In IPv4 layer, datagram is of ________(a) Fixed length(b) Variable length(c) Global length(d) Zero lengthThis question was posed to me in an online interview.I'm obligated to ask this question of Network Protocols in section Network Protocol of Wireless/Mobile

In IPv4 layer, datagram is of ________(a) Fixed length(b) Variable len

1.	In IPv4 layer, datagram is of ________(a) Fixed length(b) Variable length(c) Global length(d) Zero lengthThis question was posed to me in an online interview.I'm obligated to ask this question of Network Protocols in section Network Protocol of Wireless/Mobile
Answer» The correct answer is (b) Variable length Easy explanation: ‘IPv4 is a connectionless protocol used for PACKET switched networks. It operates on BEST effort DELIVERY model, in which neither delivery is guaranteed, nor proper sequencing or avoidance of duplicate delivery is assured. The size of the DATAGRAM header can be of variable length from 20 bytes to 60 bytes.’

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