2.1 Routing Technologies

Question 1

Dynamic Routing

Border Gateway Protocol (BGP)

Answer 1

Between companies (internet)
Best path between networks
path vector protocol

Question 2

Dynamic Routing

Enhanced Interior Gateway Routing Protocol (EIGRP)

Answer 2

Cistco Proprietary
Used inside a company’s private network
fast and efficient
Support unequal cost load balancing

Question 3

Dynamic routing

Open Shortest Path First (OSPF)

Answer 3

Standard Protocol
Inside Company
Link-state protocol(shares full map of network with other routers)
calculates shortest path using dikstra’s algorithm

Question 4

What is NAT?

Answer 4

Network Address Translation

Translate Private IP address into public IP address when going to the in

Question 5

What is PAT

Answer 5

Port Address Translation
NAT but smarter

Uses one public IP address but tracks traffic using port numbers

Question 6

Prefix Lengths

Answer 6

Most specific route ‘wins’
Combination of subnet ID and prefix length

Pick route to address 192.168.1.6
192.168.0.0/16
192.168.1.6/32

Question 7

Administrative distance

Answer 7

Used by router to determine which routing protocol has priority

Question 8

First Hop Redundancy Protocol(FHRP)

Answer 8

Family of Protocols that makes VIP failover happen automatically. Routers talk amoung themselves, elect and active device and standby backup devices.

Question 9

Virtual IP (VIP)

Answer 9

Virtual IP that is not tied to a single physical device. If a active device fails, another device takes over VIP

Question 10

Sub interfaces

Answer 10

Virtual interfaces created inside a single physical network interface

Question 11

Metric

Answer 11

Determine Best path within a single routing protocol