Comptia A+ 2020 Networking 2

Front 1

What is a router?

Back 1

A router connects LANs to a WAN

Front 2

What is a switch?

Back 2

A switch connects hosts on a local area network (LAN) and passes signals between them

Front 3

How do switches work?

Back 3

A switch memorizes the MAC address of each device to smartly repeat signals to the appropriate host

Front 4

What is a LAN?

Back 4

a group of networked computers within a few hundred meters of each other

Front 5

What is a WAN?

Back 5

A group of computers on multiple LANs connected with long-distance technologies.

Front 6

What is a managed switch?

Back 6

A managed switch is a switch where each port can be configured with different settings

Front 7

What are two examples of settings can you configure on the port of a managed switch?

Back 7

1. virtual LANs (VLANs)

2. control quality of service (QoS) settings on a per-port basis

Front 8

What is an unmanaged switch?

Back 8

An unmanaged switch is a switch with no management features, and all connected devices are in the same LAN.

Front 9

How does a hub differ from a switch?

Back 9

A hub takes a signal from one port and blindly broadcasts it out the others

Front 10

What is the speed disadvantage of a hub?

Back 10

The total bandwidth is divided by the number of connected devices

Front 11

What is an access point?

Back 11

An access point connects wireless network nodes into a wireless LAN (WLAN)

Front 12

What's another name for an access point?

Back 12

A WAP

Front 13

What is a cloud based network controller?

Back 13

a network appliance that enables the creation and management, of a wireless mesh network

Front 14

How is a cloud based network controller managed?

Back 14

With cloud-based management software.

Front 15

What is a firewall?

Back 15

A firewall protects an internal network from unauthorized access, to and from the Internet at large

Front 16

What is a difference between hardware and software firewalls?

Back 16

Hardware firewalls are built into routers (or standalone devices), software firewalls run on individual systems

Front 17

How does a hardware firewall protect your lan?

Back 17

A hardware firewall filters packets before they reach your internal network

Front 18

What are 2 methods firewalls employ?

Back 18

1. Hiding IP addresses

2. Blocking TCP/IP ports

Front 19

What system does a hardware firewall use to manage incoming traffic?

Back 19

Stateful packet inspection (SPI)

Front 20

What is a NIC?

Back 20

A network interface card

Front 21

What does MAC stand for?

Back 21

media access control

Front 22

How many bit is a mac address

Back 22

48-bit

Front 23

What is the MAC used for?

Back 23

To identify a device on a network

Front 24

What does CRC stand for?

Back 24

Cyclic redundancy check

Front 25

What is CRC used for?

Back 25

A CRC is used to detect data transmission errors

Front 26

What is a purpose of a repeater?

Back 26

A repeater receives and rebroadcasts a Wi-Fi signal

Front 27

What does DSL stand for?

Back 27

digital subscriber line

Front 28

How does a DSL modem work?

Back 28

(DSL) modem connects to a standard RJ-11 telephone line, enabling the conversion of high-speed digital signals to and from the telephone line

Front 29

What is a DSL gateway?

Back 29

DSL modem combined with a wireless router

Front 30

Why does the speed of DSL service vary so greatly?

Back 30

because the greater the distance from the DSL modem to the telephone company’s central switch, the slower the performance

Front 31

How does a cable modem connect?

Back 31

Cable modems use standard RG-6 or RG-59 cable TV lines

Front 32

What is the download speed range for cable?

Back 32

from 6 Mbps to 1+ Gbps

Front 33

What is the upload speed range for cable?

Back 33

1 to 20 Mbps

Front 34

What other optional service is available from cable?

Back 34

VoIP telephony

Front 35

What is a bridge?

Back 35

A bridge connects two different media types (such as UTP and fiber optic) and converts signals between them

Front 36

Describe a patch panel?

Back 36

A patch panel has a row of permanent connectors for horizontal cables on the back, and a row of female port connectors on the front. Short stranded-core UTP patch cables are used to connect the patch panel to the switch

Front 37

What is a patch cable?

Back 37

A patch cable is a specific length (usually short, but can be up to 100 feet) of cable terminated at each end with a plug or socket. Also called a patch cord.

Front 38

What does POE stand for?

Back 38

Power over Ethernet

Front 39

What is POE used for?

Back 39

Advanced APs and networked devices can run on electricity supplied by a Power over Ethernet (PoE) injector or PoE switch

Front 40

What do you call a group of computers connected by one or more switches?

Back 40

a broadcast domain

Front 41

What's the difference between a LAN and a WAN

Back 41

A LAN is a group of networked computers within a few hundred meters of each other, whereas a wide area network (WAN) is a group of computers on multiple LANs connected with long-distance technologies

Front 42

What is a POE injector?

Back 42

It adds power to the Ethernet cable running from the injector to the PoE device

Front 43

What is a POE injector also called?

Back 43

A midspan

Front 44

What's special about a POE switch?

Back 44

It supplies power to PoE devices, but does not supply power to standard Ethernet devices.

Front 45

What is a EoP bridge?

Back 45

It connects UTP cable to your building’s power infrastructure, enabling you to have wired connections where it would be difficult to run new cable