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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 are the disadvantages of star and bus topologies?

The disadvantage of using a bus topology is that a break in any of the connecting cables will bring down the entire network segment.

The disadvantage of using a star topology is limited to the central connecting device; it is breaks, the entire network goes down.

What is the space and time Complexity of Fibonacci series algorithm?

There's more than one algorithms, the best one is the following:

F(n) = 1/sqrt(5) * (q1^n + q2^n)

where q1=(1+sqrt(5))/2, q2=(1-sqrt(5))/2

What are the layers of computer system and types of layers?

following are the different layers of computer

1:APPLICATION PROGRAMS/USER
2:UTILITY
3:O.S
4.HARDWARE

A system uses the stop-and-wait arq protocolif each packet carries 1000 bits of data determine the time taken to send 1 million bits of data if the distnce between te sender and receiver is 5000 km?

The first answer is this:

"We require to send 1000 frames. We ignore the overhead due to the header and trailer.

Data frame Transmission time = 1000 bits / 1,000,000 bits ( 1 Mbps = 1,000,000 bps)

= 1 ms

The distance between the sender and receiver is 5000 km.

Data frame trip time = 5000 km / 200,000 km

= 25 ms

ACK transmission time = 0

ACK trip time = 5000 km / 200,000 km

= 25 ms

Delay for 1 frame = 1 + data frame trip time + ACK trip time

= 1 + 25 + 25

= 51 ms.

Total delay = 1000 51ms

= 1000bits 51 10-3

= 51s"

The second answer is this:

"The propagation delay is given by tp = d/c

Where d = distance between transmitter and receiver, c = speed of light, d = 5000 and c =3000000

So, tp = 5000/300,000 = 0.02

Transmission delay tt = L/λ

Where L = number of bits in the frame and λ = transmission rate in bits per sec.

Here L = 1000 and λ = 200000000

So, tt = 1000/200000000 = 0.000005

Total time taken T = tt + 2tp

T = 0.000005+0.02

T = 0.020005"

Which categories of UTP cabling can be used in Gigabit Ethernet networks?

According to the Certblaster 2009 Comptia A+ CD practice exam the answer is Cat 6 cabling

Cat5E can also be used and is in use more than the expensive and hard to work with CAT6.

Can a mac share printers with windows computers on WPA-Personal network?

Sharing printers between Macs and Windows PCs is quite doable and should not present any major problems. Apple support has information about possible problems. (See links below)

What are the advantges of owning a computer network?

You can always fix it if you set up your network and you can also

Who made TCP?

The history of TCP/IP is like the protocol -- interdependent design and development conducted by several people and brought together as one. Following the design of TCP/IP byRobert Kahn and Vinton Cerf as described in the previous pages, DARPA contracted with three sites to develop operational versions: * BBN. A TENEX/PDP-10 implementation led by Ray Tomlinson and Bill Plummer. * Stanford. A BCPL/PDP-11 implementation led by Richard Karp from Cerf's group. * The University College London. A PDP-9 implementation led by Peter Kirstein. Four increasingly better versions of TCP/IP were developed -- TCP v1, TCP v2, a split into TCP v3 and IP v3 in the spring of 1978, and then stability with TCP v4 and IPv4 -- the standard protocol still in use on the Internet today.

In a RIP routing table what hop count indicates that the network is unreachable?

rip hop count is 15, if it reaches 16 it indicates network is unreachable

Has anyone used Zephanol-HP?

I have used it before. I only wanted to lose 5 kilograms then and it helped me lose 6 kilograms. SO i was happy with the results. i have to mention that i loved the appetite suppression effect!

What do the slash and number following an IP address mean?

Thanks to a good professional I asked, it is a "CIDR". He referred me to a good Wiki article on the meaning: http:/en.wikipedia.org/wiki/Classless_Inter-Domain_Routing It tells all about it.

Du internet connection wireless router ip address?

well for mine it is 192.168.1.1. I also bought a Dlink Wireless access point which i plugged in to the third ethernet port. This had a access point of 192.168.0.50 however it has to be wired to you computer to access thre admin panel.

How do you run ping command with a school blocking system?

With a few tools, you can access ping and an assortment of other commands, blocking system or no. The easiest way: on a Windows PC not affected by the blocking system, go through C:\Windows and find the file called "command.com". Copy this file to a USB flash drive or similar. When on a school PC, you can run command.com to access a traditional command prompt. Use it to run ping. Easy. If the ye olde command.com prompt isn't newfangled enough for you, there's a multitude of third-party command prompts around. Try out Console2, linked below, to start with.

How many users have bittorrent?

It is estimated that there are 50 million regular users of bittorrent.

See related link for more.

How do you use a campus security portable safe of protocol?

Go to this website and you will have the instructions on setting the combination for the safe - no instructions came with the safe - saves money that way

Can router be traced to a preson through internet connection?

Because your router has a unique IP address (usually it's the case), your IP address can be traced back to the physical address (town, street, house, apartment), if you are registered as a resident at your current address people with certain skills will track you down for couple minutes.