Networking Protocols

Key Terms

• Post Office Protocol 3 (POP3)

  Is used by a mail client to retrieve messages from a mail server, bit it requires that the messages be deleted from the server after they have been downloaded.

• IMAP

  It allows a mail server to keep a copy of a user’s messages on the server after they are downloaded to the mail client.

• SMTP

  It allows a user to send email to a server, but it can’t be used to retrieve messages from the server.

• SSID (Service Set Identification)

  Wireless devices use the SSID to identify the network name. All devices on a wireless network use the same SSID.

• HTTPS

  It encrypts and transfers hypertext pages over the internet. HTTPS is combined with HTTP with SSL.

• HTTP

  It’s used to identify resources and transfer hypertext pages on the World Wide Web.

• TCP/IP

  It verifies that each packet has been transmitted and received correctly and re-transmits packets that become lost or corrupted.

• UDP

  It transmits packets in a continuous stream but doesn’t verify whether packets are received correctly.

• DNS

  It matches unique IP address with easy-to-read URLs.

• SSL

  It encrypts data so unauthorized parties can’t understand the data even if they manage to intercept it.

• NTP

  It’s a protocol that synchronizes the clocks of all computers on a network.

• WPA (Wi-Fi Protected Access)/ WEP (Wired Equivalent Privacy)

  They are security protocols that govern how data in a wireless network is secured by encryption.

• DHCP

  It’s a network server that uses DHCP to assign IP addresses and subnet masks. If a network did not have a DHCP server, the network administrator would have to manually set up every client who wanted to join the network (also known as static IP addresses). This would be cumbersome and inefficient process, especially if he or she were dealing with a large network. It is vital that every computer on a network have a unique IP address so that conflicts do not arise, ad so utilizing DHCP is incredibly important in a network setting.

• Internet Service Providers (ISPs)

  Helps manage an access point to the internet and charge customers for that access.

• World Wide Web

  The digital content that is delivered over the internet, usually through a web browser.

• Email Filtering

  Is used to be implemented by each user, it can also be enabled in incoming mail servers to reduce spam and other unwanted email by blocking email based on the sender address or by content.

• Antivirus Software

  It can protect against computer viruses found in an email but it not used to filter email content.

• Firewalls

  They are placed between the company network and the internet to filter network traffic at the IP level. Normally, they do not filter email based on content.

• Multi factor Authentication

  It combines a strong password with at least one other form of authentication before granting access.