10+ TAC Engineer Interview Questions and Answers

RSTP BPDU introduces two new flags: TCN and Proposal.

• TCN (Topology Change Notification) flag is used to indicate a topology change in the network.

• Proposal flag is used to speed up the convergence process by allowing a switch to immediately transition to the forwarding state.

• TCN flag is set by the root bridge and propagated to all switches in the network.

• Proposal flag is set by a switch and sent to the root bridge.

• Both flags are included in the BPDU message.

• TCN flag triggers a...read more

To troubleshoot SSH issue, check network connectivity, firewall settings, SSH configuration, and user permissions.

• Check if the server is reachable over the network

• Verify if the SSH service is running on the server

• Check if the firewall is blocking SSH traffic

• Verify SSH configuration on the server

• Check if the user has the necessary permissions to access the server

• Check SSH logs for any errors or warnings

When you type google.com on your web browser, it sends a request to Google's server and loads the website.

• The browser sends a DNS request to resolve the domain name 'google.com' to an IP address

• The browser establishes a TCP connection with Google's server

• The browser sends an HTTP request to the server for the homepage of google.com

• The server responds with the HTML code for the homepage

• The browser renders the HTML code and displays the webpage

Motivating a customer on escalation edge

• Show empathy and understanding of their frustration

• Provide regular updates on the progress of the case

• Offer solutions or workarounds to mitigate the issue

• Highlight the importance of resolving the issue for their business

• Escalate the case to higher management if necessary

• Thank them for their patience and cooperation

TCP 3-way handshake is a process of establishing a connection between two devices. SSL handshake is a process of establishing a secure connection between a client and a server.

• TCP 3-way handshake involves SYN, SYN-ACK, and ACK packets exchanged between the client and server to establish a connection.

• SSL handshake involves exchanging certificates, negotiating encryption algorithms, and generating session keys.

• TCP 3-way handshake is used in TCP/IP protocol, while SSL handshake ...read more

Hub operates at physical layer, broadcasts data to all ports. Switch operates at data link layer, forwards data to specific ports.

• Hub operates at physical layer, broadcasts data to all ports

• Switch operates at data link layer, forwards data to specific ports

• Hub is less secure as it broadcasts data to all ports

• Switch is more secure as it forwards data only to specific ports based on MAC addresses

DORA process is a four-step process used by DHCP to assign IP addresses to devices on a network.

• DORA stands for Discover, Offer, Request, and Acknowledge.

• Discover: The device sends a broadcast message to find available DHCP servers.

• Offer: The DHCP server responds with an IP address offer.

• Request: The device requests the offered IP address.

• Acknowledge: The DHCP server acknowledges the request and assigns the IP address to the device.

• DORA process ensures efficient IP address as...read more

I handle customers with patience, empathy, and effective communication.

• Listen actively to their concerns and needs

• Acknowledge their frustrations and apologize for any inconvenience

• Provide clear and concise solutions to their problems

• Follow up with them to ensure their issue has been resolved

• Maintain a positive and professional attitude throughout the interaction

My biggest achievement was successfully leading a team to implement a new network infrastructure, overcoming technical challenges along the way.

• Led a team to implement a new network infrastructure

• Overcame technical challenges during the project

• Achieved successful implementation within the set timeline and budget

Developing software for corporate businesses involves creating customized solutions to meet their specific needs.

• Identify the business requirements and goals

• Design and develop software solutions

• Test and deploy the software

• Provide ongoing support and maintenance

• Ensure data security and privacy

• Examples: CRM software, inventory management systems, HR management software

The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven different layers.

• The OSI model stands for Open Systems Interconnection model.

• It helps in understanding how different networking protocols work together.

• Each layer has a specific function and communicates with the layers above and below it.

• Examples of layers include physical layer, data link layer, network layer, transport layer, session layer, presenta...read more

DNS flow refers to the process of how a DNS query is resolved from start to finish.

• Client sends a DNS query to the recursive resolver.

• Recursive resolver checks its cache for the answer, if not found, it sends the query to authoritative nameservers.

• Authoritative nameservers respond with the IP address of the requested domain.

• Recursive resolver caches the response and sends it back to the client.

• Client now has the IP address and can connect to the requested domain.

TCP flow refers to the sequence of packets exchanged between two devices over a TCP connection.

• TCP flow involves the establishment, data transfer, and termination of a TCP connection.

• It includes the exchange of TCP segments containing data, acknowledgment, and control information.

• TCP flow control mechanisms like sliding window and congestion control help regulate the flow of data.

• TCP flow can be analyzed using tools like Wireshark to troubleshoot network issues.