Please enable JavaScript.

Coggle requires JavaScript to display documents.

7.Intro to WAN HDLC | PPP | PPPoE Layer 2 - Coggle Diagram

- - - - Sychronous
        in Synchronous Net we have 2 ends > one end is DCE Data CircuitTerminating Equipment and the other end is DTE DataTerminalEquipment
        and we must have a clock for the synchronization betwenn the 2 ends
        in this Net the Data unit will be the frame soo frame can be whatever size it must be // Flags are used to mark the Start and end of 1 Frame
        Frame >> Flag Data Flag
      - ASychronous
        when we send the data > the sending unit is the byte which means every time we can send one byte of data and in these bytes we must mark the start of the byte and the stop >> soo lot of start and stops bits > lot of ports for thiese data >> not very efficient
        1 Byte >> Stop Data Start
    - - Address (link layer address of the frame)
      - Control > type of frame > I Information / S Supervisory / U Unnumbered
      - Flag (start)
      - Information
      - FCS
      - Flag (end)
    - - Components of PPP
        Name > Function
        PPP encapsulation Method > format used when supporting upper layer ps such as IP IPX
        LCP Link Control P > method of establishing configuring and negotiating and testing the data-link connection
        NCP Net Control P > set of Ps for establishing a connction and negotiating params for diffrent Net-layer ps
      - PPP Link Establishemnt Process
        
        Dead
        
        LInk UP >Establish
        using LCP to nego link layer parsms
        such as magic number and auth type
        
        FAIL > Dead
        
        Opened > Athenticat
        
        FAIL > Terminate
        
        SUCCESS/NONE > Network
        using the NCP to negotiate the Net Layer P
        such as IP address
        
        When Closing > Terminate
        
        1 more item...
      - PPP Frame
        
        Address
        
        Control
        
        Protocol
        
        Information
        
        Code
        
        Data
        
        Length
        
        Identifier
        
        FCS
        
        Flag
        
        Flag
      - Packet Type Used in LCP negotiation
        using PacketTypes to Negotiate link layer
        Configure-Request
        Configure-Ack
        Configure-Nck
        Configure-Reject
        Common Link Params of LCP Negotiations
        PArameter (Default)
        MRU Maximum Recieve Unit (1500) > total len of the into and padding field for the ppp frame
        Authentification Protocol (No Auth) > used by the peer
        Magic-Number (Enable) > generated randomly used for link-loop detection
        LCP Link Parameter Negotiation
        successful PPP negotiations result in a Configure-Ack reply to a Configure-Request packet
        Configure-Nak packets are generated where params are recognized but not all are accepted
        Configure-Reject packets are generated where not all params are recognized by the peer
      - PPP Authentification Modes
        
        PAP
        one side Router B is authenticated and the other side Router B is the Authenticator > Router B sends Authentication Request containing username and passwd in plaintect and Router A check and sends Authenticate Ack / if not Nak
        The Password Athentification P relies on the transmission of a passwd over the link for peer authentification
        
        CHAP
        more secure uses 3way handshake
        Router A Authenticator sends the Challenge packet tp Router B > challenge packet dosent contain any passwd > contains a sequence number which Router B will use with its passwork to md5 calculation that will be sent back as reponse to Router A to check the validity of the Encrypted passwd >> success/Failiure
        The Challenge HandShake Authentication Protocol relies on a challenge and challenge response for peer authentication
      - IPCP Address Negotiation
        
        IPCP Static Address Negotiation
        NCP dep on what kind of P is used for ip addressing soo the NCP P will be IPCP p
        soo IPCP will help us to negotiate the IP address of each Router btw each other
        The internet Protocol Control Protocol IPCP is the Network Control P NCP used for establishing and configuring IP
        
        IPCP Dynamic Address Negotiation
        sometimes IPCP can also help us to obtain t he Ip address from the remote site
  - - - PPP Basic Configuraiton
        [RT]>interface Serial 1/0/0
        [RT-Serial1/0/0]>link-protocol ppp (ppp by default)
        [RT-Serial1/0/0]>ip address 10.0.1.1 30 (for the interface)
      - Authentification
        
        Configuring PAP Auth
        Authenticator
        [RT]>aaa
        [RTA-aaa]>local-user userName password cipher passwd
        [RTA-aaa]>local user userName service-type ppp
        [RTA]>interface Serial 1/0/0
        [RTA-Serial1/0/0]>link-protocol ppp
        [RTA-Serial1/0/0]>ppp authentication-mode pap
        [RTA-Serial1/0/0]>ip address 10.1.1.1 30
        Authenticated
        [RTB]>interface Serial 1/0/0
        [RTB-Serial1/0/0]>link-protocol ppp
        [RTB-Serial1/0/0]>ppp pap local-user userName password cipher passwd
        [RTB-Serial1/0/0]>ip address 10.1.1.2 30
        Validation
        [RTB]>debugging ppp pap all
        
        CHAP Authentification
        Authenticator
        [RT]>aaa
        [RTA-aaa]>local-user userName password cipher passwd
        [RTA-aaa]>local user userName service-type ppp
        [RTA]>interface Serial 1/0/0
        [RTA-Serial1/0/0]>link-protocol ppp
        [RTA-Serial1/0/0]>ppp authentication-mode chap
        Authenticated
        [RTB]>interface Serial 1/0/0
        [RTB-Serial1/0/0]>link-protocol ppp
        [RTB-Serial1/0/0]>ppp chap user userName
        [RTB-Serial1/0/0]>ppp chap password cipher passwd
        Validation
        [RTB]>debugging ppp chap all
- - - - Packet
        
        IP
        
        Data
        
        PPP (2 bytes)
        
        TCP
        
        PPPoE (6 bytes)
        
        Ethernet (14 bytes)
        
        FCS (4 bytes)