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Point-to-Point Protocol

August 5th, 2017 in ROUTE 300-101 Go to comments

If you are not sure about PPP and PPPoE, please read my PPP tutorial and PPPoE tutorial.

Question 1

Explanation

Password Authentication Protocol (PAP) is a very basic two-way process. The username and password are sent in plain text, there is no encryption or protection. If it is accepted, the connection is allowed. The configuration below shows how to configure PAP on two routers:

R1(config)#username R2 password digitaltut1
R1(config)#interface s0/0/0
R1(config-if)#encapsulation ppp
R1(config-if)#ppp authentication PAP
R1(config-if)#ppp pap sent-username R1 password digitaltut2
R2(config)#username R1 password digitaltut2
R2(config)#interface s0/0/0
R2(config-if)#encapsulation ppp
R2(config-if)#ppp authentication PAP
R2(config-if)#ppp pap sent-username R2 password digitaltut1

Note: The PAP “sent-username” and password that each router sends must match those specified with the “username … password …” command on the other router.

Question 2

Explanation

Challenge Handshake Authentication Protocol (CHAP) periodically verifies the identity of the client by using a three-way handshake. The three-way handshake steps are as follows:

1. When a client contacts a server that uses CHAP, the server (called the authenticator) responds by sending the client a simple text message (sometimes called the challenge text). This text is not important and it does not matter if anyone can intercepts it.
2. The client then takes this information and encrypts it using its password which was shared by both the client and server. The encrypted text is then returned to the server.
3. The server has the same password and uses it as a key to encrypt the information it previously sent to the client. It compares its results with the encrypted results sent by the client. If they are the same, the client is assumed to be authentic.

Note: PPP supports two authentication protocols: PAP and CHAP.

Question 3

Question 4

Explanation

PPP supports two authentication protocols: Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). PAP authentication involves a two-way handshake where the username and password are sent across the link in clear text. For more information about PPP Authentication methods, please read Point to Point Protocol (PPP) Tutorial

Question 5

Question 6

Question 7

Comments
  1. cisco_exam
    January 20th, 2017

    guys it looks like the exam has been changed

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    February 1st, 2017

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    February 1st, 2017

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  4. Jane woken
    February 2nd, 2017

    can somebody tell me please that what is the last question of 40Q of TAGWA , in my life there is no answer of question “Meaning of priority 0 configured in ospf router?” .

  5. Jane woken
    February 2nd, 2017

    can somebody tell me please that what is the last question of 40Q of TAGWA , in my life there is no answer of question “Meaning of priority 0 configured in ospf router?” . Plus what it the correct answer for the following questions?
    Question 2
    Refer to the following configuration command.
    router(config)# ip nat inside source static tcp 172.16.10.8 8080 172.16.10.8 80
    Which statement about the command is true?
    A. Any packet that is received in the inside interface with a source IP port address of
    172.16.10.8:80 is translated to 172.16.10.8:8080.
    B. Any packet that is received in the inside interface with a source IP port address of
    172.16.10.8:8080 is translated to 172.16.10.8:80.
    C. The router accepts only a TCP connection from port 8080 and port 80 on IP address
    172.16.10.8.
    D. Any packet that is received in the inside interface with a source IP address of 172.16.10.8
    is redirected to port 8080 or port 80.
    Answer:?

    and

    Question 28
    A network engineer wants to ensure an optimal end-to-end delay bandwidth product. The delay is
    less than 64 KB. Which TCP feature ensures steady state throughput?
    A. Window scaling
    B. Network buffers
    C. Round-trip timers
    D. TCP acknowledgments
    Answer:?

    some people said the answer is wrong of TAGWA file. Please help

  6. Adam
    February 2nd, 2017

    @ Jane woken

    Q1: No DR/BDR is selected
    Q2: B (although my pdf says A)
    Q3: A

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    March 1st, 2017

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    March 18th, 2017

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  9. Laksh
    March 26th, 2017

    Hi All,
    I give my exam on 23rd of this month. On sims after implementing the configuration, copy running start-up command is not worked for 2 sims. I claimed same with exam instructor. But He is trying to call pearson guy to check but my exam time was on going. It was nightmare. Finally my time got over. I got 690 marks. My two sims EIGRP OSPF Redistribute and OSPF sim worked fine by testing ping n all. but unable to save it. My two SIMS almost 200 marks lost there itself with their mistake. I suppose to get 890 marks. Could you please tell anyone how to claim if there’s mistake ? and also confirm what is the marks for each sim ??

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  12. Anonymous
    April 17th, 2017

    The exam changed. The dumps as study material are okay but are only about 50-60% covered in the exam. If you only use the dumps you will not pass. Perhaps a 690-770.

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    July 19th, 2017

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  15. parker
    August 2nd, 2017

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  16. Anonymous
    August 25th, 2017

    Failed today with 760pts….although I cleared all my labs , loads of new questions ,don’t trust any dumps…study hard chaps….and loads of simlet ( IPV6 , ACL, NAT, NAT-PT ETC ETC )

    ACL very important ( IPV6 and IPV4 both)

    I was using my old 642-902 books :(, please get the new cert guide for CCNP route 300-101)

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    August 28th, 2017

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  18. learner
    October 13th, 2017

    Q 5:
    I think B and D is correct.

    B. CHAP provides a challenge to the client
    D. PAP requires a username and optional password

    Password authentication protocol (PAP) and challenge handshake authentication protocol (CHAP) are both used to authenticate PPP sessions and can be used with many VPNs. Basically, PAP works like a standard login procedure; the remote system authenticates itself using a static username and password combination. The password can be encrypted for additional security, but PAP is subject to numerous attacks. In particular, since the information is static, it is subject to password guessing as well as snooping.

    CHAP takes a more sophisticated and secure approach to authentication by creating a unique challenge phrase (a randomly generated string) for each authentication. The challenge phrase is combined with device hostnames using one-way hashing functions to authenticate in the way where no static secret information is ever transmitted over the wire. Because all transmitted information is dynamic, CHAP is significantly more robust than PAP.

  19. learner
    October 15th, 2017

    Correction, think I made a mistake…

    Q 5:
    I think B and C is correct.

    B. CHAP provides a challenge to the client
    C. PAP can be used by TACACS+ for with

  20. Switch_ROUTE
    October 22nd, 2017

    Which two debug commands can you use to view issues with CHAP and PAP authentication? (Choose two)

    A. debug tacacs
    B. debug ppp authentication
    C. debug radius
    D. debug aaa authentication
    E. debug ppp negotiation

    It should be B and E but some sites are saying that it is B and C, Anybody have any idea and can supply reference for their answer

  21. Anonymous
    November 7th, 2017

    B

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    November 9th, 2017

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