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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
A data transmission which involves only one transmitter and one receiver is known as?
Point-to-point transmission
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What are the function of networking protocol?
To facilitate transfer of information over a network in an orderly manner, so that every sender gets a chance to send and every receiver can recognize what it is to receive. Error checking and retry mechanisms are also included to prevent corruption or loss of data in the transfer.
is it 4 inverse of mod 17 or whole inverse? Whole inverse do not make sence, so, ans for the q is 13.
Difference between computer network and distributed operating system?
On a computer network, operating systems communicate with each other. In a distributed operating system, a single OS is communicating with itself across multiple machines.
Relation between channel capacity and bandwidth?
According to Shannon's Channel Capacity Equation:
R = W*log2(1 + C/N) = W*log2(1+ SNR)
Where,
R = Maximum Data rate (symbol rate)
W = Bw = Nyquist Bandwidth = samples/sec = 1/Ts
C = Carrier Power
N = Total Noise Power
SNR = Signal to Noise Ratio
How the data transmission occurs through crossover cable connection?
A crossover cable connects two computers without going through a switch. The data transmission happens just like in a switched environment. You still have to have a network client with viable addresses, and they have to be the same format, such as same subnet mask and default gateway.
Sanyo pro xtra x multiverse projector shows red as black?
It is likely that the projector is using a red, green and blue video signal cable. One example is a VGA connector but there are others that use the same signal format. If that is the case, it is the red signal that is not being displayed and that is almost certainly a fault in the cable.
If the problem persists even if the input signal is a composite or S-video, then it may be a fault in the projector itself. Check the set up menus on the projector to make sure that the inputs are set up correctly. If that doesn't solve the problem, it sounds like it might be time to seek the help of a repair center for a diagnosis and a quotation for a repair.
What layer of OSI model does HTML operate?
HTML is read by a browser and a browser works at the Application Layer.
wikipedia, google, yahoo, facebook, twitter etc...
How do you find default router?
go to start> run> type in (cmd) then click ok, then type (ipconfig/all) you will find it! if you want to know the number code then its> 192.168.1.1
What are the qualifications for a help-desk technician?
It depends on the company. Some companies require a decent amount of knowledge to be on the help desk. Others, namely my ISP, requires a heartbeat.
What if you looked under internet options but do not see connections?
There are many software tools which can be use to hide connection tab in network option. Balbir singh
What are different security mechanism in network security?
The process to implement the security properties is known as security mechanism. The various type of mechanism on the basis of properties is as follows:
- Attack Prevention
- Attack Avoidance
- Attack Detection
Attack Prevention: can be defined as a series of security mechanism implemented to prevent or defend against various types of attack before they can actually reach and affect the target systems. An important mechanism is access control which is defined as the process of limiting the access to the resources of the Information System. Access can be implemented at different levels such as the operating system the network and the application layer.
A firewall is also an important access control system that is implemented at the network layer the concept behind firewall is to separate the trusted network from the entrusted network known as internet. The firewall prevents the attack from the outside world against the machines inside the internal network by preventing connection s attempts from the unauthorized entities located outside.
Attack Avoidance: The expansion of connectivity of computers makes the need of protecting the message and message from tampering reading important. This is the technique in which the information is modified in a way that makes is unusable for the attacker. This is performed under the assumption that the attacker may have access to the subject system/information. The sender preprocess the information before it is send through the unsecured system and the same is again post processed on the receiver end systems. This encryption and decryption is perfumed by cryptography mechanism, they are further divided in the following forms:
- Secret Key Cryptography
- Public Key Cryptography
- Hash Functions
Attack Detection: In this mechanism it is assumed that the attacker is able to bypass the installed security measures to access the desired target/information. When such incidents happens attack detection takes the responsibility to report someone that something went wrong somewhere in the system.
Attack detection is not an applicable mechanism instead of that it's a check/measure which will make sure that if anything happened badly in the system then someone should be notified for the same.
What is the use of reverse ARP?
Reverse ARP is used to Obtain IP address from a Server(responsible for IP addresses allocation) by providing its layer 2 (MAC) address.
Who first saw the star of Bethlehem?
The three wise men who were living in the Orient at that time. They saw it months before the birth of the Lord. Then they decided to follow the star and they had to travel several months to arrive in Bethlehem. The shepperds did not see the star until the night the Lord was born so they saw it much later!
Which operating system is easiest to learn?
While everyone will have their own personal preferences, it's hard to imagine any operating system being easier or more intuitive than Apple's OSX series. Right now the latest is Leopard, which is OS 10.5.
What is the difference between distributed operating system and network operating systems?
The network managers are responsible for all the customers, including other networks that they buy and sell electricity to and from. Typically the distributed operating system mostly worries about the local electricity needs, however incompetent behavior is often penalized such as shut down without warning of the distributed system, non-sinusoidal waveform, poor power factor, poor phase matching, over loading interconnecting power lines and high or low voltage operation = the voltage needs to be matched plus or minus about one volt. Neil
Or alternatively, if you meant the two kinds of computer operating systems:
A network OS will share filesystems over several machines, and each computer system schedules their own processes individually. (Windows, OS X)
A distributed OS will also share the scheduling of processes as a collective group for the networked machines. A program running on one system may have subprocesses running on other systems in the network, all cooperating and running as if on the same computer. (maybe GNU Hurd)
What is meant by the term low-order bits and high-order bits most significant bit?
The bits in a numeric value like
00000000 00110011
have a decimal value based on the bit position. The most significant bit is the one that has highest decimal value and is the left most bit. The right most bit is the least significant bit.
High-order bits are the half of the number of bits that have the highest values, the left most bits in the 16 bit value above The low order bits in this case are the right most bits.
This should not be confused with bit placement in memory/cpu registers. Intel/AMD cpus are little edian, meaning that the most significant part is physically right and the lest significant is left most (the bits are not in reverse order). Google for a more detailed info.
Describe the relationships among people information technology and information?
information(all kinds!) is of vital importance to people, companies and the like. information technology is the technology that is used to transmit this information from one person/company to another.
What is a wireless accesspoint receiver?
Believe it or not I have seen the need for this before on several occasions. The best way to do this is to use another wireless gateway and set up the two gateways (both must have the capability) as a point-to-point connection. Then you can set up wired ethernet connections on both sides to your heart's content. I would recommmend looking at Avaya hardware to perform this task.
What part of a computer coordinates all communication between other computers?
The networking card coordinates the communication between computers. This system responds to requests in order to establish a network. Routers are computers with the dedicated purpose of coordinating communication between the computers on a network and between computers on the local network and larger networks - including the Internet. They are a key element within networks.
