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The free( ) function returns the memory pointed to by ptr to the heap This makes the memory available for future allocation It is imperative that free( ) only be called with a pointer that was previously allocated using one of the dynamic allocation system's functions Using an invalid pointer in the call most likely will destroy the memory management mechanism and possibly cause a system crash If you pass a null pointer, free( ) performs no operation Example This program allocates room for the strings entered by the user and then frees the memory:

The CompTIA Network+ certification exam expects you to know how to 11 Explain the function of common networking protocols (such as HTTPS and SSH) 63 Explain the methods of network access security (such as ACL, tunneling, and encryption) 64 Explain methods of user authentication (such as PKI, Kerberos, AAA, 8021x, CHAP, MS-CHAP, and EAP) 65 Explain issues that affect device security (such as physical security, restricting local and remote access, and secure versus unsecure methods) To achieve these goals, you must be able to Discuss the standard methods for securing TCP/IP networks Compare TCP/IP security standards Implement secure TCP/IP applications

#include <stdlibh> #include <stdioh> int main(void) { char *str[100]; int i; for(i=0; i<100; i++) { if((str[i] = malloc(128))==NULL) { printf (''Allocation Error\n"); exit (1); }

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Conventional configuration management tools have been limited to rudimentary command line interfaces These are typically implemented using serial ports and text-based terminals or telephone stations with text displays Command line interfaces require administrators to learn the unique and specialized commands for a given telephone system and this limits the availability of staff that can perform these tasks, increases the likelihood of error, and increases the expense associated with performing telephone system administration

If you really want to get into the minds of the folks who invented TCP/IP, you merely have to look at TCP/IP from the aspect of security While today the first creators of TCP/IP are now lauded professors and leaders in our field, at the time they were for the most part pretty much just a bunch of hippies who never seriously considered the idea that evil people would get on their beloved networks and do naughty things No part of TCP/IP has any real security Oh sure, you can put user names and passwords on FTP, Telnet, and the like, but everything else is wide open Those hippies must have thought that the intent of the Internet was openness Sadly, today s world shows a totally different perspective Every device with a public IP address on the Internet is constantly bombarded with malicious code trying to gain some level of access to our precious data Even data moving between two hosts is relatively easily intercepted and read Bad guys are making millions stealing our data in one of a thousand different ways, and TCP/IP in its original form is all but powerless to stop them This chapter takes you on a tour of the many ways smart people have improved TCP/IP to protect our data from those who wish to do evil things to it It s an interesting story of good intentions, knee-jerk reactions, dead ends, and failed attempts that luckily ends with a promise of easy-to-use protocols that protect our data

Page 436 gets(str[i]); } /* now free the memory */ for(i=0; i<100; i++) free(str[i]); return 0; }

#include <stdlibh> void *malloc(size_t size);

A key trend in the development of administrative interfaces for telephone system components is a move to mainstream web browsers to provide a graphical user interface for system administration that can be accessed from any computer on a company's IP network Telephone system vendors are implementing their administrative interface as embedded web servers that allow administrators to log on with a secure connection and to perform all configuration activities from taking devices off-line to configuring the lamps and buttons on telephone stations through a web interface This is another example of using off-the-shelf computer technology to simplify administration and to make administrative tools platform independent

This chapter examines the ways to make TCP/IP data and networks secure I ll first give you a look at concepts of security, then turn to specific standards and protocols used to implement security The chapter wraps with a discussion on secure TCP/IP applications and their methods

The malloc( ) function returns a pointer to the first byte of a region of memory of size size that has been allocated from the heap If there is insufficient memory in the heap to satisfy the request, malloc( ) returns a null pointer It is always important to verify that the return value is not null before attempting to use it Attempting to use a null pointer will usually result in a system crash Example This function allocates sufficient memory to hold structures of type addr:

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