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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
Definitely, electronic devices should never be exposed to water!
How do wireless antennas share information?
they dont. An antenna is simply a piece of metal hooked to a device (normally a radio or a walkie-talkie). A receiver (for example, a radio) pick up electrical signals from the antenna, and a transmitter sends them to the antenna. They can be combined to form a transceiver which then sends and receives signals from the antenna.
What does a computer's operating system do?
A computer's operating system can be compared to an executive manager; it manages all of the hardware and software. It allows the user to access and modify files, use external devices, and run software.
What is remote frame buffer protocol?
The Remote Frame Buffer protocol is an application level protocol used by VNC applications to transmit information about the remote machine's desktop in order to re-create it locally. RealVNC explains the protocol here: http://www.realvnc.com/docs/rfbproto.pdf .
What is a cisco connection for the Internet?
A Sysco connection is a wireless connection that is found almost everywhere. If you play with the SEARCH FOR A CONNECTION option in internet settings while moving down the road you will find at least a dozen in a populated area.
you need an operating system to have a graphical user interface. without one your computer will just be like a full screen command prompt window and all you could do is type calculations.
also you would not be able to browse the internet, play games, watch or listen to movies photos and audio.
a computer would be boring without an OS
What is real time network monitoring system?
A real-time network monitoring system is a network monitoring system that features dynamic status of your nodes. Something like NetCrunch 8 features real-time displays that show you the status of your network, or the status of whatever network components you are looking at, in their current state, without relying on refresh buttons or limiting your data gathering.
How do you get the Sanyo pro xtrax projector to work with your laptop?
you can put a video-cable in the video port from your laptop with an adapter cable witch end in a tulip cable(yellow).
the (yellow) tulip cable is conected in the S-video in port section below the S-cable input.
if you can vind the adaptor witch end in a S-cable it,s better bud harder to vind.
the usb connection does not work without the driver,do not know were to find one.
What is the duration of comptia network exams?
90 minutes , but can also be given as an adaptive exam , where you would have something like a total of 16 questions . If you get one wrong , a series of more in depth questions are posed to see if you are knowledgeable in that regard .
What is the difference between desktop operating system and real time operating system?
Very easy. Desktop operating system is the base from all you use for write in word processors, internet browsing, gaming, etc, requiring time for processing instructions. Microsoft Windows or Debian GNU/Linux is an example.
The function of real time operating system is the fastest response time at the queries. His function would be, for example, push one key and instantly responds, without process necessarily instructions, or execute one command or utility without wait any time: practically instantaneous. His structure is simple for memory/disk/network access. The high performance cluster servers and supercomputers can use real time, but not necessarily. The OS most nearest for this instruction method is RTOS/360.
How do you install a network operating system?
When you install a network operating system (NOS), you have to make some decisions about how you want the operating system and its servers to be configured. Most of these decisions aren't cast in stone, so don't worry if you're not 100 percent sure how you want everything configured. You can always go back and reconfigure things. This is an overview of a typical installation of Windows Server 2003. Although the details vary, the overall installation process for other network operating systems is similar.
The method you use to begin the installation depends on whether the computer already has a working operating system:
* If the computer already has a working operating system, simply insert the Windows 2003 Setup disk in the computer's CD-ROM drive. After a moment, a dialog box appears, asking whether you want to install Windows Server 2003. Click Yes to proceed.
* If you're installing Windows Server 2003 from a network drive, open the My Network Places window, navigate to the shared folder that contains the distribution files, and run Winnt32.exe.
* If the computer doesn't already have a working operating system but can boot from a CD-ROM disk, insert the distribution disk into the CD-ROM drive and restart the computer.
* If the computer doesn't have a working operating system and can't boot from its CD-ROM drive, insert a bootable floppy disk that has CD-ROM support into the A drive and restart the computer. When the MS-DOS command prompt appears, type d: to switch to the CD-ROM drive (assuming drive D is the CD-ROM), type CD \i386 and then type winnt.
As the Setup program proceeds, it leads you through five distinct installation phases: Collecting Information, Dynamic Update, Preparing Installation, Installing Windows, and Finalizing Installation. The following sections describe each of these installation phases in greater detail.
Phase 1: Collecting Information
In the first installation phase, the Setup program asks for the preliminary information that it needs to begin the installation. A wizard-like dialog box appears to gather the following information:
* Setup Type: You can choose to perform a new installation or an upgrade.
* License Agreement: The official license agreement is displayed. You have to agree to its terms in order to proceed.
* Product Key: Enter the 25-character product key that's printed on the sticker attached to the CD-ROM disk case. If Setup says you entered an invalid product key, double-check it carefully. You probably just typed the key incorrectly.
* Setup Options: You can click Advanced Options to change the file locations used for Setup, but you should stick to the defaults. If you need to use accessibility features, such as the Magnifier, during Setup, click Accessibility Options and enable the features you need. In addition, if you want to change the language setting, click Primary Language and make your selections.
* Upgrade to NTFS: If you want to upgrade a FAT32 system to NTFS, you need to say so now.
Phase 2: Dynamic Update
In the next installation phase, Setup connects to Microsoft's Web site via your Internet connection and checks to see whether any of the installation files have been changed. If so, the updated installation files are downloaded at this time. If you don't have a working Internet connection, you have to skip this phase.
Phase 3: Preparing Installation
In this phase, the computer is restarted and booted into a special text-mode Setup program. After the Welcome screen appears, Setup proceeds through the following steps:
* Partition Setup: Here, you're asked to choose the partition that you want to use for the installation. You can reconfigure your partitions from this screen by deleting existing partitions or creating new ones. In most cases, you'll want to install Windows into a single partition that uses all available space on the drive.
* Delete Existing Windows installation: This screen lets you choose whether you want to delete your existing Windows installation or leave it in place. You should choose to delete it, unless you want a multiboot installation.
* Convert to NTFS: If you elected to convert an existing FAT32 partition to NTFS, the conversion will take awhile. This step is a good time to get a fresh cup of coffee.
* Copying Files: Now Windows copies its installation files onto your hard drive. This step also takes awhile.
Phase 4: Installing Windows
Now that the drive has been set up and the installation files copied, Windows Setup reboots your computer back into Windows mode and begins the actual process of installing Windows. You're taken through the following steps:
* Installing Devices: Windows automatically examines every device on the computer and installs and configures the appropriate device drivers. This step can take awhile.
* Regional and Language Options: In this step, you're asked to enter information about your region and language. If you're in the United States, you can accept the defaults. Otherwise, you can change the settings appropriately.
* Personalize Your Software: In this step, you can enter your name and your company name. Your name is required, but the company name is optional.
* License Modes: In this step, you choose whether you purchased per-server or per-device/per-user licensing. You can change this setting later, but you can change the setting only once. If you're not sure, double-check the invoice that Microsoft shipped along with the software.
* Computer Name and Administrator Name: Enter the computer name and Administrator account password here. Be sure to write down the password and keep it in a secure location. You'll be in serious trouble if you forget it.
* Date and Time Settings: If the date and time information is incorrect, you can change it here.
* Network Settings: In most cases, you can select the Typical option in this step to install the network features that are used most often: Client for Microsoft Networks, Network Load Balancing, File and Printer Sharing for Microsoft Networks, and Internet Protocol (TCP/IP). If you don't want to use these defaults, you can select Custom Settings and then configure these features yourself.
* Workgroup or Domain: Next, you're asked whether the computer is part of workgroup or a domain. Choose the appropriate option and enter the workgroup or domain name.
* Copying Files: Now Windows copies files, updates the registry, and ties up any loose ends. This step can take a long time, so you may want to go for a walk.
Phase 5: Finalizing Installation
To complete the installation, Setup saves your settings and reboots the computer one final time. When the computer restarts, press Ctrl+Alt+Delete to bring up the Log On dialog box. Enter the password you created for the Administrator account, click OK, and you're logged on.
Passwords
Passwords are the easiest and most common authentication process that are used, not only on desktop computers but also at the network level. However certain rules should be followed when setting a password for your computer or Network. Do not use easily predictable words for your passwords; they don't even require a hacker to access the system through your account. Use passwords that are unpredictable. Set long passwords and use numbers and special characters when setting your password. Remember your passwords; don't write it down anywhere. Hackers use various tools to know your passwords, but a long password with a number of special characters, indeed gives them a lot of trouble.
Digital Certificates
Using a certain algorithm, computer administrator combine your personal details with other user credentials to generate a public key. This public key or digital certificate is used for the authentication purpose in the network.
Smart Cards
Smart Cards are among the very few hardware authentication processes in which a simple card with an embedded circuitry is used for accessing the network. Each valid card for a particular network, when inserted into the circuitry it has been made for, gives an output which decides whether you will be allowed to enter into the network or not. The programming logic inserted into each card is different and it is one of the safest methods of authentication.
Fingerprint detection
Almost available in all laptops that are manufactured today; fingerprint detection is another safe method of computer security authentication. Everyone knows that even the iris pattern of two people may even match, but fingerprints can never match.
Face recognition systems
Face recognition system, may amuse you, but of late many people working in the field of security have questioned its user friendly nature and the security it can provide. A simple dimension calculation of the face is done by the computer and the logic used in doing so, has been often found to be prone to errors.
Biometrics
Biometrics is often considered as a far more secure way of authentication than passwords or digital certificates. It is even safer than smart cards, which may be misplaced. The physical and behavioral traits of a person are taken into consideration in this type of authentication.
Captcha Keys
This is the process of authentication that is used to verify whether a human or a computer bot has logged into the system. Captcha keys are randomly generated alphabets and numericals presented in such a form, that only a human can recognize.
Now, let's come down to the normal computer security authentical processes that we can do at the local level. Setting up a BIOS password for your computer may not be the ultimate security authentication. Removing the BIOS battery from the computer system for 30 seconds, deactivates this security feature. Setting up the administrator password is of utmost necessity. If the administrator password is not set, then any user can log into the computer irrespective of the fact whether he has an account in that computer or not.
The above listed methods are just a few of the widely used authentication methods. In fact, the measures that we take for safeguarding our computer or network are more important than the method itself. Many of us have a habit of naming our networks after the protagonist from our favorite movie. This should be avoided and networks should have sensible names that cannot be easily determined. If you are a network administrator in charge of a closed secure network, then it is always desirable to set your network visibility status to the invisible mode.
Importance of automata as a computer science student?
Automata, and the related concept of formal languages, is the core of theoretical computer science. They are where the notion of run-time complexity comes from, and are absolutely central to a complete understanding of algorithm design and optimization. While you can (and many people do) write programs without understanding automata and algorithm design, a solid understanding of them both will make you a much better programmer, and save you a lot of time and trouble when you try to work out how to make something run faster.
Which transfer method requires least specialized hardware on a PC?
Either Bluetooth, Wi-Fi or direct USB connection.
8 Which network protocol has the slowest transmission speed?
Local Talk is the network protocol that has the slowest transmission speed. Local Talk was developed by Apple Computer, Inc.
What is a core in a fiber optics?
A core in fiber optics is a single strand of fiber. It forms one half-duplex channel, where one transmitter can send data to one receiver. In order to form a full-duplex channel, two cores or strands are required. Many fiber optic cables contain many cores organized in many bundles.
What are the advantages of Class A network over Class B and Class C?
A class A network has more IP addresses - you can connect more hosts on it.
A class C network has 256 IP addresses (of which you can use 254), a class B network about 65,000, a class A network about 17 million.
More specifically, a Class A network can have 16,777,214 usable host addresses per network whereas a Class B network can have 65,6534 usable host addresses per network.
Another advantage is the ridiculous amounts of subnetting you can do. For example, in a Class C network, you can't borrow the same number of bits as you can with a Class A because you only have the last octet to work with for the host portion. With a Class A network, the last three octets are the entire host portion, so you have 24 bits to work with for subnetting (technically 23 since you can't subnet down through all available bits and have no bits left for hosts =p). Due to the amount of subnets you can have and the 16+ million hosts you can potentially have on the same network, Class A networks are reserved for super big applications (ISPs and gigantic companies).
Which two statements describe classful IP addresses?
The number of bits used to identify the hosts is fixed by the class of the network.
Up to 24 bits can make up the host portion of a Class C address.
a quadrilateral is a shape that that doesn't contain any curved lines or overlapping lines. you must be able to draw the entire shape without lifting your pencil and ending where you started drawing.
* * * * *
A hopelessly incomplete answer. A triangle would meet these requirements!
A quadrilateral is a closed plane shape enclosed by four straight lines (which meet, pairwise, at 4 vertices).
The shape is convex if all of its interior angles are less than 180 degrees. Equivalently, for every pair of points inside the shape, the straight line joining the points must lie entirely inside the boundaries of the shape.
Identify connectors and components of router?
Assuming a typical, home type router.
Usually a RJ11 (phone) connector - where the phone line connects
1+ RJ45 (LAN) connector(s) - for connecting computers and other network hardware
Power connector - for the power brick
Wireless antenna(e)/antenna connector - for providing a wireless signal
some may have a USB port
most have some form of physical reset button somewhere
CPU
Memory
Flash ROM
Various ICs that perform specific functions (e.g. handling the phone line, ADCs/DACs)
What are the advantages and disadvantages of personal area network?
Advantage is PAN users can move without much concern of their mobile devices I/O redundancies. Disadvantage is the PAN has limited transmission range about 10 meters.
What are the advantages and disadvantages of asynchronous transfer mode?
Go to this site http://homepages.uel.ac.uk/u0124452/MyPage/Advantages%20and%20Disadvantages%20of%20ATM.htm
Why optical fibers has large bandwidth?
Study the optical transmission property of glass, to learn more.
also:
http://en.wikipedia.org/wiki/Optical_fiber
You might wish to refine the question to differentiate between optical bandwidth and data bandwidth.
If a laser can be modulated and the beam directed through an optical fiber, then the data or the analog bandwidth is about equal to the modulation bandwidth capability of the laser in Hz per second.
Measurement of the capacity of a communications signal. For digital signals, the bandwidth is the data speed or rate, measured in bits per second (bps). For analog signals, it is the difference between the highest and lowest frequency components, measured in hertz (cycles per second). For example, a modem with a bandwidth of 56 kilobits per second (Kbps) can transmit a maximum of about 56,000 bits of digital data in one second. The human voice, which produces analog sound waves, has a typical bandwidth of three kilohertz between the highest and lowest frequency sounds it can generate.
Why is the web known as client server system?
When you enter a URL into your browser you are directing your computer to connect to a server that is listening at the corresponding ip address, which will then send you the HTML that makes up that web page.
Your computer is a client connecting to a server.
