300-365 Question #21: Real Exam Question with Answer & Explanation

The correct answer is C: TCP 16113. NMSP (Network Mobility Services Protocol), used for communication between the Cisco MSE and WLC, operates over TCP port 16113, which must be explicitly permitted through any firewall separating the two devices.

Mobility Deployment

Question

You have just added a new MSE to Prime Infrastructure and want to synchronize the MSE with your 5508 WLC. which is located behind a firewall in a DMZ. You notice that NMSP messages are failing between the two devices. What traffic needs to be allowed on the Firewall to ensure the MSE and WLC can communicate using NMSP?

Options

AUDP 16113
BTCP 1613
CTCP 16113
DUDP 1613

Explanation

NMSP (Network Mobility Services Protocol), used for communication between the Cisco MSE and WLC, operates over TCP port 16113, which must be explicitly permitted through any firewall separating the two devices.

Common mistakes.

A. NMSP uses TCP rather than UDP because it requires a reliable, stateful connection for location data exchange - UDP 16113 would not establish the required NMSP session even on the correct port number.
B. Port 1613 is not the correct port for NMSP - the correct port is 16113, and configuring the firewall to allow TCP 1613 would not permit the actual NMSP traffic between the MSE and WLC.
D. UDP 1613 is wrong on two counts - NMSP requires the reliable delivery guarantees of TCP rather than UDP, and the port number 1613 is incorrect as the NMSP listener uses port 16113.

Concept tested. NMSP TCP port requirement for MSE-WLC firewall traversal

Reference. https://www.cisco.com/c/en/us/td/docs/wireless/mse/3355/7-6/MSE_Installation_Guide/MSE_Installation_Guide/MSE_Install_Deploy.html

Topics

#NMSP#MSE#firewall ports#WLC communication

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