CCNA3 Chapter 5 Dynamic Routing

Questions and Answers

What are the purposes of dynamic routing protocols? (Select all that apply)

Choosing the best path to destination networks (correct)

Ability to find a new best path if the current path is no longer available (correct)

Maintaining up-to-date routing information (correct)

Discovery of remote networks (correct)

How can routing protocols be classified?

By purpose, operation, and behavior.

What are the classifications of IPv4 routing protocols?

RIPv1, IGRP, RIPv2, EIGRP, OSPF, IS-IS, BGP.

What are Interior Gateway Protocols (IGP)?

Routing protocols used within an Autonomous System. Signup and view all the answers

What distinguishes distance vector routing protocols?

They advertise routes based on distance and vector. Signup and view all the answers

Link-state routing protocols use periodic updates.

False Signup and view all the answers

What is the main distinction between classful and classless routing protocols?

Classful routing protocols do not send subnet mask information. Signup and view all the answers

Study Notes

Classifying Routing Protocols

Routing protocols are crucial for facilitating dynamic routing within networks.
They can be classified based on purpose, operation, and behavior.

Purpose of Dynamic Routing Protocols

Discover remote networks and maintain up-to-date routing information.
Choose the best paths to destination networks.
Adapt to changes by finding new best paths when current paths are unavailable.

Classification of Routing Protocols

By Purpose:
- Interior Gateway Protocol (IGP)
- Exterior Gateway Protocol (EGP)
By Operation:
- Distance vector protocol
- Link-state protocol
- Path-vector protocol
By Behavior:
- Classful (legacy) protocols
- Classless protocols

IPv4 Routing Protocols

Multiple protocols exist, with specific characteristics:
- RIPv1: IGP, distance vector, classful (legacy)
- IGRP: IGP, distance vector, classful (Cisco proprietary, deprecated)
- RIPv2: IGP, distance vector, classless
- EIGRP: IGP, distance vector, classless (Cisco developed)
- OSPF: IGP, link-state, classless
- IS-IS: IGP, link-state, classless
- BGP: EGP, path-vector, classless

IGP and EGP Routing Protocols

Routing within an Autonomous System (AS) is done using IGPs like RIP, EIGRP, OSPF, and IS-IS.
Routing between ASes involves EGPs; BGP is the sole operational EGP critical for Internet functionality.
Various organizations implement specific IGPs based on their size and needs, often utilizing BGP for traffic routing control.

Distance Vector Routing Protocols

Utilize two characteristics to advertise routes:
- Distance: Metric indicators (hop count, cost, bandwidth, delay).
- Vector: Direction specifying the next-hop router or exit interface.
Router has incomplete knowledge of the entire path; relies on neighboring routers as signposts.
Common IPv4 distance vector IGPs include RIPv1, RIPv2, IGRP (obsolete), and EIGRP.

Link-State Routing Protocols

Operate without periodic updates; instead, they send updates only when there is a change in topology after achieving convergence.

Classful Routing Protocols

The primary difference between classful and classless protocols is the absence of subnet mask information in updates for classful routing protocols.

Description

Test your knowledge of dynamic routing protocols with these flashcards from CCNA3 Chapter 5. Explore terms, definitions, and the classification of routing protocols to ensure you understand the essentials of network routing.