A+ 220-801 Objective 2.9: Compare and contrast network devices and their functions and features
How does a bridge function?
A bridge is similar to a switch but instead of connecting individual devices, it connects groups of devices. For example, two groups of computers might be connected to each other with two separate hubs. You can then use a bridge to connect the two groups together via the bridge. Even though the two groups are connected, the bridge is selective about what data is forwarded between the two groups of devices.
What is a hub?
A hub is a simple network device used to connect multiple devices together in a network. A hub transmits all data that it receives on one port to all other ports.
What is broadcast traffic?
Broadcast traffic is sent from one device to all other devices on a network. Broadcast traffic is not sent through a router.
What type of messages are not passed through a router/
Broadcast traffic sent to a router is not passed through the router
What is the difference between a network-based firewall and a host-based firewall?
A network-based firewall is often used in conjunction with a router to filter traffic in and out of a network. A host-based firewall is additional software running on a computer for additional security protection.
What network device evaluates the IP address of traffic and determines the best path to send it to get to its destination.
A router
What is the difference between a hub and a switch?
A switch transmits data that it receives to specific ports. A hub transmits data out all other ports.
What is the difference between a WAP and a wireless router?
An access point provides connectivity only for wireless clients to other wireless clients and to a wired network. However, a wireless router includes multiple other components, such as RJ-45 connections for wired clients, and a WAN connection for internet access.
What type of calls can be made with VoIP phones?
As long as you have Internet access, you can use the VoIP phone to make telephone calls, including long-distance calls.
What additional protocols are often included on routers used in a SOHO?
DHCP and NAT
What type of device blocks all traffic unless a rule is created to allow the traffic?
Firewalls block all traffic unless an exception or rule is created to allow the traffic.
What type of connector does an internal modem use?
Internal modems use RJ-11 connections to connect to the phone line.
What is the purpose of an Internet appliance?
Internet appliances are small devices used to access the Internet for web browsing or email access. Many of the features of an Internet appliance are included with mobile devices such as smartphones and tablets.
What type of device is used to connect to a dial-up ISP?
Modems are used for dial-up Internet connections.
What philosophy do most firewall use?
Most firewalls use an implicit deny philosophy with exceptions. That is, all traffic is blocked (denied) unless a rule or exception has been created to allow it.
What is Multicast traffic?
Multicast traffic is sent from one device to multiple other devices.
What is the primary purpose of a NAS?
Network attached storage (NAS) is a dedicated computer system used to provide disk storage on a network.
What are routers used for?
Routers are used to connect networks or subnets together. In general, the networking devices are connected together with a switch or a hub in a network, and multiple networks are connected together with a router.
What type of network device would include NAT?
Routers used to connect to the Internet commonly include NAT to translate public and private IP addresses. In many cases, the router also includes firewall capabilities.
How does a switch determine where to send traffic?
Switches learn which devices are connected to which physical port by analyzing traffic that comes into the port. They build an internal table mapping the physical port number with the MAC address. They then send unicast traffic only to the specific port where the MAC address is used.
What is a benefit of a switch over a hub?
Switches provide performance improvements because each device connected to the switch uses a separate segment, resulting in less traffic for each segment. Also, switches provide some security because traffic is not sent to all devices connected to the switch
What is Unicast traffic?
Unicast traffic is sent from one device and addressed to one other device. Even though unicast traffic is addressed to only one device, the hub still forwards unicast traffic to all other devices connected to the hub.
What can most firewalls filter traffic based on?
• Ports • IP addresses • Network IDs • Protocols
