IP-1 Lab: Q08 Which Fields Stay Constant? Which fields in this sequence of IP datagrams (containing UDP segments) stay constant?Group of answer choicesVersionHeader ChecksumTime to LiveIdentificationHeader lengthDestination IPDifferentiated ServicesSource IPUpper Layer Protocol
Question
IP-1 Lab: Q08 Which Fields Stay Constant? Which fields in this sequence of IP datagrams (containing UDP segments) stay constant?Group of answer choicesVersionHeader ChecksumTime to LiveIdentificationHeader lengthDestination IPDifferentiated ServicesSource IPUpper Layer Protocol
Solution 1
In a sequence of IP datagrams containing UDP segments, the following fields typically stay constant:
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Version: This field indicates the version of the IP protocol. For IPv4, this is always 4. For IPv6, this is always 6. This field does not change for a sequence of datagrams from the same source to the same destination.
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Header Length: This field indicates the length of the IP header. This is typically constant for a sequence of datagrams from the same source to the same destination.
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Source IP: This field indicates the IP address of the sender. This is constant for a sequence of datagrams from the same source.
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Destination IP: This field indicates the IP address of the receiver. This is constant for a sequence of datagrams to the same destination.
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Upper Layer Protocol: This field indicates the protocol used in the data portion of the IP datagram. For UDP segments, this is always 17. This field is constant for a sequence of datagrams containing data from the same upper layer protocol.
The other fields (Header Checksum, Time to Live, Identification, Differentiated Services) may change from one datagram to another, even in a sequence of datagrams from the same source to the same destination.
Solution 2
In a sequence of IP datagrams containing UDP segments, the following fields typically stay constant:
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Version: This field indicates the version of IP being used. For IPv4, this field is always set to 4. For IPv6, this field is always set to 6.
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Header Length: This field specifies the length of the IP header. This is typically constant unless options are being used.
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Source IP: This field contains the IP address of the sender. This stays constant for all datagrams sent from the same source.
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Destination IP: This field contains the IP address of the receiver. This stays constant for all datagrams sent to the same destination.
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Upper Layer Protocol: This field indicates the protocol used in the data portion of the IP datagram. For UDP segments, this field is set to 17.
The other fields (Header Checksum, Time to Live, Identification, Differentiated Services) can change from one IP datagram to another.
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