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Questions tagged [switching]

For questions related to traffic switching and troubleshooting the traffic switching process.

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28 views

what are some Organization that got hacked because of WEP protocol? [on hold]

I wanted to do some research on WEP protocol and i wanted to know some organizations that were hacked just because of this vulnerability.
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1answer
33 views

Mac Address Flapping and switches

Is mac address flapping the reason why switches don't exchange switching information just like routers exchange routing information?
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0answers
90 views

why don't switches share MAC table information? [closed]

plz I want answer I do not know how to answer this question anyone one know the answer .should I write the working of switching and mac table?
3
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1answer
92 views

Inter-VLAN Routing Issue

As you can see in below diagram regarding the Inter-VLAN between Server (VLAN 107) with The site in (VLAN 104)actually, we can ping all the inter-VLAN on the site. but we cannot browse some of them ...
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0answers
18 views

DTP On Trunk Ports [duplicate]

When Statically Configuring a Port As Access, DTP Will Be Automatically Disabled. So Why Is It When Statically Configuring a Port As Trunk, DTP Will Still Be Enabled?
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0answers
29 views

Is it possible to use FDM and TDM at the same time?

I'm learning about FDM and TDM. And I got the idea that we can use frequency division and time division at the same time, i.e. using TDM for each frequency band. Is it possible? It seems certainly ...
4
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1answer
594 views

MAC Address learning process

Does a switch learns hosts mac address in these following scenarios: Switch port configured as access and frames received tagged on different VLAN Switch port configured as trunk and frames received ...
0
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0answers
25 views

Spanning tree priority values on port-channel

Group Port-channel Protocol Ports ------------------------------------------------------------------------- 1 Po1(U) LACP Gi0/3(P),Gi0/9(P) 4 Po4(U) LACP ...
2
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2answers
218 views

Spanning tree Priority values

show spanning-tree interface gigabitethernet 0/2 Switch default Instance Role State Cost Prio type -------- ---- ----- ---- ---- ---- MST00 ...
0
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1answer
37 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 ...
0
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2answers
35 views

Confused between packet switching and circuit switching

I am a bit confused between packet switching and circuit switching usage in telephones. If there is a loss of packet in packet switching or the packets may arrive in different order why is it still ...
2
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1answer
55 views

Is FDM and TDM only used in circuit switched networks?

I get the idea that TDM and FDM can be used in circuit switched networks, but what about packet switch ones? Can FDM be used?
0
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1answer
36 views

Tracking the packet flow thru a LAN

We are using a private 10.0.0.0/8 network for the management and other local traffic (storage) in our LAN as shown in the symbolic layout here: 10.0.0.1 10.0.0.2 Gateway ...
4
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1answer
122 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
4
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2answers
264 views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
1
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1answer
64 views

Networking Questions (Routing and Switching)

I inherited a haphazard network that I'm in the process of cleaning up and modernizing. Here is a synopsis of the current issue: We have a MySQL DB hosted on a Windows 7 PC (solely used to host the ...
2
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1answer
55 views

Routing and Switching & network monitoring

hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
2
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1answer
40 views

Two channels between two switches

Is there a way to provide two physically diverse channels between two switches? I'm using two Cisco Catalysis 3560s, and I want to have two separate channels between them, with different access ...
3
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1answer
50 views

Cascading a switch interface to another switch

We have a service provider switch which has an interface that we use to connect to other users over. We have been advised by the SP that we can use this interface how we wish (i.e. feed it into a ...
2
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1answer
138 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
6
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2answers
627 views

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of ...
5
votes
1answer
140 views

Cross datacenter IP failover/migration

I am trying to wrap my head around this (very) simple issue of IP failover from one physical location to another. I have a few Virtual machines running at Site A where I need to rebuild the NAS. In ...
8
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3answers
1k views

Is there a performance difference between a managed an unmanaged network switch?

Is there a tangible difference in speed/latency between a managed and unmanaged network switch?
2
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2answers
41 views

Can Multicasting be duplicated by broadcasting on a subnet?

Is there any functional difference between: A) Broadcasting to a range of addresses B) Putting the range of addresses into a subnet and broadcasting to that subnet Would it matter if there was a ...
1
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1answer
53 views

from where/how is the figure of 50 m sec protection switching time calculated in case of ERP/ MPLS?

From where or how does the figure of 50 m sec protection switching calculated for MPLS/ ERPS?
2
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1answer
49 views

Network ( routing and switching) , security

In my company network i am installing new cisco2811 router but i have problem, my LAN network can not ping and access network. i get point to point internet from ISP. PTP IP is 192.186.86.200/24 and ...
1
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1answer
132 views

Understanding IP multicast in linux [closed]

My ultimate goal is to setup IGMP snooping on a linux machine using netfilter hooks. This is for exploratory purposes to understand IGMP protocol. The topology we are using is as follows: | ...
2
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2answers
49 views

Cisco router with switch interfaces help

I was wondering if a connection comes in on a Cisco router interface. Can that connection be pointed towards a switch interface if said router has a switching module? I haven't tried it, but I'm ...
0
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2answers
82 views

Layer 2 Routing between subnets and VLANS [closed]

I am studying for my Networking exam and from what I have pieced together from other posts on here is this. Please correct me if I'm wrong: Layer 2 switches can only route packets between different ...
3
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1answer
511 views

Using IGMP but Multicast still Flooding

Im new here. I want to ask about the multicast, The first case is, I have switch HP 2530 24 port with 24 10/100 and 2 100/1000 NIC, And i have servers with bandwidth video multicast around 120-...
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1answer
164 views

Help this problem with Dhcp Server with two switches

I will try to explain my problem. I am trying that Switch 1 can give dhcp for pcs but i cannot, in Switch 0 I can give dhcp server in the pcs. sorry for my bad english ROUTER ! version 15.1 no ...
1
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2answers
45 views

Advice on potentially needed subnet expansions

I work for a non-profit with some slightly more antiquated hardware. We have 3 locations, about 700 devices across them. Right now our locations are set up as: Location 1 (Main) - /23 with a DHCP ...
0
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1answer
232 views

Is forwarding rate important for selecting a collapse core switch in IP camera implementation?

I need to select a core switch that will connect my access switch to an IP surveillance's server. The point is that in my network I'll have 109 IP camera sending real time traffic to the server and I'...
5
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2answers
74 views

Network Ten LTE Hubs Into One Network

I'm working through a tricky situation getting a field office set up out in a very rural area. There are ten 12' x 60' trailers being set up (2-3 metres apart from one another), each with varying ...
3
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2answers
45 views

Cisco Router 1800 series doesn't route internet

Working on an issue with a 1800 series Cisco Router. Router get's Internet just fine, can ping Google, Microsoft, etc.. Router is connected to a switch, switch connects 2 workstations running Windows ...
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2answers
61 views

Cellular signal handoff

In a cellular network like T-Mobile, Sprint, etc. if one sector of a tri-sector tower is maxed out and can't accept new calls, will a new call request normally served in that sector be handed off to ...
2
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1answer
142 views

Packet vs Circuit switching

I have a 1Mb/s link each user uses 100Kb/s when active. With 10 user active 10% of the time, I can have 10 users in a circuit switched environment. Packet switching with 35 users, probability > 10 ...
1
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1answer
61 views

Circuit switching. How is the data rate divided for each circuit in a link for FDM and TDM?

FDM allocates portions of bandwidth to each circuit in the link. According to the Nquist equation, this would propotionally divide the data rate among the circuits. Now with TDM time slots are ...
3
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1answer
662 views

End-to-End delay

I’m working through questions from computer networking top down approach and was hoping to get some clarity on the end-to-end delay calculation. At this stage we are not considering processing, ...
1
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1answer
112 views

Frame transfer from one switch to another configured with VLANS

Hi, My question is related to the Vlan. And this question would consist of 2 parts. 1)Would Switch 1 know all the devices present in Vlan 2 or Vlan 3, including the ones present in the Switch 2. ...
2
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2answers
152 views

Multi Chassis Ether Channel Best Practice

in our topology we have our Data Server(Multi Virtual Servers) and Backup Server exist in two different buildings and the current connection between them as below: Connection explanation: *1st ...
3
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1answer
76 views

Why switch has records in mac-table when i just set ip address to the hosts which connected to the switch?

I created a new switch and connected to two hosts in GNS3.Like this: Host1--->LS<---Host2, i think the mac-table in the switch should be empty before i sent data between two hosts. But when i just ...
1
vote
1answer
50 views

SNMP returns strange “bits sent/received” values on a particular port, why?

I have a HP V1910 Switch in my office. I have set up monitoring via SNMP on my local Zabbix server, and everything looks really good on almost all ports (for example, when I use iperf to test ...
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4answers
872 views

Can we run the Internet on circuit switching?

Generally we use IP and ATM for data communication and can we use circuit switching for data communication ? Can we use circuit switching for Internet ?
4
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1answer
315 views

QoS Policing vs Shaping, why policing

Regarding QoS, we have two modes: shaping or policing. The policing drops packets while shaping put the packets in buffer. Shaping seems to be the better solution in a general ways, so, why use ...
1
vote
1answer
257 views

Cannot ping or SSH into new Catalyst 2960-CX switch from the server VLAN (1)

I recently setup a Cisco Catalyst 2960-CX switch at work (I'm a SysAdmin at a SMB). Our workstations use VLAN 3, but our servers use VLAN 1. The management IP of the new switch (in VLAN 3) is 192.168....
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0answers
66 views

Cisco stacking - priority and number information

In case of switches stacking, where are stored the information about the switch number and the switch priority ? After a reset, these information were conserved.
1
vote
1answer
86 views

Calculating buffer capacity

The serialization delay is the amount of time it takes to forward bits out of an interface. A 1 gigabit per second interface can send 1 billion bits per second. One billion bits per second equates to ...
3
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2answers
857 views

Does it make sense to map a VLAN to each LAN?

I saw a picture of a network-structure with VLANs in it: Why would somebody structure their network like this? Does this even make sense? I mean, they are in a different LAN, why then mapping a VLAN ...
2
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1answer
558 views

Really basic SG300 VLAN setup not working

My understanding of VLANs may need improved, but isn't the idea that you can run multiple LANs at layer 2 level over the same router if VLANs are setup correctly on the SG300? If so, I fail to see how ...