Ch. 6 Building Ethernet LANs With Switches

Question 0

______ separated devices into groups called collision domains, reduced the number of collisions that occurred in the network because the frames inside one collision domain did not collide with frames in another collision domain, increased bandwidth by giving each collision domain its own separate bandwidth with one sender at a time per collision domain

Answer 0

Bridges

Question 1

Ethernet switches receive ethernet frames in one port and then Forward or _____ the frames out one or more other ports

Answer 1

Switch

Question 2

Bridges separated devices into groups called ______ ________

Answer 2

Collision domains

Question 3

CD

Answer 3

Collision domain

Question 4

Bridges created ______ separate 10-baseT networks

Answer 4

2

Question 5

_____ switches received ethernet frames and then make a switching decision either for the frame out some other port or ignore the frame

Answer 5

LAN

Question 6

_____ Perform three actions: deciding when to forward a frame or when to filter the frame based on the destination Mac address, learning Mac addresses by examining the source Mac address of each frame received by the switch, creating a layer 2 loop free environment with other bridges By using spanning tree protocol

Answer 6

Bridges

Question 7

STP

Answer 7

Spanning tree protocol

Question 8

To decide whether to forward a frame a _____ uses a dynamically built a table that lists Mac addresses and outgoing interface

Answer 8

Switch

Question 9

A Mac address table is also called a

Answer 9

Switching table

Question 10

The second main function of a _____ is to learn the Mac addresses and interfaces to put in its address table

Answer 10

Switch

Question 11

Switches build the address table by listening to incoming frames and examining the source _____ address

Answer 11

MAC

Question 12

If a _____ enters the switch and the source Mac address is not on the Mac address table the switch creates an entry in the table

Answer 12

Frame

Question 13

Switches keep a time of each entry in the Mac address table called _____ _____

Answer 13

Inactivity timer

Question 14

when there is no matching entry in the table switches forward the frame out all interfaces using a process called ______

Answer 14

Flooding

Question 15

The third primary feature of LAN switches is loop prevention as implemented by_____

Answer 15

STP (spanning tree protocol)

Question 16

Without _____ any flooded frames would loop indefinite period of time

Answer 16

STP

Question 17

To avoid layer 2 loops all switches need to use STP which causes each interface almost wish to settle into either a _______ or _______ state

Answer 17

Blocking or forwarding

Question 18

When the interface cannot forward or receive data frames it is

Answer 18

Blocking

Question 19

When the interface can send and receive data frames it is

Answer 19

Forwarding

Question 20

____ _____ ______ _____ requires the switch to receive the entire frame before forwarding the first bit of the front

Answer 20

Store and forward processing

Question 21

____ _____ and ______ ______ processing methods allow the switch to start forwarding the frame before the entire frame has been received

Answer 21

Cut through and fragment free

Question 22

With ____ _____ processing the switch start sending the frame out the output port as soon as possible

Answer 22

Cut through

Question 23

Cut through does not allow time for the ____

Answer 23

FCS (frame check sequence)

Question 24

_____ ______ processing works similar to cut through but it tries to reduce the number of error frames that it forwards

Answer 24

Fragment free

Question 25

_____ ______ processing works like Cut through processing but it waits to receive the first 64 bytes before forwarding the frame

Answer 25

Fragment free

Question 26

Today switches primary use the _____ ____ ______ processing method

Answer 26

Store and forward

Question 27

____ switches provide the following benefits: switch ports connected to a single device microsegment the LAN providing dedicated bandwidth to that single device and switches allow multiple simultaneous conversations between devices on different ports

Answer 27

LAN

Question 28

____ _____ means that devices that use different ethernet speeds can communicate through the switch (hubs cannot)

Answer 28

Rate adaptation

Question 29

VLAN

Answer 29

Virtual local area network

Question 30

The term ____ _____ referred to an ethernet concept of all ports whose transmitted frames would cause a collision with frames sent by other devices in the collision domain

Answer 30

Collision domain

Question 31

An Ethernet _____ _____ is the set of devices to which the broadcast is delivered when sent from a single device

Answer 31

Broadcast domain

Question 32

Only _____ separate the lan into multiple broadcast domains

Answer 32

Routers

Question 33

A ______ ______ is a set of network interface cards for which a frame sent by one NIC could result in a collision with a frame sent by any other NIC in the same collision domain

Answer 33

Collision domain

Question 34

A ______ _____ is a set of NICs for which a broadcast frame sent by one NICs is received by all other NICs in the same broadcast domain

Answer 34

Broadcast domain

Question 35

A _____ consists of all devices in the same broadcast domain

Answer 35

LAN

Question 36

A _____ uses switch group interfaces to create different broadcast domains based on configuration

Answer 36

VLAN

Question 37

You can create multiple broadcast domains using a single_____

Answer 37

Switch

Question 38

The term _____ LAN refers to the LAN created to support larger buildings or multiple building somewhere in close proximity to one another

Answer 38

Campus

Question 39

Cisco uses three terms to describe the role of each switch and the campus design ____ _____ and _____

Answer 39

Access, distribution, and core

Question 40

_____ switches connect directly to end-users providing user device access to the LAN

Answer 40

Access

Question 41

In larger campus LANs _______ switches provide a path through which the access switches can for traffic to each other

Answer 41

Distribution

Question 42

_____ aggregates distributions switches in a very large campus LANs providing for very high forwarding rates

Answer 42

Core

Question 43

The three most common types of ethernet today are:

Answer 43

10base-t 100base-t 1000base-t

Question 44

_______ Defines the protocol that lets two UTP-based ethernet nodes on the link to negotiate so that they can choose to use the same speed and duplex settings

Answer 44

Autonegotiation

Question 45

Cisco devices using autonegotiation rely on two pieces of logic to determine network standards

Answer 45

Speed and duplex

Question 46

Sense the speed, if that's fails use IEEE default which is the slowest supported speed (often 10 MB per second)

Answer 46

Speed

Question 47

Use the IEEE defaults. If the speed equals 10 or 100 use half duplex otherwise use full-duplex

Answer 47

Duplex

Question 48

LAN ____ impact how autonegotiation works, resulting in the IEEE default setting 10 Mbps and half duplex

Answer 48

Hubs

Question 49

How does a switch decide to forward a frame destined for a known unicast MAC address

Answer 49

It compares the unicast source address to the bridging or Mac address table

Question 50

A LAN switch decides to forward a frame destined for a broadcast MAC address by

Answer 50

Forwarding the frame out all interfaces in the same VLAN except for the incoming interface

Question 51

A switch with the frame Destined for an unknown unicast address

Answer 51

Forwards out all interfaces in the same VLAN except for the incoming interface

Question 52

What comparison does a switch make when deciding whether a new Mac address should be added to its Mac address table

Answer 52

It compares the unicast source address to the bridging or Mac address table

Question 53

Which of the following devices would be in the same collision domain as PC1 PC2 separated from PC1 by an ethernet hub PC3 which is separated from PC1 by a transparent bridge PC4 separated from PC1 by an ethernet switch PC5 which is separated from PC1 buy a router

Answer 53

PC2 which is separate from PC1 by an ethernet hub

Question 54

Which of the following devices would be in the same broadcast Domain as PC1 (choose three) PC2 which is separated from PC1 by an Ethernet hub PC3 which is separated from PC1 by a transparent bridge PC4 which is separated from PC1 by an ethernet switch PC5 which is separated from PC1 Bya router

Answer 54

PC 2 PC 3 PC 4

Question 55

``` Which of the following ethernet standard supports maximum cable length of longer than 100 m (choose two answers) 100base-t 1000base-lx 1000base-t 1000base-fx ```

Answer 55

1000base-lx | 1000base-fx

Question 56

A Cisco LAN switch connects three PCs (PC1 PC2 and PC3) Each directly using a cable that supports ethernet UTP speeds up through 1000 Mbps (1gps). PC1 uses a NIC that supports only 10base-t, while PC2 has a 10/100 NIC, and PC3 has a 10/100/1000 NIC. Assuming that the PCs and switch use IEEE autonegotiation which PCs will use half duplex

Answer 56

None of the PCs will use half duplex