Support Essentials 10.9 Flashcards Preview

Mac OS X ACTC recert 10.9 > Support Essentials 10.9 > Flashcards

Flashcards in Support Essentials 10.9 Deck (192)
Loading flashcards...
121

What three ways can you forcibly quit an application from the graphical interface?

The three ways to forcibly quit an application from the graphical interface are from the Force Quit Application dialog accessed from the Apple menu; from the Dock application shortcut menu accessed by Control-clicking or right-clicking the application’s icon; or from the /Applications/Utilities/ Activity Monitor application.

122

What does the diagnostic reporting feature do?

The diagnostic reporting feature automatically creates a diagnostic report log any time an application crashes or hangs. The diagnostic report log can be viewed immediately, reported to Apple via the Internet, or viewed later in the / Applications/Utilities/Console application.

123

Where are application preferences stored?

Application preferences are almost always stored in the user’s Library folder in the ~/Library/Preferences folder. Newer sandboxed applications must always store their preferences in a ~/Library/Containers//Data/Library/ Preferences folder, where “” is the unique bundle identifier for the application.

124

What file format is often used for preference files? How can you view the content of this type of file?

Most application preferences are property lists, which are XML-formatted files that use the “.plist” filename extension. The content of these files can be viewed using Quick Look, and edited using the Xcode development application found on the Mac App Store.

125

What assistive technology features are available in OS X? What system preference enables these features?

The OS X assistive technology features include options to assist users who have difficulty seeing, hearing, using the keyboard, or interacting via keyboard, mouse, or trackpad. These features are available from Accessibility preferences.

126

Where are Dashboard widgets installed when you double- click them? What process or processes are responsible for Dashboard widgets?

When a user double-clicks a Dashboard widget, the system installs the widget to ~/Library/Widgets. The launchd
process starts the Dashboard process on behalf of the currently logged-in user. All open widgets run inside the Dashboard process.

127

What do the terms “interface,” “protocol,” and “service” mean in relation to computer networks?

An interface is any channel through which network data can flow. Hardware network interfaces are defined by physical network connections, and virtual network interfaces are logical network connections that ride on top of hardware network connections.
A protocol is a set of rules used to describe a specific type of network communication. Protocols are necessary for separate network devices to communicate properly. Finally, a network service (as it pertains to Network preferences) is the collection of settings that define a network connection

128

What’s the purpose of Internet Protocol v4 (IPv4) addresses and subnet masks?

The Internet Protocol (IP) address identifies the location of a specific network device. IP addresses are the primary identification used by the Internet protocol suite TCP/IP for both local area and wide area networks. 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.

129

How does IPv4 addressing differ from IPv6 addressing?

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. An IPv6 address is a 128-bit number that’s presented in eight groups of four-digit hexadecimal numbers separated by colons. This allows for a huge range of addresses, and as a result IPv6 addressing essentially includes subnet information.

130

How does the IP use the MAC address to send messages between computers on a local area network (LAN)?

If a network device needs to send data to another network device on the same LAN, it addresses the outgoing packets based on the destination device’s MAC address.

131

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 on the LAN, it’s assumed 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, via a WAN connection, on 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.

132

How is the Domain Name Service (DNS) used to facilitate network naming?

The DNS service is used to translate host names to IP addresses via forward lookups and translate IP addresses to host names via reverse lookups. DNS is architected as a hierarchy of worldwide domain servers. Local DNS servers provide name resolution and possibly host names for local clients. These local DNS servers connect to DNS servers higher in the DNS hierarchy to resolve both unknown host names and host local domain names

133

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.

134

What Wi-Fi authentication protocols are supported by OS X?

OS X supports authenticated Wi-Fi via the following authentication protocols: WEP, WPA/WPA2 Personal, and WPA/ WPA2 Enterprise, which includes support for 802.1X authentication.

135

How can an OS X system automatically connect to a Wi-Fi network?

A new OS X system can only automatically connect to Wi-Fi networks that have no standard authentication mechanism, otherwise known as an “open network.” However, a configured OS X system can automatically reconnect to authenticated Wi-Fi networks, provided that the appropriate information was saved to the Keychain system.

136

Through what mechanism can a standard user configure Wi- Fi settings?

A standard user can connect to any non-WPA Enterprise Wi-Fi network via the Wi-Fi status menu. Because the system Keychain must be modified for WPA Enterprise connections, only an administrative user can establish these types of connections.

137

What’s a network location? Who can access network locations?

A network location is a saved state of Network preferences that contains all network interface settings. Only administrators can define network locations, but if more than one location exists, all users can switch between the various network locations via the Apple menu.

138

What interfaces and protocols are supported by default in OS X?

OS X supports the following network interfaces and protocols:
• Ethernet IEEE 802.3 family of hardware network interface standards
• Wireless (Wi-Fi) IEEE 802.11 family of hardware network interface standards
• FireWire IEEE 1394 bridged network interface
• Thunderbolt bridged network interface
• Bluetooth wireless hardware network interface
• USB connectivity via cellular network adapters or iOS devices with cellular network service
• Virtual private network (VPN) virtual network interface via the Point-to-Point Tunneling Protocol (PPTP)
• VPN virtual network interface via the Layer 2 Tunneling Protocol (L2TP) over Internet Protocol Security (IPSec)
• VPN virtual network interface via Cisco IPSec
• Point-to-Point Protocol over Ethernet (PPPoE) virtual network interface
• 6 to 4 virtual network interface
• Virtual local area network (VLAN) virtual network interface via the IEEE 802.1Q standard
• Link Aggregation virtual network interface via the IEEE 802.3ad standard
• Transmission Control Protocol/Internet Protocol (TCP/IP), also known as the Internet protocol suite
• Dynamic Host Configuration Protocol (DHCP)
• Domain Name Service (DNS) protocol
• Network Basic Input/Output System (NetBIOS) and Windows Internet Naming Service (WINS) protocols
• Authenticated Ethernet via the 802.1X protocol

139

What functionality does OS X support with the AppleTalk protocol?

AppleTalk works only with OS X v10.5 or earlier.

140

How does network service order affect network connectivity?

The network service order list is used to determine the primary network service interface if there is more than one active service. All network traffic that isn’t better handled via local connection to an active network service interface is sent to the primary network service interface. So in most cases all WAN traffic, Internet traffic, and DNS resolution is sent through the primary network service interface.

141

In Network preferences, how can you tell which interface is currently being used for network activities?

In Network preferences, all network service interfaces with a green status indicator are being used for network activities. However, again, all network traffic that isn’t better handled via a local connection is sent to the primary network service interface. The primary network service interface is the topmost active interface in the listing.

142

What’s the easiest method in OS X to configure VPN settings?

The easiest method to configure VPN settings is to use a configuration profile containing all the relevant VPN setup information.

143

How is 802.1X configured on OS X systems?

In OS X there are two configuration methods for 802.1X. The first method is automatic configuration via the selection of a Wi-Fi network that requires WPA/WPA2 Enterprise authentication. The second method is “semi-automatic” configuration via an 802.1X configuration profile provided by an administrator.

144

What are four common issues that can interrupt network services on a Mac computer?

Four common issues that can interrupt network services on a Mac are:
• Ethernet connectivity issues, which can cause the hardware network interface to become inactive or introduce excessive packet errors
• Wi-Fi connectivity issues caused by the selection of an improper Wi-Fi network or excessive wireless interference
• DHCP service issues, which prevent proper TCP/IP configuration
• DNS service issues, which prevent host name resolution

145

How do network devices acquire and use self-assigned TCP/IP addresses?

If DHCP is specified as the configuration for a TCP/IP connection and no DHCP service is available, the device automatically selects a random IP address in the 169.254.xxx.xxx range. It checks the local network to ensure that no other network device is using the randomly generated IP address before it applies the IP address. In most cases, though, this addressing isn’t normal, and it’s often indicative of a problem with DHCP services.

146

How can you identify the MAC addresses for all the Mac computer’s network interfaces?

You can identify all the MAC addresses for the Mac computer’s network interfaces from the Info pane of Network Utility.

147

How can you verify basic connectivity to another network host?

The Ping tab of Network Utility allows you to test basic connectivity to another network host by sending and then waiting for the return of a ping packet.

148

How can you verify that DNS host name resolution is working?

The Lookup tab of Network Utility allows you to test name resolution against the currently configured DNS server.

149

How can you verify that the system can establish a connection to a remote network host?

The Traceroute tab of Network Utility allows you to verify the connection hops between your Mac and a remote host.

150

What’s the relationship between clients and servers as it relates to network service access?

Client software is used to access network services provided by server software. The connection is established using a common network protocol known by both the client and server software. Thus, the client and server software can be from different sources.