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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
Local Area Network
Define circuit switching and packet switching what are the difference of them?
Packet-switched networks move data in separate, small data blocks, or packets as they are more commonly known, based on the destination address in each packet. When received, the packets are reassembled in the proper sequence to make up the message. The packets are not dependent on any one path or connection, and can take as many paths as necessary to maintain data integrity depending on traffic load of a shared network. Packet-switched networks are mainly used in standard LAN networks.
Circuit-switched networks require dedicated point-to-point connections during calls.
the Application Software is a software that APPLIES to the real life application. For example: Microsoft Word is used to create documents similar to you create manually on paper. Accounting Softwares those are used for accounting which is simallarly done manually on Account Book.
Thus, Application Software are easier to be understood by normal users because they directly deals with the normal real life applications.
But the System Softwares are the softwares which deals with the system or hardware. For example: Disk Management Tools which are used to partition or format the disk.
System Softwares are recommended to be used only by Advanced users who are having advance knowledge of the computer system.
What is a group of computers and associated devices that are connected by communications facilities?
Client
What is the primary advantage of coaxial cable compared to twisted pair?
The primary advantage of coaxial cable compared to twisted pair is the braided metal shield is very good at blocking electromagnetic signals from entering the cable and producing noise. And has also been used for long-distance telephone transmission, as the cabling within a local area network, and as a connector between a computer terminal and a mainframe computer.
How to stop unauthorized access to your wireless router?
It's not "illegal" if your router is configured to grant them access to your network.
The law only prohibits "unauthorized access of a computer network". When someone uses their computer to request access, and your router grants access with no password, then their access of your network is authorized. I always configure my routers to share my connection with neighbors and visitors (in a secure way, of course).
If you enable WEP encryption, and they crack the encryption in order to access it, then it's illegal, because their access was unauthorized. But this only makes it illegal for them, it doesn't actually stop them. WEP is very easy to crack, and basically useless. Disabling SSID broadcast is also useless.
While WEP will certainly put you a step ahead of no security at all, if the neighbor is determined to use your wireless network they can break WEP encryption pretty simply using aircrack, a freely available tool. To really stop them, you need to use the stronger encryption offered by WPA or WPA2, which is available on all newer wireless routers. Then it is both illegal and difficult (if not impossible) for them to crack.
When enabling encryption, use a passphrase. It is MUCH easier to set up on other computers than it is to type 42 randomly chosen letters and numbers!
With the SSID changed from the default, broadcast of that name disabled and with the encryption set at 128, it will practically be impossible for your neighbor to get online by using yourrouter.
The neighbor may SEE your wireless network but will not be able to access it without the correct passphrase.
If you enable WPA you will have the option of using TKIP or AES encryption. Choose the stronger AES encryption if your router and client systems will support it. Although most neighbors will not be sophisticated to take advantage of it, there is an identified vulnerability in the TKIP algorithm for WPA for which exploits are available. You are better off using the AES encryption.,
What cable is NOT subject to electromagnetic interference or radio frequency interference?
Fiber-Optic
What layer of the OSI model provides the interface between the user and the data network?
The Transport layer is responsible for taking a message that is too long and breaking it into smaller segments to send out. The reverse is also true, when the information is received the Transport layer is responsible for taking a series of short segments and putting them together again. Hope this helps.
What would one use a punch down tool for?
A punch down tool is used for inserting wire insulation-displacement connectors on a punch down tool. It is a small hand tool that is used by network and telecommunications technicians.
How do you access Computer Management?
# Press WindowsKey+R # Type "compmgmt.msc" (without the quotes) # Press Enter
What is the purpose of an Ethernet Cable?
An ethernet adapter is the component that allows you to connect to your internet modem or computer network. Upon connecting your ethernet cable, you will be able to access the internet or computer network to which you are connected.
Examples for half duplex devices?
A phone is full duplex, both can speak and listen at the same time. A CB-radio is half duplex, ony one can speak at a time.
What are the advantages and dis advantages of optical fiber communication system?
Optical fiber communication systems offer several advantages, including high data transmission rates, greater bandwidth capacity, and immunity to electromagnetic interference, which enhances signal quality over long distances. Additionally, they are lightweight and have lower attenuation compared to traditional copper cables. However, disadvantages include higher initial installation costs, fragility of the fibers, and the need for specialized equipment and training for installation and maintenance. Overall, while optical fibers provide significant performance benefits, their adoption might be limited by cost and handling challenges.
Is the transmission medium a part of physical layer why or why not?
The Physical Layer defines the means of transmitting raw bits rather than logical data packets over a physical link connecting network nodes. The bit stream may be grouped into code words or symbols and converted to a physical signal that is transmitted over a hardware transmission medium. The Physical Layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes and properties of the electrical connectors, the frequencies to broadcast on, the modulation scheme to use and similar low-level parameters, are specified here.
Within the semantics of the OSI network architecture, the Physical Layer translates logical communications requests from the Data Link Layer into hardware-specific operations to affect transmission or reception of electronic signals.
How can you tell whether the printer has been shared?
To check whether a printer is shared or not go to devices on the computer and note whether the printer is listed for that particular computer. Do this for each computer in question.
How much does network security pay?
Payment varies depending on the size of the company, the nature of data being protected, the region of the country you are in.
It also depends on experience, and whether or not you have any certifications. I've seen starting salaries around 60K, going to more than 110K or even higher depending on qualifications.
What kind of topology is susceptible to signal bounce?
A Bus
Source: Page 195 Network+ Guide to Networks 5e
Why is it important to be regularly monitoring one's network bandwidth?
It depends on what type of connection your using. If your using a laptop on an unsecure router that you own, you may want to check your bandwidth to see if the neighborhood is glad you pay for internet so they don't have to. Otherwise I don't see the point unless you suspect a virus or spyware may be on your computer using up all your bandwidth.
What purpose does a network backbone serve?
The main pathway of high-speed communications lines through which all Internet traffic flows.
What kind of cable do you use to connect a computer to a network?
You would use a network cable to connect a computer to a network. The type of cable and its electrical, possibly optical, and mechanical attributes depend on the network's pysical layer.
Networks use a variety of fiber optic cables, coaxial cables, single twisted-pairs, double and quadruple twisted-pair cables. Other forms exist, including those not requireing a dedicated cable (such as some devices designed for networking over power line), or not requireing a cable at all (such as devices designed for networking over radio frequency connections).
1. Filter packets leaving your network with source addresses that do not originate inside your network. 2. Filter packets entering your network with a broadcast address for a destination
It can be POP3, IMAP4 and Microsoft Exchange.
