Communication Security

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Questions derived from the CompTIA SY0-101 – Security+ Self Test Software Practice Test.

Objective: Communication Security
SubObjective: Recognize and understand the administration of the following types of remote access technologies: 802.1x, VPN, RADIUS, TACACS, L2TP/PPTP, SSH, IPSEC, Vulnerabilities

Item Number: SY0-
Single Answer, Multiple Choice


Which technology provides centralized remote user authentication, authorization and accounting?



  1. VPN
  2. DMZ
  4. Single sign-on




Remote Authentication Dial-In User Service (RADIUS) provides centralized remote user authentication, authorization, and accounting.


A virtual private network (VPN) is a technology that allows users to access private network resources over a public network, such as the Internet. Tunneling techniques are used to protect the internal resources.


A demilitarized zone (DMZ) is an isolated subnet on a corporate network that contains resources that are commonly accessed by public users, such as Internet users. The DM is created to isolate those resources to ensure that other resources that should remain private are not compromised. A DMZ is usually implemented with the use of firewalls.


Single sign-on is a feature whereby a user logs in once to access all network resources.


RADIUS is defined by RFC 2138 and 2139. A RADIUS server acts either as the authentication server or as a proxy client that forwards client requests to other authentication servers. The initial network access server, which is usually a VPN server or dial-up server, acts as a RADIUS client by forwarding the VPN or dial-up client’s request to the RADIUS server. RADIUS is the protocol that carries the information between the VPN or dial-up client, the RADIUS client, and the RADIUS server.


The centralized authentication, authorization, and accounting features of RADIUS allow central administration of all aspects of remote login. The accounting features allow administrators to track usage and network statistics by maintaining a central database.


Reference:, RADIUS,

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