CompTIA Network+ Certification Guide

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Title Page

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Contributors

About the authors

About the reviewer

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Preface

Who this book is for

What this book covers

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Conventions used

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Reviews

The OSI Reference Model and the TCP/IP Stack

The OSI reference model

Relationship between the Protocol Data Unit (PDU) and Service Data Unit (SDU)

The seven layers of the OSI model

Application Layer

Presentation Layer

Session Layer

Transport Layer

Network Layer

Data Link Layer

Physical Layer

Communication using the relay system

The TCP/IP protocol suite

The four layers of the TCP/IP protocol suite

Communication using the TCP/IP protocol suite

Summary

Questions

Network Ports Protocols and Topologies

Technical requirements

Network port numbers

Network protocols

Protocol types

ICMP

ICMP message types

ICMP Type 0 – Echo Reply

ICMP Type 3 – Destination Unreachable

ICMP Type 5 – Redirect

ICMP Type 8 – Echo Request

ICMP Type 11 – Time Exceeded

TCP

User Datagram Protocol (UDP)

Comparison of TCP and UDP

IP

Protocols and ports

File Transfer Protocol (FTP)

Secure Shell (SSH) Secure Copy (SCP) and Secure FTP (SFTP)

Telnet

Simple Mail Transfer Protocol (SMTP)

Domain Name System (DNS)

Dynamic Host Configuration Protocol (DHCP)

Trivial File Transfer Protocol (TFTP)

Hypertext Transfer Protocol (HTTP)

Post Office Protocol (POP)

Network Time Protocol (NTP)

Internet Message Access Protocol (IMAP)

Simple Network Management Protocol (SNMP)

Lightweight Directory Access Protocol (LDAP)

HTTP Secure (HTTPS)

Server Message Block (SMB)

Remote Desktop Protocol (RDP)

Network topologies

Star

Ring

Bus

Hub and spoke

Mesh

Hybrid

Tree

Types of networks

Introducing Ethernet and its evolution

Summary

Questions

Further reading

Ethernet

What is Ethernet?

The sublayers of Ethernet

The Data Link Layer

The LLC sublayer

The MAC sublayer

Fields in an Ethernet frame

MAC addresses

Transmission types at the Data Link Layer

The CAM table

Summary

Questions

Understanding IPv4 and IPv6

IPv4 concepts

Converting binary into decimal

Converting decimal into binary

The format of an IPv4 packet

Public IPv4 addresses

Private IPv4 addresses

Subnet mask