Section: Network and Telecommunications
Explanation/Reference:
Very-high data-rate Digital Subscriber Line (VDSL) can deliver up to 52 Mbps downstream over a single copper twisted pair over a relatively short distance (1000 to 4500 feet).
DSL (Digital Subscriber Line) is a modem technology for broadband data access over ordinary copper telephone lines (POTS) from homes and businesses. xDSL refers collectively to all types of DSL, such as ADSL (and G.Lite), HDSL, SDSL, IDSL and VDSL etc. They are sometimes referred to as last-mile (or first mile) technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations.
xDSL is similar to ISDN in as much as both operate over existing copper telephone lines (POTS) using sophisticated modulation schemes and both require the short runs to a central telephone office Graphic below from: http://computer.howstuffworks.com/vdsl3.htm

DSL speed chart
The following are incorrect answers:
Single-line Digital Subscriber Line (SDSL) deliver 2.3 Mbps of bandwidth each way.
High-rate Digital Subscriber Line (HDSL) deliver 1.544 Mbps of bandwidth each way.
ADSL delivers a maximum of 8 Mbps downstream for a total combined speed of almost 9 Mbps up and down.
Reference used for this question:
http://computer.howstuffworks.com/vdsl3.htm
and
http://www.javvin.com/protocolxDSL.html
and
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 115).

Explanation/Reference:
A one-way hash is a function that takes a variable-length string a message, and compresses and transforms it into a fixed length value referred to as a hash value. It provides integrity, but no confidentiality, availability or authentication.
Source: WALLHOFF, John, CBK#5 Cryptography (CISSP Study Guide), April 2002 (page 5).

Explanation/Reference:
A key should always be using the full spectrum of the keyspace and be extremely random. Other statements are correct.
Source: WALLHOFF, John, CBK#5 Cryptography (CISSP Study Guide), April 2002 (page 6).

The last login message displays the last login date and time, allowing a user
to discover if their account was used by someone else. Hence, this is rather a detective
control.
Source: RUSSEL, Deborah & GANGEMI, G.T. Sr., Computer Security Basics, O'Reilly,
July 1992 (page 63).