service port number
The data link layer header contains the destination and source of information of the original frame and device sending information. You will also find that it contains the information of the device to receive it.
destination host logical address
The data link layer header contains the source's physical address. It refers the address that is found in the Network Interface Card.
The information that is changed in the header by the router is the layer 2 source along with the destination address. The layer 3 source and destination address are not changed.
According to the Networking book by Jeffery S. Beasley..... it is the "Network" layer (layer 3) that adds a header including routing information. This can be verified on page 123.
The destination host address
Transport layer is responsible for reliable delivery of information, error correction and so on.
Packet delivery is done by 3rd layer as well as 4th layer . But there is a difference between both of them . The network layer ensures source to destination delivery but the the transport layer ensures end to end delivery.
An atmospheric layer that contains layer is stratosphere. It contains ozone layer.
the Layer 2 source and destination address
network layer delivery logically communicate between the source-to-destination. while Transport layer delivery logically communicate between PROCESS-to-PROCESS.
Trailer is added at only data link layer because data link layer provides error and flow control.Header Contains address of device where frames will be send
The layer that contains ozone is atmosphere. The atmosphere contains a sub layer called stratosphere which contains the former.
Stratosphere is the layer of atmosphere which contains the ozone layer.
UDP is a Transport layer protocol or fourth layer protocol. UDP is a connection less protocol used in transport layer. UDP header have four fields in total .
The layer of atmosphere that contains the ozone is stratosphere. The stratosphere also contains the ozone layer.
destination host address
the data in the network layer is called packet.this network layer is used to transmit the data from source to destination.here in this layer,the main responsibility is routing.trailor is used in the data link layer ,as well as network layer for the error correction.the header has to be added to trasmit the data from one layer to the next layer.
The stratospheric layer contains it. It is the layer which contains maximum of it's concentration.
The layer is stratosphere. It contains the ozone layer.
Stratospheric layer contains clouds. It also contains ozone.
Ionosphere is the layer of atmosphere which contains ions.