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ISDN1 > Ch. 6 Building Ethernet LANs With Switches > Flashcards

Ch. 6 Building Ethernet LANs With Switches Flashcards

0
Q

______ 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

A

Bridges

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1
Q

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

A

Switch

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2
Q

Bridges separated devices into groups called ______ ________

A

Collision domains

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3
Q

CD

A

Collision domain

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4
Q

Bridges created ______ separate 10-baseT networks

A

2

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5
Q

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

A

LAN

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6
Q

_____ 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

A

Bridges

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7
Q

STP

A

Spanning tree protocol

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8
Q

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

A

Switch

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9
Q

A Mac address table is also called a

A

Switching table

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10
Q

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

A

Switch

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11
Q

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

A

MAC

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12
Q

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

A

Frame

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13
Q

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

A

Inactivity timer

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14
Q

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

A

Flooding

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15
Q

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

A

STP (spanning tree protocol)

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16
Q

Without _____ any flooded frames would loop indefinite period of time

A

STP

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17
Q

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

A

Blocking or forwarding

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18
Q

When the interface cannot forward or receive data frames it is

A

Blocking

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19
Q

When the interface can send and receive data frames it is

A

Forwarding

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20
Q

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

A

Store and forward processing

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21
Q

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

A

Cut through and fragment free

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22
Q

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

A

Cut through

23
Q

Cut through does not allow time for the ____

A

FCS (frame check sequence)

24
Q

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

A

Fragment free

25
Q

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

A

Fragment free

26
Q

Today switches primary use the _____ ____ ______ processing method

A

Store and forward

27
Q

____ 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

A

LAN

28
Q

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

A

Rate adaptation

29
Q

VLAN

A

Virtual local area network

30
Q

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

A

Collision domain

31
Q

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

A

Broadcast domain

32
Q

Only _____ separate the lan into multiple broadcast domains

A

Routers

33
Q

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

A

Collision domain

34
Q

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

A

Broadcast domain

35
Q

A _____ consists of all devices in the same broadcast domain

A

LAN

36
Q

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

A

VLAN

37
Q

You can create multiple broadcast domains using a single_____

A

Switch

38
Q

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

A

Campus

39
Q

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

A

Access, distribution, and core

40
Q

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

A

Access

41
Q

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

A

Distribution

42
Q

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

A

Core

43
Q

The three most common types of ethernet today are:

A

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

44
Q

_______ 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

A

Autonegotiation

45
Q

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

A

Speed and duplex

46
Q

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

A

Speed

47
Q

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

A

Duplex

48
Q

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

A

Hubs

49
Q

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

A

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

50
Q

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

A

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

51
Q

A switch with the frame Destined for an unknown unicast address

A

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

52
Q

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

A

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

53
Q

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

A

PC2 which is separate from PC1 by an ethernet hub

54
Q

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

A

PC 2
PC 3
PC 4

55
Q 
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
A

1000base-lx

1000base-fx

56
Q

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

A

None of the PCs will use half duplex

ISDN1 (28 decks)

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