AT&T RAN Engineer Interview Questions and Answers

Q1. Tell me About yourself in brief
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Q2. Questions Related to Technologies and Prior Experience
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Q1. Do you know how firewall works
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Firewall acts as a barrier between a trusted internal network and untrusted external network, controlling incoming and outgoing traffic based on predetermined security rules.
• Firewall filters network traffic based on rules set by administrators

• It can block or allow traffic based on IP addresses, ports, protocols, etc.

• Firewalls can be hardware-based or software-based

• Examples include Cisco ASA, Palo Alto Networks, and pfS
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Q1. What is networking?
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Networking is the practice of connecting computers and other devices to share resources and information.
• Networking involves the use of hardware such as routers, switches, and cables to create a network.

• It also includes the use of software protocols like TCP/IP to facilitate communication between devices.

• Networking allows devices to share resources such as files, printers, and internet connections.

• Examples of networking
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Q2. What is DHCP,DNS,VLAN,size of IPv4 and IPv6,
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DHCP assigns IP addresses, DNS translates domain names to IP addresses, VLAN separates network traffic, IPv4 has 32-bit addresses, IPv6 has 128-bit addresses.
• DHCP (Dynamic Host Configuration Protocol) assigns IP addresses to devices on a network dynamically.

• DNS (Domain Name System) translates domain names to IP addresses.

• VLAN (Virtual Local Area Network) separates network traffic into different segments.

• IPv4 has 32-bit...read more
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Q1. Osi layer,dhcp snooping, tcp/ip, basic questions about is-is,ospf,bgp, different between default vlan and native vlan, Stp, cisco switch models, ip address types, telnet, ssh, syslog, snmp, vpn, radius ser...read more
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Q1. Why nokia and why this job
Ans. 
Nokia is a global leader in telecommunications technology and I am passionate about RF engineering, making this job a perfect fit for me.
• Nokia is a renowned company with a strong reputation in the telecommunications industry

• I have a deep interest in RF engineering and Nokia offers opportunities to work on cutting-edge technologies in this field

• The company's commitment to innovation and continuous learning aligns with m
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Q2. Some basic fundamental questions from theory
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Q1. Different n/w layers
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Different network layers include physical, data link, network, transport, session, presentation, and application layers.
• Physical layer: responsible for transmitting raw bits over a communication channel

• Data link layer: responsible for error-free transfer of data between nodes on a network

• Network layer: responsible for routing data packets between networks

• Transport layer: responsible for reliable data transfer between a...read more
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Q1. Firewall works on what layers
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Firewall works on multiple layers of OSI model
• Firewall operates on layers 3 (network layer) and 4 (transport layer) of the OSI model

• It can filter traffic based on IP addresses, ports, protocols, and other criteria

• Firewalls can also perform deep packet inspection to detect and block malicious traffic

• Examples of firewall software include Cisco ASA, pfSense, and Windows Firewall
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30 questions 30 minutes
Verbal aptitude 10 Q
Quantitative aptitude 10 Q
Logical reasoning 10 Q

Q1. Cell structure, GSM ,CDMA ,Osi model layer ? It's function? Diffrent types of protocols ? Router / switch / hub working and function . Port no .DNS ? What is Arp and rarp ?
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Q1. Tell me about yourself ? Your hobbies ? Job description
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