Which of the following statements are true? A) The physical layer defines the me

Question

Which of the following statements are true?

A) The physical layer defines the means of transmitting raw bits rather than logical data packets over a physical link connecting network nodes. The bit stream is converted to a physical signal that is transmitted over a hardware transmission medium such as Ethernet or WiFi or Bluetooth. The physical layer provides an electrical and mechanical interface to the transmission medium.

B) The data link layer transfers data between nodes on the same network. The data link layer is concerned with local delivery of frames that do not cross the boundaries of a local network. Inter-network routing and global addressing are higher-layer functions, allowing data-link protocols to focus on local delivery.

C) The network layer is responsible Internet Protocol (IP) packet formation and for packet forwarding including routing through intermediate routers based on knowledge of the network addresses of neighboring network nodes. IP is connectionless in that a datagram can travel from a sender to a recipient without the recipient having to send an acknowledgement. Connection-oriented protocols exist at other, higher layers of the OSI model.

D) The transport layer provides services such as connection-oriented data stream support, reliability, flow control, and multiplexing. The best-known transport protocol is Transmission Control Protocol (TCP) used for connection-oriented transmissions, whereas the connectionless User Datagram Protocol (UDP) is used for simpler messaging transmissions.

E) The application layer contains the communications protocols and interface methods used in process-to-process communications across a computer network. The application layer is implemented in each application as a way of interpreting or decoding payload data transmitted using other OSI layers. Hyper Text Transfer Protocol (HTTP), File Transfer Protocol (FTP), Simple Mail Transfer Protocol (SMTP), and Remote Procedure Call (RPC) are all examples of application layer protocols.

F) A protocol is a set of of rules that facilitate communication between two or more entities. Data exchanged has to be evaluated in the context of ongoing communication, and a protocol defines the data structures and processes used to perform the evaluation.

1. A, B, C, D, E, F

2. B, D, F

3. F

4. A, B, C, D, E

5. A, C, E

Explanation / Answer

Answer: 4). A ,B,C,D,E

Since the F is not correct because A protocol is a set of rules that facilitate communication between one or more entities but not two or more entities.

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