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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 is the most popular transmition media for wired Ethernet networks is?
CAT 5, CAT 5e or CAT 6, depending on whether you're building a new one, or just mean in general.
Give an example of a classful subnet mask give an example of a classless subnet mask?
Subnet masks that use either all ones or all zeroes in an octet are called classful subnet masks. 255.255.255.0 (11111111.11111111.11111111.00000000), 255.255.0.0 (11111111.11111111.00000000.00000000), 255.0.0.0 (11111111.00000000.00000000.00000000)
How many frequencies does a full-duplex QAM-128 modem use?
You are asking this question because you are trying to cheat on your homework!
What is the simplest network topology?
Linear bus topology is the easiest; there is practically no configuration to worry about except the wiring.
What are the benefits of replacing a hub with a switch?
Basically, with a hub each network card has to wait it's turn to transmit data, therefore its slower than a switch which allows them all to talk(transmit) at the same time switching the data stream directly to the ports that need to receive the data. The switch knows this by comparing the IP address to the MAC ADDRESS of the card, making a switch a lot more intelligent than a hub.
What are the advantages and disadvantages of a serial port?
Having a serial port allows you to plug more stuff in you computer. i think The serial technology and the parallel technology are now old technology because of hardware like USB and Firewire. They are ports on the back of your computer. Serial ports transfers bits one at a time in a single file one bit at a time. Parallel ports transfers data 8 bits are a time across 8 wires. There are still serial ports on your computer, a serial port comes in 9 and 15 pins and is a male. Things that used to and sometimes still do connect to them are mice, external modems, PDAs and cameras. Parallel ports have 25 pins and is female. Most the time printers used to connect to parallel ports.
The serial technology and the parallel technology are now old technology because of hardware like USB and Firewire. They are ports on the back of your computer. Serial ports transfers bits one at a time in a single file one bit at a time. Parallel ports transfers data 8 bits are a time across 8 wires. There are still serial ports on your computer, a serial port comes in 9 and 15 pins and is a male. Things that used to and sometimes still do connect to them are mice, external modems, PDAs and cameras. Parallel ports have 25 pins and is female. Most the time printers used to connect to parallel ports.
Is it true or false that Most computers today come with Ethernet adapters already installed?
Yes, they do. Some people use older computers that need it installed though.
In which layer of osi model dose repeater works?
It depends on what kind of model it is, but in the model for computer 321O, it is on the layer between trhe keyboard and the behind screen, and there is a button with the osi code and there says everything.
A VPN looks like a private network when standing at a user node, say a voice PBX, but is actually connected to the public switched telephone network or even a shared Centrex platform.
Generally the public telephone network interfaces for say 24 or 30 channels can be formatted to use the Private Network Signalling System protocol (DPNSS or QSig). Calls are then switched over some distance to the far end where they leave the public network to the user location on a similar link.
The modern digital telephone exchange allows this a lot easier than a mechanical exchange ever could and the private network then achieves the resilience and high availability of the public network platform on which it resides.
What single connection do NIC's usually have?
The single connection all NIC cards usually have is an RJ45 jack. This allows for Ethernet cables to be readily connected.
How do you install a network printer?
FIRST WAY: This is the cheapest and the easiest way to connect a printer to multiple computers. Simply plug the printer in one of the computers and set it up as shared printer over the network. It requires that the computer, to which the printer is connected be switched on, for the other computer to access the printer (Follow this link for more)
http://www.techyv.com/questions/windows-networking-problem-set-printer
Difference between twisted pair cable and coaxial cable?
Coaxcial cable is typically a copper core cable with a shield separated by an air gap. It carries electrical signals along the center conductor relative to ground (usually the outer shield is tied to ground.
Fibre optic cable is glass strands which carrry light in the form of pulses rather than electrical currents.
Fibre carries a digital signal whilst copper (coaxial) commonly carries an analogue signal.
A server room is an area set aside specifically to house the business' servers where all the information is accessed. It requires insulation and air conditioning so that the servers are not damaged by the environment.
How can a router IP address be changed?
You need to enter the set up screen for the router and look at the settings. If it is set up as a DHCP server it will have a base address preset, usually 192.168.0.1 and will assign ip addresses to any equipment that is connected to it. You can change the base ip address, say to 10.0.0.1 to suit the needs of other equipment, or you can turn off the DHCP server and allow the router to be given an ip address by another DHCP server on your network, or you can assign a fixed ip address to the router. Read the manual that came with the router and check the makers web site for more information.
Every URL consists of some of the following: the scheme name (commonly called protocol), followed by a colon, two slashes, then, depending on scheme, a domain name (alternatively, IP address), a port number, the path of the resource to be fetched or the program to be run, then, for programs such as Common Gateway Interface (CGI) scripts, a query string,and an optional fragment identifier.
How do you configure a Cisco 2950 switch?
Follow these steps to start the Express Setup program.
1. Verify that no devices are connected to the switch.
2. Press and hold the Mode button, as shown in Figure 1, until the four LEDs next to the Mode button turn green.
This takes approximately 2 seconds.
Note: This only works on switches that do not have a configuration file in their file system.
3. When the four LEDs turn green, release the Mode button.
Note: If all of the Mode LEDs begin to blink after you have held the Mode button for 2 seconds or you cannot get the four LEDs to remain lit, a configuration already exists on the switch. In this case the switch cannot enter Express Setup mode. See the section of this document Clearing the Switch IP Address and Configuration for the instructions on deleting a configuration file from a switch.
4. Connect the Ethernet cable (not included) to a 10/100 Ethernet port on the front panel of the switch,
Caution: Do not connect the switch to any device other than the PC being used to configure it.
1 - Switch
2 - Ethernet cable
3 - PC or workstation
5. Connect the other end of the cable to the Ethernet port on the PC and verify that the port status LEDs on both connected Ethernet ports are green.
6.Wait approximately 30 seconds after the port LEDs turn green, and launch a web browser on your PC.
7.If you are using DHCP on your PC, you need to obtain the 10.0.0.2 IP address from the switch now.
Do one of the two following options depending on the operating system on your PC.
If you have manually configured your PC to use 10.0.0.2, skip this step and proceed to step 8.
Windows 95/98/ME:
A. Select Start > Run and enter winipcfg.
The WINIPCFG application opens as shown in Figure 3.
Note: You must select the NIC that you have connected to the switch in the WINIPCFG window before continuing this task.
If the IP address is already 10.0.0.2, proceed to step 8.
B.Click Release All.
C.Click Renew All.
When the IP address has changed to 10.0.0.2, proceed to step 8.
Windows 2000/XP
a. Select Start > Run and enter CMD to open a command prompt window.
b. Enter the command ipconfig /release at the prompt.
c. Enter the command ipconfig /renew at the prompt.
d. Enter the command ipconfig /all at the prompt to display the current settings.
When the IP address has changed to 10.0.0.2, proceed to step 8.
Enter the IP address 10.0.0.1, as shown in Figure 4 in the browser, and press Enter.
8. Enter the IP address 10.0.0.1, as shown in Figure 4 in the browser, and press Enter.
Consider the following issues if the Express Setup home page does not appear in your browser.
- Are you running Cisco IOS Software Release 12.1(14)EA1 or later on the switch?
- If not, upgrade it now.
- Did you release and renew the IP address on your PC using DHCP or manually configure its address to 10.0.02?
- If not do so now. See Appendix A: Setting up the IP address on your PC to use Express Setup for help.
- Did you wait 30 seconds after connecting the switch and PC or workstation before entering the IP address in your browser?
- If not, wait 30 seconds and re-enter 10.0.0.1 in the browser, and press Enter.
- Did you enter the wrong address in your web browser, or is there an error message displayed in the browser window?
- Re-enter 10.0.0.1 in the browser, and press Enter.
- Did you connect a crossover instead of a straight-through Ethernet cable between an Ethernet port of the switch and the Ethernet port of the PC, as shown Figure 3?
- If not, reconnect the cable to the Ethernet port on the switch and PC. Wait 30 seconds before entering 10.0.0.1 in the browser.
- Did you verify that POST successfully ran before starting Express Setup?
- If not, make sure that only the SYST and STAT LEDs are green before pressing the Mode button to begin Express Setup.
- Did all of the Mode LEDs begin to blink after you have held the Mode button for 2 seconds?
- If they did, a configuration already exists on the switch and the switch cannot go into Express Setup mode. Release the button. For more information, see the section titled Clearing the Switch IP Address and Configuration.
Difference between pure aloha slotted aloha in networking?
1) Pure Aloha is a Continuous time system whereas Slotted Aloha is discrete time system.
2) Pure ALOHA doesn't check whether the channel is busy before transmission.
Slotted ALOHA send the data at the beginning of timeslot.
3) Pure aloha not divided in to time .Slotted aloha divided in to time
What are the advantages and disadvantages of using school network?
The disadvantages of having a school network are that if everyone uses the computers at once it may cause the network system to run slow and it is a high risk that your computer will get hacked or have a virus. If something goes wrong with the file server then the whole system will not be able to operate. Hope this answers the question :) Nabiha xx
What are three concerns dealing with Internet security and privacy?
Malware, phishing, and botnets. Answer: Information security solutions have focused on preventing external threats such as viruses, hackers and worms through perimeter solutions that include firewalls and antivirus software. While still aware of outside threats, companies are now coming to understand they can no longer ignore inside violations concerning data at rest. So information security and privacy is of atmost importance whether it is internal or external.
Today's employees are able to easily export sensitive files and information via email or by copying to file shares and portable media without concerning about data security and data privacy. Many companies simply do not have the resources or appropriate policies in place to identify NPI and PII and avoid inadvertent, accidental mis-steps or malicious actions from within. As companies continue to accumulate NPI and PII, they are under enormous pressure to mitigate risk and to provide data security to sensitive information before an undesirable loss occurs. Whether you call it data security, Content Loss Prevention or simply Information Security solutions & Privacy, the time has come to take steps to protect your company's data privacy.
