10+ Sify Technologies Network Engineer Interview Questions and Answers

IPv6 is the successor to IPv4, with larger address space, improved security, and better support for mobile devices.

• IPv4 uses 32-bit addresses, while IPv6 uses 128-bit addresses

• IPv6 has a hierarchical addressing structure, allowing for more efficient routing

• IPv6 includes built-in security features, such as IPsec

• IPv6 has better support for mobile devices, with features like mobile IP and flow labeling

VLAN is a virtual LAN that divides a physical network into multiple logical networks. EBGP and IBGP are different types of BGP routing protocols. OSPF is a link-state routing protocol.

• VLAN stands for Virtual Local Area Network and is used to segment a network into multiple smaller networks for better traffic management.

• EBGP (External BGP) is used between different autonomous systems, while IBGP (Internal BGP) is used within the same autonomous system.

• OSPF (Open Shortest Path ...read more

MPLS is a protocol used for efficient data transfer. DNS is a system that translates domain names to IP addresses. Subnetting is dividing a network into smaller subnetworks.

• MPLS stands for Multiprotocol Label Switching and is used to route network traffic efficiently.

• DNS stands for Domain Name System and is used to translate domain names to IP addresses.

• Subnetting is the process of dividing a network into smaller subnetworks to improve network performance and security.

• MPLS is...read more

Answers to various networking questions related to VLANs, BGP, SSH, Telnet, and OSPF.

• VLANs are used to segment a network into separate broadcast domains.

• EBGP (External BGP) is used between different AS (Autonomous Systems), while IBGP (Internal BGP) is used within the same AS.

• BGP uses the 'AD value' (Administrative Distance) to determine the best path to a destination.

• SSH (Secure Shell) uses port number 22 for secure remote access.

• Telnet uses port number 23 for unencrypted re...read more

BGP attributes and route reflect

• BGP attributes are used to determine the best path for routing traffic

• Attributes include AS path, next hop, local preference, and more

• Route reflect is a BGP feature that allows for efficient route distribution in large networks

• It reduces the number of BGP peerings required by reflecting routes from one set of routers to another

A diode is an electronic component that allows current to flow in only one direction.

• It has two terminals, an anode and a cathode.

• It is commonly used in rectifiers to convert AC to DC.

• It can also be used as a voltage regulator or a signal modulator.

• Examples include the 1N4148 and the 1N4001 diodes.

DNS stands for Domain Name System, it translates domain names to IP addresses.

• DNS is like a phone book for the internet, translating domain names (like google.com) to IP addresses (like 172.217.3.206).

• DNS works by sending queries to a series of servers, starting with the local DNS resolver and moving up to authoritative DNS servers.

• DNS uses a hierarchical system with multiple levels of servers, including root servers, top-level domain servers, and authoritative servers.

• DNS ca...read more

A router is a networking device that forwards data packets between computer networks, while a switch is a networking device that connects devices within a network.

• Routers operate at the network layer (Layer 3) of the OSI model, while switches operate at the data link layer (Layer 2).

• Routers use IP addresses to route traffic between different networks, while switches use MAC addresses to forward data within a network.

• Routers can connect multiple networks together, while switch...read more

BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different autonomous systems.

• BGP is an exterior gateway protocol used in large-scale networks.

• It allows routers in different autonomous systems to communicate and exchange routing information.

• BGP uses path vector routing, which takes into account multiple factors to determine the best path for data transmission.

• BGP assigns an administrative distance (AD) value to each route, which...read more

Switch congestion occurs when a network switch is overwhelmed with traffic, leading to delays or dropped packets.

• Switch congestion can occur when there is a high volume of data being transmitted through the switch

• It can lead to delays in data transmission or even dropped packets

• Switch congestion can be alleviated by implementing Quality of Service (QoS) policies or upgrading to higher capacity switches

Modem type in refers to the process of configuring a modem to connect to a network.

• Modem type in involves setting up the modem to establish a connection with a network.

• It includes configuring the modem's settings such as IP address, subnet mask, and default gateway.

• Examples of modem types include DSL modems, cable modems, and wireless modems.

OSPF (Open Shortest Path First) is a routing protocol used in computer networks to determine the best path for data packets to travel.

• OSPF is an interior gateway protocol (IGP) used within a single autonomous system (AS).

• It uses the link-state routing algorithm to calculate the shortest path between routers.

• OSPF divides the network into areas to improve scalability and reduce routing overhead.

• Each area has its own link-state database and routers within an area have the same a...read more

OSPF areas are used to divide a network into smaller segments for better routing efficiency and scalability.

• OSPF areas are logical groupings of routers and networks within an OSPF autonomous system.

• Each area has its own Area ID, which is a 32-bit number used to identify the area.

• Area 0 is known as the backbone area and must be present in every OSPF network.

• Areas other than Area 0 are called non-backbone areas.

• OSPF routers within the same area have full routing information abo...read more

Wireless refers to the transmission of data without the use of physical cables or wires.

• Wireless technology uses radio waves to transmit data over a network.

• Examples of wireless technology include Wi-Fi, Bluetooth, and cellular networks.

• Wireless networks are convenient for mobile devices and allow for greater flexibility in connectivity.

Wireless device configuration involves setting up and managing wireless networks for optimal performance.

• Understand the network requirements and goals

• Select appropriate wireless devices and access points

• Configure SSIDs, security settings, and encryption protocols

• Optimize placement of access points for coverage and performance

• Monitor and troubleshoot network performance

Daily routine involves monitoring network performance, troubleshooting issues, implementing upgrades, and collaborating with team members.

• Monitor network performance and security

• Troubleshoot network issues

• Implement network upgrades and configurations

• Collaborate with team members on projects and tasks

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

• The OSI model stands for Open Systems Interconnection model

• It helps in understanding how different networking protocols work together

• The seven layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application

• Each layer has specific functions and communicates with adjacent layers