Network Protocols, SDLC & ITSM.

Running head: Network Protocols, SDLC & ITSM
Network Protocols, SDLC & ITSM
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Network Protocols, SDLC & ITSM1
1. A station running TCP/IP needs to transfer a file to a host. The file contains 1024
bytes. How many bytes, including all of the TCP/IP overhead, would be sent, assuming
a payload size of 128 bytes and both systems are running IPv4? (Also assume that the
three-way handshake and window size negotiation have been completed and that no
errors occur during transmission.)
Given data:
File size = 1024 bytes
Payload size = 128 bytes.
TCP header contains 20 bytes
IPv4 header contains 20 bytes.
So total TCP/IP header contains 40 (20 + 20) bytes.
Divide 1024 bytes into 8 segments, each 128 bytes.
Then,
So total 1344 bytes will be sent that also includes the entire TCP/IP overhead.
i) what is the protocol overhead (stated as a percentage)? [3 marks]
Given data: IPv4 percentage overhead:
Total overhead in eight segments: 8*40= 320 bytes

Network Protocols, SDLC & ITSM2
Total data sent: 1024 bytes
Percentage overhead: (320/1024)*100= 31.25%
ii) perform the same calculation, this time assuming that both clients are using IPv6. [2
marks]
File size = 1024 bytes
Payload size = 128 bytes.
TCP header contains 30 bytes
IPv6 header contains 30 bytes.
So total TCP/IP header contains 60 (30 + 30) bytes.
Divide 1024 bytes into 8 segments, every 128 bytes.
Then,
(60+128)*8= 1504 bytes
So total 1504 bytes will be sent including the entire TCP/IP overhead.
Protocol overhead:
IPv6 percentage overhead:
Total overhead in eight segments: 8*60= 480 bytes
Total data sent: 1024 bytes
Percentage overhead: (480/1024)*100= 46.87%
2. IP is a connection-less protocol, whereas TCP is connection-oriented. How can these
two protocols coexist in the same protocol stack? [4 marks]