0 — Test 319

Correct Answer: A. A. Ppp can terminate the link at any time
Explanation: PPP allows termination of the link at any time in any phase because it works on the data link layer which is the layer in control of the link of the communication.

Correct Answer: D. D. Link dead phase
Explanation: The link necessarily begins and ends with the link dead phase. During this phase, the LCP automata will be in the initial or its final state. The link is non-functioning or inactive during the link dead phase.

Correct Answer: A. A. Transport layer
Explanation: Transport layer uses some protocols, such as UDP, TCP and SCTP to accomplish reliability. UDP works well for real time data and has multiple ways for packet transmission. SCTP and TCP also provide reliable services by establishing connections and make use of their special features like error control and flow control.

Correct Answer: D. D. Transport control protocol
Explanation: TCP can work well because it is robust and helps the packets to be delivered safely and quickly and it does not cause congestion. TCP was defined in RFC 793 and it has improved in a way that it can adapt the attributes of internet and deals with errors well.

Correct Answer: D. D. Tcp and sctp
Explanation: TCP and SCTP are connection oriented protocols and they ensure that there is no packet loss. Also, these protocols use different methods and mechanisms such as flow control, error control, congestion control and acknowledgments to achieve reliability.

Correct Answer: A. A. Flow control
Explanation: Senders may send the data at a rate that can not be handled by a receiver and may drench the receiver with load. In such scenarios, flow control mechanism informs the receiver to decrease the rate at which it is sending. If the rate is very slow, then the sender will be asked to increase the rate.

Correct Answer: B. B. Tcp
Explanation: TCP supports uni-casting transmission, where only one receiver and one sender will be present and it requires source and destination IP addresses only. Multi-casting is another version of transmission in which more than one receiver can be present.

Correct Answer: C. C. Sctp
Explanation: Stream control transmission protocol provides the facility to transmit multiple streams for a single connection. That is, a single connection can have multiple ways and block of one way(path) does not affect other streams.

Correct Answer: B. B. Connection establishment €? data transfer €? connection termination
Explanation: Primarily, the sender sends the request to a receiver in order to establish a connection; if the receiver accepts the request, then the data transfer takes place. After the transmission, connection is terminated.

Correct Answer: A. A. Multi-casting
Explanation: Multi-casting has more than one receiver host for a stream of data that is sent by a process and it maintains a group. But TCP supports uni-casting, in which one sender will have only one receiver. Broadcasting is also not supported by TCP.