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CompTIA A+ cert 1 > 2.2 Network Devices > Flashcards

2.2 Network Devices Flashcards

1
Q

What does a router do? (2 parts)

A
  • Routes traffic between IP subnets

- makes forwarding decisions based on IP addresses

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2
Q

What do switches do?

A
  • forward traffic received based on data-link address

- an example of a bridge

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3
Q

What is a more modern and advanced example of a bridge?

A

A switch

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4
Q

What is a benefit of using switches? (hint - Arago note)

A

they improve network performance by dividing a given network segment into separate collision points

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5
Q

Difference between managed vs unmanaged switches

A

Unmanaged: - few config. options

  • no VLAN options
  • little to no integration with other devices
  • low price point

Managed: -traffic prioritization

  • external management (SNMP)
  • post-mirroring m- capture packets
  • higher price point
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6
Q

What kind of traffic gets highest priority in a managed switch?

A

Voice traffic

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7
Q

What is the general function of an access point?

A

To provide a WiFi signal when a reliable signal from a wireless router is not available

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8
Q

What is the difference between a wireless router and a wireless access point?

A

A wireless router may or may not be able to connect to the internet; while a wireless access point can either provide a reliable connection when the router cannot provide a sufficient connection, or when the router has no WiFi connectivity.

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9
Q

What sort of network can a cloud-based network controller be used to control?

A

A wireless LAN

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10
Q

How do firewalls filter traffic?

A

By port #

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11
Q

What layer do firewalls operate on?

A

OSI Layer 4

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12
Q

How does a firewall protect traffic between websites?

A

By encrypting traffic in and out of network.

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13
Q

What happens when traffic passed through a proxy?

A

The proxy receives a request to send traffic to a client, check that client, then sends it over to you.

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14
Q

Where on a network’s infrastructure does a firewall usually sit?

A

Ingress/egress

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15
Q

What is the component that every network device needs to connect to the internet?

A

A network interface card (NIC)

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16
Q

What does a repeater do, and how does it help network functionality?

A

Repeater receives signal, then regenerates it and resends it from another interface (or port); this helps extend the maximum distance that a network can operate over.

17
Q

Does a repeater make forwarding decisions?

A

No.

18
Q

A hub functions as a multi port ________ ?

A

Repeater

19
Q

What happens when a hub receives traffic from any port?

A

Signal is repeated to every other port.

20
Q

What does it mean when a hub is “half-duplex”?

A

Only one device can communicate over the hub at a time.

21
Q

What are the two speeds a hub might operate at?

A
  • 10 mbps

- 100 mbps

22
Q

What do bridges do when they receive traffic?

A

Decide where to route traffic based on it’s destination.

23
Q

What identifier does a bridge use to determine where and in what order it should route traffic?

A

MAC address

24
Q

What protocol does a cable/DSL modem use to receive and route internet traffic?

A

Data Over Cable Service Interface Specification (DOCSIS)

25
Q

What does it mean for a cable/DSL network to be “broadband”?

A

The network is transmitted across multiple frequencies, with different traffic types.

26
Q

What does DSL stand for? What topology does it use to transmit data?

A

Digital Subscriber Line ; telephone lines

27
Q

What sort of DSL network has faster download speed than upload speed? What is a common download and upload rate?

A

Asymmetric Digital Subscriber Line ; 52 Mbits/s downstream / 16 Mbit/s upstream

28
Q

How far is the limit of the distance a DSL can be from the central office?

A

~10,000 feet

29
Q

What is the function of a Patch Panel?

A

A patch panel connects all network cables for all devices in a certain area that are connected to a network.

30
Q

What is the function of a 110 block?

A

The patch panel terminates all of the cable wires connected to it onto the 110 block.

31
Q

What it each port on a 110 Block called?

A

An RJ45 connector.

32
Q

What is another term for a 110 block?

A

A punch-down block

33
Q

Can you easily remove a punched down cable from the punch-down block?

A

No.

34
Q

What is PoE, what devices can it possibly power and where is it most useful?

A

Power over Ethernet - power is provided over ethernet cable ; can power phones, cameras and WAPs ; useful in hard to power areas.

35
Q

What is EoP and what is another term for it?

A

Ethernet over Power - extends ethernet network using power cables to provide service ; also called Power-line Communication

36
Q

What IEEE standard does EoP use, and what speed does it typically operate at?

A

IEEE Standard 1901 ; 500 Mbps

CompTIA A+ cert 1 (12 decks)

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