Routing Fundamentals Flashcards
What is a router
L3 device
Breaks up broadcast domain
Use to connect diff networks
Use to communicate from our internal to external network
Uses routing protocols
Routing categories
Static
Dynamic
What is static routing
Simplest form of routing
Static routes that are manually entered by net admin
Use in small networks with very few routes that rarely change
Problem with static routing
Problematic for large networks if networks regularly changes
Time consuiming and prone to error since you have to manually type in
What is dynamic routing
Automated form of routing that uses routing protocol to:
Populate routing tables
Make the most efficient routing decisions
Update the routing table whenever the network changes
Automatic and hands off-all routing decisions are handled by the protocol
Used in large networks
Types of Dynamic routing
Distance vector
Link state
Hybrid
What is distance vector
What is link state
What is hybrid routing
What is AS (autonomous system)
Independent Entity or Organization
Group of networks that is controlled by a single administrative entity
Type of IGP
RIP
EIGRP
OSPF
Type of EGP
BGP
What routing protocol uses distance vector
RIP
EIGRP
What routing protocol uses link state
BGP
How does IGP work
Used internally within our single AS (organization)
Not intended to route between autonomous systems, we use egp for that
How does EGP work
Use to route between AS or from 1 org to another
Used by ISPs
Ex: if we want to route traffic between udemy to facebook, ISP will utilize BGP
What is distance vector
Uses distance as its metric for making routing decisions
Distance = hop count
Pc1 to router 1 = 1 hop, router 1 to router 2 = 2 hop etc
Hops are the number of routers it has to pass through from source to destination
What is link state
Builds a map of entire network
Utilizes LSAs (link state sdvertisements) to accomplish routers share information w all other routers on the network
Routers only update each other when there is a change in the network
What protocol uses link state
OSPF
What is ospf
What is bgp
Border gateway protocol
Used by large networks
Used by ISPs
Very scalable since it uses hundreds of thousands even millions of routes
What is igp
Interior gateway protocol
Used for exchanging routing information between gateways
What is egp
Provides connection between different AS
