1.2 Network Devices

What is a router?

Routes traffic between IP subnets, connecting diverse network types.

What OSI layer device is a router?

Layer 3.

What types of diverse network types do routers work with?

LAN, WAN, copper, and fiber.

What is a switch?

Device that connects multiple devices together.

What is a multi-layer switch?

Includes layer 3 functionality (routing).

What are firewalls?

Filter traffic by port number or application.

What are the two types of firewalls?

Traditional and Next-Generation Firewall (NGFW).

What do Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) do?

Watch network traffic.

What are intrusions?

Exploits against operating systems and applications.

What are detections?

Alarms or alerts.

What are preventions?

Stop it before it gets into the network.

What is a load balancer?

Distributes the load of the site users across multiple servers.

What are proxies?

They sit between the users and the external network and take users’ requests and send the requests on their behalf.

Why are proxies useful?

Caching information, access control, URL filtering, and content scanning.

What is a network attached storage (NAS)?

Connects to a shared storage device across the network.

What level is network attached storage?

File-level access.

What is storage area network (SAN)?

Network that provides network access to storage devices.

What level is storage area network (SAN) on?

Block-level access.

What are access points (AP)?

Used for wireless communciation.

What layer device is an access point (AP)?

AP is an OSI layer 2 device.

Why should the network be invisible to your users?

Seamless network access to users regardless of role.

What is a wireless LAN controller?

Centralized management of access points.

Why can a wireless LAN controller do?

Deploy new access points, performance and security monitoring, configure and and deploy changes to all sites, and report an access point use.