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CompTIA N10-007 Network+ > Common Ports > Flashcards

Flashcards in Common Ports Deck (15)
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1
Q

SSH - Secure Shell

A
  • Encrypted communication link - tcp/22

* Looks and acts the same as Telnet

2
Q

DNS - Domain Name System

A
  • Converts names to IP addresses - udp/53
    • www.professormesser.com = 162.159.246.164
  • These are very critical resources
    • Usually multiple DNS servers are in production
3
Q

SMTP - Simple Mail Transfer Protocol

A
  • SMTP - Simple Mail Transfer Protocol
    • Server to server email transfer - tcp/25

• Also used to send mail from a device to a mail server
• Commonly configured on mobile devices
and email clients

  • Other protocols are used for clients to receive email
    • IMAP, POP3
4
Q

SFTP - Secure FTP

A

• Uses the SSH File Transfer Protocol - tcp/22

• Provides file system functionality
• Resuming interrupted transfers, directory listings,
remote file removal

5
Q

File Transfer Protocols

A
  • FTP – File Transfer Protocol
    • tcp/20 (active mode data), tcp/21 (control)
    • Transfers files between systems
    • Authenticates with a username and password
    • Full-featured functionality (list, add, delete, etc.)
  • TFTP – Trivial File Transfer Protocol
    • udp/69
    • Very simple file transfer application
    • Read files and write files
    • No authentication - Not used on production systems
6
Q

Telnet

A
  • Telnet – Telecommunication Network - tcp/23
  • Login to devices remotely
  • Console access
  • In-the-clear communication
  • Not the best choice for production systems
7
Q

DHCP - Dynamic Host Configuration Protocol

A

• Automated configuration of IP address,
subnet mask and other options
• udp/67, udp/68 - Requires a DHCP server

  • Dynamic / pooled
    • IP addresses are assigned in real-time from a pool
    • Each system is given a lease
    • Must renew at set intervals
  • Reserved
    • Addresses are assigned by MAC address
    • Quickly manage addresses from one location
8
Q

SNMP - Simple Network Management Protocol

A
  • Gather statistics from network devices
    • udp/161
  • v1 – The original
    • Structured tables, in-the-clear
  • v2 – A good step ahead
    • Data type enhancements, bulk transfers
    • Still in-the-clear
  • v3 – The new standard
    • Message integrity, authentication, encryption
9
Q

RDP - Remote Desktop Protocol

A

• Share a desktop from a remote location over
tcp/3389
• Remote Desktop Services on many Windows versions
• Can connect to an entire desktop or just an
application
• Clients for Windows, MacOS, Linux, iPhone, and
others

10
Q

NTP - Network Time Protocol

A
  • Switches, routers, firewalls, servers, workstations
    • Every device has its own clock - udp/123
  • Synchronizing the clocks becomes critical
    • Log files, authentication information, outage details
  • Automatic updates
    • No flashing 12:00 lights

• Flexible - You control how clocks are updated

  • Very accurate
    • Accuracy is better than 1 millisecond
11
Q

SIP - Session Initiation Protocol

A
  • Voice over IP (VoIP) signaling
    • tcp/5060 and tcp/5061
  • Setup and manage VoIP sessions
    • Call, ring, hang up

• Extend voice communication
• Video conferencing, instant messaging, file transfer,
etc

12
Q

SMB - Server Message Block

A
  • Protocol used by Microsoft Windows
    • File sharing, printer sharing
    • Also called CIFS (Common Internet File System)

• Direct over tcp/445 (NetBIOS-less)
• Direct SMB communication over TCP
without the NetBIOS transport

13
Q

POP/IMAP

A
  • Receive emails from an email server
    • Authenticate and transfer
  • POP3 - Post office Protocol version 3 - tcp/110
    • Basic mail transfer functionality

• IMAP4 - Internet Message Access Protocol v4
tcp/143
• Manage email inbox from multiple clients

14
Q

LDAP/LDAPS

A

• LDAP (Lightweight Directory Access Protocol) -
tcp/389
• Store and retrieve information in a network directory

  • LDAPS (LDAP Secure) - tcp/636
    • A non-standard implementation of LDAP over SSL
15
Q

H.323

A
  • Voice over IP (VoIP) signaling - tcp/1720
    • ITU Telecommunication H.32x protocol series
  • Setup and manage VoIP sessions
    • Call, ring, hang up
  • One of the earliest VoIP standards
    • Still in use today

Decks in CompTIA N10-007 Network+ Class (86):