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CPE Switch The trunks or lines that you already have and those that are available to you from various telephone companies (carriers) will, in part, dictate what types of telephony products are applicable to your needs Assuming that you decide not to completely outsource all switching functionality, you'll need to choose a switch (or collection of switches) Your options in this category of customer premises equipment include: Front End Switch Key System Monolithic PBX Modular PBX iPBX The switch that you select will drive all the other service and equipment choices you make Gateways and IADs If you want to connect your switch to external networks that your switch doesn't support, such as an IP Telephony service on the Internet or your own private wide area network, then you'll need to install an appropriate gateways Gateways may be packaged in an integrated access device (IAD) which delivers not only telephony media streams but other services such as cable TV and internet service Media Servers Media servers are the basis for deploying customized telephone system solutions that involve automated interaction with callers Unless your switch came with a built-in set of accessible media resources, you'll need a media server to support applications ranging from customer selfservice inquiries to unified messaging Other Switch Peripherals and Options Other products to integrate with your switch range from uninteruptable power supplies to dedicated voicemail systems to administrative tools

The computing world came up with a number of derivatives of DES to try to address this issue, with names such as 3DES, International Data Encryption Algorithm (IDEA), and Blowfish On the streaming side the only symmetric-key algorithm you ll probably ever see is Rivest Cipher 4 (RC4) stream cipher RC4 was invented in the late 1980s by Ron Rivest, cryptographer and arguably the most famous of all inventors of TCP/IP security algorithms RC4 is used in a number of TCP/IP applications Over the years improvements in computing power made both DES and RC4 vulnerable to attacks in certain circumstances As a result almost all TCP/IP applications have moved to Advanced Encryption Standard (AES) AES is a block cipher, created in the late 1990s It uses a 128-bit block size and 128-, 192-, or 256-bit key size AES is incredibly secure, practically uncrackable (for now at least), and is so fast that even applications that traditionally used stream ciphers are switching to AES Not at all limited to just TCP/IP, you ll find AES used from file encryption to wireless networking to some Web sites Given that AES is still somewhat new, many TCP/IP applications are still in the process of moving toward adoption EXAM TIP When in doubt on a question about encryption algorithms, always pick AES You ll be right most of the time

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int menu(void) { char choice; do { printf(''Enter names (E)\n"); printf("Delete name (D)\n"); printf("Print (P)\n"); printf("Quit (Q)\n"); choice = getchar(); } while(!strchr("EDPQ", toupper(choice))); if(choice=='Q') exit(0); return choice; }

Telephone Stations No telephone system purchase decision would be complete without deciding on telephone stations Options for telephone stations are constrained by the choice of switch (or vice-versa) However, the selection of telephone station features and options to choose from is vast However it should be noted that the best phone interface of all is the right piece of CTI software running on a personal computer nearby (See 12) Telephone Station Peripherals Last but not least, there are a wide variety of add-ons available that connect to telephone stations or connect to extension circuits from the switch

Symmetric-key encryption has one serious weakness: anyone who gets ahold of the key can encrypt or decrypt data with it The nature of symmetric-key encryption forces us to send the key to the other person in one way or another, making it a challenge to use symmetric-key encryption safely As a result, there s been a strong motivation to create a methodology that allows the encryptor to send a key to the decryptor without fear of interception (Figure 11-5)

#include <stdlibh> void _Exit(int exit_code);

_Exit( ) was added by C99 The _Exit( ) function is similar to exit( ) except for the following: No calls to termination functions registered by atexit( ) are made No calls to signal handlers registered by signal( ) are made Open files are not necessarily flushed or closed Related Functions atexit( ), abort( ) and exit( ) getenv

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