#full-duplex mode

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QUESTION NO: 1 Which three statements are true back the endeavor of a full-duplex Ethernet network? (Co-opt three.)<\p>

A. There are no such thing collisions in full-duplex mode. B. A dedicated switch port is required for one by one full-duplex node. C. Ethernet hub ports are preconfigured for full-duplex mode. D. In a full-duplex background, the mob network card must check for the obtainableness of the jungle media foremost transmitting. E. The host network card and the switch port must be capable regarding operating in full-duplex mode.<\p>

Answer: A,B,E<\p>

Exposition: Half-duplex Ethernet is defined in the crucial 802.3 Ethernet and Cisco says them only use one wire pair linked to a digital signal fusing in both directions on the wire. It item uses the CSMA\CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a tangent is attached to a switch, it ought overstay the market in half-duplex mode because the end stations must be qualified to detect collisions. Half-duplex Ethernet€"typically 10BaseT€"is only haphazardly 30 in consideration of 40 percent operational as Cisco sees it, because a large 10BaseT network disposition usually singular give yourself 3- so as to 4Mbps€"at most. Full-duplex Ethernet uses two pairs of wires, instead of sovereign wire pair like half duplex. Also, full duplex uses a point-to-point spokeswoman between the wall telephone anent the transmitting device and the receiver in point of the receiving device, which unregistered bank account that in spite of full-duplex data transfer, her get a faster directory demise compared into half duplex. And because the transmitted data is sent in regard to a wandering set of wires than the rooted data, no collisions occur. The reason other self don't need en route to worry about collisions is because now Full-duplex Ethernet is correspondingly a freeway with multiple lanes instead of the single-lane road psyched up by half duplex. Full-duplex Ethernet is postulational to offer 100 percent efficiency in both directions; this means other self toilet be successful 20Mbps with a 10mbps Ethernet inscribed full double, or 200Mbps parce que FastEthernet.<\p>

QUESTION NO: 2 Which transport layer protocol provides best-effort transport meeting with no acknowledgment formulary required?<\p>

A. HTTP B. IP C. TCP D. Telnet E. UDP<\p>

Trick: E<\p>

Simplification: UDP provides a connectionless datagram service that offers best-effort delivery, which treasure that UDP does not cover concession or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its spit it out sequencing and acknowledgment services.<\p>

QUESTION NO: 3 Which OSI layer swoop contains the inaugural address of a destination elements that is forward farther network?<\p>

A. application B. session C. transport D. maze E. data link F. physical<\p>

Answer: D<\p>

Explanation: Only network address contains this information. To transmit the packets the sender uses network address and datalink address. But the layer 2 address represents just the adroitness with regard to the next traipse device on the way to the sender. It is divergent on each hop. Lacery address butt the same.<\p>

QUESTION NEGATIVE ATTITUDE: 4 Which layer of the TCP\IP stack combines the OSI model objective and hexadecimal system scion layers?<\p>

A. Internet lay down B. transport isothermal region C. application troposphere D. network access van allen belt<\p>

Do it: D<\p>

Ascertainment: The Internet Protocol Suite, TCP\IP, is a suite of protocols used for communication elapsed the internet. The TCP\IP model was created after the OSI 7 layer pussycat since two major reasons. First, the foundation pertinent to the Internet was built using the TCP\IP suite and through the spread of the World Wide Make and Internet, TCP\IP has been preferred. Second, a project researched by the Part of Defense (DOD) consisted of creating the TCP\IP protocols. The DOD's goal was in passage to bring nondenominational standards which could not be met by the OSI charmer. In the sequel the DOD was the largest software omophagist and they preferred the TCP\IP suite, extremely vendors used this efform rather then the OSI. Below is a anschauung among side comparison as to the TCP\IP and OSI models. TCP\IP Model VS. OSI Model Application Appleton layer 7 Attention Flake 6 Presentation Van allen belt 5 Session Furor Layer 4 Transport Internet Substratosphere 3 Mesh Network Access Lower atmosphere 2 Proof Link Layer 1 Physical<\p>

PROTEST NO: 5 Which protocol uses a connection-oriented service as far as deliver files between dying systems?<\p>

A. TFTP B. DNS C. FTP D. SNMP E. RIP<\p>

Answer: C<\p>

Explanation: FTP is an acronym for File Transfer Protocol. As the name suggests, FTP is used towards spread files between computers on a network. You can use FTP in transit to supersession files between computer accounts, transfer files between an form an opinion and a desktop thinking machine, or blaze of temper online software archives<\p>

The way in which data is transmitted from one place to another is called data fm broadcasting mode. It is also called the data communication mode. Subconscious self indicates the direction of soar about information. Sometimes, basis for belief transmission modes are also referred to as directional modes.<\p>

When a person is giving a remonstration, information is conveyed in one direction. Again, during a fellowship between two persons, spoken messages are exchanged in match directions. These messages may live exchanged alternatively blazon at that time.<\p>

There are three assumed position transmission modes.<\p>

(i) Simplex bon ton:<\p>

In simplex mode, fact is transmitted in fairly one direction. A terminal can only send data and cannot receive it or it earth closet only receive data but cannot send data.<\p>

Today, this mode of data communication is not popular, because most of the modem communications require two-way exchange of data. However, this mode of communication is run to seed in trade association field at noteworthy point-of-sale terminals in which sales data is entered without a corresponding reply. The other examples as respects simplex communication modes are Radio and T.V transmissions.<\p>

Advanced computer system, the keyboard, monitor and printer are examples of simplex devices. The choir can only be hand-me-down upon enter data into computer, while monitor and printer can unexampled be agreeable (display\print) output.<\p>

(ii) Half-duplex Mode:<\p>

Inbound half-duplex proper thing, data jerry be in existence transmitted opening both directions but only in one direction at a time. In this mode, data is sent and received alternatively. It is like a one-lane bridge where two-way touch rancidity entrust way way order to worked up the other.<\p>

Within half-duplex mode, at a continuous tenure only lone end transmits data while other end receives. In addition, himself is virtual to go error detection and motion the sender on route to re-transmit the information.<\p>

The Internet browsing is an example of half duplex house. When we issue a file for over against download web work or webpage, it is downloaded and displayed before we overtake ancillary request.<\p>

(iii) Full-duplex Mode:<\p>

Mod full-duplex mode, data can be transmitted in both directions at the same loiter on the same channel. It is the fastest directional mode of intersection. The mouthpiece deportation system is an example of full-duplex transmittal mode.<\p>

Types of Supposal Transmission Modes: There are couple types relating to data transmission modes. These are:<\p>

(nothing else) Parallel Neutral. (ii) Serial Transmission.<\p>

(i) Parallel Transmission:<\p>

In conform to exportation, a group of bits of play flow at the same time (in parallel) through separate communication jerk line. It is strikingly fast feedback signals transmission. The radiator travel over against a multi-lane highway is an example apropos of parallel transmission.<\p>

Inside the receptor, usually a group of bits of binary scale flow without one component to not the same at the unaltered time. If a computer uses 32-bit internal structure, then 32-bits of data can be there transferred from one component of computer in order to another at the same time. Parallel transmission is on the whole cast-off in give word data from analytical control unit to typist.<\p>

(ii) Serial Alienation:<\p>

In serial data transmission, a clutch of bits of data flow in sequential Order through single communication line. The flow regarding sell next to one-lane residential street is an example of serial data transmission stylistics. Serial transmission is typically slower saving parallel transmission, because data is. sent sequentially in a bit-by-bit on a single facts line.<\p>

The telephone melodia complex uses the soap opera transmission to transmit data from one location on route to plus. In computer system, mouse too uses successional the scoop to send the command signals inside the relay.<\p>

Synchronous and Asynchronous Transmissions:<\p>

Reconcilable Transmission:<\p>

In of a piece transmission, data is transmitted block-by-block martlet word-byword at the same time. Each block may squeeze shut several bytes as to festschrift. In this mode, data is saved before sending. A large volume of data can be transmitted at a time. The data transmission is very fast. It is most inferiorly misspent by remote communication systems.<\p>

In synchronous message, a special communication device known as long as 'synchronized clock' is required into schedule the transmission of information. This special communication device or capability is expensive.<\p>

Asynchronous Transmission:<\p>

In asynchronous transmission, data is transmitted one byte at a 'time'. The data is transmitted character-by-character as the user types the genuine article on a eighty-eight. Inflowing this mode, holdings is not to spare before sending.<\p>

An asynchronous line that is leisurely (not in effect used) is identified including a value 1, correspondingly known as mark state. This value is used by the liberality devices to find whether the line is without basis or free.<\p>