Chapter 11 - Supplement - Sheet1 Flashcards Preview

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Flashcards in Chapter 11 - Supplement - Sheet1 Deck (40):
1

Benefits of layer 2 switching

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

2

ASIC

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

3

Limitations of Layer 2 Switching

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

4

Three functions of layer 2 switching

Address learning, forward/filter decisions, loop avoidance

5

Address Learning

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

6

Two version of the IEEE Spanning Tree Protocol

802.1D, 802.1w

7

5 problems that can affect data as it traverses network cable

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

8

Access Ports

Belongs to and carries the traffic of only one VLAN

9

Trunk Ports

Carries multiple VLANs at a time

10

Trunk Link

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

11

Max VLANS trunk links can carry traffic for

4094

12

Two VLAN identification methods

ISL, 802.1q

13

ISL

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

14

IEEE 802.1Q

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

15

VTP

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

16

Default VTP mode for switches

VTP Server

17

VTP modes

Server, client, transparent

18

PoE

Power over ethernet

19

PoE IEE standard

802.3.af

20

PoE Plus

POE with more power

21

PoE Plus IEEE standard

802.3at

22

Port Mirroring

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

STP

Spanning tree protocol.

24

Main purpose of STP

Prevent switching lops in a network with redundant switched ports

25

States of STP

Blocking, Listening, Learning, Forwarding, Disabled

26

Blocking State STP

Preent the use of looped paths

27

Listening State STP

Prepared to forward data frames without populating the MAC address table

28

Learning State STP

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

29

Forwarding State STP

Sends and received all data frames on a bridged port

30

Disabled State STP

Virtually nonooperational.

31

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

Broadcast

32

Switches, by default, only break up ________ domains.

Collission

33

What does trunking provide?

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

34

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?

PoE

35

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?

VLAN port membership could be wrong

36

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

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

37

What are the three switch functions at Layer 2?

Address learning, filtering, and loop avoidance

38

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?

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

39

What is used at Layer 2 to prevent switching loops?

Spanning tree protocol.

40

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

Create a VLAN for contractors and another for guests