STP Interview Questions and Answers Vol 1.0
STP Interview Questions & Answers Vol 1.0
Check the complete list of questions:
- What is BID made up of in STP?
- What is the value of system ID in BID (Bridge ID)?
- What are Spanning Tree Protocol default timers?
- What single command will make Switch root for Vlan 10?
- RSTP provides a faster transition to the forwarding state on point-to-point links than STP does – Validate the statement?
- Which command enables RSTP on a switch? Which are two-port states when RSTP has converged?
- What is BPDU? What are the 2 types of BPDUs?
- At which layer of the OSI model is RSTP used to prevent loops?
- Is RSTP compatible with the original IEEE 802.1D STP?
- Which protocol is used by bridges and/or switches to prevent loops in a layer 2 network?
- Which switch would STP choose to become the root bridge in the selection process out of these 2 – (A) 32768: 11-22-33-44-66-55 (B) 32768: 22-11-33-55-66-77?
- What are different port states of STP? Arrange STP port states in chronological order?
- Which specifications will allow you to associate VLAN groups to STP instances so you can provide multiple forwarding paths for data traffic and enable load balancing?
- Explain different type of STP port roles?
- What is the destination mac address used for BPDUs?
- What is the major advantage of MSTP?
- How is Root Bridge selected?
- What is Root Port?
- What is the extended system ID?
- Which type of ports are configured under portfast?
- What is one benefit of PVST+ compared to PVST?
- STP uses the which criteria to decide whether to place a port in a Forwarding state or Blocking state?
- Does STP use which steps to select its paths?
- What is portfast in STP ?
- What is a port priority in STP?
- Which command will let you know about the cost of ports configured?
- Which port state is introduced by Rapid-PVST?
- What conditions cause an STP topology change? What effect does this have on STP and the network?
- A Root Bridge has been elected in a switched network. Suppose that a new switch is installed with a lower Bridge ID than the existing Root Bridge. What will happen?
- Suppose that a switch receives Configuration BPDUs on two of its ports. Both ports are assigned to the same VLAN. Each of the BPDUs announces Catalyst A as the Root Bridge. Can the switch use both of these ports as Root Ports? Why?
- What conditions can cause ports on a network’s Root Bridge to move into the Blocking state?
- What parameters can be tuned to influence the selection of a port as a Root or Designated Port?
- In a BPDU, when can the Root Bridge ID have the same value as the Sender Bridge ID?
- Using the default STP timers, how long does it take for a port to move from the Blocking state to the Forwarding state?
- Over what VLANs does the CST run?
- What happens to BPDU packet when STP is disabled on the port?
- Can STP be configured on a router?
- Is STP required to be configured when there is only one switch?
- Is an Ethernet frame modified when STP is configured on the network
- How many root bridges can be available on an STP configured network?
- If the priority value of the two switches are the same, which switch would be elected as the root bridge?
- Which mechanism is used to detect the unidirectional links failure and addressing bridging loops?
- If the Root Bridge sets the Topology Change flag in the BPDU, what must the other switches in the network do?
- How many root ports are there for each non-root bridge?
- Which STP version runs on cisco Switches?
- What is the difference between Root port and designated port?
- What is the function of BPDU Filter?
- If we want to disable STP on a port connected to a server, which command would you use?
- Can we use BPDU filter on trunk ports?
- One end of every link should be designated port. What 2 states can the other port be part of?