Addressing
In TCP/IP version 4, 32 bits that include a series of ones followed by zeroes—for example, 11111111.11111111.11110000.0000 0000, which can be written as 255.255.240.0. The 1s identify the network portion of an IP address, and the 0s identify the host portion of an IP address. The subnet mask tells Windows if a remote computer is on the same or different network.
What is subnet mask
A type of DNS record in the DNS namespace that points a host name to its IP address.
What is A record (address record)
An expansion card that plugs into a computer’s motherboard and provides a port on the back of the card to connect a computer to a network. Also called a network adapter.
What is network interface card (NIC)
A protocol and application that encrypts communication between a client and server and is used to pass login information to a remote Linux computer and control that computer over a network.
What is Secure Shell (SSH)
An application where a client program installed on one computer requests information from a server program installed on another computer on the network or Internet.
What is client/server applications
In TCP/IP version 4, an IP address in the address range 169.254.x.y; used by a computer when it cannot successfully lease an IP address from a DHCP server.
What is Automatic Private IP Address (APIPA)
A TXT record in the DNS namespace used to authenticate that an email message came from a trusted source. A domain name identifier is attached to the record.
What is DKIM (DomainKeys Identified Mail) records
A device used to connect nodes on a network in a star network topology. When it receives a packet, it uses its table of MAC addresses to decide where to send the packet.
What is Switch
The Windows protocol used by Remote Desktop and Remote Assistance utilities to connect to and control a remote computer.
What is Remote Desktop Protocol (RDP)
The HTTP protocol working with a security protocol such as Secure Sockets Layer (SSL) or Transport Layer Security (TLS) to create a secured socket that includes data encryption. TLS is better than SSL.
What is HTTPS (HTTP secure)
A technique that substitutes the public IP address of the router for the private IP address of a computer on a private network when the computer needs to communicate on the Internet.
What is NAT (Network Address Translation)
A TXT record in the DNS namespace that is used to tell a recipient’s mail server what to do when it receives a fraudulent email message. DMARC is designed to work with DKIM and SPF TXT records in the DNS namespace.
What is DMARC (domain-based Message Authentication, Reporting, and Conformance) records
Hardware and/or software that blocks unwanted Internet traffic from a private network and can restrict Internet access for local computers.
What is firewall
A versatile TCP/IP protocol used to monitor network traffic and manage network devices. The SNMP server works with SNMP agents installed on devices being monitored.
What is Simple Network Management Protocol (SNMP)
A TCP/IP protocol used by an email server and client that allows the client to manage email stored on the server without downloading the email. Compare with POP3.
What is IMAP (Internet Mail Access Protocol)