Network Architecture





Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

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Hi Experts,

we have to plan a big move to another building.
I have some questions about it.
Our datacenter is using RJ45 patch panels and cabling is done with CAT7

The new building has older technology installed and another patch system , called SYSTIMAX.
This SYSTIMAX patch system is new for all of us and the installed cables are all CAT6.

What kind of patch systems do you use in your datacenter ?
Do I have so many benefits with SYSTIMAX ?
Exploring SharePoint 2016
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Exploring SharePoint 2016

Explore SharePoint 2016, the web-based, collaborative platform that integrates with Microsoft Office to provide intranets, secure document management, and collaboration so you can develop your online and offline capabilities.

I have 1 aruba 2930F 48G 4SFP+, 2 24G POE+ 4SFP+ switches. How should I stack them?
I'm attempting to connect some switches in my IDF locations to my MDF switch via SFP.

The fiber connecting each IDF to the MDF is multimode, OM3. It connects to a LANscape housing in each location. From the housing, I'm trying to connect a fiber patch cable to the SPF module on the switch.

I managed to get ONE switch working in ONE IDF by using an aqua OM3 patch cable connected to a Ubiquiti module. The only way I could get that connection to work was with a multimode fiber converter in the MDF connected to a port on the switch. SPF would not work. I've tried various SFP modules, including an SPF+ 10G multimode, a Trendnet 1.25G multimode, a generic 1.25G multimode module, and even a couple single mode SFPs, just in case. I've tried aqua OM3 patch cables, orange OM1 patch cables, various LC to SC adapters, and some yellow single mode patch cables, again, just in case. I've tried just about every single combination of the above in some fashion.

On a second switch in a second IDF, even with a fiber converter in the MDF, I can't get a link. If I remove the converter from the first connection in the first IDF, I can't get a link with any combination of the above.

I am about to go insane with this problem. This should be straightforward and easy, but it's driving me nuts.

The contractor installing the actual fiber backbone has told me it's multimode fiber, OM3, 50 microns. I suppose that might be incorrect information, but I have had no issues or inconsistencies …
We are expanding our office so will need to install an additional switch in another room c20 feet away from the comms.  At the same time we are looking at replacing our existing switches.  

Currently have a hp 2910al poe+ 48 port serving as GW for hosts.  It routes to the local firewall and thereafter out tot he web via router.  We run two vlans for data and voice.  
We also have two other switches connected via ports on the 2910al.  These are HPv170 and 3com 2952, these run only data, no voice.

Looking for recommendations for specs and types of switches.  We like HP but would use any other.  Ideally have some form of resiliency and HA in the comms room and the same with the other switch in the other room.

Would modules be any good?

We also have STP disabled for our voice to work.

We have purchase the new Aruba 2530F and our HQ instruct us to create the SVI’s in the switch and perform the intervlan on this switch. I have some doubt regrading this configuration and hope that expert can advise me.
1.      For all the printer we should use which vlans
2.      From the switch I can see that have option for us to check primary and management in vlan interface, let said in this information provide by HQ should I enable “management” in  VLANS 4
3.      What is native VLANS
4.      We try to enable the management in VLANS 4 ,we lost access or web console but we still have connectivity ?
5.     we should connect all the configure all the management port in VLANS 4 ?


as attach file show, I have two firewalls, one is too old and could not support VRRP, but I want to make a backup route.

so I write two default route on Core switch:
ip route
ip route

I don't know if there will be problems.

if is broken, the traffic will through

help with setting up VLAN on a few switches for phone and data equipment.

i have a series of managed switches that are uplinked together.  I would like to set up a VLAN 100 for a dedicated router that is on port 48 of one switch. This router will listen to requests from phones that are plugged into any other random ports on the switch.  This switch is a ubiquiti unit that allows me to set port 48 to listen to vlan 100 traffic only.

The phones are set to 802.1Q with a vlan of 100.  there are other computers and servers on the switch that are on a 192.168.0.x subnet.  The server is handing out DHCP as well as the router on port 48.  The idea is to isolate the traffic for the phones to ONLY communicate with the DHCP server on port 48.  

Right now, this setting is working. However my question to you, is since the phones are all plugged into random ports 1-47 and set to vlan100  and these ports are set to listen to both default lan traffic as well as i simply congesting the switch with added default and vlan traffic vs setting the actual ports that the phones are plugged into to ONLY vlan 100?

Also, if i plug in another switch,, do i need to set the uplink from one switch to another switch with a vlan100 for them to comminicate or will they pass the phones traffic that is tagged 802.1Q VLAN 100 traffic to the other where the port 48 will ultimately listen and grab it? Thank you!

I have a Cisco network running 10/100/1000Mbps. Should I planning on upgrading it to 10Gbps, 40 Gbps, or 100Gbps? What would be involved? New switches, cabling? I would appreciate input from anyone who's also doing the same or planning on doing the same. I would like to know what devices, cables etc you are thinking of, your plan of attack and approximate costs.

Thank you so much in advance.
How to combine two subnets?
AM  Volunteer IT for church.  Have one wired network, one server (W12 running DHCP) on 192.168.0 subnet mask with printer/copiers wired workstations connected thru POE switches to Zxyel Firewall/switch to Comcast.  File sharing and SQL databases on server.  Zyxel also splits off to VIOP phone system. Originally had some Dlink routers acting as Access points for wireless (worked, but campus not fully covered).

Independently, another volunteer got approval to purchase campus wide wireless.  Third party installed Ruckus wireless POE units (10, one a controller) on subnet 10.59.0 subnet mask running separate DHCP for wireless side (one workstation is also connected to this subnet).  All Dlink routers were removed. Supposedly inherent to the Ruckus system is health checking and repair/restoration of the Ruckus access points without human intervention.  I have no manuals or training on the Ruckus wireless system.

Needless to say, workstations (wired or wireless) on one subnet cannot see across the subnets. i.e. file explorer does not show machines on other subnet and visa versa.  Found that if I enabled WINS on the 10.59.0 systems, I could then address the server by manually entering servername i.e. \\servername\sharename.  Believe there are issues of getting to SQL databased from a wireless workstation as this week had to connect a wireless laptop via ethernet to setup an application using a SQL database.  There was a…
How can you prevent a malicious actor from repeatedly locking your AD account simply by entering a wrong password three times on the company VPN webpage?
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The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

We have total 7 scope configured in DHCP out of which 3 is showing blue exclamatory mark, when I click on display statistics for these 3 scopes all value is showing zero only. Event logs showing error messages like "DHCP client request from C42F909FAB66 was dropped since the applicable IP address ranges in scope/superscope VLAN40 are out of available IP addresses. This could be because of IP address ranges of a policy being out of available IP addresses." for all these 3 scopes only. However all these scopes are not more that 50% occupied.

DHCP lease is 10 hours for all scopes except scope for mobile user.

In DHCP properties DNS Tab
""Dynamically update DNS record only if requested by the DHCP clients"" is checked.
""Discard A and PTR records when lease is deleted"" is also checked.

Assign IP addresses dynamically to clients of: is DHCP

In DNS Scavenge stale resource records are set as No-refresh interval 3 days and Refresh interval 4 days for all the zones and scavenging Period is 1 Day.

I performed the reconciliation and restarted the DHCP services in both DC and is ADC. Also I checked by restarting our ADC as it was also showing the same thing but it also doesn't work however I have not cheeked  by restarting our DC yet.

Please suggest if anyone having the solution for this.
Can you recommend an ISP for our small remote Sales office at New York City? We need 10-20M bandwidth with a backup line. The ideal ISP can provide a separate backup line -- meaning once the main line is failed the WAN connection would switch straight over to this backup line. And the backup line is included in the cost of main line.
How to restore back the delete shared Mallbox by powershell.

I would like to know if it is possible to effectively use voip with private vlan edges, and how.

I have private vlan edges configured, essentially with the switchport protected, switchport block unicast and switchport block multicast, on all my user's workstation ports on the distribution switches. This is to prevent lateral movement in case of compromise. I would like to configure the ports for VoIP in the usual chained jack-to-phone-to-computer format. These catalyst switches are connected to the core catalyst switch via fiber.

I understand that all traffic on a switchport protected interface will be sent to the uplink and that this includes all voice and data traffic from that particular interface. But, I would prefer not to have to disable protected ports to allow phone to phone voice traffic.

Please help.
I'm working with a customer who has a camera system and it's configured for remote viewing. Unfortunately, this is causing the customer (a retail store) to fail their PCI compliance scan due to open ports.

My suggestion was to purchase a second static IP from their WAN vendor (Verizon FiOS) and use 2 routers: one for their POS system (an existing SonicWall) and a new router for their WiFi and camera access. So the system would look like this:

Verizon FiOS ONT Box
HP 1810-8g Switch
SonicWall Netgear

The problem is that when I connect the SonicWall through the HP switch, the WAN port won't connect. When I set a laptop to the same static IP and plug in it to the same switch port on the HP, it connects fine and is able to pass data. As soon as I connect the SonicWall directly to the FiOS ONT, it works fine.

Here are a few more specifics:

SonicWall MTU: 1492
HP MTU: Default (1500?)
HP Switch: No VLANs set; LLDP disabled; jumbo frames off; port mirroring off; flow control off; green features off; loop protection off; advanced security off; no trunks configured; management port set to Port 8 on an unused subnet

Any help would be great. Thanks.

Can you please advise why IP of server is changing like

Pinging with 32 bytes of data:
Reply from Destination host unreachable.
Reply from Destination host unreachable.

Open in new window

Multiple sites need to share data with file locking.  (this rules out DFS)
We currently use Globalscape WAFS, but the product is EOL.

I am looking for a solution to mirror my data in near real time (depends on speed of wan links) and maintain file locks remotely.
Ideally, the solution would NOT use SMB for data transfers as the chatty protocol doesn't do well on our 30ms latency wan links.
We currently have two Nexus 93180YC-EX and two Nexus N2K-C2248TP-E-1GE in our environment. From all the articles that I've read so far, the Nexus 9K will only support topology 1, but doesn't support topology 2 (see attachments), is that correct? Any input will be greatly appreciated.
Dear Experts, I'm testing this network diagram with EVE-NG

Without the NAT translation and access-list, all 3 VLAN PCs can ping to, SLA also work OK to switch from default route to backup route.

With the NAT and access-list, PCs from VLAN11 and 12 could not ping although I allowed icmp on R1's interface. The PC on VLAN13 (not it NAT and access-list still could ping to How can I fix it with NAT and access-list?

I attached the configuration files.
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Exploring ASP.NET Core: Fundamentals

Learn to build web apps and services, IoT apps, and mobile backends by covering the fundamentals of ASP.NET Core and  exploring the core foundations for app libraries.


I would like to route my voice traffic via separate IPVPN  link to the edge switch from my core switch.

What would the best strategy ?

As you can see from the attached diagram, site2 communicates with site1 via the pt-to-pt link as the primary. The MPLS is the backup link.

To get to the public server, site2 is going through site1. core1 redistribute static via EIGRP. and site2 learns the DG via EIGRP.

What I'd like to do is to reroute the DG  of site2 to FW2 when or fails. How would I go by accomplish this? Thanks

configuring vlans on HP 5406zl
I'd appreciate some advice on configuring a data and voice vlan on a HP 5406zl, the current config is attached.
currently the whole switch is configured on the default vlan, however I want to add a voice vlan for a up coming voip phone system replacing the old analogue pabx.
the goal is to connect the pc's through the phones, phones on Vlan30 and Data on Vlan1.
I have added the vlan30 , however in need of some advice on the tagging and untagging of ports and the routing to enable the vlans to communicate with each other.
this switch also acts as the core switch and has IP routing enabled, it has 6 poe modules (ports A1- F24)
A1 to F22require both vlans , F23/F24 will be used to connect to switches on another floor and need to pass both vlans through. F17 is the link to the FW
appreciate some guidance on this as HP is not mother tongue, when switching.
The goal is to connect the Main & Seed Office That have a city street and a railroad between them.  via the point to point wireless to be able to share the higher speed
Of the Charter cable along with giving the Seed office access to the NAS.
But I need to have a failsafe if the wireless goes down for any reason that the Main office
Would not lose their internet connection all together. Just fall back to the 10 m Fiber
What do you think the best route would be for this setup.
Running  any cable from the feed mill to the seed office is not an option with the railroad tracks
And a city street in the way.
Thanks in advance.
Hi all, looking for some assistance with a SQL cluster issue, would appreciate any assistance available.
xxxSQL07 is the name of the SQL cluster (windows cluster name xxxSQLCLU02) made up of two nodes; xxxsql03 and xxxsql04.
All works, able to connect using SQL studio using Windows Authentication (tried multiple accounts, including the service account that all SQL runs on on this domain).
The problem has presented itself as we've recently created a reporting server (xxxrpt02). The local publication has been configured linking to the only database on xxxSQL07 and wizard completed with no errors. From SQL studio on xxxRPT02, when trying to add a local subscription I receive the error message, "The target principle name is incorrect. Cannot generate SSPI context. (Microsoft SQL Server)". I've tested the reporting server by connecting to a local subscription on another SQL cluster which works, I also tested the faulty domain cluster from the other working reporting server and received the same error.
This error occurs whenever I try to connect SQL studio to this SQL cluster. I've also tried connecting to the name of the windows cluster but that didn't work.
In an attempt to fix this issue I took the xxxSQLCLU02 offline from failover manager and performed a repair in an attempt to get this connecting in to Active Directory correctly.
The SQL cluster name is pinging and the IP is resolving when pinging -a.

I've done some digging around and am erring toward this issue being…
I have 3 WS-C3550-48-SMI and they are connected to each other via 1000BaseCX Gigastack. But they are only half-duplex. My users are experiencing slow response. Could it be because of those trunks with half-duplex?

sh int status
Port      Name                      Status           Vlan       Duplex      Speed      Type
Gi0/1     Switch A & C       connected    trunk      a-half        a-1000      1000BaseCX Gigastack

Network Architecture





Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.