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CompTIA Network+ > Chapter 11 - Supplement - Sheet1 > Flashcards

Chapter 11 - Supplement - Sheet1 Flashcards

1
Q

Benefits of layer 2 switching

A

Hardware-based bridging (ASIC), Wire speed, low latency, low cost

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2
Q

ASIC

A

Application-specific integrated circuits. Switches make decisions based on ASIC chips (hardware) instead of software, like how bridges operate

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3
Q

Limitations of Layer 2 Switching

A

Switches don’t break up broadcast domains, only collision domains

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4
Q

Three functions of layer 2 switching

A

Address learning, forward/filter decisions, loop avoidance

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5
Q

Address Learning

A

Switches build a forward/filter table of MAC addresses from the source field of packets sent to them.

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6
Q

Two version of the IEEE Spanning Tree Protocol

A

802.1D, 802.1w

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7
Q

5 problems that can affect data as it traverses network cable

A

Delay, Dropped Packets, Error, Jitter, Out-of-order delivery

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8
Q

Access Ports

A

Belongs to and carries the traffic of only one VLAN

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9
Q

Trunk Ports

A

Carries multiple VLANs at a time

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10
Q

Trunk Link

A

100Mbps or 1000Mbps point-to-point link between two switches, between a switch and a router, or between a switch and a server.

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11
Q

Max VLANS trunk links can carry traffic for

A

4094

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12
Q

Two VLAN identification methods

A

ISL, 802.1q

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13
Q

ISL

A

VLAN ID method. Inter-Switch Link - Encapsulates the data frame with its own header (that has a VLAN ID) and a CRC. Proprietary to Cisco. Fast Ethernet and Gigabit Ethernet only

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14
Q

IEEE 802.1Q

A

VLAN ID method. Inserts a field into the frame to ID the VLAN.

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15
Q

VTP

A

VLAN Trunking Protocol. Allows for management of VLANs throughout the network via a server or central switch

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16
Q

Default VTP mode for switches

A

VTP Server

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17
Q

VTP modes

A

Server, client, transparent

18
Q

PoE

A

Power over ethernet

19
Q

PoE IEE standard

A

802.3.af

20
Q

PoE Plus

A

POE with more power

21
Q

PoE Plus IEEE standard

A

802.3at

22
Q

Port Mirroring

A

AKA SPAN (Switch Port Analyzer). Allows you to simulate a port on a switch from another point on the switch, which anables traffic sniffing of data going out a specific port

23
Q

STP

A

Spanning tree protocol.

24
Q

Main purpose of STP

A

Prevent switching lops in a network with redundant switched ports

25
Q

States of STP

A

Blocking, Listening, Learning, Forwarding, Disabled

26
Q

Blocking State STP

A

Preent the use of looped paths

27
Q

Listening State STP

A

Prepared to forward data frames without populating the MAC address table

28
Q

Learning State STP

A

Populates the MAC address table but doesn’t forward data frames

29
Q

Forwarding State STP

A

Sends and received all data frames on a bridged port

30
Q

Disabled State STP

A

Virtually nonooperational.

31
Q

VLANs break up ________ domains in a Layer 2 switched network.

A

Broadcast

32
Q

Switches, by default, only break up ________ domains.

A

Collission

33
Q

What does trunking provide?

A

Allows you to send information about many or all VLANs through the same link.

34
Q

You need to power a device such as an access point or IP phone. What protocol can provide power to these devices over an Ethernet cable?

A

PoE

35
Q

You plug a host into a switch port and the host receives an IP address but the user can’t get to the services it needs. What is probably the problem?

A

VLAN port membership could be wrong

36
Q

If a destination MAC address is not in the forward/filter table, what will the switch do with the frame?

A

Flood the frame out all ports except the port on which it was received

37
Q

What are the three switch functions at Layer 2?

A

Address learning, filtering, and loop avoidance

38
Q

If a frame is received on a switch port and the source MAC address is not in the forward/filter table, what will the switch do?

A

It will add the source MAC address to the forward/filter table

39
Q

What is used at Layer 2 to prevent switching loops?

A

Spanning tree protocol.

40
Q

You need to implement a separate network for contractors and guests working at your office. Which technology should you implement?

A

Create a VLAN for contractors and another for guests

CompTIA Network+ (30 decks)

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