Questions tagged [network-core]

One of the three layers of network design. The main characteristics of the network core are that is should be highly redundant and high performance. As such, it is often one of the simpler layers in that it should not implement any services that impact performance. No user/server connections should be made to a pure network core.

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1answer
68 views

Static and dynamic routing related query

Two different paths to the same network are present in the routing table: one entered statically: and the other learned through dynamic routing protocol. When forwarding a packet to that network, ...
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1answer
6k views

2960s and outdiscards

I have an issue with a pair of 2960s switches. I can see a lot of outdiscards on some of the interfaces and the end users are noticing network issues. I also have some access points that can't ...
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3answers
11k views

Difference between CBR and FTP

I am new to networking. I have some confusions regarding CBR and FTP? Are they any protocols like TCP or UDP or something else? When do we use them?
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2answers
9k views

Connecting clients to two networks using Mikrotik router [closed]

I have two networks Network 1 and Network 2 shown in the picture, and one client machine that must access resources on both networks. Due to security reasons the two networks must be isolated from ...
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1answer
2k views

Quagga not announcing external routes over ibgp session

I have a problem when I try to achieve load sharing with bgp. My scenario is http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#conf3. Only difference to this is ...
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1answer
117 views

Network Routing and what makes network loop free [closed]

I came across this question and I have no clue how to prove. Any help would be appreciated. Q) Prove that a shortest path across a graph is loop free
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2answers
2k views

In MPLS VPN, Which one become first? MPLS Label tag or VPN encapsulation?

In MPLS VPN network, which one is the first thing to do? I mean label tagging is first or VPN encapsulation is first? If you can, please explain about this case.
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2answers
977 views

Can NIC be a bottleneck? [closed]

Assume we have an infinitely powerful CPU, and super fast IO communication with RAM and harddisk. On this powerful host, I have a server program which does two things - accepts files from the user and ...
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2answers
147 views

Why don't we send fragmented packets over multiple cables simultaneously?

I came up with this idea of using more than LAN cable for transmitting data. Suppose we have 6 wires running between two clients, we can divide the each packet into 4 equal parts (2 for error ...
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1answer
343 views

H323 Gateway configuration

I configured a Cisco H323 Gateway between 2 CUCMs connected via Intercluster trunk(non-gatekeeper controlled) Dial peer configuration is : dial-peer voice 10001 voip destination-pattern 3971... ...
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2answers
30k views

How to calculate sample RTT? [closed]

I am new to networking and figuring out that how to calculate sample RTT which will be used later to calculate estimated RTT, Here's my assigned problem: Suppose that TCP's current estimated values ...
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2answers
176 views

Circuit-Switched Network

What happens to data being sent into a circuit-switched network when the incoming data rate exceeds the bandwidth of the network?
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54 views

Remote Desktop is not geting through Wi-Fi [closed]

I had a network which is accessible through LAN and Wi-Fi but the problem is while using Wi-Fi we can't ping to any PC, and that's why we can't remotely connect to any PC. As Wi-Fi and LAN are on the ...
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3answers
5k views

MTU vs MSS? When to change MTU and when to change MSS?

Here is the question. When and Why do we decrease MSS instead of MTU. In the router that we can configure can configure both of them separately. Suppose I have kept MSS as 1260.I have not made any ...
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2answers
217 views

how to AS geographically apart are connected physically?

I am new to computer networking. One very simple question that comes to my mind is how two AS - geographically apart are connected with each other. For example, If I see the http://lg.bt.net/ BT ...
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0answers
70 views

How to proceed for research on Network security? [closed]

It may out of scope but I have to research on Network security. I have worked on Signal Processing in Time-Frequency down during Post Graduation research and have few publication. Now my interest ...
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2answers
2k views

Moving to VLANs from 2 LANS

I asked this question a few weeks ago: Moving to vlans from a basic network I think the advice the answerer gave was right but I think I want to move forward with segregating my network and trying to ...
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1answer
78 views

Is NS2 coding will be helpful in NS3

I'm taking Lab on Modeling and Simulation this Semester. My instructor is teaching us NS2. I searched online and found there is already new version of NS2 called NS3. If I learn NS2 then would it help ...
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2answers
525 views

Is publishing iBGP default routes a good idea in a multi-router multi-homed environment?

I'm looking at a network with two independent core routers, each with a different sized uplink, one 50mbps and the other 100mbps to a different ISP. I'm trying to get redundancy as well as load ...
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2answers
607 views

what is a Network Architecture [closed]

what is the exact difference between network architecture and network design? can I call the whole company network design as a network architecture.? why network architecture needed?
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1answer
275 views

Is only user plane traffic going through 3GDT in UMTS/HSPA network

If we have mobile network with working 3GDT then a big part of the 3G data traffic goes through the direct tunnel. This is for offloading the SGSN. Iu RNC-------------SGSN | |...
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1answer
87 views

Routing between several nets

I have 4 IDFs(cisco 3560) and one MDF(cisco 3560). IDFs are connected via fa0/24 to MDF. Every fa0/24 is in mode trunk. Look at the picture Fa0/1-4 on MDF is in mode trunk. Problem : I cannot ...
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1answer
2k views

Should I use the same Native VLAN for the management traffic network-wide?

I have the native VLAN on my trunk links set to VLAN 10 which is my management VLAN that spans the entire network. We have one WLC and Access Points connected on a trunk link set to native VLAN20 ...
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1answer
931 views

Distributed Trunking With core and Access Swtiches?

Is it possible to set up a Distributed Trunk with 2 Core an 1 Acces Switch on HP 5406zl? I know that you can connect two switches with an interswitchconnect port. That would be the 2 core switches. ...
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1answer
204 views

LTE EPC Synchronization between redundant components

I am investigating resiliency in LTE Evolved Packet Core. Each EPC components has information storage as defined for each user in 3GPP TS 23.40 (Ch 5.7). In case of failure this info needs to be ...
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2answers
2k views

Cisco Nexus 9000 core + FEX or ToR switches? [closed]

So I currently have two racks where I need a bunch of 10GbE ports (currently using SFP+ TwinAx cables), and I want to replace my current switch. Basically there are three options I could do: 1x9504 ...
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2answers
193 views

Help with BGP configuration

Consider this network diagram Routers A and B belong to the same AS Networks 10.0.10.0/24 and 10.0.20.0/24 are routable via AS200 and AS300 Network 10.0.10.0/24 is accessible via Router A and pass ...
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1answer
486 views

Is this the core layer?

I am new to networking and currently I have been learning about three layer model from Cisco. All sources say that Core layer is the one providing high speed switching and it is at the top of the ...
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1answer
174 views

Network Transport Connection

I am working with some colleges in another geographical location on connecting two satellite locations to a co-location facility. We are going to be moving all our server infrastructure to the co-...
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1answer
1k views

Label Distribution Protocol(LDP) in MPLS

I have been going through the MPLS technology recently.I have this doubt in my mind after reading some of the features of the MPLS. A---B---c | | D----E Lets say routers A,E are LER and B,...
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1answer
547 views

Need information on MPLS-TP, BHH & BFD

I am not able to find information on BHH; I got this link to draft-bhh-04 but was not able to understand the operation/function of BHH. If you guys have any info on above topics please let me know.
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1answer
119 views

NBMA neighbor-ship process

Could someone explain what is NBMA neighbor-ship process in OSPF? I have gone through several books but did't get satisfactory explanation.

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