Lesson 21—Manage Basic Network Settings Flashcards
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’s the default protocol that 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 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 LAN. If the destination address isn’t local, 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 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 4 Wi-Fi authentication protocols are supported by macOS Big Sur?
- Wired Equivalent Privacy (WEP)
- Wi-Fi Protected Access (WPA)/WPA2 Personal
- WPA/WPA2 Enterprise, which includes support for 802.1X authentication
- WPA3 Personal/WPA3 Enterprise, which includes support for 802.1X authentication
How can macOS Big Sur automatically connect to a Wi-Fi network?
A 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 is saved to the keychain system.
What does macOS Big Sur display when you click the Wi-Fi status menu?
The Wi-Fi network your Mac is currently using (marked by a blue Wi-Fi symbol next to it) as well as any Wi-Fi network in broadcast range that your Mac has previously joined or you have a valid keychain item for. It also displays the option “Other Networks.” If you’re signed in with an Apple ID, the Wi-Fi status menu also displays instant hotspots in range associated with that Apple ID.
