how to generate barcode in asp net core

how to generate barcode in asp net core

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3 Make analog lines harder to find don t put them in the same range as the corporate numbers, and don t give out the phone numbers on the InterNIC registration for your domain name Password-protect phone company account information 4 Verify that telecommunications equipment closets are physically secure many companies keep lines in unlocked closets in publicly exposed areas 5 Regularly monitor existing log features within your dial-up software Look for failed login attempts, late night activity, and unusual usage patterns Use CallerID to store all incoming phone numbers 6 Important and easy! For lines that are serving a business purpose, disable any banner information presented upon connect, replacing it with the most inscrutable login prompt you can think up Also consider posting a warning that threatens prosecution for unauthorized use 7 Require two-factor authentication systems for all remote access Two-factor authentication requires users to produce two credentials in order to obtain access to the system something they have and something they know One example is the SecurID one-time password tokens available from Security Dynamics Technologies, Inc Okay, we know this is often logistically or financially impractical However, there is no other mechanism that will virtually eliminate most of the problems we ve covered so far See the Summary at the end of this chapter for some other companies that offer such products Failing this, a strict policy of password complexity must be enforced 8 Require dial-back authentication Dial-back means that the remote access system is configured to hang up on any caller and then immediately connect to a predetermined number (where the original caller is presumably located) For better security, use a separate modem pool for the dial-back capability, and deny inbound access to those modems (using the modem hardware or the phone system itself) This is also one of those impractical solutions, especially for many modern companies with tons of mobile users 9 Ensure that the corporate help desk is aware of the sensitivity of giving out or resetting remote access credentials All the preceding security measures can be negated by one eager new hire in the corporate support division 10 Centralize the provisioning of dial-up connectivity from faxes to voicemail systems within one security-aware department in your organization 11 Establish firm policies for the workings of this central division, such that provisioning a POTS (plain old telephone service) line requires nothing less than an act of God or the CEO, whichever comes first For those who can justify it, use the corporate phone switch to restrict inbound dialing on that line if all.

Popularity: Simplicity: Impact: Risk Rating: 10 10 3 8

FIGURE 9-8 Carflex X-Flex extra-flexible nonmetallic conduit (Carlon)

9:

As you ll recall from 2, nmap is the definitive port scanner of modern UNIXborn hackers Its uses vary from simple port scanning to determining live hosts on a given subnet or determining operating systems of remote hosts This robust monster of a tool has so many features that they cannot all be covered in this chapter (refer to 2 for more details) nmap is highly recommended; see man nmap on a UNIX machine running the product for more information Using nmap to perform our port scanning, we find out which ports our router (10142083) is listening on The type of ports found go a long way in identifying the type of router we have targeted Table 7-1 shows the common TCP and UDP ports found on the most popular network devices For a more complete list of default passwords, see http://wwwphenoelit-usorg/dpl/dplhtml If we were looking for Cisco routers, we would scan for TCP ports 1 25, 80, 512 515, 2001, 4001, 6001, and 9001 The results of the scan will tell us many things about the device s origin: