Network+ 2.1 Routing

Routing table

A data structure that stores routes to various network destinations on a router

Routing Source

The origin from which the router learns about routes designated with a Letter

Destination Network

The network address where data is being sent.

Metric

A value that determines the best path to a destination.

Administrative Distance

A value that indicates the trustworthiness of a routing source.

Exit port or next hop IP address

The next step or address to which data is forwarded.

Static Routing

Routing that is manually configured and does not change unless manually altered.

Dynamic Routing

Routing that automatically updates based on network changes.

IGP

Type of routing protocol used within an autonomous system

RIP

Dynamic routing protocol. type=distance vector, metric=hop count, AD=120.

OSPF

Dynamic routing protocol. type=link state, metric=cost, AD=110.

EIGRP

Dynamic routing protocol. type=hybrid, metric=bandwidth, delay, load, reliability, AD=90.

EGP

Type of routing protocol used between autonomous systems.

BGP

The only example of an exterior gateway protocol

NAT

The process of translating private IP addresses to public IP addresses.

PAT

Allows multiple private IP addresses to map to a single public IP address using port numbers.

Autonomous System (AS)

Interconnected networks under a single administrative control.

Lower

metric value indicates what is better route

Trustworthiness score for routing sources

Administrative Distance

NAT addressing inside network

Private IP address used within a local network.

NAT addressing outside network

Public IP address used for internet communication.

Administrative distance for RIP

120

Administrative distance for static routes

1

Administrative distance for OSPF

110

Administrative distance for EIGRP

90

Route source for a network configured on this router

C

Route source for a route that was manually configured

S

Route source for a route discovered using a distance vector routing protocol

R

RIP--router shares information with who?

Neighbors

OSPF--router shares information with who?

Everyone

RIP--router updates how often?

Every 30 seconds

OSPF--router updates how often?

Only when network changes

Metric for RIP

hop count

Metric for OSPF

bandwidth

Metric for EIGRP

bandwidth, delay, reliability