CCENT/CCNA: ICND1 100-105 Certification Guide电子书

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CCENT/CCNA: ICND1 100-105 Certification Guide

Dedication

Packt Upsell

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PacktPub.com

Contributors

About the author

About the reviewer

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Preface

Who this book is for

What this book covers

To get the most out of this book

Download the color images

Conventions used

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Introduction to Computer Networks

From ARPANET to internet

What is a computer network?

Requirements for designing a computer network

Types of computer networks

Personal area network (PAN)

Local area network (LAN)

Metropolitan area network (MAN)

Wide area network (WAN)

Intranet

Extranet

Computer network topologies

Physical topology

Bus

Ring

Star

Extended star

Hierarchical

Mesh

Logical topology

Computer network components

Clients

Servers

Hosts and nodes

Network interface

Peripheral devices

Applications and shared data

Hubs and switches

Routers

Infrastructure components

Firewall

Wireless access point

Wireless access controller

Computer network architectures

Peer-to-peer networking (P2P)

Client/server networking

Network operating system (NOS)

Windows

Linux

macOS X Server

Network medium

Twisted pairs

Coaxial

Fibre optic

Infrared and Bluetooth

Radio waves

Satellite

Converged networks

Growing complexity of networks

Elements of converged networks

Access, distribution, and core layers

Network trends

Summary

Questions

Communication in Computer Networks

How do computers communicate?

Message encoding

Message formatting and encapsulation

Message size

Message timing

Message delivery types

Unicast transmission

Multicast transmission

Broadcast transmission

Types of communication channels

Simplex

Half-duplex

Full-duplex

Communication protocols

Characteristics of communication protocols

Connection-oriented protocols

Connectionless protocols

Circuit switching versus packet switching

Well-known communication protocols

OSI and TCP/IP model overview

TCP/IP protocol model

OSI reference model

OSI layers and their protocols

Physical layer protocols

Data link layer protocols

Network layer protocols

Transport layer protocols

Session layer protocols

Presentation layer protocols

Application layer protocols

Ethernet communication technology

Ethernet history

Ethernet protocols

Ethernet frame

Ethernet MAC addresses

Ethernet's CSMA CD vs. Ethernet's CSMA CA

The IP addresses and subnets

IPv4 network addresses

Public IP addresses

Private IP addresses

Loopback IP address

Automatic Private IP Addressing (APIPA)

Unicast, multicast, and broadcast addresses

Class A addresses

Class B addresses

Class C addresses

Class D addresses

Class E addresses

IPv6 network addresses

Global unicast addresses

Link-local addresses

Unique local addresses

Loopback address

"This host, this network" address

Multicast addresses

Anycast

Autoconfiguration

Subnetting

Classful subnetting

Classless subnetting

IPv6 subnetting

Summary

Questions

Introduction to Switching

What is switch?

Switch essentials

MAC address table

MAC learning and aging

Frame switching

Frame flooding

Switching general concepts

Ingress and egress ports

Source and destination MAC addresses

Unicast MAC address

Multicast MAC address

Broadcast MAC address

Switched networks

The role of switched networks

Features of the switch

Fixed configuration switches

Modular configuration switches

Stackable configuration switches

Frame forwarding methods

Store-and-forward switching

Cut-through switching

Fast-forward switching

Fragment-free switching

Switching domains

Collision domains

Broadcast domains

Network congestion

Switch port settings

Duplex and speed settings

Auto-MDIX

Overview of VLANs

VLAN segmentation

VLANs in a multiswitched environment

VLAN trunks

Inter-VLAN operation

Ethernet's frame overview

Ethernet frame encapsulation

Ethernet frame fields

Ethernet frame processing

Switch security

Secure remote access

Telnet

SSH

Port security operation

Summary

Questions

Setting Up the Switch

Basic switch configuration

Configuration with initial settings

Boot sequence

LED indicators

Connecting to a switch and running initial configuration

Configuring basic management access

Configuring ports

Configuring VLANs

Configuring VLAN trunks

Configuring legacy inter-VLAN routing

Scenario – Router with multiple interfaces

Verifying VLAN information on a switch

Configuring router-on-a-stick inter-VLAN routing

Scenario – Router with a single interface

Verifying VLAN information on a switch

Configuring remote access

Configuring Telnet

Configuring SSH

Configuring switchport security

Summary

Questions

Introduction to Routing

Routing concepts

Understanding host routing

Host forwarding decisions

Default gateway

Host routing tables

Routing operations

Switching packets

Router switching functions

Sending packets

Packet routing

Forward to next-hop

Reaching the destination

Path determination

Routing decision

Selecting the best path

Network Load Balancing (NLB)

Administrative distance (AD)

What is a router?

A router is a computer

Router's CPU and OS

Anatomy of a router

Connecting to a router

LAN and WAN interfaces

Boot up the router

Router's boot up process

Bootset files

Router routing tables

Understanding packet forwarding

IPv4 routing table

Directly connected routing table entries

Remote network routing table entries

Next-hop IP address

Routing types

Static routing

Static route applications

Dynamic routing

Dynamic routing protocols

Routing table terms

Summary

Questions

Setting up the Router

Connecting the router to a PC and turning it on

Router LED indicators

Console access

Turning on the router

Show version output

Router's initial configuration

Configuring basic router settings

Configuring IPv4 and IPv6 addresses on router interfaces

Configuring static routes and default static routes

Configuring IPv4 static routes and default static routes

Configuring IPv6 static routes and default static routes

Configuring Routing Information Protocol (RIP)

InterVLAN configuration

Router-on-a-stick interVLAN configuration

Summary

Questions

Networking Services and Maintenance

Dynamic Host Configuration Protocol overview

Assigning IPv4 addresses dynamically

Configuring DHCPv4

Assigning IPv6 addresses dynamically

Configuring stateless DHCPv6

Configuring Stateful DHCPv6

Network Address Translator overview

Configuring static NAT

Configuring dynamic NAT

Configuring PAT

Configuring port forwarding

NAT and IPv6

Network Time Protocol overview

Configuring and verifying NTP

Cisco Discovery Protocol and Link-Layer Discovery Protocol overview

Device discovery with CDP

Device discovery with LLDP

System logging overview

Configuring syslog

Device maintenance

Router and switch file maintenance

Router file systems

Switch file systems

Backing up and restoring text files

Backing up and restoring to/from TFTP

Using USB ports on a Cisco router

Backing up and restoring to/from a USB flash drive

Password recovery using ROMMON

IOS system files

IOS 15.0 system image packaging

IOS image filename

IOS image management

TFTP servers as a backup location

Steps to back up an IOS image to a TFTP server

Copying an IOS image to a device

The boot system command

Software licensing

Licensing overview

Licensing process

License verification and management

License verification

Activating an evaluation right-to-use license

Backing up the license

Uninstalling the license

Traffic management

Summary

Questions

Network Troubleshooting

Troubleshooting methodologies

Basic approaches

Resolve or escalate?

Verifying and monitoring solutions

Troubleshooting scenarios

IP addressing issues on networking devices

IP addressing issues on end devices

Default gateway issues

Troubleshooting DNS issues

Troubleshooting cables and interfaces

Cable problems

Duplex operation

Duplex mismatch

Switch troubleshooting

Recovering from a system crash

Network access layer issues

Troubleshooting network access layer issues

Ports in error-disabled state

Router troubleshooting

Verifying IPv4 interface settings

Verifying IPv6 interface settings

The show history command

Troubleshooting a missing route

Solving a connectivity problem

Troubleshooting VLANs

IP addressing issues with VLANs

Troubleshooting Access Control Lists

Processing packets with ACLs

Common IPv4 standard ACL errors

Troubleshooting DHCP

Troubleshooting DHCPv4

Troubleshooting DHCPv6

Troubleshooting NAT

The show ip NAT commands

The debug ip NAT command

Basic network performance

The ping command

The traceroute and tracert commands

The show commands

Command syntax

The debug command

Network security

Security threats and vulnerabilities

Network attacks

Network attack mitigation

Device security

Summary

Questions

Studying and Preparing for ICND 1 (100-105) Exam

What is the ICND 1 (100-105) exam?

What are the ICND 1 (100-105) exam topics?

Topic 1.0–Network fundamentals (20%)

Topic 2.0 - LAN switching fundamentals (26%)

Topic 3.0 - Routing fundamentals (25%)

Topic 4.0 - Infrastructure services (15%)

Topic 5.0 – Infrastructure maintenance (14%)

What to expect in the ICND 1 (100-105) exam

How to prepare for the ICDN 1 (100-105) exam

How to register for the ICND 1 (100-105) exam?

On the day of the ICND 1 (100-105) exam

Post-ICND 1 (100-105) exam certification path

Appendix A: Answers to Chapter Questions

Chapter 1–Answers

Chapter 2—Answers

Chapter 3—Answers

Chapter 4—Answers

Chapter 5—Answers

Chapter 6—Answers

Chapter 7—Answers

Chapter 8 — Answers

Appendix B: Cisco Device Icons

Cisco network topology icons

Appendix C: Numbering Systems and Conversions

Binary numbering system

Decimal to binary conversion

Binary to decimal conversion

Octal numbering system

Decimal to octal conversion

Hexadecimal numbering system

Decimal to hexadecimal conversion

Appendix D: Boolean Algebra

AND operation

OR operation

NOT operation

Appendix E: Subnetting

Example—Class A subnetting

Example—Class B subnetting

Example—Class C subnetting

Appendix F: Cisco Packet Tracer

Downloading Packet Tracer

Installing Packet Tracer

Appendix G: Graphical Network Simulator-3 (GNS3)

Downloading GNS3

Installing GNS3

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