10+ Assistant Manager Network Interview Questions and Answers

I have worked on LTE & VoLTE features such as QoS, SRVCC, CSFB, TTI bundling, etc. and their related parameters.

• QoS parameters such as ARP, QCI, GBR, MBR, etc.

• SRVCC parameters such as HO margin, HO failure threshold, etc.

• CSFB parameters such as timer values, RAT priority, etc.

• TTI bundling parameters such as bundle size, bundle factor, etc.

• VoLTE parameters such as AMR codec modes, RTP packetization, etc.

• UE categories and their capabilities

• eNodeB configuration parameters such a...read more

HARQ & TTI Bundling are techniques used in wireless communication to improve data transmission efficiency.

• HARQ stands for Hybrid Automatic Repeat Request and is used to improve the reliability of data transmission by retransmitting erroneous packets.

• TTI Bundling stands for Transmission Time Interval Bundling and is used to reduce latency by transmitting multiple packets in a single transmission time interval.

• The value set for HARQ in the network depends on the specific implem...read more

CFRA and CBRA are different algorithms used in RACH. Success rates can be fetched separately.

• CFRA stands for Contention Free RACH Algorithm, while CBRA stands for Contention Based RACH Algorithm.

• CFRA is used for devices with higher priority, while CBRA is used for devices with lower priority.

• Success rates for CFRA and CBRA can be fetched separately by analyzing the RACH logs.

• CFRA success rate is usually higher than CBRA success rate due to its priority usage.

The maximum throughput in LTE network with 20MHz TDD bandwidth depends on various factors.

• Theoretical maximum throughput is 1.6 Gbps

• Practical maximum throughput is around 1 Gbps

• Actual throughput depends on factors like signal strength, interference, number of users, etc.

• Carrier aggregation and MIMO can increase throughput

• Real-world throughput can be measured using tools like speedtest.net

We ensure accessibility improvement in LTE network through various measures.

• Conducting regular network audits to identify areas of improvement

• Deploying small cells and repeaters to improve coverage in remote areas

• Implementing carrier aggregation to increase network capacity

• Providing network optimization services to improve network performance

• Collaborating with device manufacturers to ensure compatibility with our network

• Offering accessibility features on our devices such as t...read more

The mobile network operator has major involvement in SRVCC.

• SRVCC stands for Single Radio Voice Call Continuity

• It is a feature that allows a seamless handover of voice calls from LTE to 3G or 2G networks

• The mobile network operator is responsible for implementing and supporting SRVCC

VoLTE uses various speech codecs for efficient voice transmission.

• AMR-WB (Adaptive Multi-Rate Wideband) codec is widely used in VoLTE.

• Other codecs used include EVS (Enhanced Voice Services), Opus, and G.711.

• The choice of codec depends on factors such as network capacity, device compatibility, and call quality requirements.

FDD and TDD are two different duplexing techniques used in wireless communication networks.

• FDD stands for Frequency Division Duplexing while TDD stands for Time Division Duplexing.

• In FDD, separate frequency bands are used for uplink and downlink communication while in TDD, the same frequency band is used for both uplink and downlink communication.

• FDD is commonly used in 3G and 4G networks while TDD is commonly used in 5G networks.

• FDD provides better voice quality and is more ...read more

VoLTE e2e call flow is the process of establishing a voice call over LTE network.

• The call is initiated by the user and the device sends a SIP invite message to the IMS network.

• The IMS network authenticates the user and sends a SIP 180 ringing message to the device.

• Once the called party answers, the IMS network sends a SIP 200 OK message to the device.

• The device then sets up the media path and sends a SIP ACK message to the IMS network.

• The voice call is established and the med...read more

I have worked on various network security devices including firewalls, intrusion detection/prevention systems, and VPNs.

• Firewalls such as Cisco ASA and Fortinet FortiGate

• Intrusion detection/prevention systems such as Snort and Cisco Firepower

• VPNs such as Cisco AnyConnect and OpenVPN

• Network access control systems such as Cisco ISE

There are 3 MCS (Modulation and Coding Schemes) in LTE.

• MCS 1: QPSK modulation with coding rate of 1/2

• MCS 2: 16QAM modulation with coding rate of 1/2

• MCS 3: 64QAM modulation with coding rate of 2/3

• Higher MCS values indicate higher modulation and coding rates

• The selection of MCS depends on the channel quality and available bandwidth

LTE attach procedure is the process of a device connecting to the LTE network and obtaining an IP address.

• The device sends an attach request to the LTE network.

• The network validates the request and assigns a temporary identifier to the device.

• The network sends an attach accept message to the device, which includes the assigned identifier and an IP address.

• The device acknowledges the attach accept message and completes the attach procedure.

• The device is now connected to the LT...read more

Yes, I have worked on Cisco Nexus switches.

• I have experience configuring and troubleshooting Cisco Nexus switches.

• I have worked with Nexus 9000, 7000, and 5000 series switches.

• I am familiar with features such as Virtual Port Channels (vPC), FabricPath, and Virtual Device Contexts (VDC).

Cisco ACI is a software-defined networking solution that automates and simplifies network provisioning and management.

• ACI stands for Application Centric Infrastructure

• It uses a policy-based approach to network management

• It provides centralized automation and management of network infrastructure

• It supports multi-tenancy and integrates with various hypervisors and cloud platforms

• It includes a programmable API for integration with third-party tools and applications

Network firewall blocks traffic by analyzing incoming and outgoing packets and comparing them against a set of predefined rules.

• Firewalls can block traffic based on IP addresses, ports, protocols, and content.

• Firewalls can be configured to allow or deny traffic based on specific rules.

• Firewalls can also use intrusion detection and prevention systems to detect and block malicious traffic.

• Examples of firewall software include Cisco ASA, Fortinet FortiGate, and Palo Alto Network...read more