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Which protocol is used to provide authentication across a point to point link using PPP quizlet?

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    Prerequisite – TACACS+, and RADIUS 
    To provide a centralized management system for the authentication, authorization, and accounting (AAA framework), Access Control Server (ACS) is used. For the communication between the client and the ACS server, two protocols are used namely TACACS+ and RADIUS. 

    TACACS+ 
    Terminal Access Controller Access Control System (TACACS+) is a Cisco proprietary protocol that is used for the communication of the Cisco client and Cisco ACS server. It uses TCP port number 49 which makes it reliable. 

    RADIUS – 
    Remote Access Dial-In User Service (RADIUS) is an open standard protocol used for the communication between any vendor AAA client and ACS server. If one of the clients or servers is from any other vendor (other than Cisco) then we have to use RADIUS. It uses port number 1812 for authentication and authorization and 1813 for accounting. 

    Similarities – 
    The process is started by Network Access Device (NAD – client of TACACS+ or RADIUS). NAD contact the TACACS+ or RADIUS server and transmit the request for authentication (username and password) to the server. First, NAD obtains the username prompt and transmits the username to the server, and then again the server is contacted by NAD to obtain the password prompt and then the password is sent to the server. 

    The server replies with an access-accept message if the credentials are valid otherwise send an access-reject message to the client. Further authorization and accounting are different in both protocols as authentication and authorization are combined in RADIUS. 

    Differences – 

    TACACS+ RADIUS
    Cisco proprietary protocol open standard protocol
    It uses TCP as a transmission protocol It uses UDP as a transmission protocol
    It uses TCP port number 49. It uses UDP port number 1812 for authentication and authorization and 1813 for accounting.
    Authentication, Authorization, and Accounting are separated in TACACS+. Authentication and Authorization are combined in RADIUS.
    All the AAA packets are encrypted. Only the password is encrypted while the other information such as username, accounting information, etc are not encrypted.
    preferably used for ACS. used when ISE is used
    It provides more granular control i.e can specify the particular command for authorization. No external authorization of commands is supported.
    TACACS+ offers multiprotocol support No multiprotocol support.
    Used for device administration. used for network access

    Advantages (TACACS+ over RADIUS) – 
     

    1. As TACACS+ uses TCP therefore more reliable than RADIUS. 
       
    2. TACACS+ provides more control over the authorization of commands while in RADIUS, no external authorization of commands is supported. 
       
    3. All the AAA packets are encrypted in TACACS+ while only the passwords are encrypted in RADIUS i.e more secure. 
       

    Advantage (RADIUS over TACACS+) – 
     

    1. As it is an open standard therefore RADIUS can be used with other vendor’s devices while because TACACS+ is Cisco proprietary, it can be used with Cisco devices only. 
       
    2. It has more extensive accounting support than TACACS+. 
       

    Introduction

    PPP is a non-proprietary WAN data-link layer encapsulation protocol which can be viewed as an enhancement of HDLC as it embeds many additional features when compared with HDLC:

    • PPP Authentication. Supported authentication protocols are PAP and CHAO
    • Compression
    • Error detection
    • Multilink to provide load-balancing over multiple network interfaces

    Network diagram

    Packet Tracer 5.3 - PPP configuration lab network diagram

    Lab instructions

    This lab will test your ability to configure PPP on a serial link in Packet Tracer 8.0. Practicing this labs will help you to better understand what is a DCE, a DTE, and aclock rates on a serial router interconnection and make you ready for the CCNA ppp labs and simlets.

    1. Use the connected laptops to find the DCE and DTE routers. You can connect to the routers using CLI.

    2. Configure the routers with the following parameters :

    - Clock : 250000
    - PPP link between the routers
    - DCE IP : 192.168.10.5/30

    - DTE IP : 192.168.10.6/30

    3. Check IP connectivity between the two routers using the ping command.

    Lab solution

    1. Use the connected laptops to find the DCE and DTE routers

    The show controllers <serial interface> command is used to determine which side of the cable is the DCE side.

    In this example, Router-A is the DTE side, and Router-B the DCE side (DCE V.35, clock rate set).

    Router-A#show controllers serial 0/0/0
Interface Serial0/0/0
Hardware is PowerQUICC MPC860
DTE V.35 TX and RX clocks detected

Router-B#show controllers serial 0/0/0
Interface Serial0/0/0
Hardware is PowerQUICC MPC860
DCE V.35, clock rate 2000000

    2. Configure the routers with the following parameters

    Router-B beeing the DCE, clock rate has to be configured on Router-B serial 0/0/0 interface

    Router-B(config)#interface serial 0/0/0
Router-B(config-if)#clock rate 250000

    Then, configure PPP encapsulation and IP address on Router-B serial 0/0/0 interface. The encapsulation ppp configures PPP protocol on the serial interface. PPP authenication can be oprtionnally configured using the following IOS commands which are not used in this lab :

    • ppp authentication : Set PPP link authentication method
    • ppp pap:  Set PAP authentication parameters

    Router-B beeing the DCE side of the serial link, the 192.168.10.5/30 IP address is configured on Router-B serial 0/0/0 interface. Don't forget to enable the interface with a no shutdown command.

    Router-B(config)#interface serial 0/0/0
Router-B(config-if)#encapsulation ppp
Router-B(config-if)#ip address 192.168.10.5 255.255.255.252
Router-B(config-if)#no shutdown

    The show interfaces serial 0/0/0 confirms that PPP encapsulation is enabled on the interface : Encapsulation PPP, loopback not set, keepalive set (10 sec)

    Router-B#show interfaces serial 0/0/0
Serial0/0/0 is up, line protocol is up (connected)
  Hardware is HD64570
  Internet address is 192.168.10.5/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set, keepalive set (10 sec)
  Last input never, output never, output hang never
  [...]

    Finally, configure PPP encapsulation and IP address on Router-A serial 0/0/0 interface. The link becomes up as both routers are correctly configured.

    Router-A(config)#interface serial 0/0/0
Router-A(config-if)#encapsulation ppp
Router-A(config-if)#ip address 192.168.10.6 255.255.255.252
Router-A(config-if)#no shutdown

%LINK-5-CHANGED: Interface Serial0/0/0, changed state to up

    3. Check IP connectivity between the two routers using the ping command.

    Issue a ping from Router-A to Router-B to test network connectivity between the two routers.

    Router-A#ping 192.168.10.5

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.10.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/3/4 ms

    Which two protocols provide authentication services for PPP choose two?

    Two authentication choices are Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). Compression: Increases the effective throughput on PPP connections by reducing the amount of data in the frame that must travel across the link.

    Which protocol is used by PPP to provide authentication and protection from playback attacks select one?

    PAP (Password Authentication Protocol) PPP defines an extensible LCP that allows negotiation of an authentication protocol for authenticating its peer before allowing Network layer protocols to transmit over the link. RFC 1334 defines two protocols for authentication. PAP is a very basic two-way process.

    Which of the following can be used by PPP for authentication?

    The calling machine on a PPP link is considered the authenticatee because the caller must prove its identity to the remote peer. The peer is considered the authenticator.

    What is the PPP Point to Point Protocol and how does it work quizlet?

    what is PPPoE? PPPoE (Point-to-Point Protocol over Ethernet) is a specification for connecting multiple computer users on an Ethernet local area network to a remote site through common customer premises equipment, which is the telephone company's term for a modem and similar devices.

    protocol provide authentication point point link ppp quizlet

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