computer networking- routers
What is a routing table
A set of rules that is used to determine where data packets traveling over an IP network will be detected
What is static routing
When the network admin sets routing tables manually
What are a routers 2 functions
-to deliver a packet to a host that is on one of their connected networks - create routing tables by sharing information with other routers ( this is how they gather info about networks they are not connected to)
What do routers communicate with each other about
-what networks they handle -what other routers they know about - what are the fastest paths
What are the 3 goals of a router
1) have a system for rating a path 2) create a routing table that keeps track of other routers and the networks they handle 3)convergence - have completely updated routing table information after changes occur
What are three ways entries can Happen
1) static- administrator types them in 2) automatic- the connected networks are included by default 3) dynamic- a routing protocol gives info about a remote network
What are hybrid protocols
A mixture of link state and distance vector
What is the hybrid protocols
Eigrp- only works on Cisco
Hop count
How many routers will it hit on the way to the destination
What are the link state routing protocols
Is-is Ospf
What does hybrid do instead of hop count
It looks at bandwidth and how much delay is on a connection
Why is Ospf used most
It's very common and very fast- it opens the shortest path first
Administrative distance rating
Low is good high is bad (it means you closer to the network when it's low)
What does distance vector do
Makes decisions based on how far in which direction
out of RIP, RIPv2, BGP, OSPF which protocol would provide a more flexible means of determining the route used and produce less broadcast traffic
OSPF
if you have a small network and you must configure routing, you decide to use a distance vector protocol, which protocol would you use
RIPv2
Does igp, Bgp, rip, Isis use next hop metric in deciding how to route traffic
Rip uses next hop metric
What are the distance vector protocols
Rip- uses hop count Ripv2- uses hop count is faster than rip Bgp- routes only between autonomous systems I.e. Stand alon networks
What does link state do
Sends out lsa to tell where it is, what is connected, how fast it is .... Routers use lsa I for to build a map of routes
What is the Best rating in a routing table
The lowest administrative distance
what is routing convergence time
Time required by switch ports to update their link status and transition to the forwarding state
what metrics does eirgp use
bandwidth
what is autonomous system
collection of connected IP routing protocols under the control of one or more network operators on behalf of a single administrative entity that presents a common, clearly defined routing policy to the Internet.
packets aer sent to a tc/ip address that can't be located on the lan. However the packets still arrive at their correct destination. what would route these packets towards their destination
default gateway
what metric does rip, and ripv2 use
hop count
which metric is used by RIP version 2 protocol to determine the network path
hop count
what is a disadvantage to routing
it is unresponsive to change
static routing
manually typed in
dynamic routing
when routers talk to other routers and find out what networks they are attached to