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PPP Questions

November 27th, 2017 Go to comments

Question 1

Question 2

Question 3


Both routers must use the same password for CHAP to authentication.

Question 4


Point-to-point leased line is the most expensive interconnection between two ends as the line is dedicated to a single user, the user should still pay for all available bandwidth, including those unused. -> A is not correct.

With the cost of point-to-point leased line, the full-mesh capability is only achieved when your company has very very strong budget to pay all the bills. To create a full-mesh topology for n sites, we need n*(n-1)/2 leased line connections. For example if we have 6 sites then we need 6*5/2 = 15 leased line connections -> It is nearly impossible for a normal company to achieve full-mesh topology -> B is not correct.

Flexibility is not an advantage of leased line connection -> C is not correct.

Point-to-point leased line simplifies the configuration as the circuit is available on a permanent basis and does not require a connection to be set up before traffic is passed. It does not require to define a permanent virtual circuit (PVC) in the configuration either -> D is correct.

Question 5


Suppose R1 has two Serial interfaces which are directly connected to R2. This is how to configure multilink on R1:

R1(config-if)# interface Serial 0/0
R1(config-if)# encapsulation ppp
R1(config-if)# ppp multilink
R1(config-if)# ppp multilink group 1
R1(config-if)# no shutdown

R1(config-if)# interface Serial 0/1
R1(config-if)# encapsulation ppp
R1(config-if)# ppp multilink
R1(config-if)# ppp multilink group 1
R1(config-if)# no shutdown

R1(config)# interface multilink 1
R1(config-if)# ip address
R1(config-if)# ppp multilink
R1(config-if)# ppp multilink group 1

Therefore we must configure IP address under multilink interface, not physical member interfaces.

Question 6


The Multilink PPP feature provides load balancing functionality over multiple WAN links while providing multivendor interoperability and support for packet fragmentation, proper sequencing, and load calculation on both inbound and outbound traffic.

Multilink PPP combines multiple physical links into a logical bundle called a Multilink PPP bundle. A Multilink PPP bundle is a single, virtual interface that connects to the peer system. Having a single interface (Multilink PPP bundle interface) provides a single point to apply hierarchical queueing, shaping, and policing to traffic flows. Individual links in a bundle do not perform any hierarchical queueing. None of the links have any knowledge about the traffic on parallel links.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/wan_mlp/configuration/xe-3s/wan-mlp-xe-3s-book/wan_cfg_mlppp_conn_xe.html

MLPPP supports two authentication protocols: Password Authentication protocol (PAP) and Challenge-Handshake Authentication Protocol (CHAP)

Question 7

Question 8


The command “ppp authentication chap pap” command indicates the CHAP authentication is used first. If it fails or is rejected by other side then uses PAP instead. If you want to use PAP first (then CHAP) you can use the “ppp authentication pap chap” command.

Comments (19) Comments
  1. Waqar
    February 27th, 2017

    Why there is a question mark against C in the answer of question 4???

  2. Anonymous
    March 2nd, 2017

    Regarding Q2, why is the ppp-variant of the encapsulation correct? I would say that when you configure nothing but the ip address, IOS will default to a default encapsulation of HDLC for serial links. In any case, there seems to be no reference of the remote router’s used encapsulation method?
    Or,…could it be that whenever IOS default to using the HDLC encapsulation, it also uses the Cisco-proprietary version of it, hence making this an inappropriate encapsulation method to use with non-Cisco routers?

  3. shahanga
    March 10th, 2017

    when no encapsulation is specified then cisco routers run HDLC encapsulation by default, but since the remote site is not cisco router then encapsulation should be specified for the link to work

  4. venkat
    April 12th, 2017

    Where can i find the questions to these?

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    April 17th, 2017

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  7. Albert
    July 8th, 2017

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  8. Lisa.sweetheart.ccna@gmail.com
    July 10th, 2017



  9. uspallata
    July 21st, 2017

    answers to question 3 of the quiz on-line is wrong. Why is that answers differ from one link and the other

  10. sowe
    July 21st, 2017

    please share the questions im not able so see it

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    August 3rd, 2017

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  12. rafael
    August 14th, 2017


    Is the question 3 correct ? It doesn’t even send the username and password for authentication, the username on the routers are different. How “The passwords do not match on the two routers” can be the correct answer ?

  13. Sam
    August 27th, 2017

    Hi @ rafeal

    To configure CHAP, Below are a must:
    1. username of Router is the “hostname” of the peer Router.
    2. password is identical for both Routers

    More details here :

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    October 17th, 2017

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    January 30th, 2018

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    February 12th, 2018

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    February 12th, 2018

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