Chapter 11 - Supplement - Sheet1

Question 1

Benefits of layer 2 switching

Answer 1

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

Question 2

ASIC

Answer 2

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

Question 3

Limitations of Layer 2 Switching

Answer 3

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

Question 4

Three functions of layer 2 switching

Answer 4

Address learning, forward/filter decisions, loop avoidance

Question 5

Address Learning

Answer 5

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

Question 6

Two version of the IEEE Spanning Tree Protocol

Answer 6

802.1D, 802.1w

Question 7

5 problems that can affect data as it traverses network cable

Answer 7

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

Question 8

Access Ports

Answer 8

Belongs to and carries the traffic of only one VLAN

Question 9

Trunk Ports

Answer 9

Carries multiple VLANs at a time

Question 10

Trunk Link

Answer 10

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

Question 11

Max VLANS trunk links can carry traffic for

Answer 11

4094

Question 12

Two VLAN identification methods

Answer 12

ISL, 802.1q

Question 13

ISL

Answer 13

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

Question 14

IEEE 802.1Q

Answer 14

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

Question 15

VTP

Answer 15

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

Question 16

Default VTP mode for switches

Answer 16

VTP Server

Question 17

VTP modes

Answer 17

Server, client, transparent

Question 18

PoE

Answer 18

Power over ethernet

Question 19

PoE IEE standard

Answer 19

802.3.af

Question 20

PoE Plus

Answer 20

POE with more power

Question 21

PoE Plus IEEE standard

Answer 21

802.3at

Question 22

Port Mirroring

Answer 22

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

Question 23

STP

Answer 23

Spanning tree protocol.

Question 24

Main purpose of STP

Answer 24

Prevent switching lops in a network with redundant switched ports

Question 25

States of STP

Answer 25

Blocking, Listening, Learning, Forwarding, Disabled

Question 26

Blocking State STP

Answer 26

Preent the use of looped paths

Question 27

Listening State STP

Answer 27

Prepared to forward data frames without populating the MAC address table

Question 28

Learning State STP

Answer 28

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

Question 29

Forwarding State STP

Answer 29

Sends and received all data frames on a bridged port

Question 30

Disabled State STP

Answer 30

Virtually nonooperational.

Question 31

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

Answer 31

Broadcast

Question 32

Switches, by default, only break up ________ domains.

Answer 32

Collission

Question 33

What does trunking provide?

Answer 33

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

Question 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?

Answer 34

PoE

Question 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?

Answer 35

VLAN port membership could be wrong

Question 36

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

Answer 36

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

Question 37

What are the three switch functions at Layer 2?

Answer 37

Address learning, filtering, and loop avoidance

Question 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?

Answer 38

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

Question 39

What is used at Layer 2 to prevent switching loops?

Answer 39

Spanning tree protocol.

Question 40

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

Answer 40

Create a VLAN for contractors and another for guests