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The threat of intrusion into the network system not only from hackers, aka the employees in the company can do. Course requires an attention of an admin to the company network security system to maintain dijebol not in order. Here are 11 things that the writer of special concern for the reliability of the system administrator for a network security company where you work, to be to stay awake:

• Gullible and too trusting to the user / you, especially the female staff members or friends who ask for help.

• Building and the access door entrance / exit that is not certain.

• Documents and computer hard drives or peripherals that were not destroyed or not destroyed at the time to be thrown in the trash, be read by others.

• A weak password or even the network is not using a password system as a whole.

• Defense Network, which is less strong, for there is probably no firewall and so on.

• Access controls are weak, and some missing files that do not access to users who do not need should be granted.

• The system will not patch.

• Authentication and disclosure of information of a Web application is not done arbitrarily.

• Wireless system is running with the default settings and without WEP, WPA or WPA2, very risky and easy to hack

• SNMP on host tissue in a state of default on or only the host mode in the community so it is very easy to hack.

• Using a firewall, router, remote access and dial-up devices in a state of insolvency or password guest or the use of passwords that are too simple, since this entrance into the system hackers.

Here are some port that is done very often intrusion (hacking) by mischievous hackers and staff to try to hacking into a network security system:

• TCP ports 20 and 21 FTP (File Transfer Protocol)

• TCP Port 23 Telnet (Terminal Emulation)

• TCP port 25 SMTP (Simple Mail Transfer Protocol)

• TCP and UDP port 53 DNS (Domain Name System)

• TCP port 80 and 443, HTTP and HTTPS (Hypertext Transfer Protocol)

• TCP Port 110 POP3 (Post Office Protocol version 3)

• TCP and UDP port 135 RPC

• TCP and UDP ports 137-139 NetBIOS over TCP / IP

• TCP and UDP port 161 SNMP (Simple Network Management Protocol)

I also hope that some of this information can be used as a reference for the network admin for more care in securing their computer systems and networks

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