FREE DOD Network & Systems Administration Questions and Answers

Question 1

What is the primary role of a network administrator?

Accepted Answer

To install and configure networking hardware and software.

Answer

A network administrator's core responsibility involves setting up and maintaining an organization's computer networks. This includes installing and configuring network devices like routers, switches, and firewalls, as well as managing network operating systems and software. Their work ensures reliable and secure network operations for all users.

Question 2

What is the purpose of a subnet mask in a network?

Accepted Answer

It specifies the size of the network and distinguishes network and host portions.

Answer

A subnet mask works in conjunction with an IP address to define which part of the IP address identifies the network and which part identifies the specific host within that network. By doing so, it effectively divides a larger network into smaller, more manageable subnets. This allows for efficient routing of data packets and better organization of network resources.

Question 3

What does TCP/IP stand for?

Accepted Answer

Transmission Control Protocol/Internet Protocol.

Answer

TCP/IP is the foundational suite of communication protocols used for the internet and most computer networks. TCP (Transmission Control Protocol) manages the reliable delivery of data, ensuring packets arrive in order and without errors. IP (Internet Protocol) handles the addressing and routing of data packets across different networks.

Question 4

What is DNS (Domain Name System)?

Accepted Answer

It translates domain names into IP addresses.

Answer

The Domain Name System (DNS) acts like the internet's phonebook, translating human-readable domain names (like google.com) into machine-readable IP addresses (like 172.217.160.142). This translation is crucial because computers communicate using IP addresses, while humans find domain names easier to remember. Without DNS, users would have to type complex IP addresses to access websites.

Question 5

What is a firewall?

Accepted Answer

A software that prevents unauthorized access to a network.

Answer

A firewall is a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary function is to block malicious traffic and prevent unauthorized access, thereby protecting network resources.

DOD - Department of Defense Certified Practice Test

DOD - Department of Defense Certified Practice Test

FREE DOD Network & Systems Administration Questions and Answers