BGP Fundamentals

  1. What protocols are used to connect AS's in the internet today?



    A. - BGP
  2. What are the two ways of instructing a router to exchange prefixes?






    A. - Redistribute and Network Statements
  3. Why aren't IGP's used to connect Autonomous Systems? (Multiple answers may apply)

    A.- IGP's do not scale very well
    B.- Routers will constantly update each other when a link goes down when using IGP routing
    C.- Routers will share all network information with other ISP's if connected through an IGP
    D.- IGP's are slow to converge
    E.- All of the above
    • A.- IGP's do not scale very well
    • B.- Routers will constantly update each other when a link goes down when using IGP routing
    • C.- Routers will share all network information with other ISP's if connected through an IGP
  4. The Notification message exchanges routing information



    B. - False
  5. If there is no error condition present, the peer state will travel through the "Active" state



    C. - False
  6. The number of IPv4 routing entries in the internet is now around



    C. - 300,000
  7. BGP stands for:



    A. - Border Gateway Protocol
  8. What type of message is sent in the "Connect" state



    A. - OPEN message
  9. Match Port Flapping with its definition



    A. - The state of the port goes up and down multiple times
  10. Which of these are states in the BGP peering process? (Multiple answers may apply)

    A.- Connect
    B.- Active
    C.- OpenReceived
    D.- OpenSent
    E.- Lazy
    F.- Ready
    • A.- Connect
    • B.- Active
    • D.- OpenSent
  11. BGP can be described as a very _________ protocol.



    B. - Selective
  12. BGP uses what process to establish peers?




    C. - Finite State Machine
  13. Which of these attributes prefer a higher value? (Multiple answers may apply)





    • C. - Local_Preference
    • D.- Weight
  14. Private IP prefixes should be advertised by BGP routers into the internet.



    A. - False
  15. KEEPALIVE messages are sent between which two states?





    • D. - ESTABLISHED
    • D.- OPENCONFIRM
  16. OPEN messages are sent from which two states?

    A.- ACTIVE
    B.- OPENSENT
    C.- OPENRECEIVED
    D.- OPENCONFIRM
    E.- CONNECT
    • A.- ACTIVE
    • B.- OPENSENT
  17. What might be the error conditions for not progressing to the OPENCONFIRM state?

    A.- If no OPEN message is received back
    B.- If the BGP versions do not match
    C.- AS mis-configured
    D.- If the timer expires before receiving a return KEEPALIVE message
    E.- All of the above
    • A.- If no OPEN message is received back
    • B.- If the BGP versions do not match
    • C.- AS mis-configured
  18. Adding BGP using Network Statement will ________ prefix sharing



    B. - Permit
  19. Which of the below protocols are IGP's (Multiple answers may apply)







    • A. - ISIS
    • D.- OSPF
  20. What port does BGP use to communicate with peers?





    A. - TCP 179
  21. BGP spends a long time in the "Connect" state.



    A. - False
  22. By default BGP peers require direct IP connection.



    A. - TRUE
  23. BGP routers will exchange prefix information with peers without being configured to do so.



    B. - FALSE
  24. If the CONNECT state experiences a problem it moves to which state:





    D. - ACTIVE
  25. What are the possible error reasons that might occur when peering is trying to reach the "Connect" state? (Multiple answers may apply)

    A.- AS number is configured
    B.- Wrong configuration of neighbor address
    C.- Particular TCP port number blocked
    D.- Inbound BGP connection attempts are being refused
    E.- Particular UDP port number blocked.
    • B.- Wrong configuration of neighbor address
    • C.- Particular TCP port number blocked
  26. What are the main reasons why it is recommended to summarize prefixes advertised by a BGP router? (Multiple answers may apply)






    F. - All of the above
  27. What type of protocol does IGP is?



    B. - Distance Vector Protocol
  28. What type of protocol does BGP is?



    B. - Path Vector Protocol
  29. What type of protocol does RIP is?



    C. - Link State Protocol
  30. What is the definition of IP Address?



    C. - Used to identify and locate a device in an IP network
  31. What is the definition of IP Prefix?



    C. - Used to identify a network
  32. What is the definition of IPv4?



    C. - Protocol used to define addressing
Author
piwi2024
ID
178644
Card Set
BGP Fundamentals
Description
BGP Fundamentals
Updated