Network Engineering Stack Exchange by Kiwix

Q&A for network engineers

Most popular questions

152 The slash after an IP Address - CIDR Notation 2013-10-23T15:57:09.410

104 Why do we need a 3-way handshake? Why not just 2-way? 2015-11-04T14:36:05.997

88 IPv6 address space layout best practices 2013-05-08T11:58:14.957

86 How do you calculate the prefix, network, subnet, and host numbers? 2014-03-31T01:06:08.070

76 When to choose fiber instead of twisted pair (copper) 2013-05-08T06:55:11.447

71 Is "IPv10" a joke or a serious RFC draft? 2017-09-09T14:19:21.763

69 Why and how are Ethernet Vlans tagged? 2014-02-25T09:07:51.200

67 What's the difference between IKE and ISAKMP? 2013-05-07T20:41:34.453

55 Why are IPv4 addresses running out? 2018-10-13T14:53:40.247

54 Is 30 Mbit/s fibre faster than 30 Mbit/s copper? 2018-02-21T18:48:02.807

52 Multi-Mode and Single-Mode Fiber Differences 2013-05-16T19:17:44.253

50 Why only port 80 for web services? 2013-06-20T14:14:40.490

47 Does having a longer Ethernet cable slow your connection? 2016-08-17T11:19:30.663

46 How can I see which switchports are not in use? 2013-05-20T13:30:08.600

45 Network Neutrality, how does it actually work, technically speaking? 2014-05-15T14:05:04.370

42 How can I diagnose a bridging (ethernet) loop? 2013-05-15T10:19:22.387

42 Why do we need IPv6? 2015-11-06T12:27:06.270

39 Why is fe80::/10 reserved for link local addresses when fe80::/64 is actually used? 2013-05-08T14:21:19.650

39 How to check for a valid public IP address? 2013-07-10T10:40:49.143

39 Why is such a large IPv4 range assigned to localhost? 2013-08-16T07:26:07.343

39 Bits per second vs. Packets per second 2013-09-06T21:38:28.657

38 How do you prevent rogue wireless access points on a network? 2013-05-08T12:48:41.247

37 Why does ipv6 specify 128 bit address, when there are only 48 bits in MAC addresses? 2013-06-04T09:25:44.260

37 Why do I see a RST, ACK packet instead of a RST packet? 2013-06-21T19:56:44.860

37 Why was the MTU size for ethernet frames calculated as 1500 bytes? 2013-08-24T16:14:32.097

36 How would a router with /32 WAN subnet mask communicate with the rest of the Internet? 2013-05-19T19:32:22.587

35 Why are Ethernet Standards written in the form of 10/100/1000? Why not just 1000? 2016-02-24T02:52:26.487

34 Why do network taps have four ports? 2013-05-15T20:29:01.537

32 Using SNMP to retrieve the ARP and mac-address tables from a switch 2013-08-21T07:55:46.070

32 Does a traceroute/tracert show every hop, or does it skip/hide some details of the path? 2013-11-16T14:53:45.400

32 How does gratuitous ARP work? 2014-05-02T06:00:20.827

32 Why are IPv4 addresses 32-bit? 2014-05-15T15:16:36.530

31 Better Enterprise Multihoming 2013-05-08T01:54:05.750

31 How can I stop an intruder plugging into an Ethernet wall socket getting access to the network? 2015-09-06T14:36:26.863

29 Difference between Subnet and VLAN? 2013-05-26T09:50:31.643

29 PING port number? 2017-01-09T11:27:18.897

28 What are the downsides of OpenVPN? 2013-05-26T19:42:50.340

28 What is the actual size of an Ethernet MTU 2013-11-19T19:41:23.360

28 What does the 1000M on a network switch mean? 2016-02-10T21:38:28.090

27 Are CoS and QoS ever interchangeable? 2013-05-07T22:28:11.773

27 What is the meaning of the CRC counter on a cisco device? 2013-05-31T08:53:09.813

27 Why do we still use Ethernet? 2013-09-07T02:41:30.440

26 What is the difference between MSS and MTU? 2014-06-08T04:30:45.857

25 Does it make sense to deploy OSPF across Metro Ethernet? 2013-05-07T22:31:43.367

24 Accidentally Removed Allowed VLANs from Cisco Switch Dot1Q Trunk 2013-05-28T05:28:43.470

24 Why is 4096 the max value for VLANs 2013-10-04T14:16:03.507

24 Why 192.168.*.* for local addresses? 2014-01-13T22:28:29.123

23 Can I use a Catalyst 2960-S for iSCSI? 2013-05-08T15:08:44.473

23 Emulate Ethernet frame loss for testing purposes 2013-05-09T13:11:17.917

23 How to find the port a device is connected to, based on IP, on a Cisco Catalyst switch 2013-05-19T00:21:55.607

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