Network+ N10-009 Exam Questions and Answers Latest 2025
Layer 1 - Physical:
Receives the frames and data and sends them via the local media (copper
wires, fiber-optic cables, etc.) to the switches, routers, etc., along the
network path.
Layer 2 - Data link:
- Receives the packets and adds physical addressing by adding sender and
receiver MAC addresses to each data packet.
- This information forms a unit called a frame.
Layer 3 - Network:
The routing layer (IP addresses, routers, packets).
Layer 4 - Transport:
The functions defined in this layer provide for the reliable transmission
of data segments, as well as the disassembly and assembly of the data
before and after transmission.
Layer 5 - Session:
, Network+ N10-009 Exam Questions and Answers Latest 2025
- Establishes, manages, and terminates sessions between two communicating
hosts.
- Synchronizes dialog between the presentation layers of the two hosts and
manages their data exchange.
Layer 6 - Presentation:
- Ensures that info sent at application layer of one system is readable by
the application layer of another system.
- May translate between multiple data formats by using a common format.
Layer 7 - Application:
- Closest to the user.
- Provides network services to the applications of the user, such as email,
file transfer, and terminal emulation.
Router:
A device that forwards data packets between computer networks.
Switch:
, Network+ N10-009 Exam Questions and Answers Latest 2025
A computer networking device that connects network segments.
Firewall:
A part of a computer system or network that is designed to block
unauthorized access while permitting outward communication.
Intrusion detection system (IDS):
Monitors network traffic to identify possible malicious activity and log
information about it.
Intrusion prevention system (IPS):
Sits behind the firewall and uses anomaly detection or signature-based
detection to identify and respond to network threats.
Load Balancer:
Hardware or software that balances the load between two or more servers.
Proxy:
A system or router that provides a gateway between users and the internet.
Network-attached storage (NAS):
A server that is placed on a network with the sole purpose of providing
storage to users, computers, and devices attached to the network.
, Network+ N10-009 Exam Questions and Answers Latest 2025
Storage area network (SAN):
A high-speed network with the sole purpose of providing storage to other
attached servers.
Wireless Access point (AP):
A device that enables wireless systems to communicate with each other,
provided that they are on the same network.
Wireless Controller:
A central management console for all of the APs on a network.
Content delivery network (CDN):
- An information system that serves content to Web pages over the Internet.
- To reduce wait time, data is typically stored and served from many
geographic locations.
Virtual private network (VPN):
A private data network that creates secure connections, or "tunnels," over
regular Internet lines.
Quality of service (QoS):
Policies that control how much bandwidth a protocol, PC, user, VLAN, or IP
address may use.
Layer 1 - Physical:
Receives the frames and data and sends them via the local media (copper
wires, fiber-optic cables, etc.) to the switches, routers, etc., along the
network path.
Layer 2 - Data link:
- Receives the packets and adds physical addressing by adding sender and
receiver MAC addresses to each data packet.
- This information forms a unit called a frame.
Layer 3 - Network:
The routing layer (IP addresses, routers, packets).
Layer 4 - Transport:
The functions defined in this layer provide for the reliable transmission
of data segments, as well as the disassembly and assembly of the data
before and after transmission.
Layer 5 - Session:
, Network+ N10-009 Exam Questions and Answers Latest 2025
- Establishes, manages, and terminates sessions between two communicating
hosts.
- Synchronizes dialog between the presentation layers of the two hosts and
manages their data exchange.
Layer 6 - Presentation:
- Ensures that info sent at application layer of one system is readable by
the application layer of another system.
- May translate between multiple data formats by using a common format.
Layer 7 - Application:
- Closest to the user.
- Provides network services to the applications of the user, such as email,
file transfer, and terminal emulation.
Router:
A device that forwards data packets between computer networks.
Switch:
, Network+ N10-009 Exam Questions and Answers Latest 2025
A computer networking device that connects network segments.
Firewall:
A part of a computer system or network that is designed to block
unauthorized access while permitting outward communication.
Intrusion detection system (IDS):
Monitors network traffic to identify possible malicious activity and log
information about it.
Intrusion prevention system (IPS):
Sits behind the firewall and uses anomaly detection or signature-based
detection to identify and respond to network threats.
Load Balancer:
Hardware or software that balances the load between two or more servers.
Proxy:
A system or router that provides a gateway between users and the internet.
Network-attached storage (NAS):
A server that is placed on a network with the sole purpose of providing
storage to users, computers, and devices attached to the network.
, Network+ N10-009 Exam Questions and Answers Latest 2025
Storage area network (SAN):
A high-speed network with the sole purpose of providing storage to other
attached servers.
Wireless Access point (AP):
A device that enables wireless systems to communicate with each other,
provided that they are on the same network.
Wireless Controller:
A central management console for all of the APs on a network.
Content delivery network (CDN):
- An information system that serves content to Web pages over the Internet.
- To reduce wait time, data is typically stored and served from many
geographic locations.
Virtual private network (VPN):
A private data network that creates secure connections, or "tunnels," over
regular Internet lines.
Quality of service (QoS):
Policies that control how much bandwidth a protocol, PC, user, VLAN, or IP
address may use.
