Tag: layer2

17 What, exactly, is required to make Airplay work across VLANs? 2014-01-21T19:51:01.987

15 How is the root bridge elected in STP? 2013-05-08T11:07:04.530

13 Tracking down an invalid source mac address 2013-09-11T05:05:58.840

13 MTU and Fragmentation 2013-10-08T03:21:09.320

12 Can a router send ARP requests to hosts? 2016-12-27T18:18:45.947

11 VXLAN vs VLAN over layer 3 2017-12-04T11:35:17.803

9 What is the relationship between the bandwith on a wire and the frequency? 2014-01-25T12:12:33.507

8 RIB vs FIB differences? 2017-02-02T19:47:19.047

7 How do I set up a VLAN between an ESXi VM and Physical Hardware? 2013-07-11T18:39:03.863

7 Does a switch understand packets? If yes, what is the frame terminology for? 2017-02-12T18:40:02.537

7 How LAN works in video games if only one station is permitted to transmit? 2018-03-17T23:05:47.517

6 Cisco: Is it possible to see an EFP path within an EVC? 2014-06-24T11:28:05.160

6 How does a layer-2 switch work with UDP? 2016-06-13T16:22:01.900

6 Should I disable STP on my access ports? 2017-01-23T14:48:09.157

6 Why preamble is not considered a part of the Ethernet Header? 2017-11-09T01:07:47.800

6 How is the Groupwise Transient Key used in WiFi networks? 2018-10-25T18:09:26.843

5 What OSI layer do Access Points operate on? 2013-08-06T18:41:31.473

5 Cisco: storm-control unicast 2013-12-06T15:25:40.330

5 Cisco 6509 as PPPoE BRAS 2014-01-27T10:43:23.347

5 Why each and every single port on Layer 2 switches need to have it's own MAC address? 2014-09-09T19:25:09.477

5 Media Access Control for WAN protocols (equivalent to IEEE 802.3 Ethernet sublayer) 2014-09-16T00:36:07.247

5 Why use 'switching' term for packet switching 2014-09-23T03:06:24.987

5 What blocks a computer from another network in the same switch from answering an ARP request? 2015-10-27T12:05:46.627

5 In Cyclic Redundancy Check, how does the receiver knows what the generator polynomial is? 2015-11-17T15:46:13.067

5 Finding Source MAC Address of A Packet 2016-05-13T11:21:30.580

5 How are duplicate packets handled at the Data Link Layer? 2017-02-06T07:27:23.623

5 How is the length of a PPP frame known? 2017-04-03T13:18:34.657

5 ETH II vs 802.2 LLC/SNAP 2018-05-17T15:07:02.757

5 Do layer 3 protocols use layer 2 protocols? 2018-10-30T20:28:32.620

4 How to trace a MAC address on a switched LAN? 2014-01-13T21:26:48.090

4 Network topology suggestions? 2014-08-29T19:54:40.107

4 Ethernet Neighbor Discovery? 2015-05-19T21:28:44.603

4 Campus Area Network questions 2016-02-19T17:20:02.863

4 How does a NIC know where the start of a frame is? 2017-08-25T17:25:19.670

4 What's use of Port Isolation vs traditional VLANs? 2017-11-27T10:27:57.597

4 Error Detection across OSI layers confusion 2018-02-08T18:35:52.010

4 High availability LAN segment with Cisco ISR4451X and 2 x Netgear GS724 - Port-channel vs. BDI vs. BVI? 2018-03-27T16:03:53.620

4 Do we send ack frames in ethernet? if not then how does a router know if its neighbors are down or not? 2018-07-16T14:47:25.237

3 Is Layer 3 web auth with Layer 2 PSK more secure? 2013-11-04T19:10:00.917

3 Why are there checksums for different OSI layers? 2013-11-27T10:04:19.640

3 When are MAC addresses used instead of IP addresses in the OSI model? 2014-07-07T05:05:35.637

3 Chained wireless links, low network bandwidth 2015-06-02T13:23:25.563

3 What does this "no switchport" command do? 2015-11-11T14:37:34.987

3 Do broadcast (FF:FF:FF:FF:FF:FF) packets go through the router, or directly all computers on the subnet? 2016-01-21T21:52:32.080

3 How are layer 2 broadcast handled 2016-01-24T01:44:12.503

3 Inter-switch IGMP on a VLAN with two switches, and a multicast source per switch 2016-02-29T23:02:13.360

3 What is the difference between layer-2 and layer-3 broadcasts? Please explain with an example 2016-04-04T00:12:36.897

3 What practices/ mechanisms/ protocols can be used to secure communication on physically exposed Ethernet links? 2016-04-11T09:13:47.033

3 Encapsulation and decapsulation basics for OSI layer 2016-12-02T18:54:07.637

3 necessary and sufficient condition for vlans to communicate together 2017-05-18T09:03:11.790

3 How can Layer 2 frames be encapsulated? 2017-07-31T11:44:28.423

3 Bridge for collision domains 2017-08-16T23:35:32.703

3 VLAN Isolate Setup 2018-01-18T23:16:50.507

3 Example VLAN without any Router -- Security Problems? 2018-01-19T00:23:14.637

3 Does an ethernet checksum include padding bits? 2018-02-28T01:38:23.580

3 Is there 64k range VLAN support? 2018-04-25T12:10:28.953

3 Does it make sense to map a VLAN to each LAN? 2018-06-01T10:15:44.360

3 Is there a Layer 2 address advertising protocol? 2018-07-28T21:48:11.097

3 Does WiFi broadcast traffic from a station go through the access point? 2018-10-25T06:01:37.207

3 How the packet is routed between two host from same sub-net and associated with same AP? 2018-10-30T04:05:26.073

3 Spanning Tree on the interface that resides at end users 2018-10-30T13:31:23.533

3 How does STP convergence work? 2018-11-27T21:07:57.667

2 Is MTU adaptive for any OSI layer 2 protocols? 2013-08-12T15:30:39.303

2 To connect 3 LAN to a switch 2014-07-15T07:22:16.810

2 How does IS-IS carry IP routes? 2014-08-17T19:00:01.850

2 Routing the same subnet in two locations / gateways? 2014-11-05T21:09:19.347

2 Should I receive an ARP reply from a host that is logically on a different subnet but is connected to my host via a hub? 2014-11-06T00:51:29.397

2 Layer 2 vs Layer 3 core - with HP IRF 2014-12-29T17:04:52.327

2 Gateway interface latency is very high, while latency of traffic traversing gateway is very low? 2015-01-05T20:13:50.887

2 D-Link L2 & L3 Network Setup 2015-04-03T18:35:06.780

2 ping in pure layer 2 LAN 2015-07-15T18:00:46.320

2 Configuring RSTP and LACP. Unplugging a LACP port causes a topology change and pauses all switch traffic 2015-07-24T16:36:30.623

2 Juniper EX Unicast Flooding 2015-10-30T03:46:52.557

2 Why token ring uses a physical star? 2015-11-08T15:42:24.073

2 What is the relationship between the IP address and MAC address? 2015-11-08T16:13:53.710

2 What is the difference between ff-ff-ff-ff-ff-ff (layer 2 broadcast) (layer 3 limited broadcast)? 2015-11-29T20:16:18.623

2 Flow Control vs. Storm Control 2015-12-15T16:00:58.770

2 Enabling flow control on my ethernet NIC 2016-01-14T16:08:03.667

2 Can pause frames be forwarded through a layer 2 managed switch? 2016-01-18T17:28:22.387

2 Difference between data link and transport layer error detection? 2016-01-22T08:24:14.487

2 In the Data Link Layer, is it better to use large or small frames? 2016-01-23T23:37:32.517

2 Difference between routing, forwarding, switching 2016-07-30T08:53:19.520

2 Cisco 3570x stack behaviour 2016-09-01T19:43:53.680

2 Switch vs Router 2016-09-16T18:56:49.530

2 How to prevent loop while trunking Fortigate and Cisco L2 Switches 2016-11-16T14:51:14.077

2 Lowest Possible Failover Latency 2016-12-03T05:57:03.980

2 Mac address and IP address in physical addressing in Data-Link layer 2016-12-04T18:23:04.967

2 Why does Neighbor Discovery Protocol have to monitor upper-layer protocols? 2017-02-02T16:50:06.317

2 Understanding VLAN tagging 2017-02-06T17:09:02.050

2 How does the encrypted Wi-Fi protocols relate to ethernet? 2017-04-28T16:44:41.107

2 How do modern switches forward ethernet frames logically? 2017-05-24T18:18:32.343

2 How often does it happen that at the Layer 2 (MAC) an error goes undetected? 2017-09-11T08:59:03.083

2 Why is the FCS not included in most ethernet frames? 2017-11-02T12:28:10.640

2 What is the difference between CAM and FIB table? 2018-03-06T08:40:13.893

2 Routing steps on a serial port 2018-04-23T20:18:41.277

2 Connecting Layer 2 switchport to layer 3 port 2018-09-10T16:02:06.390

2 Layer 2 error correction 2018-09-21T13:41:02.640

2 Can Multicasting be duplicated by broadcasting on a subnet? 2018-09-26T20:48:47.057

2 L2 / L3 on CISCO ASR 2018-11-19T14:24:24.890