tailieunhanh - Ethernet Networking- P11

Ethernet Networking- P11:One of the biggest problems when discussing networking is knowing where to start. The subject of computer networks is one of those areas for which you have to "know everything to do anything." Usually, the easiest way to ease into the topic is to begin with some basic networking terminology and then look at exactly what it means when we use the word Ethernet. | 288 Ethernet Example 2 Small-But-Growing Real Estate The physical placement of equipment doesn t necessarly mirror the logical network arrangement. The router the firewalls and the switches will be mounted in a single rack that is placed in the current equipment room. The file server and fax server can also be placed in the equipment room. At least one and perhaps two of the desks that currently support stand-alone PCs can be removed. One might be needed for the file server and another for the fax server. What about security Now that users can access e-mail and the multiplelisting services from their desktops the equipment room can be locked. It can be secured with a smart-lock that uses an entry code. Only those involved in maintaining the hardware should have access to that room. The two hardware firewalls specialized appliances running firewall software provide significant protection. As mentioned earlier the firewall that isolates the Web server admits Web requests but the firewall that isolates the internal network does not. The internal network s firewall lets Web requests go out and admits responses to requests from the internal network however. Despite the firewalls the file server should be protected with passworded user accounts. Because users on the internal network will be downloading e-mail some of which will have attachments they should have up-to-date virus and malware protection software as well as personal firewalls. And as always user education about safe downloading avoiding social engineering threats and other secure behaviors is essential. 14 Network Example 3 Small Law Firm Small Law Firm SLF is a 55-year-old law firm that will be moving from offices on three floors of an old building into two floors of an office tower currently under construction several blocks away from its current location. SLF has been given the opporunity to wire its floors for telecommunications while construction is still in progress. SLF has 30 attorneys 10 of whom are