(Fragmentation) Suppose that host A is connected to a router R1, R1 is connected
ID: 3934038 • Letter: #
Question
(Fragmentation)
Suppose that host A is connected to a router R1, R1 is connected to another router R2, and R2 is connected to host B. Suppose that a TCP message that contains 900 bytes of data and 20 bytes of TCP header is passed to the IP (IPv4) code at host A for delivery to B. Assume that link A-R1 can support a maximum frame size of 1024 bytes including a 14-byte frame header, link R1-R2 can support a maximum frame size of 512 bytes, including an 8 byte-frame header, and link R2-B can support a maximum frame size of 512 bytes, including a 12-byte frame header. Assume a 20 byte IPv4 header.
Up to how many bytes of IP packets can each of the three links carry?
Explanation / Answer
Link A-R1:
Having Length = 940
ID = x
DF = 0
MF = 0
Offset = 0
Link R1-R2:
(a)
Length = 500
ID = x
DF = 0
MF = 1
Offset = 0
(b)
Length = 460;
ID = x
DF = 0
MF = 0
Offset = 60
Link R2-B:
(a)
Length = 500
ID = x
DF = 0
MF = 1
Offset = 0
(b)
Length = 460
ID = x
DF = 0
MF = 0
Offset = 60
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