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ComptiaNetwork+ Network Concepts


Master ComptiaNetwork+ Network Concepts with our interactive study cards designed for effective learning. These flashcards use proven spaced repetition techniques to help you memorize key concepts, definitions, and facts. Perfect for students, professionals, and lifelong learners seeking to improve knowledge retention and ace exams through active recall practice.


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What are the 7 layers of the OSI model from bottom to top?

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Answer:

Physical Data Link Network Transport Session Presentation Application

What is the function of the Physical layer?

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Answer:

Transmits raw bits over physical medium and defines hardware specifications

What is the function of the Data Link layer?

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Answer:

Provides node-to-node data transfer error detection and MAC addressing

What is the function of the Network layer?

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Answer:

Handles logical addressing routing and packet forwarding

What is the function of the Transport layer?

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Answer:

Provides reliable or unreliable delivery and manages end-to-end connections

What is the function of the Session layer?

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Answer:

Establishes manages and terminates sessions between applications

What is the function of the Presentation layer?

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Answer:

Handles data formatting encryption and compression

What is the function of the Application layer?

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Answer:

Provides network services directly to end-user applications

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What protocols operate at Layer 7 (Application)?

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Answer:

HTTP HTTPS FTP SMTP DNS DHCP and SNMP

What protocols operate at Layer 4 (Transport)?

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Answer:

TCP and UDP

What protocol operates at Layer 3 (Network)?

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Answer:

IP (Internet Protocol) and ICMP

What operates at Layer 2 (Data Link)?

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Answer:

Switches bridges and MAC addresses

What operates at Layer 1 (Physical)?

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Answer:

Hubs repeaters cables and physical media

What is TCP?

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Answer:

Transmission Control Protocol - connection-oriented reliable protocol

What is UDP?

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Answer:

User Datagram Protocol - connectionless unreliable but faster protocol

What is the three-way handshake?

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Answer:

TCP connection establishment using SYN SYN-ACK and ACK packets

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What port does HTTP use?

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Answer:

Port 80

What port does HTTPS use?

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Answer:

Port 443

What port does FTP use?

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Answer:

Ports 20 (data) and 21 (control)

What port does SSH use?

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Answer:

Port 22

What port does Telnet use?

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Answer:

Port 23

What port does SMTP use?

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Answer:

Port 25

What port does DNS use?

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Answer:

Port 53 (UDP for queries TCP for zone transfers)

What port does DHCP use?

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Answer:

Ports 67 (server) and 68 (client)

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What port does TFTP use?

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Answer:

Port 69

What port does POP3 use?

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Answer:

Port 110

What port does IMAP use?

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Answer:

Port 143

What port does SNMP use?

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Answer:

Ports 161 (agent) and 162 (trap)

What port does RDP use?

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Answer:

Port 3389

What is an IPv4 address?

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Answer:

32-bit address written as four octets in dotted decimal notation

What are the IPv4 address classes?

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Answer:

Class A (1-126) Class B (128-191) Class C (192-223) Class D (multicast) Class E (experimental)

What is a Class A default subnet mask?

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Answer:

255.0.0.0 or /8

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What is a Class B default subnet mask?

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Answer:

255.255.0.0 or /16

What is a Class C default subnet mask?

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Answer:

255.255.255.0 or /24

What is a private IP address range for Class A?

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Answer:

10.0.0.0 to 10.255.255.255

What is a private IP address range for Class B?

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Answer:

172.16.0.0 to 172.31.255.255

What is a private IP address range for Class C?

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Answer:

192.168.0.0 to 192.168.255.255

What is the loopback address?

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Answer:

127.0.0.1 used for testing local network stack

What is APIPA range?

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Answer:

169.254.0.0 to 169.254.255.255 - automatic addressing when DHCP fails

What is an IPv6 address?

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Answer:

128-bit address written as eight groups of four hexadecimal digits

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What is the IPv6 loopback address?

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Answer:

::1

What is a link-local IPv6 address?

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Answer:

Address starting with FE80:: used for local network communication

What is subnetting?

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Answer:

Dividing a network into smaller sub-networks for better management and security

What is CIDR notation?

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Answer:

Classless Inter-Domain Routing notation using slash followed by prefix length (e.g. /24)

What is a MAC address?

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Answer:

48-bit physical address burned into network interface cards

How is a MAC address written?

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Answer:

Six groups of two hexadecimal digits separated by colons or hyphens

What is ARP?

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Answer:

Address Resolution Protocol - maps IP addresses to MAC addresses

What is a broadcast address?

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Answer:

Special address used to send data to all devices on a network

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What is a unicast transmission?

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Answer:

One-to-one communication between two devices

What is a multicast transmission?

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Answer:

One-to-many communication to a specific group of devices

What is a broadcast transmission?

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Answer:

One-to-all communication to every device on the network segment

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