Suppose a computer sends a packet at the transport layer to another computer somewhere in the Internet. There is no process with the destination port address running at the destination computer. What will happen?
Answers
Answer:
Explanation:
List the layers of the Internet model.
Physical, Data Link, Network, Transport, Application.
Which layers in the Internet model are the network support layers?
Physical, Data Link, Network.
Which layer in the Internet model is the user support layer?
Application.
What is the difference between network layer delivery and transport layer delivery?
Transport layer is responsible for process (source) - to - process (destination) delivery of entire message, whereas network layer oversees host (source) - to - host (destination) delivery of individual packets across multiple links.
What is a peer-to-peer process?
The processes at each machine that communicate at a given layer. Physical Layer has a direct link between 2 devices, while other layers have to pass the information down to the lower layers on the sender device by adding extra bits at each layer, and the receiver device unwraps the message at each layer moving upwards till it finally reaches the corresponding communicating layer.
How does information get passed from one layer to the next in the Internet model?
At the physical layer, communication is direct between devices. At the higher layers, however, communication must move down through the layers on sending device, over to receiving device, and then back up through the layers. Each layer in the sending device adds its own information to the message it receives from the layer just above it and passes the whole package to the layer just below it. At layer I the entire package is converted to a form that can be transmitted to the receiving device. At the receiving machine, the message is unwrapped layer by layer, with each process receiving and removing the data meant for it.
What are headers and trailers, and how do they get added and removed?
Additional information wrapped with the data unit at each layer. Usually, a trailer is added at data link layer. Header and trailer contain information such as source/destination address, control bits, error correction bits etc. These extra bits are added at the layer at sender's side, and removed at the corresponding layer at receiver's side.
What are the concerns of the physical layer in the Internet model?
The physical layer is concerned with actual transfer of data bits across a transmission medium between 2 devices. The physical layer coordinates the functions required to carry a bit stream over a physical medium. It deals with the mechanical and electrical specifications of the interface and transmission medium. It also defines the procedures and functions that physical devices and interfaces have to perform for transmission to occur. Physical characteristics of interfaces and medium, Representation of bits, data rate, synchronization of bits, line configuration, physical topology, transmission mode.
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