Network Devices

Question 1

Hub

Answer 1

• Multi-port repeater
• Traffic going into one port is repeated
to every other port

Question 2

Switch

Answer 2

• Bridging done in hardware

* Forwards traffic based on data link address

Question 3

Router

Answer 3

• Routes traffic between IP subnets
• Forwards traffic based on network address
• Routers inside of switches sometimes
called “layer 3 switches”

Question 4

Wireless access point (WAP)

Answer 4

Bridges from wired network to wireless

• Makes forwarding decisions based on MAC address

Question 5

Modem

Answer 5

Modulator/Demodulator

• Converts analog sounds to digital signals

Question 6

Firewall

Answer 6

Filters traffic by IP, port number, or application

Question 7

Patch panels

Answer 7

Punch-down blocks and RJ-45 connectors
• Runs from desks are made once
• Patch panel to switch can be easily changed

Question 8

Copper line drivers and extenders

Answer 8

Extend the range of copper wire
• Used with serial links, copper Ethernet
• Powered device, regenerates the signal

Question 9

PLC (Power Line Communication)

Answer 9

May be marketed as Ethernet over Power (EOP)

• 500 megabits per second

Question 10

PoE (Power over Ethernet)

Answer 10

One wire for both network and electricity
• Built-in power - Endspans
• In-line power injector - Midspans