12. Advanced BGP Flashcards
What is BGP Multi-Homing?
Adding a second circuit and establishing a second BGP session on this link
What is BGPs default behaviour in routing?
To only provide the best path in the RIB
What is the risk of connecting with multiple service providers?
That the AS becomes a transit AS
How can transit routing be avoided?
By applying outbound policies for local BGP routes
When is the traffic flow symmetric?
When the same path is taken in both directions
When is the traffic flow asymmetric?
When different paths are taken for each direction
When is a patu considered deterministic?
When it is predetermined and predictable
What does the command permit ip 10.0.0.0 0.0.0.0 255.255.0.0 0.0.0.0 mean?
Permits only the 10.0.0.0/16 network
What does the command permit ip 10.0.0.0 0.0.255.0 255.255.255.0 0.0.0.0 mean?
Permits only the 10.0.x.0/24 network
What does the command permit ip 172.16.0.0 0.0.255.255 255.255.255.0 0.0.0.255 mean?
Permits the 172.16.0.0/24-32 network
What does the command permit ip 172.16.0.0 0.0.255.255 255.255.255.128 0.0.0.127 mean?
Permits the 172.16.0.0/25-32 network
What is prefix matching?
Identifies a specific IP address, network or network range and allows for the selection of multiple networks with a variety of prefix lengths by using a prefix match specification
What are the two parts of a prefix match specification?
- High-order bit pattern (left)
- High-order bit count (right)
What is the command for a prefix-list?
ip prefix-list name (seq) permit/deny Highpattern/Highbitcount ge/le
What happens if you do not provide a sequence number in the prefix-list?
It increments with 5 automatically
