O'Reilly logo

CCIE Security Exam Quick Reference Sheets by Lancy Lobo, Umesh Lakshman

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 1. General Networking

Networking Basics

The International Organization for Standardization (ISO) developed the Open Systems Interconnection (OSI) model to enable delineation of various functions performed by devices in the network as well as the applications. The OSI model consists of seven layers. Figure 1-1 outlines the OSI model and functions of each layer.

FIGURE 1-1 The OSI model

image

Connection-oriented protocols provide guaranteed delivery of datagrams between devices in a network. Connectionless protocols provide best-effort services during the transmission of datagrams between network devices.

Peer-to-peer connectivity in a network ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required