insert barcode in excel 2016 AAA Authentication Methods in Software

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AAA Authentication Methods
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Non-AAA Authentication Methods
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Login authentication using AAA PPP (Point to Point Protocol) authentication using local password ARA (Apple Remote Access Protocol) authentication using AAA NASI (NetWare Asynchronous Services Interfaces) authentication using AAA Password protection at the privileged level Authentication override Double authentication
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Line password protection Username authentication CHAP (Challenge Handshake Authentication Protocol) or PAP (Password Authentication Protocol) authentication TACACS+ and Extended TACACS+ password protection
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AAA Authentication Methods
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Within the several types of authentication methods are submethods Figure 16-2 lists five AAA authentication methods and their submethods A combination of submethods make up what is called a method list (you'd think it would be called a submethod list, but it's not)
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Figure 16-2: Authentication methods and submethods Each authentication method list can have single or multiple authentication submethods (supported by each particular authentication method) When you define a method_list on the Cisco network hardware, you are defining the login_authentication_ methods to be used and the sequential order in which to use them This ensures a backup for authentication in case the initial method fails Figure 16-3 illustrates the configuration and authentication process for a method_list consisting of multiple authentication submethods, including TACACS+, a local username database, and enable password For this arrangement, the administrator will be authenticated against TACACS+ first If the TACACS+ server fails to respond, then the user will be authenticated against the local username database If the local username database fails to respond, the user is then authenticated against the local enable password These multiple opportunities for authentication will only occur, however, if the authentication service fails to respond If the user generates an error, the authentication process stops and the session is terminated
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Figure 16-3: How method lists work
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Authentication Method Components
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In the following paragraphs we'll take a look at what makes up the authentication submethods Here are definitions of the components: enable Uses enable password for authentication krb5 Uses Kerberos for authentication line Uses the line password for authentication local Uses the local username database for authentication radius Uses RADIUS authentication
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tacacs+ Uses TACACS+ authentication krb5-telnet User Kerberos 5 Telnet authentication protocol when using Telnet to connect guest Allows guest logins auth-guest Allows guest logins only if the administrator has already logged in EXEC if-needed Does not authenticate if administrator has already been authenticated on a TTY line none Uses no authentication
Login Authentication Using AAA
The Login Authentication allows you to create one or more lists of login authentication methods that are tried at login, including: enable Krb5 local line radius tacacs+ ifneeded krb5telnet guest authguest none
To configure Login Authentication using AAA, you need to enable AAA globally, create a list of local authentication methods, enter the line configuration mode for the lines to which you want to apply the authentication list, and then apply the authentication listto a line or set of lines Here are the commands to perform these tasks: Router(config)#aaa new-model Router(config)#aaa authentication login login_authentication_methods Router(config)#line [aux|console|tty|vty] line-number [ending-linenumber] Router(config-line)#login authentication method_list_name
PPP Authentication Using AAA
When a user accesses a network access server (NAS) through a dialup or ISDN connection, the command line interface (CLI) is bypassed completely A network protocol such as Point to Point Protocol (PPP) or Apple Remote Access Protocol (ARAP) is used as soon as the connection is established PPP Authentication provides a variety of authentication methods to be applied to serial interfaces that are running PPP, including the following: enable Krb5 local line radius tacacs+ ifneeded krb5telnet guest authguest none
To configure PPP Authentication using AAA, you need to enable AAA globally, create a PPP authentication list, enter the interface configuration mode for the interface for which you want to apply the authentication list, and apply the authentication list to a line or set of lines Here are the commands used to perform these tasks: Router(config)#aaa new-model Router(config)#aaa authentication ppp method_list_name login_authentication_methods Router(config)#interface interface_type interface_number Router(config-if)#ppp authentication {chap|pap|chap pap |pap chap} [if-needed] method_list_name Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) are standard protocols used to authenticate usernames and passwords Either CHAP PAP or PAP CHAP is selected when Double Authentication is being configured (see upcoming section "Enable Double Authentication") The main differences between PAP and CHAP are as follows:
PAP sends passwords in the cleartext CHAP sends a 64-bit signature instead of the password in the cleartext CHAP requires that two username entries be configured, for both sides (assuming both sides are performing CHAP)
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