Computer Science

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Version
Version no. of Internet Protocol used (e.g. IPv4).
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IHL
Internet Header Length; Length of entire IP header
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DSCP
Differentiated Services Code Point; this is Type of Service
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ECN
Explicit Congestion Notification; It carries information about the congestion seen in the route
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Total Length
Length of entire IP Packet (including IP header and IP Payload)
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Identification
If IP packet is fragmented during the transmission, all the fragments contain same identification number. to identify original IP packet they belong to
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Flags
As required by the network resources, if IP Packet is too large to handle, these ‘flags’ tells if they can be fragmented or not. In this 3-bit flag, the MSB is always set to ‘0’
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Fragment Offset
This offset tells the exact position of the fragment in the original IP Packet
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Time to Live
To avoid looping in the network,every packet is sent with some TTL value set, which tells the network how many routers (hops) this packet can cross. At each hop, its value is decremented by one and when the value reaches zero, the packet is discarded
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Protocol
Tells the Network layer at the destination host, to which Protocol this packet belongs to, i.e. the next level Protocol. For example protocol number of ICMP is 1, TCP is 6 and UDP is 17
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Header Checksum
This field is used to keep checksum value of entire header which is then used to check if the packet is received error-free
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Source Address
32-bit address of the Sender (or source) of the packet
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Destination Address
32-bit address of the Receiver (or destination) of the packet
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Options
This is optional field, which is used if the value of IHL is greater than 5. These options may contain values for options such as Security, Record Route, Time Stamp, etc
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Other cards in this set

Card 2

Front

Internet Header Length; Length of entire IP header

Back

IHL

Card 3

Front

Differentiated Services Code Point; this is Type of Service

Back

Preview of the back of card 3

Card 4

Front

Explicit Congestion Notification; It carries information about the congestion seen in the route

Back

Preview of the back of card 4

Card 5

Front

Length of entire IP Packet (including IP header and IP Payload)

Back

Preview of the back of card 5
View more cards

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