NOC Network Engineer L1 Interview Questions and Answers

To troubleshoot STP configuration, check for incorrect VLAN assignments, port configurations, and STP settings.

• Verify that the correct VLANs are assigned to the correct ports.

• Check that the root bridge is properly configured and that all switches are using the correct root bridge.

• Ensure that portfast is not enabled on ports that connect to other switches.

• Check for any blocked ports and investigate the reason for the blocking.

• Use show commands such as show spanning-tree and sh...read more

BGP routing can be configured by setting up neighbor relationships, defining network prefixes, and applying routing policies.

• Establish neighbor relationships using the neighbor command

• Define network prefixes using the network command

• Apply routing policies using the route-map command

• Configure BGP attributes such as AS number and router ID

• Use show commands to verify BGP configuration and troubleshoot issues

Load balancers distribute network traffic across multiple servers to improve performance and availability.

• Load balancers help distribute traffic to multiple servers to prevent overloading and improve performance.

• They can also improve availability by redirecting traffic to healthy servers in case of failures.

• Load balancers can be hardware or software-based, and can use different algorithms to distribute traffic.

• Examples of load balancers include F5, Citrix NetScaler, and HAPro...read more

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol that manages VLAN configurations across a network.

• VTP allows for centralized management of VLANs and reduces the need for manual VLAN configuration on each switch.

• VTP operates in three modes: server, client, and transparent.

• In server mode, a switch can create, modify, and delete VLANs and propagate the changes to other switches in the same VTP domain.

• In client mode, a switch can only receive and store VLAN informati...read more