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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
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ARP is used to find a MAC (layer-2) address, if you know the IP (layer-3) address.First, a device will search its ARP cache, to see whether it already happens to have the required address.
If it doesn't find the address, it will send an ARP request as a broadcast, which basically asks "Who has such-and-such an IP address?"
The machine that has the requested IP address will send an ARP reply.
When was the first computer network created and by whom?
Contributions to computer networks were made by the following:
CERN in Switzerland
The first computer network was created at CERN the European research center for particle physics. it is in Switzerland.
UCLA in 1969
The previous comment "the first computer network was created at CERN" is not correct. In 1989, CERN added the WWW as a new feature to the already-existing Internet. The Internet itself was created in 1969 at UCLA. There were previous experiments in wide-area networking, e.g., in 1965. For more info, see "history of the internet" on isoc.org.
DARPA
The computer networking revolution began in the early 1960s and has led us to today internet technology. The Internet was first invented by DARPA (Defense Advanced Research Projects Agency) for military purposes, and then expanded to the purpose of communication among scientists. In 1957, the launch of Sputnik had spurred the U.S to create a network for communications links between military and university computers that would not be disrupted by bombs or enemy spies. In order to solve the problem, in 1968 DARPA (Defense Advanced Research Projects Agency) made contracts with BBN (Bolt, Beranek and Newman) to create ARPANET (Advanced Research Projects Agency Network).
Sergei Lebedev in the Ukraine
The first computer network in Ukraine by Sergei Lebedev for the USSR antimissile system. The system was operational in 1960 far before the idea of ARPANET.
SAGE air defence computer network
A network of vacuum tube computers connected by leased telephone lines and the first MODEMs used by the US to protect against bomber attacks. The system was operational in 1958.
What is addressing in networking?
The Logical address is what we assign to the Network device to identify. for example IP Address.
How many separate parts does a single duplex have?
A single duplex typically consists of two separate living units or apartments, each with its own entrance, kitchen, bathroom, and living spaces. These units are usually side by side or stacked on top of each other, sharing a common wall. Thus, a duplex has two distinct parts, allowing for independent living while still being part of the same building structure.
Assuming no subnetting what are valid Class B host addresses?
A classful class B network has a network range of 128 - 191. For host addresses, anything that is legal for an IP address in the last 2 octets would be a valid host address for a class B with no subnets.
acct reconciliation packaging-it's business software, others use the name to help other businesses manage themselves better
Function of input and output devices?
whow to give your thougts and what u want to get for ur thougts iscalld inputs
What is port forwarding in networking. What is the main purpose of port forwarding in router?
Well Port Forwarding is really only, opening ports and making them special to let a one connection on it. The main purpose for me is for gaming, you need to port forward for a game to run a dedicated server if the game allows, like Quake 3 arena, or GTA's, or Call of Duty's ect.
Why do most network use distributed processing?
The basic idea of using a network is to share resources; therefore, by its very definition you are using a form of distributed processing. There is no way around that, because when you share resources you are distributing the information, this way across a network.
The main purpose of SMTP is to deliver messages to user's mailboxes. A very similar service provided by some hosts is to deliver messages to user's terminals (provided the user is active on the host). The delivery to the user's mailbox is called "mailing", the delivery to the user's terminal is called "sending". Because in many hosts the implementation of sending is nearly identical to the implementation of mailing these two functions are combined in SMTP. However the sending commands are not included in the required minimum implementation (Section 4.5.1). Users should have the ability to control the writing of messages on their terminals. Most hosts permit the users to accept or refuse such messages. The following three command are defined to support the sending options. These are used in the mail transaction instead of the MAIL command and inform the receiver-SMTP of the special semantics of this transaction: SEND <SP> FROM:<reverse-path> <CRLF> The SEND command requires that the mail data be delivered to the user's terminal. If the user is not active (or not accepting terminal messages) on the host a 450 reply may returned to a RCPT command. The mail transaction is successful if the message is delivered the terminal. SOML <SP> FROM:<reverse-path> <CRLF> The Send Or MaiL command requires that the mail data be delivered to the user's terminal if the user is active (and accepting terminal messages) on the host. If the user is not active (or not accepting terminal messages) then the mail data is entered into the user's mailbox. The mail transaction is successful if the message is delivered either to the terminal or the mailbox. SAML <SP> FROM:<reverse-path> <CRLF> The Send And MaiL command requires that the mail data be delivered to the user's terminal if the user is active (and accepting terminal messages) on the host. In any case the mail data is entered into the user's mailbox. The mail transaction is successful if the message is delivered the mailbox. The same reply codes that are used for the MAIL commands are used for these commands.
What happens when you Bridge WAN with a LAN?
LAN users get access to internet or can communicate with others LAN connected to WAN.
Wikipedia at http://en.wikipedia.org/wiki/HUP has all serious kinds of meanings of HUP
The Dutch people say Hup Holland Hup! which means Go Holland Go!
Common way of sharing resources on a peer-to-peer network is modify by?
Modify the file-sharing controls using the computer's operating system
