CompTIA Network+ (N10-009) Exam
Questions and Answers
Layer 1 - Physical: - ANSWER>>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: - ANSWER>>- 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: - ANSWER>>The routing layer (IP addresses, routers, packets).
Layer 4 - Transport: - ANSWER>>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: - ANSWER>>- 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: - ANSWER>>- 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: - ANSWER>>- Closest to the user.
,- Provides network services to the applications of the user, such as email, file
transfer, and terminal emulation.
Router: - ANSWER>>A device that forwards data packets between computer
networks.
Switch: - ANSWER>>A computer networking device that connects network
segments.
Firewall: - ANSWER>>A part of a computer system or network that is designed to
block unauthorized access while permitting outward communication.
Intrusion detection system (IDS): - ANSWER>>Monitors network traffic to identify
possible malicious activity and log information about it.
Intrusion prevention system (IPS): - ANSWER>>Sits behind the firewall and uses
anomaly detection or signature-based detection to identify and respond to
network threats.
Load Balancer: - ANSWER>>Hardware or software that balances the load between
two or more servers.
Proxy: - ANSWER>>A system or router that provides a gateway between users and
the internet.
Network-attached storage (NAS): - ANSWER>>A server that is placed on a
network with the sole purpose of providing storage to users, computers, and
devices attached to the network.
Storage area network (SAN): - ANSWER>>A high-speed network with the sole
purpose of providing storage to other attached servers.
,Wireless Access point (AP): - ANSWER>>A device that enables wireless systems to
communicate with each other, provided that they are on the same network.
Wireless Controller: - ANSWER>>A central management console for all of the APs
on a network.
Content delivery network (CDN): - ANSWER>>- 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): - ANSWER>>A private data network that creates
secure connections, or "tunnels," over regular Internet lines.
Quality of service (QoS): - ANSWER>>Policies that control how much bandwidth a
protocol, PC, user, VLAN, or IP address may use.
Time to live (TTL): - ANSWER>>The maximum amount of time a packet is allowed
to circulate through a network before it is destroyed.
Network functions virtualization (NFV): - ANSWER>>Provisioning virtual network
appliances, such as switches, routers, and firewalls, via VMs and containers.
Virtual private cloud (VPC): - ANSWER>>A private network segment made
available to a single cloud consumer within a public cloud.
Network security groups: - ANSWER>>Allows you to filter network traffic. Can
contain multiple inbound and outbound security rules that enable you to filter
traffic to and from resources.
Network security lists: - ANSWER>>Consists of a set of ingress and egress security
rules that apply to all the VNICs in any subnet that the list is associated with.
, Internet gateway: - ANSWER>>A device or node that connects networks by
translating protocols.
Network address translation (NAT) gateway: - ANSWER>>You can use this so that
instances in a private subnet can connect to services outside your VPC, but
external services cannot initiate a connection with those instances.
Public cloud: - ANSWER>>Provides cloud services to just about anyone.
Private cloud: - ANSWER>>Serves only one customer or organization and can be
located on the customer's premises or off the customer's premises.
Hybrid cloud: - ANSWER>>A mixed computing environment where applications
are run using a combination of computing, storage, and services in different
environments.
Software as a service (SaaS): - ANSWER>>A form of cloud computing where a firm
subscribes to a third-party software and receives a service that is delivered online.
Infrastructure as a service (IaaS): - ANSWER>>Delivers hardware networking
capabilities, including the use of servers, networking, and storage, over the cloud
using a pay-per-use revenue model.
Platform as a service (PaaS): - ANSWER>>Supports the deployment of entire
systems including hardware, networking, and applications using a pay-per-use
revenue model.
Scalability: - ANSWER>>Refers to how well a system can adapt to increased
demands.
Elasticity: - ANSWER>>Refers to the ability of a cloud to automatically expand or
compress the infrastructural resources on a sudden up and down.
Questions and Answers
Layer 1 - Physical: - ANSWER>>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: - ANSWER>>- 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: - ANSWER>>The routing layer (IP addresses, routers, packets).
Layer 4 - Transport: - ANSWER>>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: - ANSWER>>- 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: - ANSWER>>- 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: - ANSWER>>- Closest to the user.
,- Provides network services to the applications of the user, such as email, file
transfer, and terminal emulation.
Router: - ANSWER>>A device that forwards data packets between computer
networks.
Switch: - ANSWER>>A computer networking device that connects network
segments.
Firewall: - ANSWER>>A part of a computer system or network that is designed to
block unauthorized access while permitting outward communication.
Intrusion detection system (IDS): - ANSWER>>Monitors network traffic to identify
possible malicious activity and log information about it.
Intrusion prevention system (IPS): - ANSWER>>Sits behind the firewall and uses
anomaly detection or signature-based detection to identify and respond to
network threats.
Load Balancer: - ANSWER>>Hardware or software that balances the load between
two or more servers.
Proxy: - ANSWER>>A system or router that provides a gateway between users and
the internet.
Network-attached storage (NAS): - ANSWER>>A server that is placed on a
network with the sole purpose of providing storage to users, computers, and
devices attached to the network.
Storage area network (SAN): - ANSWER>>A high-speed network with the sole
purpose of providing storage to other attached servers.
,Wireless Access point (AP): - ANSWER>>A device that enables wireless systems to
communicate with each other, provided that they are on the same network.
Wireless Controller: - ANSWER>>A central management console for all of the APs
on a network.
Content delivery network (CDN): - ANSWER>>- 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): - ANSWER>>A private data network that creates
secure connections, or "tunnels," over regular Internet lines.
Quality of service (QoS): - ANSWER>>Policies that control how much bandwidth a
protocol, PC, user, VLAN, or IP address may use.
Time to live (TTL): - ANSWER>>The maximum amount of time a packet is allowed
to circulate through a network before it is destroyed.
Network functions virtualization (NFV): - ANSWER>>Provisioning virtual network
appliances, such as switches, routers, and firewalls, via VMs and containers.
Virtual private cloud (VPC): - ANSWER>>A private network segment made
available to a single cloud consumer within a public cloud.
Network security groups: - ANSWER>>Allows you to filter network traffic. Can
contain multiple inbound and outbound security rules that enable you to filter
traffic to and from resources.
Network security lists: - ANSWER>>Consists of a set of ingress and egress security
rules that apply to all the VNICs in any subnet that the list is associated with.
, Internet gateway: - ANSWER>>A device or node that connects networks by
translating protocols.
Network address translation (NAT) gateway: - ANSWER>>You can use this so that
instances in a private subnet can connect to services outside your VPC, but
external services cannot initiate a connection with those instances.
Public cloud: - ANSWER>>Provides cloud services to just about anyone.
Private cloud: - ANSWER>>Serves only one customer or organization and can be
located on the customer's premises or off the customer's premises.
Hybrid cloud: - ANSWER>>A mixed computing environment where applications
are run using a combination of computing, storage, and services in different
environments.
Software as a service (SaaS): - ANSWER>>A form of cloud computing where a firm
subscribes to a third-party software and receives a service that is delivered online.
Infrastructure as a service (IaaS): - ANSWER>>Delivers hardware networking
capabilities, including the use of servers, networking, and storage, over the cloud
using a pay-per-use revenue model.
Platform as a service (PaaS): - ANSWER>>Supports the deployment of entire
systems including hardware, networking, and applications using a pay-per-use
revenue model.
Scalability: - ANSWER>>Refers to how well a system can adapt to increased
demands.
Elasticity: - ANSWER>>Refers to the ability of a cloud to automatically expand or
compress the infrastructural resources on a sudden up and down.
