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Network+ Ports & Protocols > Ports & Protocols > Flashcards

Ports & Protocols Flashcards

1
Q

SSH

Secure Shell

A

22

  • used to administer Linux server remotely
  • uses public key cryptography to authenticate & encrypt network access remotely; passwords cannot be seen in clear text
  • used by cloud providers to authenticate admins; done by providing them with one private key from the pair
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2
Q

DNS

Domain Name Server

A

53

  • has a records of all domains
  • translates URLs into IP addresses and vice versa; this is called reverse lookup
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3
Q

SMTP

Simple Mail Transport Protocol

A

25

- delivers emails to a destinan email server

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4
Q

SFTP

Secure File Transfer

A

22

  • transfers files using SSH
  • SCP (Secure Copy Protocol) is used on many systems
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5
Q

FTP

File Transfer Protocol

A

20, 21

  • legacy file-sharing protocol
  • has 2 modes: active and passive
  • active: control channel listens for request on port 21 on the server while the data channel sends information to client from port 20 on the server to a destination port about 1023
  • passive: control channel listens for request on port 21 on the server while the data channel sends information to client from port above 1023 on the server to a destination port above 1023
  • active modes causes an issue on firewalled networks because the computer is waiting on a incoming request on a different port than a initially communicated on
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6
Q

TFTP

Trivial File Transfer Protocol

A

69

  • provides no security and is simplistic in its operation
  • designed to boot computers over a network using the Preboot Execution Environment (PXE)
  • used to transport software images over a network
  • used to backup and restore configurations on network devices
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7
Q

Telnet

A

23

  • legacy protocol that is slowly being replaced with SSH
  • allows for remote admin of network devices through a text based console
  • has a lack of encryption
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8
Q

DHCP

Dynamic Host Configuration Protocol

A

67, 68

  • provides automatic IP address, subnet masks, DNS, and remote gateways for new devices on the network
  • client sends and receives requests on port 68
  • server sends and receives requests on port 67
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9
Q

HTTP

Hypertext Transfer Protocol

A

80

- when a webpage is requested from the web server, a request is made for the HTML (Hypertext Markup Language) page

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10
Q

HTTPS

Hypertext Transfer Protocol over SSL

A

443

- provides same function as HTTP but also encrypts the data in the process via SSL (Secure Socket Layer)

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11
Q

SNMP

Single Network Management Protocol

A

161

  • used to collect data from servers and network devices (memory, CPU, and bandwidth)
  • data is read from a centralized Network Management System (NMS)
  • NMS organizes data into a graph
  • can be used in a trap configuration (when device goes over certain threshold, this agent send a trap message to the NMS)
  • these messages can be sent out to help reconfigure network equipment
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12
Q

RDP

Remote Desktop Protocol

A

3389

- used for connection to a computer or server for remote admin

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13
Q

NTP

Network Time Protocol

A

123

- syncs the time clock on computers across the internet

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14
Q

SIP

Session Initiation Protocol

A

5060, 5061

  • used to setup VoIP calls
  • doesn’t actually transport the media stream, rather it helps set it up
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15
Q

SMB

Server Message Block

A

445

  • common network file and printer sharing protocol used with MS products
  • also known as CIFS (Common Internet File System)
  • supports RDMA (Remote Direct Memory Access)
  • support AES (Advanced Encryption Standard) encryption
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16
Q

POP

Post Office Protocol

A

110

  • legacy protocol that is being replaced with IMAP
  • retrieves emails from the server and downloads it to the clients device
  • issue with this is that the last device to access the server is going to be the only one with the latest email
17
Q

IMAP

Internet Message Access Protocol

A

143

  • allows clients to retrieve and read the emails on the server
  • allows multiple clients to access the email server to make it easier to view emails from anywhere that there is an internet connection simultaneously
18
Q

LDAP

Lightweight Directory Access Protocol

A

389

  • protocol that can search a direction service for objects
  • Microsoft Active Directory is an example
19
Q

LDAPS

Lightweight Directory Access Protocol over SSL

A

636

- works just like LDAP but with an encrypted connection using SSL

20
Q

H.323

A

1720
- functions just like SIP but it encompasses all of the communication technologies so used by VoIP and video conferencing
- four main functions:
> terminal control, which provides endpoint signaling such as the VoIP phone itself
> gateway services that provide transcoding functionality as well as communications with circuit-switched and packet-switched networks
> gatekeeper services that provide admin control (authentication and authorization), bandwidth control, and management of endpoints (aka zone management)
> the multipoint control unit (MCU), which provides conference call capabilities and call control of data, voice, and video for future in-call conferencing

Network+ Ports & Protocols (1 decks)

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