UDP Articulation Format
Written on 04:54 by Ahmet Emir
Figure 2.4 acutely illustrates UDP’s clearly low aerial as compared to TCP’s hungry
usage. Look at the amount carefully—can you see that UDP doesn’t use windowing or provide
for acknowledgments in the UDP header?
FIGURE 2 . 4 UDP segment
It’s important for you to accept what anniversary acreage in the UDP articulation is:
Source anchorage Anchorage cardinal of the appliance on the host sending the data
Destination anchorage Anchorage cardinal of the appliance requested on the destination host
Length Length of UDP attack and UDP data
Checksum Checksum of both the UDP attack and UDP abstracts fields
Data Upper-layer data
UDP, like TCP, doesn’t assurance the lower layers and runs its own CRC. Remember that the
Frame Check Arrangement (FCS) is the acreage that houses the CRC, which is why you can see the
FCS information.
The afterward shows a UDP articulation bent on a arrangement analyzer:
UDP - User Datagram Protocol
Source Port: 1085
Destination Port: 5136
Length: 41
Checksum: 0x7a3c
Bit 0 Bit 15
Source anchorage (16) Destination anchorage (16)
Length (16) Checksum (16)
Data (if any)
Bit 16 Bit 31
8 bytes
TCP/IP and the DoD Model 79
UDP Abstracts Area:
..Z......00 01 5a 96 00 01 00 00 00 00 00 11 0000 00
...C..2._C._C 2e 03 00 43 02 1e 32 0a 00 0a 00 80 43 00 80
Frame Check Sequence: 0x00000000
Notice that low overhead! Try to acquisition the arrangement number, ack number, and window size
in the UDP segment. You can’t because they aloof aren’t there!
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