Lesson 4 - Terms

Question 1

What is an ISP

Answer 1

Internet Service Provider

Question 2

What is an IXP

Answer 2

Internet Exchange Point, physical infrastructure that provides the means for ASes to interconnect and directly exchange traffic with one another

Question 3

What is a CDN

Answer 3

Content Delivery Network

Question 4

What is a POP

Answer 4

Point of Presence, one or more routers in a provider’s network which can be used by a customer network to connect to that provider

Question 5

What is an AS

Answer 5

Autonomous System, group of routers under a single administrative authority

Question 6

What is an IGP

Answer 6

Internet Gateway Protocol

Question 7

What is a BGP

Answer 7

Border Gateway Protocol

Question 8

What is a provider relationship

Answer 8

Finance settlement which determines what customers will pay, influencing a relationship

Question 9

What is a peering relationship

Answer 9

To ASes share access to a subset of each other’s routing tables, which is restricted to respective customers

Question 10

What is a BGP session

Answer 10

BGP peers, over a semi-permanent TCP, exchange routing information

Question 11

What is an eBGP

Answer 11

External BDP sessions

Question 12

What is an iBGP

Answer 12

Internal BGP sessions

Question 13

What is a localpref

Answer 13

Attribute used to prefer routes learned through a specific AS over other ASes

Question 14

What is a MED attribute

Answer 14

Multi-Exit Discriminator, used by ASes connected by multiple links to designate which of those links are preferred for inbound traffic

Question 15

What is flap damping

Answer 15

Suppressing the route based on tracking updates to a specific prefix over a certain period of time

Question 16

What is a Route Server

Answer 16

Connects and shares routing information from its peers or participants, executes its own BGP decision process and re-advertises resulting information