TCS Network Administrator Interview Questions, Process, and Tips

OSPF has three layers: backbone, area, and interface.

• Backbone layer connects all areas and is responsible for routing between them.

• Area layer groups networks together and reduces the amount of routing information exchanged.

• Interface layer connects routers to the network and exchanges routing information within an area.

• OSPF uses a hierarchical structure to efficiently manage large networks.

• Each layer has its own set of ...read more

TCP is a connection-oriented protocol while UDP is a connectionless protocol.

• TCP provides reliable, ordered, and error-checked delivery of data while UDP does not guarantee reliable delivery.

• TCP is slower but more reliable while UDP is faster but less reliable.

• TCP is used for applications that require high reliability and accuracy while UDP is used for applications that require speed and efficiency.

• Examples of TCP-base...read more

Unicast, multicast and broadcast are types of network communication.

• Unicast is a one-to-one communication between a sender and a receiver.

• Multicast is a one-to-many communication where a sender sends data to a group of receivers.

• Broadcast is a one-to-all communication where a sender sends data to all devices on the network.

• Unicast is used for communication that requires privacy and security.

• Multicast is used for stream...read more

Routing is the process of selecting the best path for network traffic to reach its destination.

• Routing involves analyzing network topology and determining the most efficient path for data to travel.

• Routers use routing tables to determine the best path for data to take.

• Routing protocols such as OSPF and BGP are used to exchange routing information between routers.

• Routing can be either static or dynamic, depending on whe...read more

Static routing is a type of network routing where the administrator manually configures the routes in the routing table.

• Routes are manually configured by the network administrator

• Routes do not change unless manually modified

• It is less flexible than dynamic routing

• It is useful for small networks with few changes in topology

• Example: A small office network with a single router connecting to the internet

Static routing uses manually configured routes while dynamic routing uses protocols to automatically update routes.

• Static routing requires manual configuration of routes while dynamic routing uses protocols to automatically update routes.

• Static routing is best suited for small networks with few changes while dynamic routing is better for larger networks with frequent changes.

• Examples of static routing protocols include...read more

NAT stands for Network Address Translation. It is a technique used to map public IP addresses to private IP addresses.

• NAT is used to conserve public IP addresses by allowing multiple devices to share a single public IP address.

• It provides an additional layer of security by hiding the private IP addresses of devices on a network.

• There are three types of NAT: Static NAT, Dynamic NAT, and Port Address Translation (PAT).

• St...read more

Interview questions for Network Administrator role

• Architecture of Firewalls

• Previous role & responsibilities

• Troubleshooting end-user website/server access issues

• Handling latency issues

• Exceptional cases in firewall troubleshooting

• Understanding 3-way handshake

• HSRP and its feasibility with different geolocations

• TCP vs UDP differences

• Understanding ISO OSI model

VPN stands for Virtual Private Network. Protocols are rules that govern data transmission over a network.

• VPN allows users to securely access a private network over a public network like the internet

• Protocols are sets of rules that determine how data is transmitted between devices

• Common VPN protocols include OpenVPN, L2TP/IPsec, and PPTP