Networking Devices Flashcards Preview

CompTIA N10-007 Network+ > Networking Devices > Flashcards

Flashcards in Networking Devices Deck (9)
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1
Q

Hub

A

• “Multi-port repeater”
• Traffic going in one port is repeated to every other
port
• OSI Layer 1

  • Everything is half-duplex
  • Becomes less efficient as network speeds increase
  • 10 megabit / 100 megabit
  • Difficult to find today
2
Q

Bridge

A
  • Imagine a switch with two to four ports
    • Makes forwarding decisions in software

• Connects different physical networks
• Can connect different topologies
• Gets around physical network size limitations /
collisions

  • OSI Layer 2 device
    • Distributes traffic based on MAC address
  • Most bridges these days are wireless access points
    • Bridges wired Ethernet to wireless
3
Q

Switch

A
  • Bridging done in hardware
    • Application-specific integrated circuit (ASIC)
  • An OSI layer 2 device
    • Forwards traffic based on data link address
  • Many ports and features
    • The core of an enterprise network
    • May provide Power over Ethernet (PoE)
  • Multilayer switch
    • Includes Layer 3 (routing) functionality
4
Q

Router

A
• Routes traffic between IP subnets
  • OSI layer 3 device
  • Routers inside of switches sometimes called “layer 3 
     switches”
  • Layer 2 = Switch
  • Layer 3 = Router
  • Often connects diverse network types
    • LAN, WAN, copper, fiber
5
Q

Firewall

A
  • Filters traffic by port number
    • OSI layer 4 (TCP/UDP)
    • Some firewalls can filter through OSI layer 7
  • Can encrypt traffic into/out of the network
    • Protect your traffic between sites
  • Can proxy traffic
    • A common security technique
  • Most firewalls can be layer 3 devices (routers)
    • Usually sits on the ingress/egress of the network
6
Q

Wireless access point (WAP)

A

• Not a wireless router
• A wireless router is a router and a WAP in a single
device

• WAP is a bridge
• Extends the wired network onto the wireless
network
• WAP is an OSI layer 2 device

7
Q

Converting media

A
  • OSI Layer 1
    • Physical layer signal conversion
  • Extend a copper wire over a long distance
    • Convert it to fiber, and back again
  • You have fiber
    • The switch only has copper ports
  • Almost always powered
    • Especially fiber to copper
8
Q

Wireless range extender

A

• Wireless never seems to stretch far enough
• We can’t always choose where to install an access
point

  • Extend the reach of a wireless network
    • A wireless repeater
9
Q

VoIP endpoint

A
  • Some people still communicate using voice
    • We now send this using VoIP

• The device can now be anything
• Traditional phone handset, desktop application,
mobile device app

Decks in CompTIA N10-007 Network+ Class (86):