Chapter_3_AAA
Which solution supports AAA for both RADIUS and TACACS+ servers? > Implement Cisco Secure Access Control System (ACS) only. > RADIUS and TACACS+ servers cannot be supported by a single solution. > Implement a local database. > Implement both a local database and Cisco Secure > Access Control System (ACS).
> Implement Cisco Secure Access Control System (ACS) only.* (Cisco Secure Access Control System (ACS) supports both TACACS+ and RADIUS servers.)
When a method list for AAA authentication is being configured, what is the effect of the keyword local? > The login succeeds, even if all methods return an error. > It uses the enable password for authentication. > It accepts a locally configured username, regardless of case > It defaults to the vty line password for authentication.
> It accepts a locally configured username, regardless of case* (In defining AAA authentication method list, one option is to use a preconfigured local database. There are two keywords, either of which enables local authentication via the preconfigured local database. The keyword local accepts a username regardless of case, and the keyword local-case is case-sensitive for both usernames and passwords)
Which characteristic is an important aspect of authorization in an AAA-enabled network device? > The authorization feature enhances network performance. > User access is restricted to certain services. > User actions are recorded for use in audits and troubleshooting events. > A user must be identified before network access is granted.
> User access is restricted to certain services.* (Authorization is the ability to control user access to specific services. Authentication is used to verify the identity of the user. The accounting feature logs user actions once the user is authenticated and authorized.)
What difference exists when using Windows Server as an AAA server, rather than Cisco Secure ACS? > Windows Server requires more Cisco IOS commands to configure. > Windows Server only supports AAA using TACACS. > Windows Server uses its own Active Directory (AD) controller for authentication and authorization. > Windows Server cannot be used as an AAA server.
> Windows Server uses its own Active Directory (AD) controller for authentication and authorization.* (The Cisco IOS configuration is the same whether communicating with a Windows AAA server or any other RADIUS server.)
Which component of AAA allows an administrator to track individuals who access network resources and any changes that are made to those resources? > accounting > accessibility > authentication > authorization
> accounting*
Because of implemented security controls, a user can only access a server with FTP. Which AAA component accomplishes this? > accounting > accessibility > auditing > authorization > authentication
> authorization* (authorization services determine which resources the user can access and which operations the user is allowed to perform.)
Which debug command is used to focus on the status of a TCP connection when using TACACS+ for authentication? > debug tacacs events > debug tacacs > debug tacacs accounting > debug aaa authentication
> debug tacacs events* (The debug tacacs events command displays the opening and closing of a TCP connection to a TACACS+ server, the bytes that are read and written over the connection, and the TCP status of the connection.)
True or False?The single-connection keyword prevents the configuration of multiple TACACS+ servers on a AAA-enabled router. > false > true
> false*
Which authentication method stores usernames and passwords in the router and is ideal for small networks? > local AAA > server-based AAA > server-based AAA over TACACS+ > local AAA over TACACS+ > local AAA over RADIUS > server-based AAA over RADIUS
> local AAA*
Which authentication method stores usernames and passwords in their router and is ideal for small networks. > local AAA over TACACS+ > server-based AAA over TACACS+ > local AAA > local AAA over RADIUS > server-based AAA over RADIUS > server-based AAA
> local AAA*
Which two features are included by both TACACS+ and RADIUS protocols? (Choose two.) > 802.1X support > separate authentication and authorization processes > SIP support > password encryption > utilization of transport layer protocols
> password encryption* > utilization of transport layer protocols*
What device is considered a supplicant during the 802.1X authentication process? > the client that is requesting authentication > the switch that is controlling network access > the router that is serving as the default gateway > the authentication server that is performing client authentication
> the client that is requesting authentication*
When using 802.1X authentication, what device controls physical access to the network, based on the authentication status of the client? > the router that is serving as the default gateway > the authentication server > the switch that the client is connected to > the supplicant
> the switch that the client is connected to* (The devices involved in the 802.1X authentication process are as follows:The supplicant, which is the client that is requesting network accessThe authenticator, which is the switch that the client is connecting and that is actually controlling physical network accessThe authentication server, which performs the actual authentication)
Why is authentication with AAA preferred over a local database method? > It provides a fallback authentication method if the administrator forgets the username or password. > It uses less network bandwidth. > It specifies a different password for each line or port. > It requires a login and password combination on the console, vty lines, and aux ports.
> It provides a fallback authentication method if the administrator forgets the username or password.* (The local database method of authentication does not provide a fallback authentication method if an administrator forgets the username or password. Password recovery will be the only option. When authentication with AAA is used, a fallback method can be configured to allow an administrator to use one of many possible backup authentication methods)
What is a characteristic of AAA accounting? > Possible triggers for the aaa accounting exec default command include start-stop and stop-only.* > Accounting can only be enabled for network connections. > Accounting is concerned with allowing and disallowing authenticated users access to certain areas and programs on the network. > Users are not required to be authenticated before AAA accounting logs their activities on the network.
> Possible triggers for the aaa accounting exec default command include start-stop and stop-only.*
What protocol is used to encapsulate the EAP data between the authenticator and authentication server performing 802.1X authentication? > SSH > MD5 > TACACS+ > RADIUS
> RADIUS*
What is a characteristic of TACACS+? > TACACS+ uses UDP port 1645 or 1812 for authentication, and UDP port 1646 or 1813 for accounting. > TACACS+ is backward compatible with > TACACS and XTACACS. > TACACS+ is an open IETF standard. > TACACS+ provides authorization of router commands on a per-user or per-group basis.
> TACACS+ provides authorization of router commands on a per-user or per-group basis.* (The TACACS+ protocol provides flexibility in AAA services. For example, using TACACS+, administrators can select authorization policies to be applied on a per-user or per-group basis.)
Which server-based authentication protocol would be best for an organization that wants to apply authorization policies on a per-group basis? > SSH > RADIUS > ACS > TACACS+
> TACACS+*
Why would a network administrator include a local username configuration, when the AAA-enabled router is also configured to authenticate using several ACS servers? > Because ACS servers only support remote user access, local users can only authenticate using a local username database. > A local username database is required when configuring authentication using ACS servers. > The local username database will provide a backup for authentication in the event the ACS servers become unreachable. > Without a local username database, the router will require successful authentication with each ACS server.
> The local username database will provide a backup for authentication in the event the ACS servers become unreachable.*
Refer to the exhibit. Router R1 has been configured as shown, with the resulting log message. On the basis of the information that is presented, which two statements describe the result of AAA authentication operation? (Choose two.) > The locked-out user stays locked out until the clear aaa local user lockout username Admin command is issued. > The locked-out user stays locked out until the interface is shut down then re-enabled. > The locked-out user is locked out for 10 minutes by default. > The locked-out user should have used the username admin and password Str0ngPa55w0rd. > The locked-out user failed authentication.
> The locked-out user stays locked out until the clear aaa local user lockout username Admin command is issued.* > The locked-out user failed authentication.* (The aaa local authentication attempts max-fail command secures AAA user accounts by locking out accounts that have too many failed attempts. After the condition is reached, the user account is locked. The user account in effect stays locked out until the status is cleared by an administrator.)
Refer to the exhibit. Which statement describes the configuration of the ports for Server1? > The configuration using the default ports for a Cisco router. > The configuration of the ports requires 1812 be used for the authentication and the authorization ports. > The configuration will not be active until it is saved and Rtr1 is rebooted. > The ports configured for Server1 on the router must be identical to those configured on the RADIUS server.
> The ports configured for Server1 on the router must be identical to those configured on the RADIUS server.*
What is the result of entering the aaa accounting network command on a router? > The router collects and reports usage data related to network-related service requests. > The router outputs accounting data for all EXEC shell sessions. > The router provides data for only internal service requests. > The router outputs accounting data for all outbound connections such as SSH and Telnet.
> The router collects and reports usage data related to network-related service requests.* (The three parameters that can be used with aaa accounting are:network- runs accounting for all network-related service requests, including PPPexec- runs accounting for all the EXEC shell sessionconnection - runs accounting on all outbound connections such as SSH and Telnet )
A user complains about being locked out of a device after too many unsuccessful AAA login attempts. What could be used by the network administrator to provide a secure authentication access method without locking a user out of a device? > Use the login delay command for authentication attempts. > Use the login local command for authenticating user access. > Use the aaa local authentication attempts max-fail global configuration mode command with a higher number of acceptable failures. > Use the none keyword when configuring the authentication method list.
> Use the login delay command for authentication attempts.* (The login delay command introduces a delay between failed login attempts without locking the account. This provides a user with unlimited attempts at accessing a device without causing the user account to become locked and thus requiring administrator intervention.)
A user complains about not being able to gain access to a network device configured with AAA. How would the network administrator determine if login access for the user account is disabled? > Use the show aaa local user lockout command. > Use the show running-configuration command. > Use the show aaa sessions command. > Use the show aaa user command.
> Use the show aaa local user lockout command.*
