Netgear DGB111G Operations Instructions download pdf (Page 179)

Reference Manual for the Model Wireless ADSL Firewall Router DG834G

Network and Routing Basics B-11

202-10006-05, June 2005

Denial of Service Attack

A hacker may be able to prevent your network from operating or communicating by launching a

Denial of Service (DoS) attack. The method used for such an attack can be as simple as merely

flooding your site with more requests than it can handle. A more sophisticated attack may attempt

to exploit some weakness in the operating system used by your router or gateway. Some operating

systems can be disrupted by simply sending a packet with incorrect length information.

Ethernet Cabling

Although Ethernet networks originally used thick or thin coaxial cable, most installations currently

use unshielded twisted pair (UTP) cabling. The UTP cable contains eight conductors, arranged in

four twisted pairs, and terminated with an RJ45 type connector. A normal straight-through UTP

Ethernet cable follows the EIA568B standard wiring as described below in Table B-1

Category 5 Cable Quality

Category 5 distributed cable that meets ANSI/EIA/TIA-568-A building wiring standards can be a

maximum of 328 feet (ft.) or 100 meters (m) in length, divided as follows:

20 ft. (6 m) between the hub and the patch panel (if used)

295 ft. (90 m) from the wiring closet to the wall outlet

Table B-1. UTP Ethernet cable wiring, straight-through

Pin Wire color Signal

1 Orange/White Transmit (Tx) +

2 Orange Transmit (Tx) -

3 Green/White Receive (Rx) +

4Blue

5 Blue/White

6 Green Receive (Rx) -

7 Brown/White

8Brown

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 267 268

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Netgear DGB111G Operations Instructions Page 179