CompTIA Network+ Networking Fundamentals 1 — Questions and Answers

Question 1: What is the purpose of the OSI model?

To define how devices on a network authenticate users
To establish a universal standard for network communication (Correct answer)
To allocate IP addresses to devices on a network
To encrypt data for secure transmission

Correct answer: To establish a universal standard for network communication

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven distinct layers. Its purpose is to allow different systems to communicate by providing a common reference for how network protocols should interact, promoting interoperability across diverse network technologies and vendors.

Question 2: Which of the following is a valid IPv4 address?

192.168.256.1
10.0.0.1 (Correct answer)
172.16.500.5
300.300.300.300

Correct answer: 10.0.0.1

An IPv4 address consists of four octets (groups of 8 bits) separated by dots, where each octet can range from 0 to 255. Options A, C, and D contain numbers greater than 255 in at least one octet, making them invalid. 10.0.0.1 adheres to the 0-255 rule for all its octets, making it a valid IPv4 address within the private IP address range.

Question 3: Which protocol is used for secure web communication?

HTTP
HTTPS (Correct answer)
FTP
SMTP

Correct answer: HTTPS

HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP, the protocol over which data is sent between your browser and the website you are connecting to. It encrypts communication using SSL/TLS, protecting data integrity and confidentiality, which is crucial for secure web transactions, sensitive information, and preventing eavesdropping.

Question 4: What is the primary function of a subnet mask?

To assign IP addresses to devices
To identify the network and host portions of an IP address (Correct answer)
To provide encryption for data packets
To enable devices to resolve domain names

Correct answer: To identify the network and host portions of an IP address

A subnet mask works in conjunction with an IP address to divide it into two parts: the network portion and the host portion. This division allows devices on a network to determine if a destination IP address is on the same local network or if it needs to be routed through a gateway to a different network, facilitating efficient data delivery.

Question 5: What type of topology connects all devices to a single central device, such as a switch?

Star (Correct answer)
Bus
Ring
Mesh

Correct answer: Star

In a star topology, all network devices connect to a single central device, such as a switch or hub. This central connection point relays data between all connected nodes. This design simplifies troubleshooting and makes network expansion easier, as a failure in one device does not affect the entire network.

CompTIA Network+ Networking Fundamentals 1

What is the purpose of the OSI model?