1.3 Understanding Host-to-Host Communication Model

Understanding Host-to-Host Communications Model © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0²1-1 Why a Layered Network Model? Reduces complexity Standardizes interfaces Facilitates modular engineering Ensures interoperable technology Accelerates evolution Simplifies teaching and learning © 2007 Cisco Systems, Inc.

1.2 CCNA - Intro to Networking

What is a Network?

A network is an interconnection of computers and network devices for the purpose of information interchange and resource sharing.

1. CCNA-Course-Overview

COURSE GOAL:

1. To provide you with the knowledge and skills necessary to install, operate, and troubleshoot a small network.

2.1 CCNA - Intro-to-Routing

Intro-to-Routing

Routing Protocols and Concepts:

•Describe the basic purpose of a router
–Computers that specialize in sending packets over the data network.
–They are responsible for interconnecting networks by selecting the best path for a packet to travel and forwarding packets to their destination
•Routers have many of the same hardware and software components that are found in other computers including:
–CPU
–RAM
–ROM
–Operating System

2.3 CCNA BOOTCAMP - OSPF

OSPF

Hello Packet Purposes:

1. Discover OSPF neighbors and establish adjacencies.
2. Advertise guidelines on which Routers must agree to become neighbors.
3. Use by multi-access networks to elect a designated router and a back-up designated router.