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Match the following:

FieldLength in bits
P. UDP Header's Port NumberI. 48
Q. Ethernet MAC AddressII. 8
R. IPv6 Next HeaderIII. 32
S. TCP Header's Sequence NumberIV. 16

  • A.P-III, Q-IV, R-II, S-I
  • B.P-II, Q-I, R-IV, S-III
  • C.P-IV, Q-I, R-II, S-III
  • D.P-IV, Q-I, R-III, S-II

Answer: C

The correct matching is P-IV, Q-I, R-II, S-III.

  • P: a UDP port number is 16 bits, so ports run from 0 to 65535 (IV).
  • Q: an Ethernet MAC address is 48 bits, six bytes (I).
  • R: the IPv6 Next Header field is 8 bits, using the same protocol numbers as the IPv4 Protocol field (II).
  • S: the TCP sequence number is 32 bits (III).

The other options misplace at least one: P-III makes the port 32 bits, P-II makes it 8 bits, and R-III with S-II would give IPv6 a 32-bit next header and TCP an 8-bit sequence number.

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