what is a packet
a small block of data carrying a message (payload) and essential control information (header/footer…)
what is the message called that a packet carries
payload
what is a payload
the message that a packet carries
what is the essential control information that a packet carries
header / footer
source / destination addresses
sequence number
total number of packets
what is step 1 in packet switching
the message is broken down into smaller manageable pieces called packets
what is step 2 in packet switching
addressing happens
what is step 3 in packet switching
these packets are sent individually across the network (sometimes taking different routes)
what is step 4 in packet switching
the packets arrive at the destination, not necessarily in the correct order
what is step 5 in packet switching
the packets are reordered according to their sequence number and reassembled into the original message
what is step 6 in packet switching
a signal is sent to the source address to say it has successfully arrived
what is step 7 in packet switching
throughout the process, the computers and routers check for any errors that may have corrupted the data
why might the packets take different routes
to avoid busy or failed connections
what is the addressing step
each packet is given a header
what does the header contain
source address
destination address
packet number
total number or packets
what is the source address
IP address of computer X
what is the destination address
IP address of computer Y
what is the packet number
sequence number indicating packets order within original message
what is total number of packets
total number of packets that make up the message
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fetch, decode, execute9
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structure of the processor38
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infix and postfix19
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computer architecture57
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types of numbers32
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factors affecting processor performance37
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boolean laws and algebra identities20
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processor interrupts14
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subroutines, structures and built-in functions18
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logic gates25
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storing objects, stack and heap27
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memory allocation19
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network protocols58
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function stubs and passing parameters6
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computer networks31
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packet switching18
