Which protocol must be allowed on the firewall so that NTP services work properly?

The correct answer is D. UDP. NTP (Network Time Protocol) uses UDP port 123 for time synchronization. NTP uses UDP because it is connectionless and lightweight - time sync requires low overhead and does not need the reliability guarantees of TCP. Option A (TCP) is incorrect; NTP does not use TCP. Option B…

Network Fundamentals

Question

Options

ATCP
BICMP
CBGP
DUDP

How the community answered

(50 responses)

A
2% (1)
B
6% (3)
C
4% (2)
D
88% (44)

Explanation

NTP (Network Time Protocol) uses UDP port 123 for time synchronization. NTP uses UDP because it is connectionless and lightweight - time sync requires low overhead and does not need the reliability guarantees of TCP. Option A (TCP) is incorrect; NTP does not use TCP. Option B (ICMP) is the ping/traceroute protocol, unrelated to NTP. Option C (BGP) is a routing protocol that runs over TCP port 179, also unrelated to NTP.

Topics

#NTP#UDP#Firewall rules#Networking protocols

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