Routing Chapter 7

Question 1

What is Port Address Translation (PAT)?

Answer 1

Share single public IP address with a group of computers on a internal network using ports

Question 2

What is Network Address Translation (NAT)?

Answer 2

Means of translating a systems IP address into another address before sending it out to another larger network

Question 3

What is an Exterior Gateway Protocol (EGP)?

Answer 3

Outdated way of connection autonomous systems to the internet, replaced by Border Gateway Protocol (BGP)

Question 4

What is Border Gateway Protocol (BGP)?

Answer 4

Enables groups of routers to share routing information so that efficient loop free route can be established. This a Hybrid protocol, primarily exterior but can be used internally

Distance Vector

Question 5

What is Open Shortest Path First (OSPF)?

Answer 5

Interior gateway routing protocol developed for ip networks based on the shortest past first, or link state algorithm. Corrects link failures and creates convergence. Most common protocol of choice for large networks

Link State

V2 Ipv4
V3 Ipv6

Question 6

What are areas in OSPF?

Answer 6

Administrative groupings of interconnected routers to help control how routers reroute traffic if a link drops

Question 7

What is the backbone area?

Answer 7

All traffic between Areas has to go through the back bone, central area and it gets assigned Area ID of Zero 0.0.0.0

Question 8

Which Cables are used to configure a router?

Answer 8

Yost Cable
Roll Over Cable
Console Cable

For Cisco Devices

Question 9

What is Enhanced Interior Gateway Routing Protocol (EIGRP)?

Answer 9

Cisco version of EGP, Hybrid using both Distance Vector and Link state Protocol

Question 10

What is Routing Information Protocol (RIP)?

Answer 10

Outdated Routing protocol with several short comings

Distance Vector

Question 11

What is a distance vector?

Answer 11

Set of routing protocols that calculates total costs to get to a specific network id and compares that cost to the total cost of all the other routes to get to that same network id.

Question 12

What are some routing protocols used for interior networks?

Answer 12

RIP Routing Information Protocol
OSPF Open Shortest Path First
IS-IS Intermediate System to Intermediate System
EIGRP Enhanced Interiror Gateway Routing Protocol

Question 13

What is Intermediate System to Intermediate System (IS-IS)?

Answer 13

A link state dynamic routing protocol similar to but not as popular as OSPF. Support for Ipv6 and is defacto standard for ISPs

Link State

Question 14

What is the best way to connect to a router for configuration/modification?

Answer 14

Typically you would SSH into the router over a network but if that is unavailable, directly connecting to the network using a rollover cable/ console cable

Question 15

What is link state?

Answer 15

Type of dynamic routing protocol that announces only changes to routing tables.

add context later

Question 16

What is difference between Distance Vector and Link State

Answer 16

Distance Vector is always mapping the whole network where as Link Sate only maps network when something changes.

Question 17

What is a Routing Table?

Answer 17

Lists of various networks and the next hop to reach them. Routers direct traffic for each network to the next hop. Table can be built manually or automatically.

Question 18

What is Convergence?

Answer 18

Point at which the routing tables for all routers in a network are updated.