Chapter 2 Flashcards - Sheet 1 Preview

CCNA 100-101 > Chapter 2 Flashcards - Sheet 1 > Flashcards

Flashcards in Chapter 2 Flashcards - Sheet 1 Deck (65):
1

2 types of LANs

Ethernet LANs, Wireless LANs

2

Ethernet

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

3

Ethernet IEEE numbers

802.3

4

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

10mbps/Ethernet/802.3/Copper/100 meters

5

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

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

6

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

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

7

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

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

8

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

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

9

Twisted pairs are twisted to cut out

EMI - Electromagnetic interference

10

Number of twisted pairs: 100BaseT

2 pairs of wires

11

Number of twisted pairs: 10BaseT

2 pairs of wires

12

Number of twisted pairs: 1000BaseT

4 pairs of wires

13

Number of pin positions in an RJ-45 cable

8

14

GBIC

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

15

SFP

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

16

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

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

17

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

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

18

Pinout

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

19

Straight-Through Cable Pinout for 10BaseT and 100BaseT

Pin 1 to 1, 2 to 2, etc

20

Crossover Cable Pinout for 10BaseT and 100BaseT

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

21

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

PC NICs, Routers, WAPs (Ethernet interface)

22

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

Hubs, Switches

23

Auto-mdix

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)

24

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

1000BaseT

25

Straight-Through Cable Pinout for 1000BaseT

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

26

Crossover Cable Pinout for 1000BaseT

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

27

List the fields of the ethernet frame

Preamble, start frame delimiter, Destination, Source, Type

28

Ethernet header, length of preamble

7 bytes

29

Ethernet header, length of Start Frame Delimiter

1 bytes

30

Ethernet header, length of Destimation MAC address

6 bytes

31

Ethernet header, length of Source MAC address

6 bytes

32

Ethernet header, length of Type

2 bytes

33

Ethernet data and pad - length

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

34

Ethernet trailer - Frame Check Sequence length

4 bytes

35

Purchase of the ethernet frame field: preamble

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

36

Purchase of the ethernet frame field: Start Frame Delimiter

Signifies that the next byte begins the destination MAC address field

37

Purchase of the ethernet frame field: Destination MAC address

Identifies the intended recipient of the frame

38

Purchase of the ethernet frame field: Source MAC address

Identifies the sender of the frame

39

Purchase of the ethernet frame field: Type

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

40

Purchase of the ethernet frame field: Data and Pad

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

41

Purchase of the ethernet frame field: Frame Check Sequence

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

42

Ethernet Addresses

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.

43

Unicast Ethernet Address

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

44

OUI

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

45

Other terms for Ethernet Address

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

46

Group Addresses

Ethernet addresses that refer to more than one device

47

Types of Group Addresses

Broadcast Address, Multicast Address

48

Broadcast Address

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

49

Multicast Address

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

50

Name some types of network protocols (L3PDU types)

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

51

Ethernet is a ______ protocol

Data Link

52

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

Full duplex / Half duplex

53

Half-Duplex

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

54

Full-Duplex

No half-duplex restriction

55

Why are hubs half-duplex?

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

56

CSMA/CD

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

57

CSU/DSU

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

58

CPE

Customer Presmises Equipment

59

Examples of CPE:

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

60

Typical connection from a telco to the CSU/DSU

RJ-48

61

DTE Cables

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

62

DTE Cable equivalent of a crossover cable

DCE - Data Communications Equipment Cable

63

Clocking

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

64

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

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

65

All data link protocols perform this similar role

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