BT Group Associate Network Engineer Interview Questions and Answers

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

4G architecture includes radio access network (RAN), core network, and user equipment (UE) with interfaces like S1, X2, and LTE-Uu.

• 4G architecture consists of Radio Access Network (RAN), Core Network, and User Equipment (UE)

• Interfaces used in 4G architecture include S1, X2, and LTE-Uu

• RAN connects UE to the core network, while X2 is used for communication between base stations

• LTE-Uu is the air interface between UE and b

PRB can be calculated by dividing the total available bandwidth by the bandwidth per PRB.

• Calculate total available bandwidth

• Determine the bandwidth per PRB

• Divide total available bandwidth by bandwidth per PRB to get the number of PRBs

A segment is a portion of a network that is separated by switches or routers.

• Segments help to divide a network into smaller parts for better organization and management.

• Each segment typically has its own subnet and can be controlled independently.

• Segments can improve network performance by reducing congestion and improving security.

• For example, a company may have separate segments for different departments like sales,

Load balancing can be done by distributing network traffic across multiple servers to ensure optimal resource utilization and prevent overload.

• Implementing a load balancer device or software

• Configuring load balancing algorithms such as round-robin, least connections, or IP hash

• Monitoring server health and adjusting traffic distribution accordingly

• Scaling resources up or down based on traffic demands

SD Congestion can be found by monitoring network traffic, analyzing performance metrics, and identifying bottlenecks.

• Monitor network traffic using tools like Wireshark or NetFlow

• Analyze performance metrics such as latency, packet loss, and throughput

• Identify bottlenecks in the network infrastructure, such as overloaded switches or routers

External interference can be removed by implementing shielding, using filters, adjusting frequencies, and improving signal strength.

• Implement shielding to block external signals from interfering with the network

• Use filters to eliminate unwanted frequencies that may cause interference

• Adjust frequencies to avoid overlapping with other nearby networks

• Improve signal strength to overcome interference from distant sources

LTE Accessibility formula calculates the probability of successful connection to the LTE network.

• LTE Accessibility = (RSRP - PL) - (UE Noise + Interference)

• RSRP: Reference Signal Received Power

• PL: Path Loss

• UE: User Equipment

My current CTC is $80,000 per year.

• My current CTC is $80,000 per year

• I am open to discussing salary expectations during the interview process

• I have experience negotiating salary based on skills and experience