Switches / Hubs




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A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

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Hello all,
    We finally got a fiber connection and MPLS setup at our other office and I am working on configuration of the hardware to send up there, but had a few concerns. At my office we have 2 …

What Should I Do With This Threat Intelligence?

Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

Unfortunately, many of our office ports are not labeled.

We have 5 Cisco Catalyst switches in the server room.

I need to be able to use the IP Address or Computer Name for a PC or laptop and det…


I am running iptables on Centos and want them to count all traffic on other device, so I have mirrored ports between the Centos and the device.
I can dump all traffic with tcpdump but the counters on…


Let s say  I have 10  Layer 2 Switches with 2 VLans on each switch, then connect those 10 Switches to a Core/Distribution Layer 3 Switch.  Then Route all Vlans from Core Switch to Router R1

If I a…


I have 10 layer 3 switches including a Catalyst 6500 connecting as a ring topology. It is currently at layer 2 (except the 6500) and I am planning to make it all layer 3 to avoid the RSTP distance lim…


I have 10 buildings and they are connected via fiber in a ring topology. It is currently layer 2 with the core at one building doing the routing. I am in the process of implementing EIGRP between the …


I would like to know if :
- I configure, for instance, one L3 switch port in Vlan 10, then configure the same port as Interface Vlan 10 , and assign it IP address.
-I just configure the Port wit…


In the scenario where VMs are in the same Vswitch but in different Vlans, when they communicate between each other, does the traffic go out to the Router then back to another VM ?

Thank you


Management Interface of ESXi Host
in the scenario where I have 2 physical Network Adapters on the ESXi host.
I will go to DCUI and assign Ip address to ESXi Host.Then I will team up bot…


Hi We are transferring ios from a server to router. The server ip address is My PC is and the router is Three devices can ping each other. Question is the tftpd64 so…

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
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I am trying to figure out this Arista Switches i am trying to make an MLAG configuration and i keep getting Inconsistent in the peer-config line. any ideas how to fix this.


One of client site has stacked two Cisco c3750, admin try to change password as follows;

DC-CSW#configure t
SDC-CSW#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z…


I'm building a parallel network for a migration, and I'm needing a like-for-like build for my two distribution switches (4506-E's with Sup 8-E's).  I have two spare 4506-E chassis that I'll use, but I…


I have a Cisco C3750X switch that seems to have lost its boot IOS configuration and just boots to the prompt SWITCH >
How do I install the IOS once I download it from the Cisco Website?  The IOS vers…


Management Network Interface in CIsco L2 Switch
If I understand in Cisco L3 Switch, you can configure an IP address on the SVI (Virtual Interface), and you can use it to access the switch remotely an…


We have a small 5 port GB switch between our LAN and phone system. My phone tech did some troubleshooting on an issue we were having the other day, when I asked him if he can see anything else that I …


This is all theory as I haven't got a router to test.
Looking at the attached /embedded drawing, PC1 needs to talk to PC2.
Switch 1 has ports 2-23 configured for Switchport mode access, ports 1 …


Morning Experts,

I have a requirement to create a CCTV installation
The project consists of two remote locations and one central server room (see attached).
At each site will be a PoE swtich to p…


Experts.. i'm having a brain freeze and don't understand why some of my eth connected desktops are getting the default gw of a LAN wifi i setup, same network, rather than our the LAN GW.  The wifi- is…

Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

I inherited an account of a small properties management company with 20 users and 20 various PC Workstations running Windows XP to Windows 7.  This account has been running on TWO switches:
> HP ProC…


I am replacing a Catalyst 3560X with stacked 2960X's, I am not a Cisco/Network guy - I am trying to replicate the existing config as much as possible.
On the existing switch a typical interface look…


I have replaced HP Procurve Switches (ProVision for CLI) with HP A5500 Switches (Comware for CLI).  

I've got all the manuals, but need to get a switch up and running quickly - faster than it seems…


can i connect a poe switch to a non poe switch to an access point and have the power get to the access point?


Dear experts, I will be placing 2 wireless Cisco 1831 AP in my network. It's a simple network with an ASA and a Cisco 2960 switch. I intend to assign an interface in the ASA for wireless network. My A…


I have a question about the following configuration that was previously configured and hoping someone could help to give me some idea why the switch (C3750X) was not configured interface Valn1 with an…

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