Chapter 3 - Fundamentals Of Lans

Front 1

The term networking model, or networking architecture, refers to an organized set of _________.

Back 1

Documents

Front 2

The term LAN refers to a set of Layer ____ standards for implementing geographically small networks.

Back 2

1 and 2

Front 3

Maximum cable length for 1000BASE-LX

Back 3

5km

Front 4

Maximum cable length for 1000BASE-SX

Back 4

550m

Front 5

Maximum cable length for 10BASE-T

Back 5

100m

Front 6

Maximum cable length for 100BASE-TX

Back 6

100m

Front 7

100BASE-TX refers to

Back 7

Fast Ethernet

Front 8

What is the corresponding IEEE specification for 100BASE-TX

Back 8

802.3u

Front 9

What does the T in 10BASE-T, 100BASE-TX, and 1000BASE-T mean

Back 9

twisted pair

Front 10

What is attenuation

Back 10

When an electrical signal gets weaker over a long length of cable

Front 11

Does a repeater amplify a signal?

Back 11

No, it reads 1's and 0's and generates a new signal to avoid repeating noise.

Front 12

IEEE 802.3 defines what

Back 12

MAC sublayer

Front 13

IEEE 802.2 defines what

Back 13

LLC sublayer

Front 14

10BASE-T is defined by which IEEE standard?

Back 14

802.3

Front 15

100BASE-TX is defined by which IEEE standard?

Back 15

802.3u

Front 16

1000BASE-LX and 1000BASE-SX are defined by which IEEE standard?

Back 16

802.3z

Front 17

1000BASE-T is defined by which IEEE standard?

Back 17

802.3ab

Front 18

Which is more focused on physical standards? 802.3 or 802.2

Back 18

802.3

Front 19

Maximum length of 10BASE5 cable?

Back 19

500m

Front 20

Maximum length of 10BASE2 cable?

Back 20

185m

Front 21

Hubs fixed the problem of _____ but not the problem of _____.

Back 21

Fixed the problem of one break in the cable causing the entire network to fail.

Did not fix the problem of collisions due to the devices all being on a single bus.

Front 22

GBIC and SFP are both ?

Back 22

small removable devices that fit into a port or slot in a switch

Front 23

GBIC

Back 23

Gigabit Interface Converter

Front 24

SFP

Back 24

Small-Form Pluggable

Front 25

Networking device using UTP create an _________ using each wire pair, and the use of twisted pairs means that the ________s created by the wires cancel eachother out.

Back 25

electrical circuit

magnetic field

Front 26

TIA

Back 26

Telecommunications Industry Association

Front 27

EIA

Back 27

Electronics Industry Alliance

Front 28

Color coding for pins on UTP cabling is

A. Arbitrarily decided by cable manufacturers
B. Defined by TIA / EIA standards

Back 28

B

Front 29

In UTP cabling, the wire with a given solid color, and the wire with that color striped with white, are ______?

Back 29

Twisted / Paired

*i am fairly sure these terms mean the same thing, need to look into this though

as i understand these wires, though paires, act as a single wire (1-bit wide), and data is only transmitted one way. data is transmitted on both wires though... because they're twisted... but it says the current is supposed to run opposite ways in each one... so that means one's positive and the other's negative? this "direction of current" would have nothing to do with the "direction of data transmission" maybe was confused because of that

Front 30

UTP cabling with 2 pairs of wires is needed for what type/s of Ethernet?

Back 30

10BASE-T and 100BASE-TX

Front 31

UTP cabling with 4 pairs of wires is needed for what type/s of Ethernet?

Back 31

1000BASE-T

Front 32

Ethernet NIC's send on pins _____ and receive on pins ______

Back 32

1 and 2

3 and 6

Front 33

Ethernet hubs and switches send on pins _____ and receive on pins ______

Back 33

3 and 6

1 and 2

Front 34

Devices that transmit on 1,2 and receive on 3,6 include

Back 34

PC NIC's
Routers (!)
Wireless Access Points
Networked Printers

Front 35

Cables connecting Ethernet switches to other switches are often called?

Back 35

Trunks

Front 36

T/F: Gigabit Ethernet transmits and receives on each wire pair simultaneously.

Back 36

True

Front 37

The feature of Cisco switches which corrects for the use of the wrong type of cable (crossover / straight-through) is called?

Back 37

auto-mdix

Front 38

Crossover cable used in Gigabit Ethernet (which cat?) differs from previous crossover cables how?

Back 38

It crosses over all pairs, so the standard crossover plus pins 4,5 are crossed with pins 7,8.

Front 39

A 100-Mbps switch has 100Mbps of bandwidth

a. per port
b. combined for all ports

Back 39

a

Front 40

Describe the meaning of "shared Ethernet" vs "switched Ethernet"

Back 40

shared = bandwidth is shared because devices must take turns because of CSMA/CD

switched = each device has full bandwidth because of the use of Ethernet switches

Front 41

T/F: CSMA/CD forces devices to operate at half-duplex

Back 41

True

Front 42

A switch with 24 100-Mbps devices connected to it allows for a theoretical maximum bandwidth of?

Back 42

2400Mbps

Front 43

A hub with 24 100-Mbps devices connected to it allows for a theoretical maximum bandwidth of?

Back 43

100Mbps

Front 44

Unicast Ethernet addresses identify?

Back 44

a single Ethernet interface

(book says, "a single LAN card")

Front 45

Which portion of the Ethernet address identifies the manufacturer and what is it called and what is its size?

Back 45

first half
OUI (Organizationally Unique Identifier)
3 bytes (24 bits)

Front 46

Broadcast Ethernet addresses identify?

Back 46

all devices on the LAN

Front 47

Multicast Ethernet addresses identify?

Back 47

some subset of devices on the LAN

Front 48

Burned-in address is?

Back 48

The 6-byte address assigned by the vendor making the card. (is there any other address than that assigned by the vendor? Does this differ from a MAC address. The book states, "regardless of whether the BIA is used or another address is configured, many people refer to unicast addresses as either LAN addresses, Ethernet addresses, hardware addresses, physical addresses, or MAC addresses". What other type of address could possibly be configured to identify a single Ethernet device on a LAN?)

Front 49

When sending IP packets, and using the Type / Length field for length, the Ethernet frame has what additional headers?

Back 49

LLC header
SNAP header

Front 50

In a modern Ethernet frame, a value of less than hex 0600 in the Type / Length field means what?

Back 50

The field is used for length, and another field will be included to specify type

Front 51

Where are the LLC and SNAP headers located in an Ethernet frame containing an IP packet?

Back 51

After the 802.3 header (standard Ethernet header), before the Data and Pad field

Front 52

FCS stands for?
and is located where?

Back 52

Frame Check Sequence

located in the Ethernet frame trailer (it is the only field in the Ethernet trailer)

Front 53

Summarize CSMA/CD logic in 2 steps

Back 53

Wait until no devices are sending, in order to start sending a frame.

If a collision occurs, wait a random amount of time and try again.