Ch 6 Connectivity Devices

A Hub operates at which layer of the OSI model?

1 (Physical)

Repeater or Extender operates at which layer of the OSI model?

1 (Physical)

A Bridge operates at which layer of the OSI model?

2 (Data-Link)

A Switch operates at which layer of the OSI model?

2 (Data-Link)

A Router operates at which layer of the OSI model?

3 (Network)

A very simple device that possesses no real intelligence It is used to link several computers together. It simply repeats any signal that comes in on one port and copies it to the other ports ( a process called broadcasting). Works at the physical layer (layer one) of the OSI model. There are two types active and passive. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

A

Which type of hub can be used to extend the length of the network?

Active

A small powered device that receives a signal amplifies it and sends it on its way. The whole purpose of this device is to extend the functional distance of a cable run. For example you know that UTP (Unshielded Twisted Pair) is limited to 100 meters but what if you need to make a cable run that is 160 meters long. You could run two lengths of cable with this device in the center and it would work. Works at the physical layer (Layer One) of the OSI model. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

B

Which of the following are key features of routers? A they are rack mounted B connect multiple networks to each other (which no other devices do) C Do not forward broadcasts D normally used to connect one LAN to another.

Bcd

Technically speaking this device is any point that allows a user on to a network. Commonly lets users connect to your network via an 802.11 technology. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

C

Used to connect to the internet using plain old phone lines and a dial-up connection. Can also be used for cable internet. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

D

This device is essentially a large hub that is rack mounted. It houses multiple cable connections but possesses no network intelligence. Its sole purpose is to connect cables together. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

E

Operates in the Data Link layer (Layer 2) of the OSI model. It joins similar topologies and is used to divide network segments into multiple collision domains. This device isolates network traffic, preventing unwanted traffic from entering a segment when there are no recipents on that segment. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

F

Operates at the Data Link layer (Layer 2) of the OSI model. Provides centralized connectivity. Examines the layer 2 header of a incoming packet and forwards it properly to the right port and only that port. It's only downside is that it forwards broadcasts because they are addressed to everyone. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

G

Highly intelligent device that connects multiple network types and determines the best path for sending data. It can route packets across multiple networks and uses a routing table to store network addresses to determine the best destination. Operate at the Network Layer (Layer 3) of the OSI model. A Hub B Repeater or Extender C Access Point D Modem E Patch Panel F Bridge G Switch H Router

H

Active hubs use electronics to amplify and clean up the signal before it is passed to the other ports. T or F

T

Ethernet over power allows you to use electrical wiring and outlets as network connections. T or F

T

Passive hubs connect all ports electrically but do not have their own power source. T or F

T

Power over Ethernet (PoE) allows you to run electricity over network cables. T or F

T