BGP Fundamentals

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

A. - EGP
B. - BGP
C. - ISIS

What are the two ways of instructing a router to exchange prefixes?

A. - Distribute
B. - Redistribute
C. - Redistribute and Network Statements
D. - Contribute
E. - Prefix Statements
F. - Network Statements

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

The Notification message exchanges routing information

A. - None
B. - False
C. - True

If there is no error condition present, the peer state will travel through the "Active" state

A. - True
B. - None
C. - False

The number of IPv4 routing entries in the internet is now around

A. - two billion
B. - 300,000
C. - 100,000

BGP stands for:

A. - Basic Gateway Protocol
B. - Broadband Gateway Protocol
C. - Border Gateway Protocol

What type of message is sent in the "Connect" state

A. - OPEN message
B. - Update
C. - KEEPALIVE message

Match Port Flapping with its definition

A. - The port is administratively shut down
B. - The state of the port goes up and down multiple times
C. - The port is being re-configured

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

BGP can be described as a very _________ protocol.

A. - Selective
B. - Fast Converging
C. - Chatty

BGP uses what process to establish peers?

A. - Definite State Machine
B. - Finite Estate Machine
C. - Finite State Machine
D. - Definite Estate Machine

Which of these attributes prefer a higher value? (Multiple answers may apply)

A. - Number of AS-Paths
B. - Router ID
C. - MED
D. - Local_Preference
E. - Weight

Private IP prefixes should be advertised by BGP routers into the internet.

A. - None
B. - False
C. - True

KEEPALIVE messages are sent between which two states?

A. - CONNECT
B. - OPENSENT
C. - OPENCONFIRM
D. - LAZY
E. - ESTABLISHED

OPEN messages are sent from which two states?

A.- ACTIVE
B.- OPENSENT
C.- OPENRECEIVED
D.- OPENCONFIRM
E.- CONNECT

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

Adding BGP using Network Statement will ________ prefix sharing

A. - Deny
B. - Filter
C. - Permit

Which of the below protocols are IGP's (Multiple answers may apply)

A. - ISIS
B. - OSOS
C. - ISPF
D. - OSPF
E. - IPv4
F. - BGP
G. - None of the above

What port does BGP use to communicate with peers?

A. - UDP 279
B. - TCP 279
C. - TCP 79
D. - UDP 179
E. - TCP 179

BGP spends a long time in the "Connect" state.

A. - True
B. - False
C. - None

By default BGP peers require direct IP connection.

A. - FALSE
B. - TRUE
C. - None

BGP routers will exchange prefix information with peers without being configured to do so.

A. - FALSE
B. - None
C. - TRUE

If the CONNECT state experiences a problem it moves to which state:

A. - READY
B. - ACTIVE
C. - IDLE
D. - OPENSENT
E. - OPENCONFIRM

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.

What are the main reasons why it is recommended to summarize prefixes advertised by a BGP router? (Multiple answers may apply)

A. - To reduce the amount of Internet routing table entries
B. - To reduce the time it takes for BGP to converge
C. - To stabilize Internet routing tables
D. - To reduce processing on BGP routers globally
E. - To remove the impact of port flapping
F. - All of the above

What type of protocol does IGP is?

A. - Distance Vector Protocol
B. - Link State Protocol
C. - Path Vector Protocol

What type of protocol does BGP is?

A. - Link State Protocol
B. - Distance Vector Protocol
C. - Path Vector Protocol

What type of protocol does RIP is?

A. - Path Vector Protocol
B. - Distance Vector Protocol
C. - Link State Protocol

What is the definition of IP Address?

A. - Used to identify and locate a device in an IP network
B. - Used to identify a network
C. - Protocol used to define addressing

What is the definition of IP Prefix?

A. - Used to identify and locate a device in an IP network
B. - Used to identify a network
C. - Protocol used to define addressing

What is the definition of IPv4?

A. - Protocol used to define addressing
B. - Used to identify a network
C. - Used to identify and locate a device in an IP network