Comparison of topologies Puns

Hi all. Last year in college and as a networking intern. I'm looking for tricks, tips, and information here.

I've just been tasked with mapping the entirety of our campus access layer's connections up to our distro layer. This, from top to bottom, contains: 2 distro switches, 7 aggregate switches, 83 access switches.

I need to map every single connection (not really concerned with the "why" at the moment, more concern with the "how") between these devices. There are not cleanly organized anywhere - I simply have a list of there physical interfaces and each device's CDP information.

Aside from going through each device individually, drawing it's connections, and trying to remember where each one is the diagram whilst drawing future connections... how do I handle this without spending the next week or two drawing and redrawing lines?

Title says it all really. I dropped out of my topology class in my 3rd year of uni.

Don’t get me wrong, it’s a branch of maths that I’ve always found fascinating and something I’d definitely love to try again in the future, but not right now.

I think it’s partly because of a combination of me struggling to grasp the key concepts quick enough, a lecturing style that is far from anything I’ve experienced before, and barely scraping a pass in the midterm because I thankfully knew the definitions that were asked (more of a fluke than anything). I also have very little confidence in proving new results, so half of the midterm was effectively off limits for me.

The main thing though, and I feel this is important for everyone, I came out of every lecture completely demoralised and dreading going back.

That’s never happened for any other class, and it’s certainly not healthy.

The moment I saw the next homework assignment, and realised I had pretty much no intuition on how to answer any of the 9 (!) questions, it flicked a switch and I knew I had to get out.

I only wish I’d dropped it sooner because it was negatively affecting my mental health. Thankfully my grades in other classes were doing just fine, but I didn’t want to risk anything for the upcoming final exams.

I have the upmost respect for anyone who is comfortable with Topology, and I hope one day I’ll eventually become comfortable with it myself.

TLDR: I dropped Topology, look after your mental health kids

Hey all,

We have a leaf/spine network with a set of border leaves connected to a firewall (ASA). I'm looking for any advice as to how we could potentially move our setup to pure layer 3, having layer 2 adjacency only on point to point links.

See the following diagram for the current setup: https://imgur.com/a/rdsLc8f

The outside interface of our firewall is connected to a switch , and upstream routers provide a VRRP IP for the default gateway to the internet. We do NAT translations at the firewall for public access to internal private IPs, and we do SNAT for private IPs at the firewall for them to reach the internet.

On the inside interfaces of the firewall, we peer it with BGP to each of the border leaves. The firewall announces a default route into the spine/leaf topology.

What I'm interested in doing is something like this: https://imgur.com/a/QzEy1k5 (edited to show router + firewall active/standby adjacency)

Ideally each side of the firewall (inside and outside) would be BGP peered, and there would be no VRRP. The problem I'm not sure if I can overcome is when NAT comes into play. Are there any ways to make this work where I can have both internal private IPs SNAT to the internet and have NAT rules that map public IPs to private internal IPs? I'm not sure if traffic zones would help here in an async routing case.

Thanks!

Both of these devices are connected to the network (Red-o-licious=wifi, Drobo=wired).

The Drobo has a bonded connection (or at least thats what it says on the device UI), but i have another device that is 'teamed' and the 2nd port doesn't show for that device.

The 'Red-o-licious' (wifes phone) really confuses me though :/

https://preview.redd.it/tyt8uaicng541.png?width=869&format=png&auto=webp&s=b5be9778ae7834a1c8146a95d16d5f70e46981df

Hi y'all. Apologies in advance if the question is lame / "soft". I just finished a summer semester in General Topology with M.A. Armstrong's Basic Topology. I got through it ok but we moved at such a fast pace that I'll have to go back over the material at some point to get a better understanding of it. So, my wife was asking me about the course and what it was about and I was having a hard time giving her an answer that didn't involve the technical details as I thought I understood them at the time. All I could say was "related to geometry...connectedness..sets..check out this Klein bottle.."

I'm just not sure how to informally generalize it if that's even the right term. Any help or insight would be appreciated, thanks for the time.

I'm an undergrad just starting out point-set topology, and there's something I'm trying to wrap my head around.

The concept of an open set S, where every point x in S has a ball B(x) contained entirely in S makes a lot of sense to me.

But then I see another definition of an open set, that given topological space (X, T), if S is an element of T, then it is also called an open set. Are these two somehow related/equivalent ? Everything I've looked at presents these two ideas of open sets without so much as an explanation.

Also, whenever I see the requirements for T (i.e., it contains X, the empty set, all arbitrary unions and finite intersections of elements from T), it never says that the sets contained in T have to be open, in the former sense.

This particular section I am completely out of ideas on how to handle.

I'm trying to figure out / get better with topology but I'm just so bad at it, and after how many years I've done 3D modelling, it's embarrassing that I still can't figure out topology. What would be a good way to do this? I also don't know how to do proper topology for bevel/curved edges like shown.

Beveled/curved edge. Not sure how to topologize.

Circular hole in geometry. Not sure how to topologize.

Do you think a course in topology(using a book like Munkres) or algebraic topology(using something like Hatcher) or differential topology(Lee or G&P) is useful for a physicist who works in HEP?

Let's say we have the intervals A = (-infinity, -1] and B = [1, infinity) in R. The union of A and B should be disconnected intuitively. But how could you define open sets that divide A u B? A and B are not open in R, but if we did, say, U = (-infinity, -1) and V = (1, infinity), then that leaves out -1 and 1, but if you did U = (-infinity, 0) and V = (0, infinity), that includes extra points in R. Is this space actually somehow connected? Or do the extra points not matter or something? Or are A and B secretly open sets when you consider them separately or something like that?

Let D be the closed two dimensional disk, f a continuous function D→D, x a point in D. (ofc D is compact and connected)

Where lim*(a_n) ={ limit of any convergent subsequences of a_n }.

Is it true that L = [ lim*_n f^(n)(x) ] can only have a finite amount of points?

Edit: Assume L is countable.

Hi are there any applications or interesting papers on topology, metric spaces and modern geometry on machine learning or AI? Can you link me some cool papers or interesting PDFs or anything cool to read/watch? Thank you.

So I'm trying to model the Wingman from Apex Legends. I'm doing it piece by piece so I can eventually 3D print each piece and put it all together.

But I'm unsure about my topology on a certain part.

Here is my model https://imgur.com/a/zH8AUP3

here is the reference image: https://imgur.com/a/X6cWpjp

The main concert I have is the couple of triangles I have along the diagonal line towards the front. Is there a better way I could do that part of the model?

Thanks.

Hi all, i want to draw the topology of an aws project, (draw.io) - The thing is, that i didn't create the projects by my self and i have to somehow "discover" them and visualise them. Any ideas how to do that?

(For example, if i had to do it in traditional cisco devices network i would start with commands like "show neighbors", read the interface description, do some "sh arp/mac table", ping/traceroute etc)

Thank you!

Hey Guys!

So interesting problem to have here - we just got our new building spun up, and it was actually cheaper to bundle in a 200/200 fiber line with all of our phone lines and TV - so - now I have a 200/200 fiber line that is in our building that I can't use because it's not in our main building.

So here is our layout: https://imgur.com/a/1NzlShf

Our main building, on the right side of the image, is where we have about 6 MS switches and an MX, with a single internet connection. From a MS220, we have a 1Gb direct connect fiber going about a mile over to our new location, where the new fiber is.

The 225 is doing routing for our new building.

Unfortunately, they only ran one fiber line back to the main building. Is there any way I could bring the new fiber internet, over to the MX to use for a primary/secondary connection?

JNCIE-SP and vMX

I'm looking at adapting a diy modular synth circuit, and would like to be able to digitally control some of the front panel controls. Most of the front panel switches have DPST or SDST, and not only pass signal (vs a control voltage) but also substantively change circuit topology.

Are signal-grade relays my only option for moving forward with their project? It seems like I should be able to simple amplifiers some times but that would change the internal impedance for the circuit, and substantively shift the frequency domain responses, in some cases. Is this correct?

I’ve taken metaphysics, and a few other philosophy classes, in my undergrad and I’m currently reading/informing myself on topology. A great example used in topology is that a donut and coffee cup are indistinguishable. This idea sounds really similar to what’s studied in metaphysics from what I read in class and I was wondering if there is any correlation between the two subjects? I think one example was how a statue at t1 turns into clay at t2 and trying to figure out if it’s the same thing. I see the similarities but if anyone else can provide some thoughts?

Hello,

What area of maths combines algebra, geometry, and topology? Also is research in Analysis that dead or less interesting all of a sudden? I spoke to someone saying that they would rather focus Analysis if they had lived in the 50s-70s, something like that. I actually do not mind Analysis (nothing against it as well), but there have been talks of it, having fewer opportunities? I would not know though. But somehow doing algebra feels much more stimulating to me than Analysis. So I feel I would want to go on the algebra route.

Anyways, I have a bit of a plan that goes like this:

• For my Masters, I'll plan to focus on Homological Algebra.

• For my Doctorate, I'll plan to focus on Topology/Geometry (also what areas from Homological Algebra could I apply to Top/Geo). I have read some stuff on Cohomology and it had kind of pique my interest.

Also your story of how you went about finding your area/field? And tell me why you love it?

I want to go on the Master's route and just so I could secure myself later as well. I know that some people go from undergrad to doing a Doctorate.

Thanks,

MuchCry