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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Can't access floodlight controller's GUI [closed]

Hi everyone im using Ubuntu 16 installed floodlight the combilation build works fine also the floodlight.jar and i created a simple topology with mininet using floodlight's port. The problem is i can'...
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2answers
61 views

what is the main function of root bridge and ring master?

When we learn the STP or RSTP,we all learn the election of root bridge, the lowest priority number or MAC address of switch will become the root bridge.So here is my first question: 1.So what can the ...
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1answer
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Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
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46 views

If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology,combined with 8 Hubs and 2 switches,i want to ask two questions 1. If H3 is damage,but the fiber is still ok,will H2 damage too in the future? i have a thinking to ...
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2answers
90 views

The difference between data frame and BPDU in STP

There are two of port states in STP: Disabled and Blocking,and the a website explain their difference Disabled : This port is shutdown,and it won't send or receive any frame Blocking : This port won't ...
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6answers
148 views

Why does STP choose the lowest bridge ID as the root bridge?

The switch which has the lowest bridge ID can be the root bridge,and the bridge ID is made of priority and MAC address,that is , bridge ID = priority + MAC address So we will choose the switch which ...
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1answer
25 views

Does a receiver send acknowledgements after data received/failed in a bus topology and in ring topology? If so, how?

if in a bus or ring topology, is there any acknowledgement or error mechanism that if a packet is sent/or failed to receive/lost.
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2answers
225 views

Network topology with big spanning tree diameter

I have a quite big network with spanning tree diameter 26 (if I count it correctly). It is build on Cisco swithes (mainly Catalyst 2960 and Catalyst 1000, two SG350), running rapid-pvst. It is now ...
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2answers
420 views

EIGRP route redundancy in a ring topology

Within GNS3, I am attempting to configure five Cisco 3660 routers in a ring topology with EIGRP, as an early exercise to try and learn how to use EIGRP: These routers and virtual PCs are configured ...
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4answers
1k views

Firewall placement

Most diagrams I come across are as follows: ISP > router > firewall However, wouldn't you want a firewall before the router to protect the router? E.g ISP > firewall > router
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1answer
25 views

Communicating a large number of devices via modbus

I want to use serial modbus. (Modbus RTU or ASCII) but I want to communicate with 400 device with modbus rtu. How is this possible?
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2answers
716 views

Fat-Tree topology

Fat tree network topology looks like a tree topology like below figure. In tree topology, we have same terminologies like Root, parent, child etc. This is mainly used to connect a large number of ...
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4answers
1k views

Will IP cameras increase the traffic in our local network?

We need to place 16 IP cameras (4MP) to monitor a warehouse, where all these cameras will be handled by a CCTV. We have 2 options: Connect these cameras through the same cables under the same switch ...
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127 views

pinging with iperf vs without iperf

I am running a basic point to point topology on mininet. If I do h2 ping h1, I get such rtt values: rtt min/avg/max/mdev = 0.028/0.067/0.129/0.022 ms But when I ping while the iperf is measuring, my ...
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1answer
258 views

Why is this subnet config required by my vlan "snake topology"?

I must validate the bandwidth on all 8 ports of a switch. We intend to do this with a "snake" topology as described in this article: http://thenetworksherpa.com/test-throughput-alchemy-using-a-snake-...
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1answer
27 views

Connectivity problems in a topology [closed]

I cannot identify any network problems in the following topology. https://i.imgur.com/eyUEzvz.jpg Any help in identifying problems would be appreciated, and I would be happy to work on them.
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3answers
761 views

MSTP Ring - Maximum Number Of Switches?

We have inherited a ring topology with 12 switches configured with MSTP. Each switch is either 4 or 8 ports but in general most are 4 port with 2 fiber uplinks that form the ring. We are getting a ...
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5answers
4k 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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1answer
146 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
234 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
730 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
153 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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1answer
291 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
2k 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
30 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
283 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
364 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
41 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
83 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
2k 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
523 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
164 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
85 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
3k 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
28 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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2answers
4k 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
487 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
558 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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4answers
506 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
10k 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
44 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
11k 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
1k 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
2k 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
42 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
131 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
86 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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2answers
405 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
716 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 ...