Page 939 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

E3, and cable modems. A nondedicated line requires a connection to
be established before data transmission can occur. It can be used to

connect with any remote system that uses the same type of
nondedicated line. Standard modems, DSL, and ISDN are examples of
nondedicated lines.

Know various issues related to remote access security. Be
familiar with remote access, dial-up connections, screen scrapers,
virtual applications/desktops, and general telecommuting security

concerns.
Know the various types of WAN technologies. Know that most

WAN technologies require a channel service unit/data service unit
(CSU/DSU), sometimes called a WAN switch. There are many types of
carrier networks and WAN connection technologies, such as X.25,
Frame Relay, ATM, SMDS, SDH, and SONET. Some WAN connection
technologies require additional specialized protocols to support

various types of specialized systems or devices.

Understand the differences between PPP and SLIP. The Point-
to-Point Protocol (PPP) is an encapsulation protocol designed to
support the transmission of IP traffic over dial-up or point-to-point
links. PPP includes a wide range of communication services, including
assignment and management of IP addresses, management of
synchronous communications, standardized encapsulation,

multiplexing, link configuration, link quality testing, error detection,
and feature or option negotiation (such as compression). PPP was
originally designed to support CHAP and PAP for authentication.
However, recent versions of PPP also support MS-CHAP, EAP, and
SPAP. PPP replaced Serial Line Internet Protocol (SLIP). SLIP offered
no authentication, supported only half-duplex communications, had
no error-detection capabilities, and required manual link

establishment and teardown.

Understand common characteristics of security controls.
Security controls should be transparent to users. Hash totals and CRC
checks can be used to verify message integrity. Record sequences are
used to ensure sequence integrity of a transmission. Transmission
logging helps detect communication abuses.