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Exam 200-355 topic 1 question 51 discussion

Actual exam question from Cisco's 200-355
Question #: 51
Topic #: 1
[All 200-355 Questions]

A customer has a corporate SSID that is configured to authenticate against an ACS server to validate client credentials on the corporate SSID. The customer has a firewall logically positioned on the network between the WLC and the ACS server in the network architecture. Which port must the firewall allow to ensure that authentication can occur?

  • A. 43
  • B. 1812
  • C. 5146
  • D. 8143
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Suggested Answer: B 🗳️
by aniket2610 at April 30, 2019, 6:58 p.m.

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mueller
5 years, 9 months ago
On all recent RADIUS server implementations, UDP/1812 is the authentication and authorization port, and UDP/1813 is the accouting port. However, in historic RADIUS versions, these ports were different: UDP/1645 for autentication and authorization, and UDP/1646 for accounting. (https://community.cisco.com/t5/routing/which-port-numbers-are-used-for-radius-accounting-and-radius/td-p/2494536)
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aniket2610
6 years, 1 month ago
also, 1812 is Authentication Port & 1813 Authorization Port
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aniket2610
6 years, 1 month ago
ACS Server = RADIUS = 1812 for External-Authentication Port & 1813-Accounting Port
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