BT Group Network Security Lead Interview Questions and Answers

I am a dedicated and experienced Hardware & Networking Engineer with a passion for technology and problem-solving.

• Experienced in troubleshooting hardware and networking issues

• Proficient in configuring and maintaining network devices

• Skilled in implementing security measures to protect networks

• Certified in Cisco networking technologies

• Passionate about staying up-to-date with the latest technology trends

I took a gap year to gain practical experience in the field and explore different career opportunities.

• To gain practical experience in the field before committing to a full-time job

• To explore different career opportunities and find the right fit

• To travel and gain new perspectives before starting a career

• To take a break and recharge before entering the workforce

Routers switch configuration and commands involve setting up and managing network devices for efficient data routing.

• Routers use commands like 'show ip route' to display routing table information

• Configuration involves setting up IP addresses, subnet masks, and default gateways

• Commands like 'show interfaces' can display interface status and configuration details

Computer hardware networking involves the design, installation, and maintenance of computer networks and related hardware.

• Designing and configuring computer networks

• Installing and maintaining network hardware such as routers and switches

• Troubleshooting network issues

• Implementing network security measures

• Knowledge of network protocols and technologies such as TCP/IP, DNS, and VPNs

Load balancing involves distributing network traffic across multiple servers to optimize resource utilization and prevent overload.

• Parameters for load balancing include server health, server capacity, and current network traffic.

• To improve various KPIs like VDR, HOSR, Initial ERAB, CQI, and SSSR, you can adjust load balancing algorithms, optimize server performance, and monitor network traffic.

• For example, you can use ...read more

BNP Paribas is a French multinational bank and financial services company.

• Founded in 2000 through the merger of Banque Nationale de Paris and Paribas

• Headquartered in Paris, France

• Offers a range of financial services including retail banking, investment banking, and asset management

• Operates in over 70 countries worldwide

• One of the largest banks in the world by total assets

BGP, EIGRP, and ISIS are routing protocols used in networking.

• BGP (Border Gateway Protocol) is used for routing between different autonomous systems.

• EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary protocol used for routing within a single autonomous system.

• ISIS (Intermediate System to Intermediate System) is a protocol used for routing within a single autonomous system, similar to EIGRP.

• BGP us...read more

VPN is a secure connection between two networks while VLAN is a logical grouping of devices on a network.

• VPN stands for Virtual Private Network and is used to securely connect two networks over the internet.

• VPN uses encryption to protect data transmitted over the network.

• VLAN stands for Virtual Local Area Network and is used to logically group devices on a network.

• VLANs can be used to separate traffic on a network for ...read more

OSI and TCP/IP models are reference models used to describe how data is transmitted over a network.

• OSI model has 7 layers, while TCP/IP model has 4 layers

• OSI model is theoretical, while TCP/IP model is practical

• OSI model is used for teaching and understanding networking concepts, while TCP/IP model is used for actual implementation

• Examples of layers in OSI model: Physical, Data Link, Network, Transport, Session, Presen...read more

MPLS is a protocol for efficient data transfer, MP-VPN is a VPN service using MPLS, and MPLS-TE is a traffic engineering extension of MPLS.

• MPLS stands for Multiprotocol Label Switching and is used to efficiently route data packets through a network.

• MP-VPN is a VPN service that uses MPLS to securely connect multiple sites or users to a private network.

• MPLS-TE is an extension of MPLS that allows for more precise traffic ...read more

MTU stands for Maximum Transmission Unit. It is the largest size of data packet that can be transmitted over a network.

• MTU is measured in bytes.

• The default MTU size for Ethernet is 1500 bytes.

• To find the MTU size for CE/PE, you can use the ping command with the -f option to set the Do Not Fragment (DNF) bit and gradually increase the packet size until you receive a 'packet needs to be fragmented but DF set' message.

• Ano...read more

BGP attributes are characteristics used to determine the best path for routing traffic between networks.

• BGP attributes include: AS Path, Next Hop, Local Preference, Multi-Exit Discriminator (MED), Weight, and Origin.

• AS Path identifies the sequence of autonomous systems that the route has passed through.

• Next Hop identifies the IP address of the next router in the path.

• Local Preference is used to indicate the preferred p...read more