Which IP protocol number is assigned to TCP?

The correct answer is B. 6. The IP protocol number assigned to TCP (Transmission Control Protocol) is 6.

Junos OS Fundamentals

Question

Options

How the community answered

(46 responses)

A
2% (1)
B
91% (42)
C
4% (2)
D
2% (1)

Why each option

The IP protocol number assigned to TCP (Transmission Control Protocol) is 6.

IP protocol number 4 is assigned to IP-in-IP encapsulation, not TCP.

B6Correct

In the IP header, the Protocol field (8-bit) identifies the next-level protocol. TCP (Transmission Control Protocol) is officially assigned the protocol number 6 by the Internet Assigned Numbers Authority (IANA), distinguishing it from other protocols like UDP or ICMP.

C18

IP protocol number 18 is not a commonly used or standard assignment for major transport protocols like TCP.

D17

IP protocol number 17 is assigned to UDP (User Datagram Protocol), not TCP.

Concept tested: IP protocol numbers for TCP

Source: https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml

Topics

#TCP#IP protocol numbers#network fundamentals

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