Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

There are three styles for code. Code words in text are shown as follows: "You can set it explicitly for the ping and traceroute commands."

A block of code will be set as follows:

C: HEAD / HTTP/1.1;;
C: Host: www.iana.org
C:
S: HTTP/1.1 200 OK
S: Date: Tue, 20 Dec 2005 21:17:06 GMT
S: Server: Apache/1.3.27 (Unix) (Red-Hat/Linux)
S: Last-Modified: Thu, 04 Nov 2004 19:34:30 GMT
S: ETag: "1acad9-153a-418a8446"
S: Accept-Ranges: bytes
S: Content-Length: 5434
S: Connection: close
S: Content-Type: text/html

When we wish to draw your attention to a particular part of a code block, the relevant lines or items will be made bold:

+ FRAME: Base frame properties

+ ETHERNET: ETYPE = 0x0800 : Protocol = IP: DOD Internet Protocol
IP: ID = 0x673D; Proto = ICMP; Len: 84
IP: Version = 4 (0x4)
IP: Header Length = 44 (0x2C)
+ IP: Service Type = 0 (0x0)
IP: Total Length = 84 (0x54)
IP: Identification = 26429 (0x673D)
+ IP: Flags Summary = 0 (0x0)
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 32 (0x20)

New terms and important words are introduced in a bold-type font. Words that you see on the screen, in menus or dialog boxes for example, appear in our text like this: "clicking the Next button moves you to the next screen".

Note

Warnings or important notes appear in a box like this.