Chapter 3 notes

Topics: Wireless access point, IP address, Wi-Fi Pages: 23 (2990 words) Published: April 14, 2014
8/30/2012

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

Protecting Your Network

Objectives

Chapter 16

• Discuss the common security threats in
network computing
• Describe the methods for securing user
accounts
• Explain how firewalls, NAT, port
filtering, and packet filtering protect
a network from threats

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

Introduction to protecting your
network

Overview

• What are the threats to networks?
– Hackers, etc.
– Authorized users with good intentions
– Natural disasters
– A network threat is anything that can potentially
damage network data, machines, or users

• Explore tools and methods for protection
© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

Three parts to Chapter 16
• Common threats
• Securing user accounts
• Firewalls

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Common threats

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

1

8/30/2012

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• Summary of common threats
– System crashes/other hardware failures
– Administrative access-control weaknesses
– Malware, such as viruses and worms
– Social engineering
– Denial of Service attacks
– Physical intrusion
– Attacks on wireless connections
© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• Administrative access control
– Access control list
– Powerful administrative tools
– Need to keep tools secure
– “Super accounts”
• Windows Administrator account
• Linux and Mac OS X root account

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• System crash/hardware failure
– Types of failures
• Hard drive crash
• Servers lock up
• Power fails

– Redundancy in areas prone to failure
• Power backup system
• Data backups
• Hardware redundancy for fault tolerance
© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• Malware
– Code designed to do something bad
– Virus
• Has two jobs

–Replicate
»Makes copies of itself to disks
–Activate
»Does something bad
• Needs some type of human action to spread

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• Malware (cont.)
– Worm
• Identical in function to a virus

•Replicates exclusively through networks
•Sends out copies of itself
•Can exploit flaws in program code

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

© 2012 The McGraw-Hill Companies, Inc. All rights reserved.

Mike Meyers’ CompTIA Network+® Guide to Managing and
Troubleshooting Networks, Third Edition (Exam N10-005)

• Malware (cont.)
– Macro
• Any virus exploiting application macros to
replicate and activate
• Exists in any application that has built-in
macro language
–...
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