Chapter Nine Troubleshooting Your Network

Their are five main software utilities for troubleshooting connectivity.
These five are the most common used command-line interface (CLI) utilities.
1.) ipconfig - it displays IP configuration information

2.) ping - it tests connections to other IP hosts

3.) tracert - it displays route taken to destination

4.) netstat - it displays network connections

5.) nslookup - it directly queries the name server for information on a destination domain.

Chapter Eight Basic Security

There are two types of threats: External and Internal

External threats are from individuals working outside an organization. They do not have authorized access to the computer system or network. The attacker can get into your network from Internet, wireless links, or dial-up access servers.

Internal threats are when someone has either authorized access to the network and through a user account or has physical access to the network equipment. The attacker usually knows the person they are attacking. The attacker often knows what information to use to get on different sites.