Lesson 21 Flashcards
Manage Basic Network settings
What is a MAC address?
The media access control (MAC) address is used to identify a physical network interface on a local network.
How are IPv4 addresses constructed?
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 Internet Protocol v4 (IPv4) addresses and subnet masks?
The IP address identifies the location of a network device. Subnet masks are used by network devices 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?
Mojave 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 LAN. If the destination IP address isn’t, it assumes that the destination address is on another network, and the client 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 continues across WAN connections from router to router until the data reaches its destination.
How is the Domain Name System (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, or SSID, is used to identify a Wi-Fi network name and associated configuration.
Which Wi-Fi authentication protocols are supported by macOS Mojave?
WEP, WPA/WPA2 Personal, and WPA/WPA2 Enterprise, which includes support for 802.1X authentication.
How can macOS Mojave 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.” A configured Mac can automatically reconnect to authenticated Wi-Fi networks, if the appropriate information was saved to the Keychain system.
