NET-08-P1 Dynamic Routing Flashcards
The purpose of these protocols is to map networks and update routing tables with the shortest routes, in a fully automatic and independent manner
Dynamic Routing
Indicates that the route was manually created by an administrator to reach a specific network
Routing Source Codes: S
indicates that the route was learned dynamically from another router
Routing Source Codes: EIGRP
Indicates that the route was learned dynamically from another router using OSPF routing protocol
Routing Source Codes: O
is a measurable value assigned by the routing protocol to different routes based on the usefulness of the route
metric
This metric will choose the path with the least amount of hops, where hops refer to the router
Routing Protocol Metrics: RIP - Routing information Protocol
This metric is based on cumulative bandwidth from source to destination and will choose the path with the highest bandwidth
Routing Protocol Metrics: OSPF - Open Shortest Path First
are routing protocols used within an autonomous system (AS), such as company routers
Protocol Types - Interior Gateway Protocols (IGP)
are used to map routes between AS’s and are mainly used by ISPs
Exterior Gateway Protocols - EGP
What is the difference between Vector vs Link-State
how the protocols discover topology and the way they share routing information with the routers
is a routing algorithm that calculates the best path for a packet based on the factors of distance and vector
Distance Vector
The distance between the router and the destination network, based on the metric of number of hops (routers)
Distance
The outgoing interface and the direction to the path that leads to the destination network
Vector
routing protocols include complete network topology maps
Link State
The map is created based on information gathered from all routers on the network
Network Map
Link state routing protocols do not broadcast information regularly. Updates are only sent when a change occurs on the network
Network Changes
is a feature used in all routing protocols. its purpose is to disable routing updates on specific interfaces which decreases resource usage and increase security
Passive Interface Feature
What is STP
Spanning Tree Protocol
What is BGP
Border Gateway Protocol
What is the parameter for Administrative Distance
AD value is 120
is a feature that allows automatic summarization of routes to their classful network. often disabled because most address schemes in networks today do not allow address summaries without compromising communication
Auto-Summarization Feature
Keeps track of changes in the topology, such as when a new network is added or when a link fails
OSPFv2
this packet is sent every 10 seconds to all OSPF-enabled routers
Hello intervals
When a router does not receive a “hello” packet from its neighbor within 40 seconds, it will consider that neighbor “dead” and will start looking for alternative routes
Dead intervals
A router uses this to advertise the routing topology to all other local routers in the same OSPFv2 areas
LSA - Link State Advertisement
stores received LSA packets, adter the routers enable OSPFv2 to use the SPF algorithm to calculate the routes
Link State Database
When an adjacency is initialized, OSPFv2 exchanges this packet to describe the content of the topological database
Database Description
If a router notices that parts of its topological database are outdated. It will send this link to a neighbor for more updated versions of those components
Link State Request
messages are responses to LSR message
Link State Update
