Once you make a backup copy of a file, it cannot be reused. 

Suppose the string class defines operator== as a class member with a single string parameter. Assume that no other operator== are defined, that a constructor for string from const char * is defined, but operator const char* () is not defined. s is of type string. Which of the following is illegal?

a. s==s b. s=="junk" c. "junk"==s d. all are illegal e. all are legal

Include the IP source address and IP destination address from the IP header data of an ICMP Echo Request and the corresponding ICMP Echo Reply packet before and after it passes through Router2.

What will be an ideal response?