Term
TCP/IP Basics
Which fields are included in the TCP header?
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Definition
Source port
Destination port
Window
Sequence number
Acknowledgement number
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Term
TCP/IP Basics
What is PAR? |
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Definition
Positive Acknowledgement and Retransmission
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Once the synchronization has occured, the transmission of data commences.
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Every segment will be sent with a sequence number and the destination will respond with an ACK which includes the sequence number of the segment received and verifies all previously sent segments.
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If a segment is not responded with an ACK, the same segment is continually retransmitted with a delay between each segment until the ACK is received
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Term
TCP/IP Basics
What has to happen first before any TCP features can begin thier work? |
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Definition
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Term
TCP/IP Basics
When TCP is establsihing a connection between 2 devices, what is the connection exist between? |
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Definition
| 2 sockets ,one at each end |
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Term
TCP/IP Basics
What is forward acknowledgement? |
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Definition
| Acknowledgement field in the TCP header implies the next byte to be received |
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Term
TCP/IP Basics
If a segment is lost or is in error during transmission, how does the receiving side retrieve the lost segment?
Can the sender just send that segment or does it have to resend all segments? |
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Definition
The receiver will reply with an ACK field equal to the lost segment #.
Can just resend the segment number that was lost, then the sender will wait for an ack # equaling the last good segment received (not the one that was just retransmitted) |
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Term
TCP/IP Basics
What does a sender do, per segment, to ensure it has been recieved? |
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Definition
Per segment, the sender sets a retransmission timer. It awaits ack and if not recieved by the time the timer expires, the TCP sender sends the segment again
[image] |
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Term
TCP/IP Basics
TCP implements flow control by? |
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Definition
| taking advantage of the Sequence and Acknowledgement fileds in the TCP header, along with teh Window field. |
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Term
TCP/IP Basics
Window field implies? |
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Definition
the maximum number of unacknowledged bytes that are allowed to be outstanding at any instant in time
the receiver uses the Window field to tell the sender how much data it can send before it must stop and wait for the next acknowledgment.
[image]
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Term
TCP/IP Basics
What is SYN and ACK? |
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Definition
They are 2 bits inside the flag fields of the TCP header
SYN and ACK flags
SYN means to synchronize the sequence numbers |
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