Question

In an IP packet, the value of HLEN is 5, and the value of the TOTAL LENGTH field is 1000 (in decimal). The number of data bytes in the packet will be ________

Answer 1

Answer:

980

Explanation:

Number of bytes in the header = 5*4 = 20 bytes

Number of bytes of data = Total length - header bytes

                                         = 1000 - 20

                                         = 980 bytes.

Answer 2

In an IP packet, the value of HLEN is 5, and the value of the TOTAL LENGTH field is 1000 (in decimal). The number of data bytes in the packet will be 980 bytes.

Explanation:

• The information between Networks is transferred in forms of Packet.

• These Packets have a Format which is known as the IP Datagram.

• The Fields in the IP datagram are  Header Length, Version (IPv4 or IPv6), Total Length, Service Type and Time to Live.

• The Header Length is 4 bits. So it can have a minimum value of 5 and a maximum value 15.

• As per the Question , Header length is 5 .i.e HLEN = 5

• So, Length of Header = $5 \times 4$ = 20 bits. Also, the Total Length is 1000

Using the Formula ,

     Total Length of datagram = Length of Header + Length of data

      1000 = 20 + Length of data

      So, Length of data =   1000 - 20 = 980 bytes

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