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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
What acts like a locked door on a computer?
Seriously, people, you really gotta try to make the questions more specific. I can, once again, only guess at your true intent, but I'd guess you're talking about a Firewall, which is used to block certain types of data transfers (by port, by app, by protocol, or other criteria, as well as combinations of those criteria) to help keep your data safe and secure.
Unless you're talking about locking your machine, like when you walk away from the computer for a moment, to keep people from getting into it.
Or if you're talking about some external theft prevention device.
Specific is good. Broad, sweeping question that could mean any number of things, bad.
Advantages and disadvantages of server based networks?
Local area networks can come in two forms (or architectures), peer-to-peer networking and server-based networking. Each have their advantages and disadvantages and may be used in different situations.
Peer-to-peer networkingIn peer-to-peer networking each computer has an equal status, each can use resources such as printers and scanners from other workstations and can commuicate with the other workstations without going through a server. Peer-to-peer networking is best used when there are only a small group of computers which do not require regular access to the data stored on the other work stations. Advantages- Easy to set up and maintain
- Inexpensive
- Will continue to operate if one of the workstations or resources malfunctions
- Because the files are stored locally on each workstation they can only be accessed by others when that workstation is turned on.
- No central control over security or backups. Every resource and workstation may have a different password.
- Only works well with a small number of computers
- Can easily cope with thousands of users.
- Backup, security and account control are all central.
- Software can be shared between the computers.
- If one of the servers go down all the users are affected and it may even bring the whole network down.
- More expensive to setup and maintain.
What is the name of the process of romoving the OSI layer 2 information from an IP packet?
Decapsulation
Is there a router that connects both wire and wired devices?
Yes, you can.
Many websites can give you specifics on how to do this. I have found a good discussion forum over at verizon.com and in the residential fios internet discussion forum. Since I use Netgear products I have also found good information there also.
Example. I've recently bought a 2nd router and only want to use it for the wireless devices in my home office. I want to use the 1st or main router that is connected to the internet as a wired router only since it is closest to all my wired devices.
Here is where you need the specifics on how to set up each router and these websites I mentioned will help you with this information. Getting familiar with the terms or options that are used in the router configuration will be most helpful. At least that's what I'm finding out. Now I've got to find the option to turn off the radio wireless section of my 1st router. This is also an option as I may want to leave the wireless turned on with the 1st router but for now I want to experiment with using the newer router with wireless only as it has the latest 'N' or 5ghz frequency used and I plan on using USB N wireless dongles to upgrade my laptops to the faster frequency band.
So, now, I've read where I have to set the 2nd router up whereby the wired IP port addresses don't interfere with one another or I could have problems. Once I figure that out then I only need to plug the cat5 or ethernet cable from one lan port of the 1st router and then to a lan port of the 2nd router. In effect, bridging routers.
So, now that I've got you confused, go forth and seek out more help and don't be afraid to experiment to see what works. You can always push the default button on your routers and this will reset them back to factory settings as before. Or, maybe you'r a little more advanced and have been logging into your router and found out how you can backup your configuration settings to your pc in a folder somewhere and then just as easily load the configuration file back to the router. This, only if you've made some changes you'd like to keep that you've made in the past and are now your default settings. Good luck, and please, anyone, take the time to add to the discussion area here if you find out more information on any of this for the rest of us. It seems to be a new and challenging subject for the most of us and it's only going to get worse in the future as we add more and more devices to the internet.
Gigabit Ethernet : 1Gbps // ATM : 25, 45, 155, or 622 Mbps // Cable Modem : 512 Kbps to 5 Mbps // SDSL : Up to 2.3 Mbps // ISDN : 64 Kbps to 128 Kbps
Telephone Lines : 56 Kbps
The question states SLOWEST TO FASTEST so it would be in reverse order:
Telephone lines: 56kbps, ISDN: 64 Kbps to 128 KBps, SDSL: Up to 2.3 MBPS, Cable Modem: 512 Kbps to 5 Mbps, ATM: 25, 45, 155, or 622 MBps and Gigbit Ethernet: 1Gbps
What services does Hughes Network Services provide?
Hughes Network Services provides broadband satellite services for both home and office in the U.S., Europe, Brazil, India and China. Hughes provides high speed satellite internet with its technology footprint covering the globe.
What is unguided communication media?
The unguided media is the wireless media. It simply transports electromagnetic waves without using any physical conductor. Signals are normally broadcast through the air and thus are available to any one who have in this range and able to accept and decode that signal.
What is the purpose of an access point?
The function of a wireless access point is to allow wireless devices such as projectors, laptops and PDAs to access a local area network. Wireless access points mainly act as switches to spread connections wirelessly. The difference between an access point and a router is that access points do not assign IP addresses nor do they have firewalls; they only lock out traffic that does not have the wireless key.
What are different data transmission mediums?
Physical media is a type of communication medium. Mostly thought in information technology classes
What is the purpose of a network model?
we use the network models in the computing because there are many networks
but we use only a particular type of net work model . eg.. lan
What is the vast network of computer networks?
Computer network : A collection of computing devices that are connected in various ways in order to communicate and share resource. Usually, the connections between computers in a network are made using physical wires or cables.
What jobs have been replaced by computer technology?
They have been a benefit - and - a hinderance. On the benefit side... they've made manufacturing much faster and more accurate. On the other hand... they've automated a lot of systems - which has made many people redundant.
Why is TCP IP often called a protocol stack rather than a protocol suite?
The protocol stack used on the Internet is the Internet Protocol Suite. It is usually
called TCP/IP after two of its most prominent protocols, but there are other protocols
as well. The TCP/IP model is based on a fi ve-layer model for networking. From
bottom (the link) to top (the user application), these are the physical, data link, network,
transport, and application layers. Not all layers are completely defi ned by the
model, so these layers are "fi lled in" by external standards and protocols. The layers
have names but no numbers, and although sometimes people speak of "Layer 2" or
"Layer 3," these are not TCP/IP terms. Terms like these are actually from the OSI Reference
Model.
The TCP/IP stack is open, which means that there are no "secrets" as to how it
works. (There are "open systems" too, but with TCP/IP, the systems do not have to be
"open" and often are not.) Two compatible end-system applications can communicate
regardless of their underlying architectures, although the connections between layers
are not defi ned.
The term "protocol stack" is often used synonymously with "protocol suite" as an
implementation of a reference model. However, the term "protocol suite" properly
refers to a collection of all the protocols that can make up a layer in the reference
model. The Internet protocol suite is an example of the Internet or TCP/IP reference
model protocols, and a TCP/IP protocol stack implements one or more of
these protocols at each layer.
How does a modem enable internet access?
The modem changes the files into a series of impulses that can be transmitted across the chosen medium, and then another modem can decode the impulses and reconstruct the file. Modems connect your computer to the internet, where it finds the file that you're viewing on a server and then decodes it and places it on your screen. =)
How do you find your router port number?
In linux, issue the following command in the terminal.
lsof -i TCP | fgrep LISTEN
Or
do a port scan using a port scanner like nmap
ex: nmap
In Windows, you can do a port scan to get the list of open ports in your computer. For this use, nmap or zenmap (gui of nmap). There could be other ways but this is the one I have experience on.
What is an allocated IP address?
An allocated IP (Internet Protocol) address is the IP address your ISP (Internet Service Provider) gives you. When you connect to the Internet, this is what you use to connect to websites and is also a unique identifier (although it changes every so often, unless your ISP gives you a static IP rather than dynamic).
What is the purpose of configuring a switch port as a trunk port?
The idea of configuring a switch port as a trunk port is to allow the switch to receive and send data from several VLANs on a single port. Otherwise, a separate port would be required for every VLAN, if, for example, you want to connect two switches among themselves.
The idea of configuring a switch port as a trunk port is to allow the switch to receive and send data from several VLANs on a single port. Otherwise, a separate port would be required for every VLAN, if, for example, you want to connect two switches among themselves.
The idea of configuring a switch port as a trunk port is to allow the switch to receive and send data from several VLANs on a single port. Otherwise, a separate port would be required for every VLAN, if, for example, you want to connect two switches among themselves.
The idea of configuring a switch port as a trunk port is to allow the switch to receive and send data from several VLANs on a single port. Otherwise, a separate port would be required for every VLAN, if, for example, you want to connect two switches among themselves.
Networks allow users to share what?
Networks are, by definition, a mechanism that allows users to share files with each other; the only additional requirement is that each user that wishes to share data must be using compatible protocols.
What is rollover cable for on Cisco router?
A rollover cable is used in a networking environment where a router/switch is to be configured from a computer. One end is wired one way but on the other it is reversed. You would typically use one end into a serial port on a PC and the other into the console port of the switch/router. It is common within cisco configurations.
Hope I helped
asp.net
vb.net
Technologies used for web site design
HTML provides the basis for creation of web pages.
Photoshop is software which is used for image editing.
Flash for creating presentation.
CSS helps creates uniformity across the entire web site.
Javascript provides certain user interface controls.
WordPress provides templates for websites.
What are the basic principles of computer networks?
nodes that are connected together.
Nodes are units that can process/save(store)/send, receive data.
Example: workstations, servers and hubs/switches that connect the server and workstations all are nodes.
The network is made to
- share data files (pictures documents)
- share applications (programs which can be run from the server or from the client/workstations)
- share services like internet connection
How do you connect end systems to edge router?
through:
residential access nets
institutional access networks (school, company)
mobile access networks
A network card, network adapter, network interface card or NIC is a piece of computer hardware designed to allow computers to communicate over a computer network. It is an OSI model layer 2 item because it has a MAC address. Every network card has a unique 48-bit serial number called a MAC address, which is written to ROM carried on the card. Every computer on a network must have a card with a unique MAC address. The IEEE is responsible for assigning MAC addresses to the vendors of network interface cards. No two cards ever manufactured should share the same address. Whereas network cards used to be expansion cards to plug into a computer bus, most newer computers have a network interface built into the motherboard A separate network card is not required unless multiple interfaces are needed or some other type of network is used. The card implements the electronic circuitry required to communicate using a specific physical layer and data link layer standard such as ethernet or token ring. This provides a base for a full network protocol stack, allowing communication among small groups of computers on the same LAN and large-scale network communications through routable protocols, such as IP. There are four techniques used for transfer of data, the NIC may use one or more of these techniques. * Polling is where the microprocessor examines the status of the peripheral under program control. * Programmed I/O is where the microprocessor alerts the designated peripheral by applying its address to the system's address bus. * Interrupt-driven I/O is where the peripheral alerts the microprocessor that its ready to transfer data. * DMA is where the intelligent peripheral assumes control of the system bus to access memory directly. This removes load from the CPU but requires a separate processor on the card. A network card typically has a twisted pair, BNC, or AUI socket where the network cable is connected, and a few LEDs to inform the user of whether the network is active, and whether or not there is data being transmitted on it. The Network Cards are typically available in 10/100/1000 Mbit/s. This means they can support a transfer rate of 10 or 100 or 1000 Mbit/s.
