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Study Stuff for MCA Examinations - NIMCET
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Previous Year Question (PYQs)
An IPv4 packet has arrived with the first few hexadecimal digits as shown below. How many hops can this packet travel before being dropped? The data belongs to what upper-layer protocol?
$(5400001800100110040601\ldots)_{16}$
Solution
Convert header bytes of IPv4 packet:
Hex sequence (grouped in bytes):
54 00 00 18 00 10 01 10 04 06 01 ...
Important fields:
• TTL (Time To Live) field = 04 (in hex)
TTL = 4 → packet can travel 4 hops before being discarded.
• Protocol field = 06 (in hex)
Protocol number 6 corresponds to TCP.
Therefore:
TTL = 4 hops
Protocol = TCP
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