The Command Reference describes these
conventions as follows:
?– Boldface indicates commands and keywords that are entered literally as shown. In
actual con?¬?guration examples and output (not general command syntax), boldface
indicates commands that are manually input by the user (such as a show command).
?– Italics indicate arguments for which you supply actual values.
?– Vertical bars (|) separate alternative, mutually exclusive elements.
?– Square brackets [ ] indicate optional elements.
?– Braces { } indicate a required choice.
?– Braces within brackets [{ }] indicate a required choice within an optional element.
PC
Router Switch
IP Phone
IP
Network Cloud
CSU/DSU Hub Server
Access
Server
Multilayer Switch Route/Switch
Processor
Cisco ASA
Cisco
CallManager
VPN
Concentrator
PIX Firewall
Router with
Firewall
ATM Switch Web
Server
Mac
Serial Line
Connection
Ethernet
Connection
xviii
Foreword
Cisco certi?¬?cation self-study guides are excellent self-study resources for networking
professionals to maintain and increase internetworking skills, and to prepare for Cisco
Career Certi?¬?cation exams. Cisco Career Certi?¬?cations are recognized worldwide and
provide valuable, measurable rewards to networking professionals and their employers.
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