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Questions tagged [topology]

For questions about network topology, where a network topology is the arrangement of a network, including its nodes and connecting lines.

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Network discovery survey template? [on hold]

Does anyone know of a good template to fill out when gathering info for a major network overhaul/upgrade? Something that will gather info on the entire network topology on all layers down to end ...
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4answers
124 views

Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
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27 views

Question about subnetting [duplicate]

If i have a network 172.16.100.0 /22, How can i subnet in in order to have 2 networks of 32 IP addresses 5 networks of 64 IP addresses 3 networks of 128 IP addresses 1 networks of 256 IP ...
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1answer
45 views

How to change ip TTL=1 on flat network for security [closed]

Working on a network at an high rise apartment complex. They have a core router/firewall acting as dhcp server and about 7 switches (all l3 switches). They have a few vlans to segment traffic based of ...
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3answers
53 views

Using VRRP instead of XSTP

Suppose there is a ring with two routers (L3 switch) and 3 switches. All devices are configured properly.VRRP is configured on both routers and one virtual gateway is introduced to switches and their ...
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4answers
79 views

What happens if I connect several switches together in a loop?

Suppose I want to network a stadium and I have 20 switches connected in a loop. My goal is to be able to connect a laptop to any of the switches and connect to the network and limit my TTL going ...
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1answer
65 views

What is difference between “topology of network” and “geometry of network”?

In the Internet some times, we hear of the term "geometry of the network": https://bit.ly/2VqI2YO Is there any difference between the term of "geometry of the network" and "topology of the network"? ...
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0answers
55 views

Is this a valid OSPF topology?

In the following topology: every Backbone router is an ABR. Router 2 belongs to three different areas, area 0, area 1, and area 4. is this a valid topology for OSPF ? it works as expected and it ...
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1answer
57 views

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems? Please, refer to the attached drawing. What are the equivalent Cisco Switches ...
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1answer
19 views

ACL and ACEs Query

So i'm configuring a basic network and I need to create a couple of Extended ACLs. Now my question is, does this ACE permit any TCP connection to the following subnet? permit tcp 192.168.10.0 0.0.0....
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3answers
2k views

What does the “T” shape mean in network topology?

What does the "T" shape mean here? There is a logogram, but I want to know the RTA's left side port whether is config the 192.168.1.0/24 network segment's IP address. This is Quidway technology.
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1answer
137 views

Optimal network topology for diskless setup [closed]

I need advice on which of the following options would be best, plus their pros and cons. I already have an idea but I need expert opinions and experience to validate if these are even possible and if ...
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1answer
74 views

The number of nodes in a fat tree topology

To my knowledge from papers I have read, the number of pods is the main parameter used to determine the number of switches at each level along with the number of nodes. For instance, in each pod/k in ...
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0answers
31 views

encryption gateway vs domain and source ip issues [closed]

(This is the same setup as a previous question.) My VPN connection was no longer working (for ~4h), so I called the remote end's tech support. While we were talking, the link mysteriously started ...
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0answers
49 views

If cable (coaxial cable TV / cable internet access) is shared, what is preventing DOS attacks? [closed]

If I simply blasted a continuous signal, wouldn't I make the entire network unusable?How do users (modems) even know when they can send their data (is something like CSMA/CD used?)?I assume there's a ...
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1answer
488 views

What is a “back to back” firewall configuration?

I've found some guides talking about "back to back" (or back2back) configuration but I can't find an explanation of such configuration. Can somebody explain what is meant by "back-to-back"?
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1answer
190 views

Can bus and star topology be used simultaneously?

The problems asks if the first and fourth host are in the same subnet for the first picture. However, it seems quite different from pictures what I typically have seen (picture 2). So I conjectured ...
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2answers
143 views

Network topology discovery with Flows

I am trying to understand is it possible to discover Network topology with Flows. I know it is possible to do topology of SNMP ARP/*DP data but I am wondering maybe it is possible to get exact result ...
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1answer
78 views

Is Spine-Leaf Network Topology dedicated only for Wired Connectivity?

My Question is clear, so, is there an application of SL topology in wireless connectivity ? If not, are there other topologies similar to that, having the same performances but for wireless purposes ?...
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1answer
2k views

IPSec site-to-site with/without NAT

I am connecting my office to a client's network via IPSec. The need is for me to connect directly to internal IPs on their network; there is no need for them to connect to any services on my internal ...
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1answer
25 views

What is the frame size in result of collision in token ring? [closed]

I have on my studies one exercise and I don't know how to solve it. What is the size of frame in result of collsion in token ring, where length of link is L = 6km, number of stations n = 50 and speed ...
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1answer
2k views

Hub and spoke vs Star topology

I am studying for CCNA certificate and wanted to know the actual difference between Hub-and-spoke and Star topologies. Could somebody explain me this as it looks identical to me.
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2answers
456 views

Unbundling local loop

When we are dealing with local loop, we indicate the last mile of connection from the CABINET (or whatever else) to the subscriber. Now, I'm asking to you, the local loop is the medium of the access ...
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1answer
196 views

Is this a valid network diagram?

I'm studing how to create a network diagram to this problem The problem is: 7 condominiums with 7 floors each one, each floor has 4 apartments The project is needed to use VLANs, Routers, DHCP, DNS'...
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3answers
283 views

InterVLAN Routing Plan

My network currently has 7 VLANs (2 user, 1 voice, 1 server, 2 wireless, and 1 for our networked A/V equipment). All of our switches are layer 3 Cisco Catalysts. However, we currently have a router-on-...
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7answers
4k views

Cant ping & access HP switch on network connected on trunking mode

I have been facing this problem for a very long time. Here is a diagram of the switch situation: The problem is that I have been trying to access the switch on the RIGHT(A3100) through the network ...
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1answer
43 views

How will these frames be delivered to respective destination nodes? [closed]

I have the following 3 devices on my network(a bus topology): A,B,C Let MAC(i) - denote the MAC address of the device i. IP(i) - denote the IP address of the device i. The devices B and C happen ...
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1answer
5k views

How to configure VLANs with windows server 2016 DHCP in one VLAN [closed]

Here is an example of the network topology I am trying to create. There is the standard router - Netgear Genie. It can link each port to a VLAN, and the Wifi can be on the vlan, but my thought was to ...
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3answers
376 views

Need some advice with network topology

Hi Network Engineer experts out there, I need to refresh our network infrastructure since our network is not secure and not very structured. Right now, our network doesn't have VLANs, everything is ...
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2answers
628 views

How to connect one port to multiple devices?

I'm studying from Lammle book on routing and switching. The setup in the picture is in the book. how can I connect one port of a device to more than one device (as in the figure), and how can I ...
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1answer
37 views

International download speed problems [closed]

I have 2 servers in Singapore and Canada. Both pass local speed tests of ~100mbit/sec, but when transferring files between them, speeds can be as low as 20kb/sec. The Singapore server can still ...
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2answers
76 views

FibreChannel topology

I trying to understand SAN topology. If we have fabric and fabric mode with auto data rate is set == means we will get F_ports, right? And if we need use 8G link from SAN storage and no fibre mode ...
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1answer
58 views

How does information move on a topology bus network? [closed]

For exemple in AS-Interface there is the master who send information and then the slave send a response but in topology bus all systems are connected to one wire so the information will go to all ...
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1answer
243 views

How to configure VLAN?

I have simple tree topology network. I want to configure VLAN on this network, PFA the image. Am I wrong? Can VLANs actually be configured like this. I have setup this topology on mininet. More of ...
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1answer
343 views

Is this topology loop free?

I have the following topology: Topology I intend to build this network with the PC acting as a DHCP server and multiple IP-enabled custom development boards connected to the switch and some ...
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4answers
279 views

How the Internet speed on PCs can be almost 100Mbps although the bandwidth of WAN is 155Mbps?

I thought a bandwidth is a number represent maximum amount of traffic. But it seems not. Let me show the Network map in my company. In this image. WAN has a 155Mbps bandwidth and there are a lot of ...
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1answer
236 views

What are the number of adjacencies in 10 router in mesh topology and DR/BDR topology in OSPF? [closed]

FYI: this is not a homework question. I was reading an article (http://packetlife.net/blog/2008/jun/19/ospf-network-types/) in OSPF and couldn't understand this point. "a segment containing ten ...
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1answer
109 views

Overlay star network topology

I am trying to accommodate the following situation and am looking for guidance on whether the topology I am envisioning is possible, what are its implications and what else I should be thinking about. ...
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1answer
103 views

MAC Spoof frame delivery

in this topology, when I change MAC address on attacker NIC to PC2s MAC, where is running webserver, then ex. icmp attacker -> PC1, so in switch CAM is on Fa0/3 same MAC as on Fa0/2 I think so...? Now,...
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1answer
808 views

Need Help Drawing Topology in Packet Tracer

I am a first year Netacad student and I am having an issue with a word problem. The requirements for my network are as follows: I will be using packet tracer to design and simulate the network. 3 ...
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3answers
180 views

Cisco Icon for a datacenter?

This is my first time here. So, apologies if I get something wrong. I am trying to draw an inter-DC topology for which I want to use a Cisco icon for datacentre. Until now my search has been futile ...
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1answer
26 views

What is the N½ value of a network?

In the context of HPC interconnect networks (Infiniband, OmniPath, ...), I've come across the notion of the N½ value of the network, which is supposedly some performance number. What is this number? ...
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1answer
56 views

Windows Server Physical Connection [closed]

Im new here and just starting to learn about windows server, i'm very curious to know regarding the physical topology of a server based network (windows), lets say i want to install a complete ...
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2answers
467 views

What type of routing algorithm is typically used in the fat-tree topology?

I've read several artical about it, but can't seem to understand this. What sort of routing algorithm is typically used in the fat-tree topology?
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1answer
1k views

what is the industry standard meaning of “flat network”

I have typically known 'flat network' to be a non-vlan network, typically a single /24. We have a new hire (security analyst) at my company and he asked the desktop support supervisor if he had "...
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3answers
167 views

What are the NAT boxes for in the topogogy?

The full topology is on page 7 I do not understand why the NAT boxes are only connected to edge. Why not have links from core to edge carrying traffic without NAT and links from core to A10 then to ...