6.3 Dynamic Routing

Question 1

What are the three components of Dynamic routing protocols

Answer 1

Data structures
Routing protocol messages
Algorithms

Question 2

What do you call a organization with an assigned network address from an ISP

Answer 2

autonomous system

Question 3

Describe a Internal routing protocol or a interior Gateway Protocol (IGPS)

Answer 3

used to send information between devices within an organization’s routing domain.

Question 4

Describe an external routing protocol or an External Gateway protocol (EGP)

Answer 4

used by ISPs to send packets across the internet from one network to another.

Question 5

What are some of the Interior Gateway Protocols

Answer 5

Routing Information Protocol (RIP)
Open Shortest Path First (OSPF)
Interior Gateway Routing Protocol (IGRP)
Intermediate System-to-Intermediate System (IS-IS)
Enhanced IGRP (EIGRP)

Question 6

What is one of the Exterior Gateway Protocols

Answer 6

Border Gateway Protocol (BGP

Question 7

Describe equal cost load balancing

Answer 7

In the event a router has more than one path to the same destination with the same cost metric, the router will forward the packets using both paths.

Question 8

Describe the protocol Routing Information Protocol (RIP) metric

Answer 8

considers hop count. Hop count is determined by the number of routers along a path. Each router equals one hop count. No more than 15 hop counts are permitted for a route.

Question 9

Describe the Open shortest path first metric

Answer 9

considers the cost. Cost is determined by the total bandwidth available from origination to destination. Better bandwidth gets a lower cost. Slower bandwidth gets a higher cost.

Question 10

Describe the Enhanced Interior gateway Routing Protocol metric

Answer 10

uses a metric that considers the slowest bandwidth, dependability of a path, load, and delay values.

Question 11

What are the three primary algorithms used to determine the best path

Answer 11

Distance vector
Link state
Path vector

Question 12

What is Distance Vector Routing?

Answer 12

routing protocol in data networks determines the best route for data packets based on distance

Question 13

What are the principles of the distance vector method

Answer 13

Routers send updates only to their neighbor routers.
Routers send their entire routing table.
Tables are sent at regular intervals. Each router is configured to specify its own update interval.
Routers modify their tables based on information received from their neighbors.

Question 14

Describe a routing loop/ count-to-infinity condition

Answer 14

when two routers have different information in the routing table.

Question 15

Define the Link-State Routing Protocols

Answer 15

maintains an entire map of your network , very demanding on ram and cpu and is more complex

Question 16

Name some of the advantages of Link-state Routing

Answer 16

Less convergence time (because updates are forwarded immediately)
Not susceptible to routing loops
Less susceptible to erroneous information (because only firsthand information is broadcast)
Negligible bandwidth requirements for a typical LAN environment

Question 17

Name some of the disadvantages of Link-state Routing

Answer 17

Because the algorithm re-creates the exact topology of the network for route computation, the link-state algorithm requires greater CPU and memory capability to calculate the network topology and select the route.
It generates a high amount of traffic when LSPs are initially flooded through the network or when the topology changes. However, after the initial configuration occurs, the traffic from the link-state method is smaller than that from the distance vector method.
It is possible for LSPs to get delayed or lost, resulting in an inconsistent view of the network. This is particularly a problem for larger networks and is also a problem if parts of the network come online at different times or if the bandwidth between links varies. For example, LSPs travel faster through some parts of the network than through others.

Question 18

What is EIGRP Enhanced Interior Gateway Routing Protocol ?

Answer 18

an advanced distance-vector routing protocol that is used on a computer network for automating routing decisions and configuration.

Question 19

How does EIGRP work?

Answer 19

used on a router to share routes with other routers within the same autonomous system. Unlike other well known routing protocols, such as RIP, EIGRP only sends incremental updates, reducing the workload on the router and the amount of data that needs to be transmitted.

Question 20

Describe How OSPF works

Answer 20

Determines the shortest path to a given device by bandwith between the devices

Question 21

Explain how RIP works

Answer 21

Dertermines the quickest route to a device by the number of hops needed to get to the device