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Comptia A+ Ports/Protocols

1.

FTP Port#

20/21

2.

SSH Port#

22

3.

TELNET Port#

23

4.

SMTP Port#

25

5.

DNS Port#

53

6.

DHCP Port#

67/68

7.

HTTP Port#

80

8.

POP3 Port#

110

9.

NetBIOS Port#

137/139

10.

IMAP Port#

143

11.

SNMP Port#

161

12.

LDAP Port#

389

13.

HTTPS Port#

443

14.

SMB Port#

445

15.

RDP Port#

3389

16.

Purpose of 3389

  • Allows remote access to a Windows computer.
  • RDP
17.

Purpose of 445

  • Allows file and printer sharing over a network (Windows).
  • SMB
18.

Purpose of 443

  • Secure version of HTTP using encryption (TLS/SSL).
  • HTTPS
19.

Purpose of 389

  • Manages user credentials and directory services.
  • LDAP
20.

Purpose of 161

  • Monitors network devices (routers, switches).
  • SNMP
21.

Purpose of 143

  • Retrieves emails but keeps them on the server (better than POP3).
  • IMAP
22.

Purpose of 137/139

  • Enables communication over a local network for file and printer sharing on Windows systems.
  • NetBIOS
23.

Purpose of 110

  • Retrieves emails from a server and downloads into client (deletes from server after download).
  • POP3
24.

Purpose of 80

  • Used for browsing websites (unencrypted, not secure).
  • HTTP
25.

Purpose of 67/68

  • Automatically assigns IP address info to devices (computers, printers, servers, etc)
  • DHCP
26.

Purpose of 53

  • Converts domain names into IP addresses.
  • DNS
27.

Purpose of 25

  • Sends emails (not for receiving).
  • SMTP
28.

Purpose of 22

  • Securely access remote computers (like Telnet but encrypted).
  • SSH
29.

Purpose of 20/21

  • Transfers files between computers.
  • FTP
30.

Purpose of 23

  • Remote login and access to a system (NOT SECURE).
  • TelNET
31.

Protocol for 20/21

FTP

32.

Protocol for 22

SSH

33.

Protocol for 23

TELNET

34.

Protocol for 25

Simple Mail Transfer Protocol

35.

Protocol for 53

DNS

36.

Protocol for 67/68

DHCP

37.

Protocol for 80

HTTP

38.

Protocol for 110

Post Office Protocol v3

39.

Protocol for 137/139

NetBIOS

40.

Protocol for 143

Internet Message Access Protocol

41.

Protocol for 161

Simple Network Management Protocol

42.

Protocol for 389

Lightweight Directory Access Protocol

43.

Protocol for 445

Server Message Block

44.

Protocol for 443

HTTPS

45.

Protocol for 3389

Remote Desktop Protocol

46.

Name TWO 802.11 that only has 5GHz

802,11 A

802.11 AC

47.

Name TWO 802.11 that only has 2.4GHz

802.11 B

802.11 G

48.

Name TWO 802.11 that has both 2.4 and 5 GHz

802.11 N

802.11 AX

49.

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

N

50.

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

AC

51.

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

AX

52.

Which 802.11 is backwards compatible with 802.11B?

G

53.

Which 802.11 is short range, but has low interference?

A

54.

Which 802.11 is most prone to interference?

B

55.
  • Which RAID uses striping for enhance performance and parity for redundancy?
  • What is the minimum number of drives required?
  • RAID 5
  • 3 drives.
56.
  • Which RAID uses striping for enhancing performance and mirroring for redundancy?
  • What is the minimum number of drives required?
  • RAID 10
  • 4 drives
57.
  • Which RAID uses mirroring for redundancy but offers no performance enhancements?
  • What is the minimum number of drives required?
  • RAID 1
  • 2 drives
58.
  • Which RAID uses striping for enhancing performance but offers no redundancy?
  • What is the minimum number of drives required?
  • RAID 0
  • 2 drives
59.

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

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

60.

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

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

61.

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

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

62.

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

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.

63.

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

4TB (50%)

64.

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

1 TB (50%)

65.

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

2 TB (100%)

66.

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

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