Lesson 21: Manage Basic Network Settings Flashcards
• Describe Transmission Control Protocol/Internet Protocol (TCP/IP) networking concepts. • Configure and monitor network settings. • Connect to a Wi-Fi network.
What is a media access control (MAC) address?
The MAC address is a unique identifier of a physical network interface on a local network.
How are Internet Protocol v4 (IPv4) addresses constructed?
Most common IP addresses and subnet masks share the same IPv4 formatting.
An IPv4 address is a 32-bit number represented in four groups of three-digit numbers, known as octets, separated by periods.
Each octet has a value between 0 and 255.
What’s the purpose of IPv4 addresses and subnet masks?
The IP address identifies the location of a network device.
The IP suite TCP/IP uses IP addresses as the primary identification for both local area networks (LANs) and wide area networks (WANs).
Network devices use subnet masks to identify their local network range and to determine whether outgoing data is destined for a network device on the LAN.
What is the default protocol macOS uses to get an IP address?
macOS uses Dynamic Host Configuration Protocol (DHCP) to automatically acquire preliminary TCP/IP configuration and to assign IPv4 addressing.
How does the IP transfer messages between computers over a wide area network (WAN)?
A network client uses the subnet mask to determine whether the destination IP address is on the local area network (LAN).
If the destination IP address isn’t, the client assumes that the destination address is on another network, and it sends the data to the IP address of the local network router.
The network router then sends the data through a wide area network (WAN) connection to another router that it thinks is closer to the destination.
This process continues across WAN connections from router to router until the data reaches its destination.
How is the DNS used to facilitate network naming?
The DNS is used to resolve a DNS name to the corresponding IP addresses.
What’s used to identify a Wi-Fi network?
A Service Set Identifier (SSID) is used to identify a Wi-Fi network name and associated configuration.
Which Wi-Fi authentication protocols are supported by macOS Catalina?
macOS Catalina supports authenticated Wi-Fi by using the following authentication protocols:
- Wired Equivalent Privacy (WEP)
- Wi-Fi Protected Access (WPA)/WPA2 Personal
- WPA/WPA2 Enterprise, which includes support for 802.1X authentication
How can macOS Catalina automatically connect to a Wi-Fi network?
A new Mac can automatically connect only to Wi-Fi networks that have no standard authentication mechanism, known as an open network.
However, a configured Mac can automatically reconnect to authenticated Wi-Fi networks if the appropriate information was saved to the keychain system.
