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A IPv4 packet header consists of how many fields?
12
15
13
14
IPv4 contains 14 fields of which 13 are required. The fields are [1]Version=4 (4 bits), [2]Internet Header Length (IHL=4 bits), [3]Differentiated Services Code Point (DSCP=6 bits), [4]Explicit Congestion Notification (ECN=2 bits), [5]Total length (16 bits), [6]Identification (16 bits), [7]Flags (3 bits), [8]Fragment Offset (13 bits), [9]TTL (8 bits), [10]Protocol (8 bits), [11]Header Checksum (16 bits), [12]Source IP Address (32 bits), [13]Destination Address (32 bits), [14]Options (256 bits - Not required). For more information review: https://en.wikipedia.org/wiki/IPv4 and/or http://study-ccna.com/ip-header/
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