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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should I go multiple switch or one big switch

So I have a 2.5Gbps NIC on my server PC, but my main questions are: note: I'm using consumer grade switches will a 2.5Gbps switch split the load with two 1 Gbps switch? will the 1Gbps be better on ...
randomaire's user avatar
-1 votes
2 answers
120 views

Why is inter-VLAN communication not working in my network set-up in Cisco Packet Tracer?

I have created a simple bus topology connecting 2 switches and a router, with each switch connected to their respective end devices through ordinary star topology. The switch model used was 3560-24PS ...
Trineshen's user avatar
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1 answer
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Is a Token Ring network a bus?

[This is a question I have realised has been bugging me since I had to learn about Token Rings, 30-odd years ago. I clearly have a wrong understanding here, but I never managed to figure it out.] I ...
Oddthinking's user avatar
2 votes
1 answer
906 views

Setting up a pfsense router between two private subnetworks

I have a situation like in the picture: I want to add a pfsense router inside an existing 192.168.1.0/24 subnet and have these possibilities: I want the 192.168.73.0/24 network to have access to the ...
Janjko's user avatar
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Is is possible to create a network using supernetting like this? [duplicate]

I need to create a network in the range 200.1.x.x and split it into 3 LANs which consist of 1250, 1750, and 1500 hosts respectively. This network should be able to expand to a total of 56 networks. ...
Tina's user avatar
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1 answer
346 views

Hot potato routing topology

Im trying understand hot-potato routing better using this diagram that I have made. It shows R1 and R2 in automous system 1 (AS1) are receiving full routes from their parent providers P1 and P2 ...
john genjis's user avatar
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1 answer
389 views

What are the stages in a 5-stage clos network?

A 3-stage clos topology makes sense to me. You have servers->leaves->spines. However you see at the bottom of that same page it has a "Clos three-tier network with superspines". That ...
Grant Curell's user avatar
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2 answers
90 views

Which access methods and topologies are used for 10/40/100 Giga Ethernet?

So I'm learning about different Ethernet types and it's stated that the Standard Ethernet operates at Bus/Star and uses CSMA/CD as an access method. The same is stated for Fast Ethernet and Giga ...
April Crude's user avatar
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2 answers
473 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 ...
user16266657's user avatar
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233 views

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 ...
user16266657's user avatar
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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 damaged,but the fiber is still ok, will H2 damage too in the future? i have thinking to ...
user16266657's user avatar
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2 answers
484 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 ...
user16266657's user avatar
4 votes
6 answers
1k 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 ...
user16266657's user avatar
1 vote
1 answer
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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.
Allan's user avatar
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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 ...
Pesand's user avatar
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1 vote
2 answers
1k 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 ...
toxicantidote's user avatar
2 votes
4 answers
6k 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
The_Bear's user avatar
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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?
gogogo's user avatar
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2 answers
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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 ...
guidev's user avatar
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3 votes
4 answers
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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 ...
yaylitzis's user avatar
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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 ...
a125's user avatar
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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-...
CLSheppard's user avatar
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1 answer
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Connectivity problems in a topology [closed]

I cannot identify any network problems in the following topology. https://i.stack.imgur.com/2ae2e.jpg Any help in identifying problems would be appreciated, and I would be happy to work on them.
ayy lmao Swookie Games's user avatar
1 vote
3 answers
1k 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 ...
Aidan Venn's user avatar
1 vote
5 answers
8k 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?
m.Robot's user avatar
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1 answer
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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 ...
ITWeasel's user avatar
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3 answers
386 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 ...
A.A's user avatar
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2 votes
4 answers
2k 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 ...
SweetPoontang's user avatar
1 vote
1 answer
190 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"? ...
Questioner's user avatar
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1 answer
637 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 ...
Forrest's user avatar
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1 answer
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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 ...
jose76's user avatar
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1 answer
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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....
user avatar
4 votes
3 answers
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.
244boy's user avatar
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1 vote
1 answer
367 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 ...
Krauxe's user avatar
  • 111
0 votes
1 answer
601 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 ...
KaySay2018's user avatar
2 votes
0 answers
62 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 ...
r2evans's user avatar
  • 153
1 vote
0 answers
90 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 ...
JoeDough's user avatar
1 vote
1 answer
3k 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"?
sgargel's user avatar
  • 113
1 vote
1 answer
699 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 ...
Riddle Aaron's user avatar
1 vote
2 answers
181 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 ...
Gen's user avatar
  • 113
1 vote
1 answer
94 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 ?...
David29's user avatar
  • 13
3 votes
1 answer
4k 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 ...
r2evans's user avatar
  • 153
0 votes
1 answer
31 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 ...
bolo's user avatar
  • 1
3 votes
2 answers
8k 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.
Tadas's user avatar
  • 31
4 votes
2 answers
514 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 ...
rollotommasi's user avatar
0 votes
1 answer
885 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'...
Rodrigo João Bertotti's user avatar
0 votes
4 answers
564 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-...
Josh Friedman's user avatar
3 votes
7 answers
12k 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 ...
FreezY's user avatar
  • 91
0 votes
1 answer
48 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 ...
Dipunj's user avatar
  • 13
1 vote
1 answer
12k 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 ...
Simon's user avatar
  • 111