0
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 commands allow you to view the routing table on your Linux workstation?
run the command:
route -n
You may need to be root (or use sudo) to run that command, or at least call its full path /sbin/route or /usr/sbin/route
route --help
will give you additional info, as will
man route
EAP
4 examples of intermediary network devices?
Azharuddin university of Malakand
Intermediary devices-
switches
Network switches or packet switches are devices that connect the various segments of a network, and their main function is switching packets of data. Also known as a network bridge, they switch processes and rout data at the level of the data link layer, which is second of the OSI model layers (concerned with physical addressing of data). A switch may also operate at the level of other OSI layers like the physical, network or transport layer. Multilayer switches act at different OSI layers simultaneously. Network switches play a vital role in the functioning of local area networks.
Routers
As its name suggests, a router is an intermediary device that regulates and routs data traffic between computer networks. It forwards data to various network destinations and controls flow of data between two or more logical subnets, which do not have the same network address in a large network. It selects the optimum path for data transfer between two points in a network. Routers are one of the most vital network devices that make data transmission possible.
Modem
A modem (modulator - demodulator) is an intermediary device that converts analog signals transferred over networks into digital signals and digital signals back to analog. They enable the transmission of digital data over analog mediums like telephone lines and optic fiber cables.
Wireless Access Points
A wireless access point (WAP) is an intermediary device in a network that connects various types of wireless communication devices to connect with wireless networks. The connectivity is made possible through 'Bluetooth' and 'Wi-Fi technologies'. It acts as an intermediary between wireless devices and wired devices that are part of a network.
Hub
Working at the physical layer of the OSI model, a hub is basically a connector between ethernet segments which also control the bandwidth sharing among connected computer terminals.
Repeater
Repeaters are network devices that carry out the task of maintaining signal strength over its transmission through a network. They regenerate data signals and amplify them for further transmission.
Firewall
A firewall is any hardware appliance or software designed to filter network traffic that passes through it according to certain criteria and trust levels set by the network administrator.
What is the theoretical maximum channel capacity of traditional telephone lines?
C = B * log2(1 + SNR)
C= channel capacity
B= Bandwidth , telephone lines have a usable range of around 3400Hz
= =
To best answer this question consider why we needed sequence numbers in the first place. We
saw that the sender needs sequence numbers so that the receiver can tell if a data packet is a
duplicate of an already received data packet. In the case of ACKs, the sender does not need this
info (i.e. a sequence number on an ACK) to tell detect a duplicate ACK. A duplicate ACK is
obvious to the rdt3.0 receiver, since when it has received the original ACK it transitioned to the
next state. The duplicate ACK is not the ACK that the sender needs and hence is ignored by the
rdt3.0 sender.
A gateway, or router, connects different networks.
A gateway, or router, connects different networks.
A gateway, or router, connects different networks.
A gateway, or router, connects different networks.
-Broadcast-based Peer-to-Peer (P2P) networks, including flat (e.g., Gnutella) and two-layer super-peer implementations (e.g., Kazaa), are extremely popular nowadays due to theirsimplicity, ease of deployment and versatility. The unstructurednetwork topology, however, contains many cyclic paths whichintroduce numerous duplicate messages in the system. Whilesuch messages can be identiï¬ed and ignored, they still consume alarge proportion of the bandwidth and other resources, causingbottlenecks in the entire network.In this paper we describe DCMP, a dynamic, fully decentralized protocol which reduces signiï¬cantly the duplicate messagesby eliminating unnecessary cycles. As queries are transmittedthrough the peers, DCMP identiï¬es the problematic paths andattempts to break the cycles, while maintaining the connectivityof the network. In order to preserve the fault resilience andload balancing properties of unstructured P2P systems, DCMPavoids creating a hierarchical organization. Instead, it appliescycle elimination symmetrically around some powerful peersto keep the average path length small. The overall structureis constructed fast with very low overhead. With the information collected during this process, distributed maintenanceis performed efï¬ciently even if peers quit the system withoutnotiï¬cation. The experimental results from our simulator andthe prototype implementation on PlanetLab, conï¬rm that DCMPimproves signiï¬cantly the scalability of unstructured P2P systemswithout sacriï¬cing their desirable properties. Moreover, due to itssimplicity, DCMP can be easily implemented in various existingP2P systems and is orthogonal to the search algorithms.
What are the three basic forms of network media on which data is represented?
they are copper wire, fiber, wireless
got this from Cisco academy ccna textbook.
modem means modulator demodulator. it converts digital signal to analog signal. it is use to transmit computer signal (digital signal) over the telephone line to communicate to other computers. modem converts the computer digital signal into frequency (analog signal) so that it can transmit over the telephone line and at the receiving end the modem converts the analog signal back to digital for the receiving computer to understand it.
Why is a WAN useful for schools computer lab?
A WAN is any technology used to connect networks at a greater distance. Without a WAN, your home - or in this case, your school - won't have a connection to the Internet.
How do you change a MAC address of a PC?
This cannot be done, the MAC address is set in the hardware at the factory to a unique value that no other network device has anywhere in the world and cannot be changed.
Where can one find information on IP stock?
IP stock information can be found at a variety of places on the web. For information on IP stock, one could look at MSN Money Investing , Market Watch, Yahoo Finance, and The Street.
Where can one purchase a refurbished router?
One can purchase a refurbished router at any electronics or online retailer which supports return on their products. Many of these retailers will have refurbished deals on products such as routers since they cannot repackage them as new.
What are the Six Flags of a TCP packet?
Six Flags
1-Urgent Pointer
2-ACKnowledgement
3-PUSH
4-Reset (RST) Flag
5-SYNchronisation Flag
6-FIN Flag
A LAN is a local area network, meaning it is confined to one place.
LAN (Local Area Network) is a computer network covering a small geographic area, like a home, office, school, or group of buildings.
it's high speed (1000 mbps)
A WAN is a wide area network that spans large areas or distances, such as the Internet that goes everywhere.
WAN (Wide Area Network) is a computer network that covers a broad area (e.g., any network whose communications links cross metropolitan, regional, or national boundaries over a long distance).
It's Less speed 150 mbps
Lan is better for connecting in local area business where as Wan is better to connect is world wide business.
In my view WANOS is a best networking service provider & also with an affordable price.
How can I soundproof a server rack?
Being an active part of the digital age, we are well aware of how annoying can the buzzing noise from an equipment be. It is even more problematic when we are required to be productive, but the constant sound becomes a hindrance. This noise from active IT equipment in a high-technology workspace can lead to health issues like loss of productivity, work slowdown due to depression, and hearing impairment. Prolonged exposure can lead to serious health issues too.
Soundproof rack is an ideal option to minimize this sound. Switching to an acoustic rack can reduce the noise drastically to a level of 30 dBA. The audibility in an office space can vary anywhere between 48dBA to 78 dBA. So, if a device reduces the noise limit up to 30 dBA, it would mean the sound equivalent to that of a whisper’s level. Designed specifically to get rid of the equipment noise, an acoustic rack is considered the best soundproof server cabinet as they are lined with a fire retardant, multilayer acoustic material within the inner surfaces to achieve a superior level of noise reduction from high frequency noise. Hence, the Acoustic Rack Active from Netrack is a desirable solution for such noise issues.
Soundproof rack cabinets are also equipped with Active noise-cancelling technology which is highly effective in reducing low-frequency noise. The ASFT (Active Silence Fan tray) in acoustic racks reduces the noise produced by auxiliary fans and installed equipment noise to the surrounding noise level
Name the error which occurs when you write on a page?
The main error which occurs when writing on the page is the text disappearing. This, however, is very common when using digital pens on tablets. To ensure proper functionality, make sure the pen and the tablet have been charged.
What was the method of sharing files between computers before networks were invented?
Floppy disks. Now referred to as "sneaker-net", because you walk the disk from one machine to another wearing your shoes (sneakers).
What is your subnet address if your ip is89.125.27.81?
The subnet address for this ISP could be almost anything, depending on how the ISP breaks up a larger network pool into a smaller one. The default subnet would be 255.0.0.0, but that is not very likely with an ISP. You can check by using the 'ipconfig' command in Windows to see the subnet mask, or 'ifconfig' if using Linux.
Why does running make a person breathe faster?
Your body uses oxygen make energy, and muscles need energy to relax and contract, or flex. As you run, the demand for energy in your muscles increases, and so your lungs work harder to provide the oxygen your muscles are begging for. The result of higher demand for oxygen is faster deeper breaths.
Why is TFTP a less secure protocol than FTP?
because tftp does not require a logon id and password to connect to the server and ftp does answer from the book network+ guide to networks by Tamara Dean fourth edition on page 191 chapter4
