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In IPv4 layer, datagram is of ________

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In IPv4 layer, datagram is of ________

(a) Fixed length

(b) Variable length

(c) Global length

(d) Zero length

This 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

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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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