In one of the companies that I worked, they have an "Initial Test" for any Engenier;

They ask you, Are you an Engenier?, then do a Patch cord, here are the tools, make 1 with B Standard.

That is the way to show that you are a good engenier... jajaja

In network almost every core device (routers, switches and servers) may be NTP Master or Server. It depends on network design who will be the NTP Master, for me is the device which is "closest" to Internet.

@mary said in Cloud Services and Delivery Models - CompTIA Network+ N10-007 Prof. Messer:

At what point is it worth having your own data center? I would think the cost of it wouldn't be worth it for most.

Your own, meaning you own the facility rather than colo? That one is pretty easy....

You would go to your own datacenter when the cost to get the features you need from colo exceeds the cost to build and maintain your own (this would likely happen at around 15-60% of filling a single colo location.) And your staffing needs will play into this, if the colo has 24x7 support, and you only need 16x6, you might lower your own cost that way.

This is assuming you don't need the flexibility of putting equipment in and out from time to time or using multiple sites for it, like colo easily allows.

@mary said in Wireless Network Technologies - CompTIA Network+ N10-007 Prof. Messer:

Do the frequencies used self modulate within the router? What I'm wondering is if when setting up a dsl connection if it automatically defaults to a specific frequency or is it constantly switching.

DSL is the wired bit. Wifi is from the access point. And this will depend on the protocol chosen. 802.11 b for example requires thebfrequency be set.

@scottalanmiller said in Network Topologies - CompTIA Network+ N10-007 Prof. Messer:

@Dashrender said in Network Topologies - CompTIA Network+ N10-007 Prof. Messer:

@mary said in Network Topologies - CompTIA Network+ N10-007 Prof. Messer:

Did I understand him correctly saying there are still ring networks used by metropolitan areas?

Resilient fiber networks frequently have two fibers - one going in each direction. It's often called a fiber ring.

But should not be, that's not a ring.

Yes, it is. Looks like this for example:

alt text

Network topology is a ring. But it's still good ol' ethernet.

I believe each blue line is a bidirectional link. So that each switch has two incoming links and two outgoing links. This type of topology is very common for a backbone where you have long distances. While a full mesh network is more resilient it requires a lot more fiber.

Interesting.

@Dashrender said in IPv6 Subnet Masks - CompTIA Network+ N10-007 Prof. Messer:

It's absolutely true that IPv6 gives us billions and billions of small networks worth of IPs(each of those smalls being likely larger than the full IPv4)

Right, both are just a flexible pool. One is just way, way bigger.

@scottalanmiller exactly what I was looking for!

@Dashrender said in Classful Subnetting - CompTIA Network+ N10-007 Prof. Messer:

they aren't something that's really in use anymore,

Since the 90's......
CIDR was introduced in 1993
https://en.wikipedia.org/wiki/Classful_network