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23 Cards in this Set

  • Front
  • Back
- What is an IP prefix?
- It refers to the IP subnets assigned to networks by the official governing body that manages IP addresses.
- Full feed refers to what?
- To all internet prefixes
- What is a BGP feed?
- BGP session that provides reach ability information of IP prefixes on the Internet
- Router ID (RID)?
- It’s the highest loopback IP address
- Exit point
- This is a router that connects two autonomous systems; traffic comes in and goes of the internet through the exit point.
- EBGP is primarily used in two different environments
- Between ISP’s and their customers
- Between different ISP’s
- What is an Internet exchange point?
- It's where all the big ISPs exchange BGP routes with each other.
- Name 3 types of BGP peering agreements
- Transit; If B is configured so that it will pass all internet traffic from A, B is a transit provider of A.
- Public; An EBGP session at IXP
- Private; An EBGP session on a private link between two autonomous systems is called private peering.
- What transport mechanism does BGP relies on to establish its connection and to exchange information between BGP peers?
- TCP port 179
- What is the requirement needed before any information can be exchanged between BGP speakers
- A neighbor relationship
- What does BGP use to ensure availability of BGP neighbors?
- Keep alive messages
- What are the 6 stages of neighbor relationship?
- Idle;
- Connect; BGP waits for a TCP connection to be completed
- Active; TCP connection is initiated
- Open Sent;
- Open Confirm;
- Establish;
- 2 types of configurations when peering with EBGP
- Peering with a physical interface
- Peering with each others loopback Interface
- Loopback addresses are used because.....
- They are virtual interfaces and they never go down like physical interfaces do
- Three ways to advertise the prefix
- Using the network statement
- Using the redistribute command
- Using the aggregate statement
- What are BGP policies?
- They influence how traffic flow coming in or going out of the network
- What is an IP prefix?
- Refers to the IP subnet assigned to networks by the official governing body that manages IP address.
- What is a Hot Potato?
- BGP policy that governs that traffic will exit the AS from the closest exit-point router
- What is a Cold Potato?
- BGP policy that governs that traffic will be delivered through the path that is closest to the destination.
- What does BGP use to ensure availability of BGP neighbors?
- Keepalives
- What is the holdtime value for keepalives?
- 90 seconds
- What are the 2 ways to configure peering EBGP?
- Peering with the physical interface
- Peering with each other’s loopback interfaces (with static routes used to reach the other loopback address)
- Why do we use loopback addresses?
- Because they are virtual interfaces, they never go down like physical interfaces do.
- Even if one physical interface goes down, BGP between loopback remains up as long as they exist as redundant paths to each other’s loopbacks.