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The data link layer places the Cyclic Redundancy Check (CRC) in the trailer rather than the header to ensure that the entire frame, including both the header and the payload, is checked for integrity. By positioning the CRC at the end, the receiver can easily calculate the CRC after receiving the entire frame, allowing for effective error detection. Additionally, this placement helps maintain a consistent frame structure, where the header is reserved for addressing and control information, while the trailer can be dedicated to error-checking.
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What is the process of taking data from the layer above adding a header with addressing information in it called?
The process of taking data from the layer above and adding a header with addressing information is called "encapsulation." In networking, this occurs as data is passed down through the OSI model layers, where each layer adds its own header (or trailer) to the data unit, creating a new protocol data unit (PDU) for that layer. This encapsulation ensures that the data is properly routed and processed by the appropriate protocols at each layer.
Which OSI layer uses the header information to reassemble the data segments into streams?
transport layer
ATM use virtual circuit packet switching?
ATM use cell switching. it use a 52 by long packet where 48 byte is data and 4 byte is header.
In which of the following would be found in a data link layer header?
The data link layer header contains the source's physical address. It refers the address that is found in the Network Interface Card.
When data are transmitted from device A to device B the header from A's layer 4 is read by B's --- layer?
Transport Layer
Which three basic parts are common to all frame types supported by the data link layer?
header trailer Data
How does the data link layer prepare packets for transmission?
It encapsulates with a header and a trailer to create a frame.
During the encapsulation process of the TCPIP model which layer will attach the IP header to the data?
internet
What is the maximum size of data that the application layer can pass on to the TCP layer below?
2^16 bytes - size of TCP header
What is found on a datalink layer header?
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.
What is the purpose of 4 byte acknowlegement in tcp header?
The 4-byte acknowledgment field in a TCP header serves to confirm the receipt of data packets. It contains the next expected sequence number, indicating that all previous bytes have been successfully received. This mechanism ensures reliable data transmission by allowing the sender to know which data has been acknowledged and which may need to be retransmitted. It also helps in maintaining the correct order of data segments.
The layer 4 header contains which type of information to aid in the delivery of data?
service port number
