Errata

"nything" should be "anything"

The third sentence begins:

It can be ... a ping check, a port check, (to see if ...),
^
The comma before the parenthetical comment doesn't belong.

Additionally, the sentence ends:

or even a content check, in which the web server is queried ...

Because of the comma within that section, the other commas in the sentence probably
need to become semicolons.

The first sentence refers to connectivity to "the Internet, Extranet, or Intranet."
The Internet is capitalized because it is _the_ Internet, the biggest internet
(network of networks) of them all; but I'm aware of no grammatical or conventional
reason to capitalize "extranet" and "intranet."

The arrows to the rightmost two Real Servers are drawn in a heavier line weight than
the other arrows in that and other related figures. This emboldening doesn't appear
to be for any specific purpose.

The paragraph begins:

As introduced in Chapter 2, Direct Server Return ...

But I could find no reference to DSR anywhere in chapter 2. (I did spend a while
rereading chapter 2 to see whether I'd missed DSR's introduction.)

Discussion about traffic ratio, uses terms "in" and "out" without
clarification from whose perspecitive those are (server's? client's?).
Discussion of ratios on page 66 (first full paragraph) is much cleaner and easier to
understand (and I might mention, the use of "in/out" is from the server's perspective
instead of the clients).

Another reader has mentioned that the use of "inbound" and "outbound" in this
paragraph needs clarification. Not only that, but the terms are used in the first
sentence in opposition to their use in the last sentence (and in opposition to common
sense :-) ). The first sentence should probably read:

Web traffic has a ratio of about 1:8, which is one packet in for every eight packets
out.

or

Web traffic has a ratio of about 8:1, which is one packet out for every one packet
in.

The paragraph again claims DSR was introduced in Chapter 2, which it doesn't appear
to have been (at least by the time the book went to print).

Additionally, the second sentence has a misplaced modifier:

Since DSR does not involve the outbound traffic passing the SLB device, which is
typically the majority of a site's traffic, ...

The SLB device isn't traffic. Perhaps:

Since DSR does not involve the outbound traffic (typically the majority of a site's
traffic) passing the SLB device, ...

The fourth sentence is missing the word "able," inserted here:

The HTTP 1.1 standard makes things a little more efficient by making one connection
_able_ to retrieve several objects during a given session.

Section entitled:
"Return Traffic Management: Bridging-Path versus Routing-Path versus DSR"
only deals with bridging-path and routing-path. No mention of DSR is made.

"default toute for the web server" should be:
"default route for the web server"

"have access to the outbound to the network" should be:
"have access to the outbound network"

Within the private network part it should state "Layer 3 router Private Network Interface 10.0.0.1" instead of "Layer 3 router Publ
ic Network Interface 10.0.0.1".

"To understand how flat-based SLB works,....." should be "To understand how NAT-based SLB works,...."

Although the shared address for the public network (192.168.0.10) doesn't show in figures 7-1, 7-2 and 7-3 and the 4th paragraph on
page 67 explicitly states there is no default route on the public VLAN it is present in table 7-3 (3rd row), but shouldn't necessa
ry be in that table.