Reliable Data Transfer — Test 1

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.

Correct Answer: B. B. Connection-oriented protocol
Explanation: The major difference between TCP and UDP is connection, UDP is connection less protocol whereas TCP is connection oriented. UDP facilitates the application’s process to send the datagrams without building a connection between the two processes.

Correct Answer: B. B. False
Explanation: Transport layer deals with processes that are running on different hosts, hence reliability is achieved between processes. A single host can have multiple processes running in it with different port numbers. Reliability between hosts can be achieved by data link layer.