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66 notecards = 17 pages (4 cards per page)

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Comptia A+ Ports/Protocols

front 1

FTP Port#

back 1

20/21

front 2

SSH Port#

back 2

22

front 3

TELNET Port#

back 3

23

front 4

SMTP Port#

back 4

25

front 5

DNS Port#

back 5

53

front 6

DHCP Port#

back 6

67/68

front 7

HTTP Port#

back 7

80

front 8

POP3 Port#

back 8

110

front 9

NetBIOS Port#

back 9

137/139

front 10

IMAP Port#

back 10

143

front 11

SNMP Port#

back 11

161

front 12

LDAP Port#

back 12

389

front 13

HTTPS Port#

back 13

443

front 14

SMB Port#

back 14

445

front 15

RDP Port#

back 15

3389

front 16

Purpose of 3389

back 16

  • Allows remote access to a Windows computer.
  • RDP

front 17

Purpose of 445

back 17

  • Allows file and printer sharing over a network (Windows).
  • SMB

front 18

Purpose of 443

back 18

  • Secure version of HTTP using encryption (TLS/SSL).
  • HTTPS

front 19

Purpose of 389

back 19

  • Manages user credentials and directory services.
  • LDAP

front 20

Purpose of 161

back 20

  • Monitors network devices (routers, switches).
  • SNMP

front 21

Purpose of 143

back 21

  • Retrieves emails but keeps them on the server (better than POP3).
  • IMAP

front 22

Purpose of 137/139

back 22

  • Enables communication over a local network for file and printer sharing on Windows systems.
  • NetBIOS

front 23

Purpose of 110

back 23

  • Retrieves emails from a server and downloads into client (deletes from server after download).
  • POP3

front 24

Purpose of 80

back 24

  • Used for browsing websites (unencrypted, not secure).
  • HTTP

front 25

Purpose of 67/68

back 25

  • Automatically assigns IP address info to devices (computers, printers, servers, etc)
  • DHCP

front 26

Purpose of 53

back 26

  • Converts domain names into IP addresses.
  • DNS

front 27

Purpose of 25

back 27

  • Sends emails (not for receiving).
  • SMTP

front 28

Purpose of 22

back 28

  • Securely access remote computers (like Telnet but encrypted).
  • SSH

front 29

Purpose of 20/21

back 29

  • Transfers files between computers.
  • FTP

front 30

Purpose of 23

back 30

  • Remote login and access to a system (NOT SECURE).
  • TelNET

front 31

Protocol for 20/21

back 31

FTP

front 32

Protocol for 22

back 32

SSH

front 33

Protocol for 23

back 33

TELNET

front 34

Protocol for 25

back 34

Simple Mail Transfer Protocol

front 35

Protocol for 53

back 35

DNS

front 36

Protocol for 67/68

back 36

DHCP

front 37

Protocol for 80

back 37

HTTP

front 38

Protocol for 110

back 38

Post Office Protocol v3

front 39

Protocol for 137/139

back 39

NetBIOS

front 40

Protocol for 143

back 40

Internet Message Access Protocol

front 41

Protocol for 161

back 41

Simple Network Management Protocol

front 42

Protocol for 389

back 42

Lightweight Directory Access Protocol

front 43

Protocol for 445

back 43

Server Message Block

front 44

Protocol for 443

back 44

HTTPS

front 45

Protocol for 3389

back 45

Remote Desktop Protocol

front 46

Name TWO 802.11 that only has 5GHz

back 46

802,11 A

802.11 AC

front 47

Name TWO 802.11 that only has 2.4GHz

back 47

802.11 B

802.11 G

front 48

Name TWO 802.11 that has both 2.4 and 5 GHz

back 48

802.11 N

802.11 AX

front 49

Which 802.11 uses (MIMO) multiple antennas for better performance?

back 49

N

front 50

Which 802.11 uses (MU-MIMO) letting multiple devices receive data simultaneously?

back 50

AC

front 51

Which 802.11 uses (OFDMA and BSS) to split Wi-Fi signals and reduce interference from neighboring Wi-Fis?

back 51

AX

front 52

Which 802.11 is backwards compatible with 802.11B?

back 52

G

front 53

Which 802.11 is short range, but has low interference?

back 53

A

front 54

Which 802.11 is most prone to interference?

back 54

B

front 55

  • Which RAID uses striping for enhance performance and parity for redundancy?
  • What is the minimum number of drives required?

back 55

  • RAID 5
  • 3 drives.

front 56

  • Which RAID uses striping for enhancing performance and mirroring for redundancy?
  • What is the minimum number of drives required?

back 56

  • RAID 10
  • 4 drives

front 57

  • Which RAID uses mirroring for redundancy but offers no performance enhancements?
  • What is the minimum number of drives required?

back 57

  • RAID 1
  • 2 drives

front 58

  • Which RAID uses striping for enhancing performance but offers no redundancy?
  • What is the minimum number of drives required?

back 58

  • RAID 0
  • 2 drives

front 59

How many drives can fail and still survive with RAID 1?

back 59

One drive can fail. Because both drives contain mirrored data.

front 60

How many drives can fail and still survive with RAID 0?

back 60

None, if one drive fails all data is lost since data is split between 2 drives.

front 61

How many drives can fail and still survive with RAID 10?

back 61

One drive per pair can fail. If both drives in the same pair fail, all data is lost. So 2 drives can fail as long as one drive is from Pair A, and the other Pair B.

Drive 1 mirrors Drive 2 = Pair A

Drive 3 mirrors Drive 4 = Pair B

front 62

How many drives can fail and still survive with RAID 5?

back 62

One drive can fail. Any two of the three drives have enough clues to reconstruct the data for the failed drive. Parity is just accurate clues that help reconstruct data.

front 63

RAID 10 has 8 drives, 1TB each, how much data can be stored?

back 63

4TB (50%)

front 64

RAID 1 has 2 drives, 1TB each, how much data can be stored?

back 64

1 TB (50%)

front 65

RAID 0 has 2 drives, 1TB each, how much data can be stored?

back 65

2 TB (100%)

front 66

RAID 5 has 6 drives, 1TB each, how much data can be stored?

back 66

4TB. (66% or 2/3rds)