SSCP Reviews Questions

Any opening of an internal network to the Internet is susceptible of creating a new vulnerability.

Of the given rules, the one that permits all inbound tcp connections is the less likely to be used since it amounts to almost having no firewall at all, tcp being widely used on the Internet.

Reference(s) used for this question:

ALLEN, Julia H., The CERT Guide to System and Network Security Practices, Addison-Wesley, 2001, Appendix B, Practice-Level Policy Considerations (page 409).

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).

Multiplexers are devices that enable enables more than one signal to be sent out simultaneously over one physical circuit.

Source: 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 118).

Source: TIPTON, Hal, (ISC)2, Introduction to the CISSP Exam presentation.