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Professor M A+ 220-1101 Course Notes > 2.1 Common Network Ports > Flashcards

2.1 Common Network Ports Flashcards

1
Q

For well-known port numbers, what 2 things need to match?

A

Client and server

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2
Q

What are the port numbers for FTP?

A

tcp/20 (active mode data)
tcp/21 (control)

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3
Q

What does FTP do?

A

Transfers files between systems with full-featured functionality such as List, add, delete, etc

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4
Q

How does FTP authenticate users?

A

With a username and password (some systems use a generic/anonymous login)

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5
Q

What is the port number for SSH?

A

tcp/22

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6
Q

SSH looks and acts just like what?

A

Telnet

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7
Q

What is Telnet’s port number?

A

tcp/23

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8
Q

What does Telnet allow us to do?

A

Allows us to log in to a device remotely using in-the-clear communication (not secure)

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9
Q

What is the port number for SMTP?

A

tcp/25

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10
Q

What is SMTP’s function?

A

Server-to-server email transfer, also used by mobile devices and email clients to send mail

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11
Q

What protocols are used to receive mail?

A

IMAP, POP3

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12
Q

What is DNS’s port number?

A

udp/53

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13
Q

What does DNS do?

A

Converts names to IP addresses

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14
Q

Usually, multiple DNS servers are in production. T or F?

A

True, they are very critical resources

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15
Q

What are the ports for DHCP?

A

udp/67
udp/68

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16
Q

What’s the purpose of DHCP?

A

Automatic configuration of IP address, subnet mask, etc

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17
Q

What does DHCP require?

A

A DHCP server

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18
Q

Where can you find DHCP servers? (3)

A

Its own server, as an appliance, integrated into a SOHO router, etc

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19
Q

How are dynamic IP addresses assigned by DHCP?

A

taken from a pool of IP addresses in real-time

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20
Q

How long do assigned IP addresses last?

A

Each system is given a lease and must renew the IP address at certain intervals

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21
Q

What is DHCP reservation?

A

IP addresses are assigned by MAC address in the DHCP server to help manage addresses from one location

22
Q

HTTP and HTTPS is for communication taking place where?

A

in the browser

23
Q

In the clear HTTP and encrypted HTTPS is supported by which web servers and clients?

A

Nearly all

24
Q

What is the port number for POP3?

A

tcp/110

25
Q

What type of functionality does POP3 have?

A

basic mail transfer functionality

26
Q

What’s the port number for IMAP4?

A

tcp/143

27
Q

Which protocol includes email inbox management from multiple clients?

A

IMAP4

28
Q

What does SMB stand for?

A

Server Message Block

29
Q

What is SMB used for? What clients are supported?

A

protocol used by Windows for file sharing, printer sharing

30
Q

What is SMB also called?

A

CIFS (Common Internet File System)

31
Q

What port numbers does NetBIOS over TCP/IP use?

A

udp/137 (netBIOS name services nbname)
tcp/139 (netBIOS session service nbsession)

32
Q

What does NetBIOS stand for

A

Network Basic Input/Output System

33
Q

What is the port number for NetBIOS-less?

A

tcp/445

34
Q

What is NetBIOS-less communication?

A

Direct SMB communication over TCP without NetBIOS transport

35
Q

What does SNMP stand for?

A

Simple Network Management protocol

36
Q

What does SNMP do?

A

Gathers statistics from network devices and manage them

37
Q

What port does SNMP use for queries?

A

udp/161

38
Q

What port does SNMP use for traps?

A

udp/162

39
Q

How many versions of SNMP are there? Which is the most secure?

A

3 versions

3rd version is the most secure standard, others were in the clear communication

40
Q

What does LDAP stand for?

A

Lightweight Directory Access Protocol

41
Q

What port does LDAP use?

A

tcp/389

42
Q

What does LDAP do?

A

Stores and retrieves information in a network directory (commonly used in Microsoft Active Directory)

43
Q

What port does RDP use?

A

tcp/3389

44
Q

What does RDP allow you to do?

A

Share a desktop from a remote location available on many Windows versions

45
Q

With RDP can you connect to an entire desktop or just an application?

A

Yes

46
Q

What clients are compatible with RDP? 6

A

Windows, macOS, Linux, Unix, iPhone, Android, etc

47
Q

What does NetBIOS name service do?

A

Register, remove, and find Windows services by name

48
Q

What does NetBIOS session service do?

A

Windows-connected oriented data transfer

49
Q

What is an SNMP query?

A

gathers statistics from network devices and allows you to manage them

50
Q

What is an SNMP trap?

A

allows you to receive alerts from network devices

51
Q

What protocol allows you to perform encrypted console access?

A

SSH

Professor M A+ 220-1101 Course Notes (21 decks)

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