For the TCP/IP protocol suite, What is the correct order of events when a Telnet message is being prepared to be sent over the network?
1) the IP header is added, the TCP header is added, the ethernet header is added, the telnet-formatted data is provided to the next layer
The Correct Answer and Explanation is:
The correct order of events when a Telnet message is being prepared to be sent over the network is:
1) Telnet-formatted data is prepared by the application layer.
2) TCP header is added by the transport layer.
3) IP header is added by the internet layer.
4) Ethernet header is added by the data link layer.
Explanation:
The process of sending a Telnet message involves several layers of the TCP/IP protocol suite, with each layer adding its respective header or performing a specific function. The order of events reflects the steps taken to prepare the data for transmission over a network:
- Telnet-formatted data (Application Layer): The message that is generated by the Telnet client is formatted according to the Telnet protocol. This is typically a stream of characters, where Telnet is used for terminal emulation. At this point, the message is ready at the Application layer, and no headers have been added yet.
- TCP header (Transport Layer): Once the Telnet-formatted data is ready, the next layer, the Transport layer (specifically TCP), takes over. The TCP protocol is responsible for breaking down the data into segments, ensuring reliable communication. The TCP header includes important information such as sequence numbers, acknowledgment numbers, port numbers (e.g., port 23 for Telnet), and flags for controlling the session.
- IP header (Internet Layer): After the data has been segmented and prepared with a TCP header, it moves to the Internet layer, where the IP header is added. The IP header contains the source and destination IP addresses, which are necessary for routing the packet across the network. This layer does not guarantee reliability but ensures that the data reaches the correct destination.
- Ethernet header (Data Link Layer): Finally, the data reaches the Data Link layer, which is responsible for handling the local transmission of data over a physical network. The Ethernet header is added here, containing the MAC addresses (Media Access Control addresses) of the sender and receiver devices. This header ensures that the data can be delivered over the local network segment to the correct device.
Once the Ethernet header is added, the data is ready to be transmitted over the physical network (e.g., via Ethernet or Wi-Fi). The process of encapsulation in each layer ensures that the data is properly formatted for each step of its journey from the sender to the receiver.