Chapter 2 Flashcards - Sheet 1

Question 1

2 types of LANs

Answer 1

Ethernet LANs, Wireless LANs

Question 2

Ethernet

Answer 2

family of LAN standards that define physical and data link layers. Cabling, connectors, protocol rules, etc

Question 3

Ethernet IEEE numbers

Answer 3

802.3

Question 4

Speed/Common Name/IEEE Standard/Cable Type/Max Length: 10BaseT

Answer 4

10mbps/Ethernet/802.3/Copper/100 meters

Question 5

Speed/Common Name/IEEE Standard/Cable Type/Max Length: 100BaseT

Answer 5

100mbps/Fast Ethernet/802.3u/Copper/100 meter

Question 6

Speed/Common Name/IEEE Standard/Cable Type/Max Length: 1000BaseLX

Answer 6

1000mbps/Gigabit Ethernet/802.3z/Fiber/5000 meter

Question 7

Speed/Common Name/IEEE Standard/Cable Type/Max Length: 1000BaseT

Answer 7

1000mbps/Gigabit Ethernet/802.3ab/Copper/100 meter

Question 8

Speed/Common Name/IEEE Standard/Cable Type/Max Length: 10GBBaseT

Answer 8

10gbps/10 Gib Ethernet/802.3an/copper/100 meter

Question 9

Twisted pairs are twisted to cut out

Answer 9

EMI - Electromagnetic interference

Question 10

Number of twisted pairs: 100BaseT

Answer 10

2 pairs of wires

Question 11

Number of twisted pairs: 10BaseT

Answer 11

2 pairs of wires

Question 12

Number of twisted pairs: 1000BaseT

Answer 12

4 pairs of wires

Question 13

Number of pin positions in an RJ-45 cable

Answer 13

8

Question 14

GBIC

Answer 14

Gigabit interface converter. Swapable transceivers, commonly used with Gigabit Ethernet and fibre channel

Question 15

SFP

Answer 15

Small Form Factor Pluggables - Smaller typrs of removable interfaces that give users the ability to swap hardware and change the type of link.

Question 16

Pins used to receive / send data from PC to switch for 10BaseT and 100BaseT

Answer 16

1,2 used to send to switch. 3,6 used to receive from switch

Question 17

Pins used to receive / send data from switch to PC for 10BaseT and 100BaseT

Answer 17

3,6 used to send to PC. 1,2 used to receive from PC.

Question 18

Pinout

Answer 18

Refers to the wiring of which color wire is placed in each of the eight numbered pin positions

Question 19

Straight-Through Cable Pinout for 10BaseT and 100BaseT

Answer 19

Pin 1 to 1, 2 to 2, etc

Question 20

Crossover Cable Pinout for 10BaseT and 100BaseT

Answer 20

1 to 3, 2 to 6 – allows two devices that use the same pinouts to send/receive to still send recieve

Question 21

List devices that use pins 1,2 to send and 3,6 to receive

Answer 21

PC NICs, Routers, WAPs (Ethernet interface)

Question 22

List devices that use pins 3,6 to send and 1,2 to receive

Answer 22

Hubs, Switches

Question 23

Auto-mdix

Answer 23

Feature that notices when the wrong cable type (straight through or crossover) is used and automatically changes its logic to make the link work (Automatic Medium Dependent Interface Crossover)

Question 24

Which ethernet standard allows each end of a cable to send and receive?

Answer 24

1000BaseT

Question 25

Straight-Through Cable Pinout for 1000BaseT

Answer 25

1 to 1, 2 to 2, etc - all the way though to 8

Question 26

Crossover Cable Pinout for 1000BaseT

Answer 26

1 to 3, 2 to 6; 4 to 7, 5 to 8

Question 27

List the fields of the ethernet frame

Answer 27

Preamble, start frame delimiter, Destination, Source, Type

Question 28

Ethernet header, length of preamble

Answer 28

7 bytes

Question 29

Ethernet header, length of Start Frame Delimiter

Answer 29

1 bytes

Question 30

Ethernet header, length of Destimation MAC address

Answer 30

6 bytes

Question 31

Ethernet header, length of Source MAC address

Answer 31

6 bytes

Question 32

Ethernet header, length of Type

Answer 32

2 bytes

Question 33

Ethernet data and pad - length

Answer 33

46-1500 bytes. Varies. Sender adds padding to meet min req if needed.

Question 34

Ethernet trailer - Frame Check Sequence length

Answer 34

4 bytes

Question 35

Purchase of the ethernet frame field: preamble

Answer 35

Synchronization - REcognizable bit pattern so receive nodes realize that a new frame is arriving

Question 36

Purchase of the ethernet frame field: Start Frame Delimiter

Answer 36

Signifies that the next byte begins the destination MAC address field

Question 37

Purchase of the ethernet frame field: Destination MAC address

Answer 37

Identifies the intended recipient of the frame

Question 38

Purchase of the ethernet frame field: Source MAC address

Answer 38

Identifies the sender of the frame

Question 39

Purchase of the ethernet frame field: Type

Answer 39

Defines the type of protocol listed inside the frame. Likely either IPv4 or IPv6

Question 40

Purchase of the ethernet frame field: Data and Pad

Answer 40

Holds data from the higher layer (Typically L3PDU packets -- Network Layer).

Question 41

Purchase of the ethernet frame field: Frame Check Sequence

Answer 41

Provides a method for receiving NIC to determine whether the frame experienced transmission errors

Question 42

Ethernet Addresses

Answer 42

AKA MAC (Media Access Control) Addresses. 6 byte (48 bit) hardware address. Usually binary, though PCs list them for humans in a 12 digit hexadecimal figure.

Question 43

Unicast Ethernet Address

Answer 43

A MAC address that represents a single NIC or Ethernet port. This accounts for most Ethernet Addresses.

Question 44

OUI

Answer 44

Organizationally Unique Identifier - 3 bytes of the 6 byte Ethernet Address that IEEE assigns to manufacturers

Question 45

Other terms for Ethernet Address

Answer 45

LAN Address, Ethernet Address, Hardware Address, Burned In Address, Physical Address, Universal Address, MAC Address

Question 46

Group Addresses

Answer 46

Ethernet addresses that refer to more than one device

Question 47

Types of Group Addresses

Answer 47

Broadcast Address, Multicast Address

Question 48

Broadcast Address

Answer 48

Frames sent to this address should be delivered to all devices on the ethernet LAN. Value: FFFF.FFFF.FFFF

Question 49

Multicast Address

Answer 49

Frames sent will be copied and forwarded to a subset of the devices on the LAN that volunteers to receive frames sent to a specific multicast address

Question 50

Name some types of network protocols (L3PDU types)

Answer 50

IPv4, IPv6, AppleTalk, IBM's SNA, Novell NetWare, DECnet

Question 51

Ethernet is a ______ protocol

Answer 51

Data Link

Question 52

Switches can run at ____ while hubs can only run at _____

Answer 52

Full duplex / Half duplex

Question 53

Half-Duplex

Answer 53

Locigic in which a port sends data only when it is not also receiving data. Cannot send and receive at the same time

Question 54

Full-Duplex

Answer 54

No half-duplex restriction

Question 55

Why are hubs half-duplex?

Answer 55

Hubs are layer 1 devices & resend all bits across all ports. To prevent collissions, they must not send and receive at one time.

Question 56

CSMA/CD

Answer 56

Carrier sense multiple access with collission detection - Used by half-duplex devices to prevent / recover from collissions

Question 57

CSU/DSU

Answer 57

Channel Service Unit / Data Service Unit (Modem / Connection equipment to a WAN)

Question 58

CPE

Answer 58

Customer Presmises Equipment

Question 59

Examples of CPE:

Answer 59

Router, serial interface card, CSU/DSU. The CSU/DSU may be integrated into the serial interface card in the router.

Question 60

Typical connection from a telco to the CSU/DSU

Answer 60

RJ-48

Question 61

DTE Cables

Answer 61

Data terminal equipment cables. Serial cables normally used between a router and an external CSU/DSU

Question 62

DTE Cable equivalent of a crossover cable

Answer 62

DCE - Data Communications Equipment Cable

Question 63

Clocking

Answer 63

Function of the CSU/DSU that tells the router when to send each bit through signaling over a serial cable.

Question 64

Two most popular data link layer protocols used for leased lines (WANs) are

Answer 64

HDLC (High Level Data Link Control) and PPP (Point to Point Protocol)

Question 65

All data link protocols perform this similar role

Answer 65

Control correct delivery of data over a physical link of a particular type.