Top 60 Most Common Switching Interview Questions [UPDATED 2020]

Question 1  What is switching?

Question 2  What is a Switch?

Question 3  Difference between hub, bridge and switch?

Question 4  What is the difference between a HUB, Switch & Router?

Question 5 What is mac address and why it is required?

Question 6 What are the functions of a Switch?

Question 7 In layer 2 domain do we need ip address for communication?

Question 8  What is Sub Interface?

Question 9 What is ARP and why it is required?

Question 10  What is Spanning Tree Protocol aka STP?

Question 11 What is a Broadcast Domain and a Collision Domain?

Question 12  What is the difference between STP, MSTP, PVST and RSTP?

Question 13 Can we use the two same paths for same VLAN?

Question 14 What is the difference between broadcast and collision domain?

Question 15  Define type of LAN traffic.

Question 16 Compare HUB and Switch with respect to broadcast and collision domain?

Question 17  What is destination address of broadcast frame?

Question 18 Can we connect a switch to switch with straight cable?

Question 19 Define functions of switch.

Question 20 What is ARP timeout?

Question 21 What is aging process?

Question 22  What is BPDU?

Question 23 What is a MAC address Table and how a Switch will build a MAC table?

Question 24  How Switch Learns Mac Address?

Question 25 What is path cost?

Question 26 Define selection criteria of STP Root Bridge.

Question 27 How to non-bridge decide which port will elect as root port?

Question 28 If a non-root bridge has two redundant ports with the same root path cost, how does the bridge choose which port will be the root port?

Question 29  Port states of spanning tree protocol.

Question 30  If the users face delay during initial login, what you will suggest to implement?

Question 31 Why spanning tree BPDU filter is used?

Question 32  How does Switch performs Forwarding function?

Question 33 Can I use BPDU filter on trunk ports?

Question 34  What is port security?

Question 35 I want to learn only a single mac from the port, what need to be configured?

Question 36  Can we use spanning portfast on trunk ports?

Question 37 If management ip address is changed, will user’s traffic will be dropped?

Question 38  Difference between trunk and access port?

Question 39 What is UDLD and why it is required?

Question 40 What is VLAN?

Question 41  What is Static VLAN?

Question 42 What is Dynamic VLAN?

Question 43 What is interface VLAN on switch?

Question 44 What are the VLAN membership types?

Question 45 What are the types of VLAN connection links?

Question 46 What is VLAN Frame Tagging?

Question 47 How to perform inter vlan routing without layer 3 device?

Question 48 What are the different VLAN Frame tagging techniques?

Question 49  How to stop superior BPDU participating in switching domain?

Question 50 What are the different VLAN Frame tagging techniques?

Question 51 What is Native VLAN?

Question 52 How VLAN In Local Switching Domain is selected?

Question 53 What are the VLAN Trunking Protocol (VTP) Modes?

Question 54 How to provide redundancy to MPLSVPN customer?

Question 55 What is VTP?

Question 56 What is VTP Domain?

Question 57 What is VTP Pruning?

Question 58 What is VTP Server Mode?

Question 59 What is VTP Transparent Mode?

Question 60 What is VTP Client Mode?

Question 61 Explain unknown unicast Flooding?