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The calloc( ) function allocates memory the size of which is equal to num * size That is, calloc( ) allocates sufficient memory for an array of num objects of size size All bits in the allocated memory are initially set to zero The calloc( ) function returns a pointer to the first byte of the allocated region If there is not enough memory to satisfy the request, a null pointer is returned It is always important to verify that the return value is not null before attempting to use it Example This function returns a pointer to a dynamically allocated array of 100 floats:

Provisioning refers to adding a new device to a system This includes creating new entries in the telephone system's configuration database for the device and establishing all the associated device and user related settings for the new device

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A Restart the DHCP server B Restart the DNS server C Replace the NIC on the server, because it has failed D Have your users PING the server 5 What are the two reasons to use a WINS server A To reduce overhead from broadcasts B To facilitate broadcast of NetBIOS names C To support Windows XP systems on IP networks D To enable NetBIOS name resolution across routers 6 What command do you use to check the current NetBIOS name cache A netstat n B netstat c C nbtstat n D nbtstat c 7 A user calls to say she can t see the other systems on the network when she looks in My Network Places You are not using NetBIOS What are your first two troubleshooting steps A PING the address of a known Web site B PING the loopback address to test her NIC C PING several neighboring systems using both DNS names and IP addresses D PING the IP addresses of the router 8 When troubleshooting a network using NetBIOS, what command do you use to see if the other local systems are visible A nbtstat B net view C nbt view D view local 9 What is checked first when trying to resolve an FQDN to an IP address A HOSTS file B LMHOSTS file C DNS server D WINS server

#include <stdlibh> #include <stdioh> float *get_mem(void) { float *p; p = calloc(100, sizeof(float)); if(!p) {

10 Which type of DNS record is used by mail servers to determine where to send e-mail A A record B CNAME record C MX record D SMTP record

923 Moves, Adds, and Changes (MACs)

Page 435 printf("Allocation Error\n"); exit(1); } return p; }

#include <stdlibh> void free(void *ptr);

1 D NetBIOS uses a flat name space while DNS servers use a hierarchical name space 2 A The DNS root directory is represented by a dot () 3 C To see the DNS cache on a Windows system, run the command ipconfig /displaydns at a command prompt 4 C You should replace the server s NIC, because it s bad It doesn t need either DNS or DHCP to PING its loopback address Having the users PING the server is also pointless, as you already know they can t connect to it 5 A, D Two reasons to use a WINS server are to reduce overhead from broadcasts and to enable NetBIOS name resolution across routers WINS servers eliminate the need for broadcasting NetBIOS names They are needed by Windows 9x and NT systems running on IP networks; WINS is not even native to Windows 2000 and XP 6 D You use the nbtstat c command to check the current NetBIOS name cache 7 B, C Your first two troubleshooting steps are to PING the loopback address to check the client s NIC and to PING neighboring systems If the NIC and the local network check out, then you might try pinging the router and a Web site, but those are later steps 8 B When troubleshooting a network using NetBIOS, use the net view command to see if the other local systems are visible 9 A The HOSTS file is checked first when trying to resolve an FQDN to IP address 10 C The MX record is used by mail servers to determine where to send e-mail

The most common configuration tasks are known as MACs which stands for moves, adds, and changes Whenever an employee is hired, changes locations, or leaves a company the telephone system's configuration information must be immediately updated to reflect the change

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