Network Fundamentals, CCNA Exploration Companion Guide

Network Fundamentals, CCNA Exploration Companion Guide

Language: English

Pages: 560

ISBN: 1587132087

Format: PDF / Kindle (mobi) / ePub


Network Fundamentals, CCNA Exploration Companion Guide is the official supplemental textbook for the Network Fundamentals course in the Cisco® Networking Academy® CCNA® Exploration curriculum version 4. The course, the first of four in the new curriculum, is based on a top-down approach to networking. The Companion Guide, written and edited by Networking Academy instructors, is designed as a portable desk reference to use anytime, anywhere. The book’s features reinforce the material in the course to help you focus on important concepts and organize your study time for exams.

 

New and improved features help you study and succeed in this course:

  • Chapter objectives—Review core concepts by answering the focus questions listed at the beginning of each chapter.
  • Key terms—Refer to the updated lists of networking vocabulary introduced and highlighted in context in each chapter.
  • Glossary—Consult the comprehensive glossary with more than 250 terms.
  • Check Your Understanding questions and answer key—Evaluate your readiness with the updated end-of-chapter questions that match the style of questions you see on the online course quizzes. The answer key explains each answer.
  • Challenge questions and activities—Strive to ace more challenging review questions and activities designed to prepare you for the complex styles of questions you might see on the CCNA exam. The answer key explains each answer.  

How To—Look for this icon to study the steps you need to learn to perform certain tasks.

 

Packet Tracer Activities— Explore networking concepts in activities interspersed throughout some chapters using

 

Packet Tracer v4.1 developed by Cisco. The files for these activities are on the accompanying CD-ROM.

 

Also available for the Network Fundamentals Course

Network Fundamentals, CCNA Exploration Labs and Study Guide

ISBN-10: 1-58713-203-6

ISBN-13: 978-1-58713-203-2

 

Companion CD-ROM

The CD-ROM provides many useful tools and information to support your education:

  • Packet Tracer Activity exercise files v4.1
  • VLSM Subnetting Chart
  • Structured Cabling Exploration Supplement
  • Taking Notes: a .txt file of the chapter objectives
  • A Guide to Using a Networker’s Journal booklet
  • IT Career Information
  • Tips on Lifelong Learning in Networking

 

 

This book is part of the Cisco Networking Academy Series from Cisco Press®. The products in this series support and complement the Cisco Networking Academy online curriculum.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

same priorities, and different institutions will assign data types into different categories according to their needs. After traffic types are categorized, they can be put into queues. Examples of priority decisions for an organization might include ■ Time-sensitive communication: Increase priority for services like telephony or video distribution. ■ Non-time-sensitive communication: Decrease priority for web page retrieval or e-mail. ■ High importance to organization: Increase priority for

language to describe networking functions and capabilities. ■ Assists in protocol design, because protocols that operate at a specific layer have defined information that they act upon and a defined interface to the layers above and below. As an IT student, you will benefit from the layered approach as you build your understanding of the network communication process. Protocol and Reference Models Networking professionals use two networking models to communicate within the industry: protocol

Addressing Service: File Transfer Service: Terminal Session Service: Electronic Mail File Transfer Data Port Number Terminal Session Data Port Number 03_20870ch02.qxd 58 10/11/07 10:21 AM Page 58 Network Fundamentals, CCNA Exploration Companion Guide Summary Communication in data networks requires a source device and a destination device with a medium connecting the two. For messages to travel to other networks, intermediary devices such as routers are necessary. The devices that

Datagram Protocol (UDP) UDP is a simple, connectionless protocol, described in RFC 768. It has the advantage of providing low-overhead data delivery. The segments of communication in UDP are called datagrams. UDP sends datagrams as “best effort.” Applications that use UDP include ■ Domain Name System (DNS) ■ Video streaming ■ Voice over IP (VoIP) Figure 4-6 illustrates a UDP datagram. Figure 4-6 UDP Datagram Bit (0) Bit (15) Bit (16) Source Port (16) Destination Port 16 Length (16)

route or a route to a remote network. The router can also use a default route to forward the packet. The default route is used when the destination network is not represented by any other route in the routing table. Host Routing Table Hosts require a local routing table to ensure that network layer packets are directed to the correct destination network. Unlike the routing table in a router, which contains both local and remote routes, the local table of the host typically contains its direct

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