Book Image

Networking Fundamentals

By : Gordon Davies
Book Image

Networking Fundamentals

By: Gordon Davies

Overview of this book

A network is a collection of computers, servers, mobile devices, or other computing devices connected for sharing data. This book will help you become well versed in basic networking concepts and prepare to pass Microsoft's MTA Networking Fundamentals Exam 98-366. Following Microsoft's official syllabus, the book starts by covering network infrastructures to help you differentiate intranets, internets, and extranets, and learn about network topologies. You’ll then get up to date with common network hardware devices such as routers and switches and the media types used to connect them together. As you advance, the book will take you through different protocols and services and the requirements to follow a standardized approach to networking. You’ll get to grips with the OSI and TCP/IP models as well as IPv4 and IPv6. The book also shows you how to recall IP addresses through name resolution. Finally, you’ll be able to practice everything you’ve learned and take the exam confidently with the help of mock tests. By the end of this networking book, you’ll have developed a strong foundation in the essential networking concepts needed to pass Exam 98-366.
Table of Contents (23 chapters)
Free Chapter
Section 1: Network Infrastructure
Section 2: Network Hardware
Section 3: Protocols and Services
Section 4: Mock Exams
Mock Exam 1
Mock Exam 2

Understanding static and default routes

Because we cannot document every network in a routing table, we need to know what to do with the data if the network is not listed. Quite simply, we have a catch-all route that, in essence, says if you have gone through the routing table and cannot find a match for this destination, then send it from this particular interface to this other router and let them sort it out. If the other router does not know, it will do the same.

Basically, we are playing pass the parcel with the data in the hope that it is finally received by a routing device that actually knows where the destination network is. Remember, the TTL will be counting down at each device. If no default route has been configured, then the data is simply discarded and an error message is sent back to the originating device.

A configured default route is a form of static route. An...