IT 210 please I need the solution computerized keyboard not on paper alike handw

Question

IT 210 please I need the solution computerized keyboard not on paper alike handwriting COMPUTER NETWORK 4700 0064 4a99 0000 8011 f2 … An IPv4 packet has arrived with the first few hexadecimal digits as shown. 1)     How many bytes of data are being carried by this packet? Answer should be in decimal. 4700 0064 4a99 0000 8011 f2 … 4700 0064 4a99 0000 8011 f2 … 2)     How may hops can the packet travel before being dropped? Answer should be in decimal. 3)     What upper-layer does the data belong to?

Explanation / Answer

An IPv4 packet has arrived with the first few hexadecimal digits as shown. 4700 0064 4a99 0000 8011 f2 …

Given IPv4 packet - 4700 0064 4a99 0000 8011 f2 …

1) The header is 0x7, 7*4 = 28 bytes and total length is 0x0064 = 100 in decimal, the bytes of data being carried by

this packet is 100-28 = 72 bytes.

2) To find the time-to-live field, skip the first 16 hexadecimal digits, and then the time-to-live field is found at ninth

byte, which is 80. The packet can travel 80 hops before getting dropped in hexadecimal , In decimal it is 128

hops.

3) The protocol field is the next byte which is 11 in hexadecimal, that is 17 in decimal and it is the protocol number

of UDP, Therefore the data belongs to upper layer UDP.

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