C6 Flashcards

1
Q

what OH fields are copied from IH

A

TOS, DF

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2
Q

What fields of IH are not the same as original datagram

A

TTL, Checksum

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3
Q

TTL inner header

A

at the start of tunnel, TTL is decreased by 1

if TTL is not 0, it is inserted into IH
checksum is re calculated

otherwise, if ttl is 0 no more ip in ip encapsulation and an ICMP message is sent back to the source

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4
Q

what is flow control?

A

a faster sender will not congest a slower receiver

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5
Q

What is the reliability of a protocol?

A

low error rate, retransmission in case of errors

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6
Q

What is the TCP header length?

A

20 bytes - 60 bytes

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7
Q

Source port TCP header

A

16 bit TSAP
source socket = source ip address + source port + communication descriptor

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8
Q

Destination port TCP header

A

16 bit TSAP
destination socket = destination IP address + destination port + communication descriptor

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9
Q

Sequence Number TCP header

A

32 bit, referes to the first data byte of the current TCP segment

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10
Q

ACK number TCP header

A

piggybacking acknowledgement referring the next data byte expected

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