Aspire Faculty ID #17388 · Topic: UGC NET Computer Science June 2024 (Paper II) · Just now
UGC NET Computer Science June 2024 (Paper II)

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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