Novice sysadmins (was: Suggestions for a more privacy conscious email provider)

William Herrin bill at
Wed Dec 6 00:09:45 CST 2017

On Tue, Dec 5, 2017 at 6:11 PM, Scott Weeks <surfer at> wrote:
> Have you seen neteng certs lately?  I'm forced to maintain a
> lower level one to keep my job and it makes me angry every
> time I have to do it.  The sales pitch is hidden in the words
> and the correct answer is almost always something that has to
> do with the proprietary item the vendor has.

Even the relatively good ones are bad. I have identified 60 and am on track
to identify about 200 errors in the official ISC2 CISSP study guide.

"However, UDP should only be used when the delivery of data is not

List of Layer 5 (Session) protocols:

Regarding IPv6 SLAAC: "Autoconfiguration removes the need for both DHCP and

"A static packet-filtering firewall [is unable] to tell whether a packet
originated from inside or outside the private network."

"Examples of dedicated lines:
Technology, Connection Type, Speed
Digital Signal Level 0 (DS-0), Partial T1, 64 Kbps up to 1.544 Mbps
Digital Signal Level 1 (DS-1), T1, 1.544 Mbps"

"The web application then switches to a subject role as it queries the
user's computer to retrieve a cookie"

"Plenum-grade cable must be used [...] if the building has enclosed spaces
that could trap gases."

Stop. No. Just no. Plenum-grade cable must be used in a -plenum-. A plenum
is an air-handling space like the inside of a furnace duct. The only reason
we care about plenum cable in our jobs is that most offices take a shortcut
and turn the entire area above the ceiling tiles in to a giant return-air
duct for the air conditioner. That's why the return-air grill is simply
open into the ceiling. If you burn crap in an air-handling space, the fumes
aren't trapped: they almost immediately spread throughout the office.
That's bad, so we use different cable than what we put under the desk where
the fumes will tend to stay near where they started.

Trap gases? No! Plenum is for where the gases would quickly spread!

Bill Herrin

William Herrin ................ herrin at  bill at
Dirtside Systems ......... Web: <>

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