. I give my regards to the previous poster. Feel free to use the previous post if you believe that that was more useful.

Compare satellite and fiber optics communication?

Fiber optics is quicker and has higher bandwidth but for long distances requires more infrastructure (but it is on the planet so is more easily repaired).

Satellite communications is slower with lower bandwidth and noticeable delays, the long range capability is greater but parts of the infrastructure (the satellites) are very expensive to replace and repair.

How do you archive dynamic pages?

You can save (archive) a static copy of a dynamic page by using Ctrl+S (or CMD-S, or similar) to Save the HTML source and images of a page.