A host can also be defined as any device assigned a network address.
Network Architectures A host refers to any device that is connected to a network. Common uses of a VPN are to connect branch offices or remote users to a main office. A VPN (Virtual Private Network) allows for information to be securely sent across a public or unsecure network, such as the Internet. A SAN (Storage Area Network) provides systems with high-speed, lossless access to high-capacity storage devices. Some networks are categorized by their function, as opposed to their size. The Internet is the largest and most well-known internetwork. An internetwork is a general term describing multiple networks connected together. A MAN is defined as a network that connects LAN’s across a city-wide geographic area. A MAN (Metropolitan Area Network) is another category of network, though the term is not prevalently used. A WAN is often under the administrative control of several organizations (or providers), and does not necessarily need to span large geographical distances. A more practical definition of a WAN is a network that traverses a public or commercial carrier, using one of several WAN technologies. This is a general definition, and not always accurate. The book definition of a WAN is a network that spans large geographical locations, usually to connect multiple LANs. Ethernet is the most common LAN technology. A LAN is usually under the administrative control of a single organization. WANs (Wide Area Networks) A LAN is generally a high-speed network that covers a small geographic area, usually contained within a single building or campus.The two most common categories of networks are: Both are covered in great detail in another guide.īasic Network Types Network types are often defined by function or size. The Open Systems Interconnect (OSI) and Department of Defense (DoD) models are the most widely recognized reference models. A network reference model serves as a blueprint, detailing standards for how protocol communication should occur. Network reference models were developed to allow products from different manufacturers to interoperate on a network. Protocols are covered in great detail in other guides. SMTP – Simple Mail Transfer Protocol Multiple protocols often work together to facilitate end-to-end network communication, forming protocol suites or stacks.Telephony and videoconferencing Protocols are rules that govern how devices communicate and share information across a network.A computer network connects two or more devices together to share a nearly limitless range of information and services, including: The term network is used in a variety of contexts, including telephone, television, computer, or even people networks. Section 1 - Introduction to Networks What is a Network? Α network is simply defined as something that connects things together for a specific purpose. Part V - WANs Section 24 Section 25 Section 26 Section 27 Part IV – VLANs, Access-Lists, and Services Section 21 Section 22 Section 23 Classless Routing Configuring Static Routes RIPv1 & RIPv2 IGRP EIGRP OSPF Part III - Routing Section 13 Section 14 Section 15 Section 16 Section 17 Section 18 Section 19 Section 20 Router Components Introduction to the Cisco IOS Advanced IOS Functions Part II – The Cisco IOS Section 10 Section 11 Section 12 Routers STP IPv4 Addressing and Subnetting TCP and UDP IPv6 Addressing Introduction to 802.11 Wireless Introduction to Networking OSI Reference Model Ethernet Technologies Hubs vs. Table of Contents Part I – General Networking Concepts Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 9 This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. All other material copyright © of their respective owners. *** All original material copyright © 2013 by Aaron Balchunas ( ), unless otherwise noted. I sincerely hope that this document provides some assistance and clarity in your studies. Nor can this document be sold or published without my expressed consent. However, the contents of this document cannot be altered, without my written consent. This document is freely given, and can be freely distributed. This is not a comprehensive document containing all the secrets of the CCNA, nor is it a “braindump” of questions and answers. _ Foreword: This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. Cisco CCNA Study Guide v2.62 © 2012 _ Aaron Balchunas