List and describe three improvements that IPv6 has over IPv4.
What will be an ideal response?
Larger address space-IPv4 addresses are 32 bits, which provide a theoretical four billion addresses. IPv6 addresses are 128 bits, so the number of possible addresses can be expressed as 34 followed by 37 0s, or 340 trillion trillion trillion.
Hierarchical address space-Unlike IPv4, in which numbers in the address have little meaning other than the address class, and the network ID and host ID, IPv6 addresses have a more defined structure.
Autoconfiguration-IPv6 can be self-configuring or autoconfigured from a router or server running IPv6 or through DHCPv6.
Built-in quality of service (QoS) support-IPv6 includes built-in fields in packet headers to support QoS strategies.
Built-in support for security-From the ground up, IPv6 is built to support secure protocols, such as Internet Protocol Security (IPsec).
Support for mobility-With built-in support for mobility, routing IPv6 packets generated by mobile devices over the Internet is more efficient than with IPv4.
Extensibility-IPv6 uses extension headers instead of IPv4's fixed-size 40-byte header.
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Select the false statement. If an exception is thrown from a constructor:
a. The object being constructed will not be constructed. b. For an array, destructors for all array elements are called, even if those array elements have not yet been constructed. c. The exception can contain the error information that the constructor would not be able to return in the normal manner. d. For an object with member objects, and whose outer object has not been constructed, the destructor is called for the member objects.
Which of the following statements is false?
a. Path method isAbsolute returns a boolean indicating whether a Path represents an absolute path to a file or directory. b. Files static method getLastModifiedTime receives a Path and returns a FileTime (package java.nio.file.attribute) indicating when the file was last modified. c. Files static method size receives a Path and returns a long representing the number of bytes in the file or directory. For directories, the value returned is platform specific. d. All of the above are true.
________ are functions that group and perform calculations on multiple fields
A) Aggregate functions B) Sum functions C) Calculated functions D) Grouped functions
Which aggregate function would NOT work well on a Short Text field?
A. Sum B. Min C. Max D. Count