Velocis Systems Linux System Administrator Interview Questions and Answers

Q1. What is proxy server?
Ans. 
A proxy server acts as an intermediary between clients and servers, forwarding requests and responses.
• Proxy server acts as a middleman between clients and servers

• It forwards client requests to the appropriate server

• It caches data to improve performance

• It can be used for filtering and blocking certain content

• Examples: Squid, Nginx, Apache HTTP Server
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Q2. What is Dns? What is DHCP? Which port is useing smtp?
Ans. 
DNS is a system that translates domain names into IP addresses. DHCP is a protocol that assigns IP addresses to devices on a network. SMTP uses port 25.
• DNS stands for Domain Name System

• It translates domain names (e.g., www.example.com) into IP addresses (e.g., 192.168.1.1)

• DHCP stands for Dynamic Host Configuration Protocol

• It automatically assigns IP addresses to devices on a network

• SMTP stands for Simple Mail Transfer ...read more
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Q3. What is vpn? Which port use for DNS service?
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VPN stands for Virtual Private Network. It provides a secure and encrypted connection over a public network.
• VPN allows users to access a private network remotely.

• It creates a secure tunnel between the user's device and the network.

• VPN masks the user's IP address and encrypts the data transmitted.

• It is commonly used for remote work, accessing geo-restricted content, and enhancing online privacy.

• Examples of VPN protocols
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Q4. Define colour stright through cable? If os corrupt. How it is resolved?
Ans. 
A color straight through cable is a type of Ethernet cable used to connect devices in a network.
• A color straight through cable is also known as a patch cable or a straight-through cable.

• It is used to connect devices such as computers, switches, and routers in a network.

• The cable has the same pin configuration on both ends, allowing for direct device-to-device connections.

• The color coding of the cable follows the T568A ...read more
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Q1. Data analyst does
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Q2. Data cleaning means
Ans. 
Data cleaning is the process of identifying and correcting errors or inconsistencies in data to improve its quality.
• Removing duplicate entries

• Correcting spelling errors

• Handling missing values

• Standardizing data formats

• Identifying and removing outliers
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Q1. What difference do you bring
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General appitute question

Q1. What is pointer what is array
Ans. 
A pointer is a variable that stores the memory address of another variable. An array is a collection of similar data types.
• Pointers allow for dynamic memory allocation and manipulation.

• Arrays can be one-dimensional or multi-dimensional.

• Example of pointer: int *ptr = # where num is an integer variable.

• Example of array: char str[10] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'};
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Q1. Tell me about your self
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Q1. Most of AD, Server, VWware,
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